What is high-efficiency continuous casting?

 High-efficiency continuous casting is usually defined as five highs: that is, the entire continuous casting billet production process is high-speed, high-quality, high-efficiency, high-operating rate, and high-temperature billet. In addition, high automatic control is also on the agenda. At present, the domestic high-efficiency continuous casting of billet (take 150 cubic meters as an example) should be at the level of a single-strand annual output of 150,000 to 200,000 tons of qualified plain carbon steel casting slabs, and slabs should be between 1 million to 1.5 million tons of qualified casting The level of the billet. The cost per ton of billet is also decreasing year by year. The automatic control level of the continuous casting machine is also improving year by year.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:What is high-efficiency continuous casting?
Company name: Henan Changxing Refractory Materials Co.,Ltd
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How to choose insulation brick

 

The principles of choosing insulation bricks include:

1) It should not affect the service life of the entire refractory masonry;

2) For continuous working high-temperature furnaces, generally large-area heat preservation is reasonable, which can reduce heat loss. However, for some special areas, such as open hearth roofs, insulation can reduce service life. For periodic working furnaces, regenerative heat loss is the main factor of heat loss. Insulation can increase the temperature of the masonry and increase the regenerative heat loss. Therefore, whether the regular working furnace should be insulated shall be determined after calculating the heat storage and heat loss.

3) Due to the high porosity of insulating bricks, they cannot bear excessive load and should not directly contact molten metal, slag and high-temperature dust.

4) Insulation bricks have low strength. Brick joints and expansion joints should be properly handled to avoid damage caused by volume expansion. Insulation refractory bricks should not be subjected to strong mechanical vibration, impact and friction;

5) Since the thermal insulation brick has a large linear shrinkage after reheating, the maximum working temperature should be less than 100℃ than the firing temperature.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality mullite insulating bricks are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:How to choose insulation brick
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Method for online replacement of furnace mouth flange of converter

 

Method for online replacement of furnace mouth flange of converter

1. Cut and separate the ribs on the outer flange of the old furnace mouth from the upper shell of the converter body and the outer flange of the old furnace mouth and the upper shell of the shell
2. Clean the cutting port on the upper section of the converter shell to obtain the docking port on the upper section of the converter shell.
3. Make sure that the docking port is facing vertically upwards, and a aligning tool is set in the inner hole of the new furnace mouth flange. The center axis of the aligning tool coincides with the center axis of the new furnace mouth flange.
4. Place the new furnace mouth flange on the docking port.
5. Hang the line hammer from the center of the furnace oxygen gun, adjust the top end face of the new furnace mouth flange to be perpendicular to the line hammer's down direction, and the center axis of the alignment tooling is coaxial with the center of the line hammer.
6. Weld the bottom end face of the new furnace mouth flange to the docking port and rib.
This method can solve the problems of large workload and high replacement cost of replacing the furnace mouth flange by replacing the entire converter.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Method for online replacement of furnace mouth flange of converter
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Advantages of dry vibrating material in tundish

 Tundish dry vibrating materials are mainly used for tundish linings, and are the third generation of high-tech products after insulation panels and tundish coatings. Magnesium materials have good resistance to corrosion by high-speed iron and high-alkaline slag, and have the characteristics of long service life and no pollution to molten steel.

The dry vibrating mix has good construction performance, high low-temperature demolding strength and high medium and high temperature strength, which can meet the requirements of customers for low temperature baking and medium and high temperature use of dry material working lining in tundish.

Advantages of dry material construction:

(1) The construction process is convenient and fast

(2) Reduced labor intensity

(3) Improved construction environment

(4) No dust, no irritating gas, no pollution to the environment

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality tundish dry vibrating mix are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Advantages of dry vibrating material in tundish
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4 main reasons for the damage of the converter taphole

 1. Oxidation of furnace gas

The tapping hole is under a high temperature oxidizing atmosphere. The furnace gas produced during the blowing process contains a large amount of CO, and a CO reaction occurs when it is discharged from the tapping hole brick. On the inner wall of the tapping hole, the decarburized layer is formed on the surface, which directly causes damage to the steel tap.

2. Friction damage of steel and slag and mechanical erosion
When tapping, the taphole should withstand the huge pressure of the molten steel in the converter. At the same time, when the molten steel and slag flow out of the taphole, friction and scouring occur with the inner wall of the taphole.

3. High temperature melting of molten steel and slag
Under the action of high temperature molten steel, the material of the tapping hole brick will soften, causing damage to the taphole.

4. Chemical corrosion of molten steel and slag
Molten steel generally has strong oxidizing properties, a chemical reaction occurs under high temperature and high oxidizing conditions.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality taphole brick are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:4 main reasons for the damage of the converter taphole
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The essentials for the use of slide gate plate

 

The essentials for the use of slide gate plate:

1. Prevent the occurrence of “slag going through” phenomenon during casting.
2. Pay attention to save the stroke when the continuous casting is controlled and the closing operation is completed.
3. Prevent improper operation of nozzle cleaning which could cause the expansion of the casting hole to be too large.
4. After cleaning the nozzle and removing the scrap of the colletor nozzle, carefully check the erosion of the three joints and the sliding surface of the sliding nozzle from the casting hole while moving the slide gate plate. Stop using when the joint erosion is obvious or the sliding surface is obviously rough.
5. While pushing and pulling the ladle slide gate plate in the whole process, check the matching condition of the sliding surface of the upper and lower slide gate plates from outside the mechanism to determine whether the mechanism and the spring work normally. If there is a gap between the sliding surfaces or the sliding speed of the lower slide gate plate is too fast or too slow, etc., stop using.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality ladle slide gate plate are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:The essentials for the use of slide gate plate
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About construction of refractory bricks

 

Masonry refractory bricks should be designed to avoid the following erroneous operations.

1) Misplacement: brick and brick dislocation
2) Tilt: not parallel to the axial direction
3) Climbing: There is a regular unevenness on the circumferential surface, which should be controlled within 1mm.
4) From the middle: the bricks in the masonry are not the same as the cylinder
5) Zhangkou: small and large inside the gray joint in the annular masonry
6) Empty: Refractory mud is not full between bricks and bricks
7) Snake shape: radial seam, circumferential seam is not straight and wavy
8) Inverted size head
9) Severely missing corners
10) Masonry drum kit: belonging to equipment deformation or cleaning of the inner surface of the cylinder is not clean
11) Hair seam: iron plate exposed or fire mud is not hooked, brick surface is not clean
12) Mixing: Misuse of mud is not allowed

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:About construction of refractory bricks
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Problems existing in waste refractory materials and classified reuse

 At present, China's refractory materials, annual output of waste reached 7 million tons, the amount is very large. The existence of these waste materials not only occupies the land, but also causes serious pollution to the environment, which is not conducive to the realization of the current concept of energy conservation and environmental protection. In recent years, with the development of enterprises, most companies have begun to recycle waste resistant materials. In metallurgical auxiliary materials branch of pangang group, for example, by using waste material recycling, resistant to the abandoned refractory material made of various materials, such as magnesite brick masonry wall with the furnace, the taphole with skateboard, masonry in blast furnace cover with high alumina brick, etc., used in pangang's factory production, greatly reduce the production cost of enterprises.

I. The existing problems in the reuse of waste refractory materials in China
1. Lack of awareness
At present, some enterprises use simple workshop production and products are relatively simple. The development of the enterprise has had an impact. They only pay attention to the purchase of raw materials, but pay little attention to discarded durable materials. There are some misunderstandings.
2. Lack of relevant research and technology
In China's current development, due to the relatively late start of the utilization of abandoned refractory materials, although some enterprises such as panzhihua steel and baosteel have made some progress in the relevant utilization in recent years, there are still some deficiencies in the depth and breadth of studies, and the overall utilization rate is still low.
3. Lack of reasonable classification
In some enterprises, all kinds of waste refractory materials are stacked together. However, due to the different degree and nature of some output burns, this will affect the processing efficiency in the later stage, and also make the utilization rate of the waste refractory materials not meet the high requirements.

Ii. The recovery method of waste refractory materials
1.Direct use
In the abandoned refractory materials, it is called direct utilization method that is not processed but directly used after removal. For the permanent layer and some places that are not very important, even after the liquid metal container is used up, the damage caused is relatively small, and even some resistant materials do not have obvious changes. So these materials can be directly used to the place with low safety requirements or not the main location. This method can be implemented relatively few varieties of waste materials, but can achieve the purpose of making the best use of everything, as far as possible to reduce the problem of waste.?
2.Primary use
After simple selection and grinding, the waste refractory is made into different granules for use, which is called the primary use method. It can not only solve environmental protection problem, but reduce the occurrence of environmental pollution problem.
3.Intermediate use
Based on the primary use method, the abandoned refractory is further processed by physical and chemical processing, so that the level of the refractory is closer to that of the original material. For example, after the waste skateboard is processed and used as the raw material of the skateboard, the skateboard produced is the same as the new one.
4.Advanced usage
Based on the synthesis principle of the new material, after the grinding process, the following advanced use methods can be used:
(1)after some materials are added, new materials are synthesized by means of high-temperature physical and chemical principles;
(2)as a raw material, pure substances are extracted, such as metallic chromium produced by the purification and reaction of high-chromium brick, which may produce great value;
(3)process them into micro powder or nanometer powder.
The first two methods are more common in current use.

Iii. Classification and utilization of waste refractory materials
1.Waste magnesia carbon brick
After the waste magnesia carbon brick is recycled, it can be directly used and added into the mixture of magnesia carbon brick such as ladle slag line free surface, with the proportion of 30%-50%. All the properties of the waste magnesia carbon bricks recovered before and after utilization are better than the standard indexes. Therefore, it is feasible to recycle magnesia - carbon brick.
2.Waste aluminum magnesium carbon brick
In the production process of aluminum-magnesia-carbon brick with the same material, the waste aluminum-magnesia-carbon brick can be properly added, and the aluminum-magnesia-carbon brick can be broken into fine powder to produce the refractory mud with the same material, so that it can be used in the construction of aluminum-magnesia-carbon brick.
3.Waste magnesia brick and magnesia chrome brick
After the slag-gully castable and waste magnesite brick are crushed, the appropriate amount of addition of magnesite chrome brick raw material and magnesite brick raw material can also be appropriately added in the raw material of magnesite slag-retaining weir plate, and refractory mud can be produced after processing.?
4.Waste high-alumina brick
Waste high alumina bricks can be processed into fine powder to produce refractory mortar. For the granular part, can be used in plastic refractory with different temperature. For example, the castable used in the ladle cover and the plastic refractory used in various repairs.

Iv. Prospect of resource recovery of discarded refractory materials
At present, there are two main ways for the comprehensive utilization of the abandoned refractory materials: machine degraded use, repair use and the pure granule mixing type utilization. Through the research and analysis of the homogenization technology, separation technology and purification technology, part or all of the recycled materials are transformed to replace the genuine particles, so as to improve the comprehensive utilization rate and increase the added value of the products to the maximum extent. At the same time, it is necessary to further study the recycling of high-grade waste refractory materials, so as to make the application of waste refractory materials more extensive.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Problems existing in waste refractory materials and classified reuse
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The cement kilns are made of green and energy-saving refractory materials

 "With green energy-saving refractory cement kiln" main technical indicators:?

 

1) Magnesium iron and aluminum spinel brick: volume is about 2.9 g/cm3 density, coefficient of thermal conductivity (25 ℃ to 350 ℃ +) 3.50 w/m.k;

2) Low thermal conductivity of magnesium aluminum spinel brick: volume density (work) 2.90 ~ 3.05 g/cm3, thermal insulation layer is not higher than 2.65 g/cm3, coefficient of thermal conductivity (700 ℃), 3.713 w/m.k, of which 2.508 w/m.k insulating layer;

3) Low thermal spalling brick: 30 volume density is not higher than 2.2 g/cm3, coefficient of thermal conductivity (700 ℃), 1.433 w/m.k;

4) Low thermal spalling brick: 50 volume density is not higher than 2.4 g/cm3, coefficient of thermal conductivity (700 ℃), 1.58 w/m.k;

5) Heat loss of kiln body: 82.31 ~ 84.38 kJ/ KGCL.This product for the low thermal conductivity series new materials, refractory materials used for cement kiln of all matching, low thermal conductivity, energy conservation and greatly reduce the cement kiln cylinder surface temperature and heat loss, the service life of the refractory materials used for cement kiln and repair cycle coordination and synchronization, improve the production efficiency.At present, the product has been used in many cement production lines.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality tundish dry vibration mix are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Ladle magnesia refractory castable mixing notes
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Ladle magnesia refractory castable mixing notes

 Ladle magnesia refractory castable mixing notes:

1. Stirring with a forced mixer. When mixing, do not mix into the bag, rope head and other debris, affecting the pouring effect and performance.
2. Mixing depends on the on-site unpacking of the castable. The amount of mixing depends on the capacity of the mixer. The castable should be accurately metered and poured into the mixer.
3. The process of dry mixing and dry mixing is adopted. After the casting material is added to the mixer, dry mixing for 2 minutes, adding water about 5.2~5.5%, adding water while stirring, first adding 80% of the total amount, and then depending on the consistency of the stirring material, as appropriate add (and note that the mixing water must be clean tap water, not sewage), wet mix for 4 minutes, and stir for at least 6 minutes, until the castable is uniform.
4. When mixing, strictly control the water consumption and mixing time to ensure the consistency required for the construction. If the castable is too thin, it will seriously affect the quality of the material.
5. The evenly mixed material should be poured in 20 minutes, so as not to be difficult to cast for a long time, affecting the strength of the ladle lining structure.
6. The mixer should be cleaned every time the construction is completed or the type of castable material is changed.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality tundish dry vibration mix are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Ladle magnesia refractory castable mixing notes
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Why do cracks and collapse occur in continuous casting tundish after baking?

 At the corner of the connection between the slag retaining wall and the impact zone, partial shedding was found in the process of continuous casting or after baking and before pouring.

Analysis reasons:
A. it may be caused by collision in the process of pulling out the bag tire and causing internal cracks in the dry material.
B. Due to the poor lubrication effect of the wrapped tire, the pulling out of the wrapped tire will drive the dry material to become loose.
C. Loose dry materials are driven during removal of slag retaining wall template.
D. In the process of tundish hoisting, or in the process of crane cover and cover bumping.
E. Other reasons：Close to the dry vibration material, the cladding slag is obviously lower than the dry material, and it is easy to knock against in the course of crane transportation.

Change in measures：
(1) A layer of daub is added at the corner between the retaining wall and the impact zone, with a thickness of about 10mm. The coating will be applied from the retaining wall to 1/2 of the small face of the impact zone, playing a firm role and avoiding the dry vibration material falling off at the impact zone;
(2) Apply a layer of graphite powder to the retaining wall template before use to lubricate it and avoid dry vibration material cracks in the process of lower template after the tundish is baked;
(3) Before use, add a layer of graphite powder, that is, apply twice. To increase the lubrication effect and avoid the dry material crack in the process of pulling out the tire;
(4) In the process of pulling out the bales, the third repair team will send someone to monitor, so as to avoid pulling out the bump of the babies and causing dry material crack or collapse;
(5) Observe whether there is knock dry vibration material in the cover after continuous casting;
(6) The air holes of the cladding must be fully ventilated before tying the permanent layer.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Why do cracks and collapse occur in continuous casting tundish after baking?
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How to choose tundish nozzles

 Hi, do you know about tundish nozzles I think the answer is yes, let’s do a quiz, which one do you think is better? Please write your choice in the comment, then go through the following to see if your choice is bingo.

Factors Influence the Tundish Nozzle Campaign Life
(1)Weight

When the molding pressure is about 300MPa, the bulk density of the zirconium sizing nozzle is large, the porosity is low, and the zirconium sizing nozzle has no crack after molding, and the molding effect is good. The additive can promote the zirconium sizing nozzle. Sintering is beneficial to the increase of density and the decrease of apparent porosity, and the improvement of thermal shock resistance is obvious.?
In a nutshell, that is, with the same drawing, heavier the weight is, the longer service life the tundish nozzle is.

(2)Zirconia Core


a) The content of zirconia of the inner core, we can say that the higher content of zirconia , the better performance will be achieved.
b) Length of zirconia core, with the longer zirconia core, the tundish metering nozzle is better.

(3)The smooth appearance means superior production process and stable quality.

Category of Tundish Nozzle
(1)Fully homogeneous sizing nozzle
The nozzle is composed of ZrO2 (60%~95%). The higher the content of ZrO2, the stronger the erosion resistance of the nozzle, the longer the service life and the higher the cost.
Advantage
Uniform chemical composition, good integrity, high strength, corrosion resistance, long service life, safe and reliable.
Disadvantage
High production cost.
(2)Compound sizing nozzle
The body is a low zirconium material, mostly zircon material, and the composite is a high zirconia material. The two are directly combined together, molded once and fired together.
Advantage
The amount of ZrO2 is greatly reduced compared with the homogenizatio type, the production cost is low, the strength is high, and the corrosion resistance is good.?
Disadvantage
Due to the zirconia content of the inner and outer layers is different, the linear expansion coefficient of the material is different, during use, there will be crackage.?
(3)Inlaid sizing nozzle
The inlaid sizing nozzle is divided into two parts: the outer casing and the inner core. They are respectively made of refractory mud and bonded together; the nozzle body is generally made of high-aluminum material; the inner core is made of zirconia.?
Advantage
low production cost and good thermal shock resistance.
Zirconia? content can be produced according to different requirements.
Economic and good performance.
So what’s your answer now? Yes, A is the better choice and that is the one manufactured by CX refractories. Hope that the share is helpful for you to make the right choice in the future.?

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:How to choose tundish nozzles
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Measures to improve the life of electric arc furnace lining

 1. Selection of refractory materials.

Refractories for furnace building have strict standards for alumina content, bulk density, compressive strength at room temperature, flexural strength at high temperature and apparent porosity. Magnesia carbon brick has the characteristics of good corrosion resistance, good high temperature strength, long service life, etc., and is widely used in the construction of furnace linings.

2. Masonry of furnace lining.

The furnace lining must be of good quality. When laying bricks of various types of road linings, attention should be paid to leveling, the brick gaps should be controlled at 2-3mm, and the furnace door and steel tapping should be built in strict accordance with the requirements. In the early days, the furnace body mostly used air hammer to tie the tar magnesia lining as a whole. The working conditions of the workers were poor. At the same time, the lining had low bulk density, large apparent porosity, poor resistance to slag erosion and erosion, and severe slag line erosion during the smelting process. After switching to tar-magnesia sand combined brick masonry, not only the production process is mechanized and automated, and the bulk density is also increased from 2.3 to above 2.8. The slag erosion and erosion resistance are greatly improved, especially in the slag line and tapping. Near the mouth, the anti-erosion ability is obviously enhanced.

3. Reasonably determine the diameter of the pole center circle of the electrode.

The life of the furnace lining has a great relationship with the distribution of the electrode center circle (the circle made by the center of the electrode hole in a regular triangle). The diameter of the electrode center circle determines the electrode distribution position and the power distribution of the three-phase electrode, which has a greater impact on the melting rate of the charge and the life of the furnace lining. Increase the diameter of the pole center circle of the electrode, the electrode is close to the furnace wall, and the furnace lining will accelerate the corrosion rate under the high temperature of the arc, and the heating of the charge in the middle of the furnace body will be weakened; reduce the diameter of the pole center circle of the electrode, the steel material in the middle of the furnace body will be easier Local high temperature is generated, and the melting rate of the charge on the slope slows down. According to the experience of steel mills, when the diameter of the electrode circle is equal to 0.35-0.39 of the diameter of the melting chamber at the level of the furnace door, the life of the furnace lining is the best, and the minimum coefficient is used when the diameter of the melting chamber of the electric furnace is larger.

4. Optimize and strictly enforce the operating rules.

The life of the furnace lining is related to many factors and is closely related to the smelting operation. Incorrect smelting operation will shorten the life of the furnace lining. Including the strict power supply system to control the temperature of molten steel, charge processing and charging, popularize the foam slag process, rationally organize production, and shorten the smelting time.

5. Maintenance of furnace lining

Add an appropriate amount of light-burned dolomite to the charge to increase the MgO content in the slag, and increase the alkalinity of the slag to reduce the erosion of the furnace lining. Furnace repair is an important part of improving the life of the furnace lining, which can effectively reduce the loss of the furnace lining. Generally, the dry gunning method is adopted. After tapping, take the time to strengthen the gunning for severely corroded parts such as both sides of the furnace door, tapping mouth, and No. 2 slag line. Gunning mending is based on the principles of uniform mending, quick mending, and thin mending to improve the adhesion rate of gunning material, reduce heat loss, achieve good sintering effect and reduce furnace lining erosion. When there is a large area of potholes at the bottom of the furnace, the wet patch method is used, and brine or water glass is used as the adhesive. Timely maintenance of the furnace lining can effectively extend the furnace life.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality EBT Filler are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Measures to improve the life of electric arc furnace lining
Company name: Henan Changxing Refractory Materials Co.,Ltd
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Causes of damage to ladle purging plug

 1. Thermal stress.

The refractory material of the ladle purging plug working surface is directly in contact with the high-temperature molten steel, and is also subjected to the continuous blowing of the cold air flow, which generates a large temperature gradient, resulting in a high concentration of stress.

2. Scour, and wear.
The blown gas gives a certain reverse impact force to the refractory material of the ladle permeable brick working surface and its surrounding area.

3. Chemical erosion and steel clamping.
The material of the ladle purging plug reacts with the molten steel penetrating into the slit and the slag that has entered the working layer, which changes the physical and chemical properties of the working layer of ladle purging plug and increases the tendency of peeling.

4.Oxygen cleaning.
In the actual application process, thermal stress is one of the most important reasons for the damage of ladle purging plug.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality ladle purging plug are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Causes of damage to ladle purging plug
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Factors influence MgO-C bricks quality

 Magnesia carbon brick is a high melting point basic oxide magnesium oxide (melting point 2800 ° C) and a high melting point carbon material which is difficult to be infiltrated by slag as a raw material, and various non-oxide additives are added.

A non-burned carbon composite refractory material combined with a carbonaceous binder. Ladle Magnesia carbon brick is mainly used for the lining of converter, AC arc furnace, DC arc furnace, slag line of ladle and so on.

The process factors affecting the performance of magnesia carbon bricks are mainly refractory raw materials, binders and additives.

1. Magnesite

The high-purity sintered magnesia was used in the original production of magnesia carbon bricks abroad. With the in-depth study of the use of magnesia-carbon bricks, the following reactions were observed at high temperatures:

MgO+C→Mg↑+CO↑

This reaction generally starts at 1650 ° C, and the reaction is intensified at l750 ° C. This is one of the important reasons for the loss during the use of magnesia carbon bricks, and it is also the reason why the loss of magnesia carbon bricks at 1700 ° C or above is significantly increased. The impurities such as SiO2 and Fe2O3 in the magnesia have a promoting effect on the above reaction, and therefore, it is desirable that the magnesia has a high purity.

Compared with sintered magnesia, fused magnesia has a more complete crystal structure and a more stable carbon reduction. Especially the characteristics of large-crystal fused magnesia are more prominent, so the production of magnesia-carbon bricks begins to shift. Fused magnesia. The fused magnesia-sintered magnesia may also be used in combination in consideration of the bonding state of carbon and the wett ability of the binder.

The results of the use of magnesia-carbon bricks show that the best effect is on the production of magnesia-carbon bricks with magnesia with high MgO content, large magnesia phase crystal particles and calcium-silica ratio greater than 2.

2. Graphite

Graphite is another essential component in magnesia carbon bricks. Graphite has good basic properties of refractory materials. The main physical and chemical indicators are: fixed carbon 85%～98%, ash 13%～2% (main component SiO2, Al2O3, etc.), relative density 2.09～2.23, melting point 3640K ( Volatile). Since graphite is very easily oxidized, it has not attracted much attention for a long time.

There are three reasons for the oxidation of graphite during the use of magnesia carbon bricks:
(1) Oxidation of graphite by oxygen in the air;
(2) Oxidation of graphite by oxides in the slag;
(3) Oxidation of graphite by impurity oxides contained in graphite itself. These oxides mainly refer to SiO2 and Fe2O3.

After the impurity oxide and graphite in the magnesia carbon brick react, the structure of the brick body is loose, the gas permeability is increased, and the strength is decreased, which is the internal cause of the damage of the magnesia carbon brick. Therefore, most of the magnesia carbon bricks used are graphites with high purity and large crystals of phosphorus.

3. Bonding agents

Bonding agents are essential for magnesium carbon bricks and other carbon-containing refractory products. There is no mutual solubility relationship between graphite and refractory oxide, and it is impossible to sinter each other.

They are cured by bonding at room temperature. The binder is coked and carbonized, and carbon is combined with graphite at high temperatures. Generally, the binder refers to organic substances such as resins and asphalt. The high-temperature coking of the binder forms about 3% of carbon after carbonization.

Although this amount is not much, it is the most dynamic component in magnesia-carbon bricks or other carbon-containing products, and has an important influence on the high-temperature performance of the product. Magnesia-carbon brick binders can be generally divided into three types: phenolic resin, modified asphalt, and petroleum cracking by-products. Among them, phenolic resin is the best used and the most used.

4. Additives

The oxidation of graphite is one of the most important causes during the destruction of magnesia carbon bricks. Due to the loss of carbon from oxidation, the structure of the brick body is loose and the strength is lowered. The damage process follows the path of oxidative carbon loss → structural looseness → erosion → erosion and dissolution.

In order to improve the oxidation resistance of the ladle magnesia carbon brick, a certain amount of additives may be added, including silicon powder, aluminum powder, FeSi alloy, CaSi alloy, SiC, Si3N4, B4C and the like. Another effect of the additive is to "bridge" between the refractory oxide and the graphite to form a strong bond between the graphite and the refractory oxide, which is facilitated by the formation of a new mineral phase at a certain temperature.?For further details, please feel free to contact us, we would be your reliable partner.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality changxing refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Factors influence MgO-C bricks quality
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Brief introduction of magnesia-carbon brick raw material

 1. Fused magnesia sand: it is an alkaline refractory made of natural magnesite, light fired magnesia or sintered magnesia fused by an arc furnace. Fused magnesia main crystal phase of periclase, melting point is 2800 ℃, 1600 ℃ sublimation in vacuum, in reducing atmosphere above 2000 ℃ sublimation, is greater than 3.40 g/cm3 density, porosity of 0% to 10%, 5.5 mohs hardness, resistance to basic slag erosion is very strong, stable chemical properties, under the high temperature of 1500 ℃ and other than the silica brick no or weak reaction between all kinds of refractory materials. The appearance should be clear after the complete melting crystallization, do not allow mixing with other magnesia or sundries.

2, Graphite: is a carbon as the main component of the natural mineral, it has high temperature resistance, heat conduction, electricity, lubrication, plastic and corrosion resistance and other properties. It is the main material containing carbon resistant material. The graphite used in refractory is flake graphite, which is divided into high purity, high carbon, medium carbon and low carbon graphite according to the fixed carbon content. The color is iron black, steel gray. The density is 2.09-2.23g/cm3 with a melting point of 3700℃±100℃(in vacuum), high thermal conductivity, small expansion coefficient, small elastic modulus, good lubricity, good conductivity, stable chemical properties, no reaction with acid, alkali and organic solvents at room temperature, and steel solution is difficult to wet, with good anti-erosion performance.

3. Phenolic resin: it is a non-aqueous organic binder for refractory materials. It is prepared by condensation of phenol (or cresol, dicresol, or resorcinol) with formaldehyde (or glycolaldehyde) under the action of catalyst.?

The main advantages are

(1) high carbonization rate (52%);

(2) good adhesion, high strength of the formed body;

(3) high bonding strength after burning;

(4) the rate of hardening can be controlled at room temperature;

(5) less harmful substances, can improve the operating environment.

According to heating properties or structural morphology classification, there are thermosetting phenolic resin and thermoplastic phenolic resin, according to product morphology classification, there are liquid phenolic resin and solid phenolic resin (granular and powder), according to the curing temperature classification, there are high temperature solidified type 130℃-150℃; There are medium temperature fixed type 105℃-110℃; There are room temperature solidified type 20℃-30℃.g material.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality changxing refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Brief introduction of magnesia-carbon brick raw material
Company name: Henan Changxing Refractory Materials Co.,Ltd
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Application fields and advantages of refractory castables

 As a new type of refractory material, castable is mainly characterized by high fluidity and is suitable for monolithic refractories formed by casting. Compared with other monolithic refractories, it has higher binder and moisture content and is fluid. Because of its better performance, the application range of unshaped refractories is wider, and the materials and binders used can be selected according to the conditions of use. It can be directly poured into a lining body for use, and can also be used as a prefabricated block by pouring or vibrating method.

Refractory castables are developed on the basis of low cement series refractory castables, and are a type of refractory castables that have developed vigorously in recent years. Its varieties include high-tech, high-performance and high-purity refractory castables, chromium-containing, carbon-containing and micro-expansion refractory castables, etc., which are mainly used in steel smelting furnaces, ladles, tundishes, fluidized bed boilers and regenerative heating furnaces on thermal equipment, the service life is increased and good economic effects are obtained.

Refractory castables use high-quality, high-purity or synthetic refractory raw materials and additives, ultra-fine powder technology, excellent binders and high-efficiency additives. Under the guidance of the basic theory of refractory materials, according to the use and operating conditions of various thermal equipment, scientific formulate the material formula, precisely adjust the particle size composition, reasonably select the binder and admixture, and formulate the new technology refractory castable with excellent performance and longevity. Taking the high-tech refractory castable for ladle as an example, it is characterized by sub-combination, self-sintering, and self-expansion under high-temperature use conditions. The "three-self" principle is also embodied in different degrees in the new technology refractory castables, so its performance is excellent and the service life is significantly improved.

High-quality, high-purity or synthetic refractory raw materials are the basis for the preparation of new-tech refractory castables, and also the basis for the production of high-efficiency unshaped refractory materials. Such as tabular corundum, dense corundum, white corundum, corundum mullite, alumina-magnesia spinel, high-purity magnesia and spherical high-bauxite clinker. In addition, brown corundum, white corundum, sub-white corundum and aluminum-magnesium spinel are made from high-quality bauxite clinker and other raw materials after sintering or electric melting. Process treatment, its performance is excellent, can partially replace alumina-based synthetic materials, and is widely used.

The excellent performance of refractory castable means that its performance indicators are suitable for the use requirements of thermal equipment and can achieve the purpose of longevity. Without the longevity of the kiln, excessive pursuit of performance indicators is of no benefit.

The scope of application of new technology refractory castables is also defined. For example, ultra-fine powder combined with magnesia refractory castable is applied on the ladle slag line, and the effect is better, but as the anti-slag material at the bottom of the heating furnace, because the use temperature is about 1200 ℃, the sintering strength is not reached, and it is difficult to achieve good results. .

Refractory castable is a milestone in the history of the development of unshaped refractories. Its important sign is its entry into the high-temperature smelting furnace of steelmaking and ironmaking, and significant results have been achieved. In the future, according to the use and operating characteristics of the kiln and its thermal equipment, advanced raw materials, scientific formulas, reasonable grading, and elaborate production will be used to develop new high-performance and functional refractory castables to meet the needs of my country’s iron and steel industry. The need for rapid development.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Application fields and advantages of refractory castables
Company name: Henan Changxing Refractory Materials Co.,Ltd
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Process technology introduction of tundish sizing nozzle quick replacement system

At present, the representative quick-change systems at home and abroad are:

(1) Comcast nozzle adjustment system (CNM);

(2) Danieli flying nozzle replacement system (FNC);

(3) Interstroke sizing nozzle replacement system (MNC);

(4) Kurosaki Harima Co., Ltd. Tundish Nozzle Online Replacement System (OTNC);

(5) Vesuvius calibrated nozzle replacement system (CNC).

Although there are many quick-change systems, there are two main ways to sum up from the replacement method:

The quick replacement methods are:

1.Hydraulic quick change method:

The in-use nozzle and the spare nozzle are placed on the same plane back and forth, supported by a high-temperature spring, and replaced with a hydraulic ejector method;

The quick replacement of the sizing nozzle adopts a specific mechanical device. There is a running slideway with an accurate size in the device, and the sizing nozzle and the spare sizing nozzle in the working state are positioned in the slideway.

When the sizing nozzle needs to be replaced, press the start button, and the hydraulic drive device pushes the standby nozzle to slide from the standby position to the working position within 0.1s, and the original working nozzle is pushed out to the collection position;

The molten steel is injected into the mold through the new nozzle, so that the sizing nozzle can be quickly replaced during the continuous casting process. After replacement, the deviation of the center line of the upper and lower nozzles is less than 0.1mm.

2. Manual quick change method:

The in-use nozzle and the spare nozzle are placed in a fan shape on the same plane, mechanically fixed, and replaced manually. The manual replacement mechanism is simple, divided into four parts: the base, the fixed plate, the sector plate, and the spring pressure regulator.

There are two sizing nozzles in the fan-shaped skateboard frame. Moving the handle of the fan-shaped frame can make the casting hole of one of the nozzles on the fan-shaped skateboard frame work, and the other nozzle has been moved to the other side of the device. Replace the removed nozzle brick.

The characteristics of the device are:

(1) The device has reasonable structure, simple structure, convenient maintenance and low labor intensity.

(2) Using a unique spring pressure regulator, there is a certain pre-pressure on the nozzle, which can quickly replace the new nozzle brick under the condition of continuous flow.

Article Source:Process technology introduction of tundish sizing nozzle quick replacement system
Company name: Henan Changxing Refractory Materials Co.,Ltd
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Influence of silica micropowder on the hydration of calcium aluminate cement

 In most cases, silica powder is used together with cement and other binders. Silica powder has a higher surface area, which can provide more nucleation sites for the hydration products of calcium aluminate cement, which is beneficial to the crystallization of the hydration products, and improves the cementation between the castable particles, thereby increasing the castable Strength of Silica powder can change the hydration product composition of calcium aluminate cement.

Studies have shown that adding silica powder to the clay clinker castable combined with calcium aluminate cement and curing at 40°C can affect the production and conversion of calcium aluminate cement hydration products. Pure calcium aluminate cement is hydrated for 24 hours, and the production of β-C2AH8 and α-C2AH8 of its hydration products increases with the extension of curing time, but the production of α-C2AH8 gradually decreases after 24h. After adding silica powder to calcium aluminate cement, the production of α-C2AH8 and β-C2AH8 can reach the maximum after curing for 24 hours. After 24h, α-C2AH8 and β-C2AH8 were converted into calcein hydrate C2ASH8. Silica micropowder is collected by vapor precipitation in industrial production, and it contains a variety of alkali metal impurity elements inside, which makes it exhibit different chemical properties in aqueous solution, such as zeta potential and pH value. Some studies have shown that silica micropowders with different pH values in aqueous solutions have a greater impact on the hydration process of calcium aluminate cement (CAC).

With the increase of pH value (2.77, 6.91 and 7.66), silica powder can increase the hydration rate of calcium aluminate cement and promote the generation of hydration products. This may be because the higher the pH value of silica micropowder, the more OH- is ionized in the aqueous solution, which accelerates the "hydroxylation" process in cement hydration, thereby accelerating the hydration reaction of calcium aluminate cement and promoting the hydration products of cement are formed; When the pH value of the silica powder is low enough, the aqueous solution will dissociate more H+, and part of it will neutralize the OH- and hinder the "hydroxylation" process of calcium aluminate cement, thus Delayed the hydration rate of cement.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality changxing refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Influence of silica micropowder on the hydration of calcium aluminate cement
Company name: Henan Changxing Refractory Materials Co.,Ltd
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Utilization status of discarded magnesia carbon bricks

 At this stage, the iron and steel industry has overcapacity. With the country's continuous strengthening of capacity reduction, the continuous deepening of supply-side reforms, and the increasing attention to environmental protection effects, energy conservation and consumption reduction have gradually become the key to the survival of iron and steel enterprises. The steel industry has a huge demand for refractory materials, and the annual output of waste refractory materials has reached 7 million tons. Among them, most of the refractory materials dismantled after use by steel mills are magnesia-carbon. Recycling it not only greatly saves production costs, but also achieves environmental protection and solid waste recycling. Therefore, the development and utilization of waste magnesia carbon bricks at home and abroad has been increasing. The current status of the utilization of waste magnesia-carbon bricks by domestic and foreign iron and steel enterprises is as follows.

1. Preparation of metallurgical auxiliary materials

As an important way of recycling economy for metallurgical enterprises, the recovery of waste refractory materials and the preparation of metallurgical auxiliary materials have developed rapidly. Domestic Company cooperates with Henan Company to combine waste magnesia-carbon bricks and some additives to make multifunctional magnesium balls, which can replace dolomite in full or part as slag-making auxiliary materials, which are the steelmaking, slag-making process and slag-splashing process of the converter creating condition.

2. Preparation of recycled magnesia carbon bricks

Baosteel uses waste magnesia-carbon bricks from the ladle slag line as raw materials, after sorting, removing surface inclusions, slag and oxide layer, hydration and other treatments, adding 3% to 4% thermosetting phenolic resin ingredients and mixing them at 200℃, 260MPa Recycled ladle magnesia carbon brick are made after hydraulic pressure and 5h curing treatment, the effect is similar to the use of new magnesia-carbon bricks.

3. Preparation of tundish dry materials

The main raw material of tundish magnesia dry vibrating material is fused magnesia. With the changes in market demand in recent years, its price has far exceeded the cost, making the production of magnesia dry vibrating material basically without economic benefits. This situation has promoted the development of the use of recycled magnesia-carbon materials to prepare tundish dry materials. Guangzhou Iron and Steel, Maanshan Iron and Steel, etc. have conducted related research.

Guangzhou Iron and Steel has carried out research on the partial replacement of mid-range magnesia with waste magnesia carbon bricks to prepare dry materials for recycled tundishes. The waste magnesia-carbon brick particles were used to partially replace the mid-grade sintered magnesia in the original composition for batching. After making the strip samples, the performance was tested. It was found that both the shaped and unshaped waste magnesia-carbon brick particles could be used for the dry material of the tundish, and the shaping was used. When granular, the overall performance is better.

4. Preparation of gunning material for ladle

The magnesia-carbon bricks disassembled from the steel ladle slag line of Shan Iron & Steel Co., Ltd. are treated as qualified raw materials after removing the surface slag and iron, crushing, removing iron, and sieving. Since Shan Iron & Steel's ladle gunning repairs the slag line of the red hot ladle, the water in the sprayed layer quickly evaporates due to the high gunning temperature, making Al4C3 too late to hydrate. Therefore, it is not necessary to hydrate the raw materials during the production process.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Utilization status of discarded magnesia carbon bricks

Company name: Henan Changxing Refractory Materials Co.,Ltd
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Brief introduction of LRF delta castable

 Ladle is the main thermal equipment for loading molten steel. In the process of loading and transporting molten steel, due to the heat loss at the mouth of the ladle, many steel plants have chosen to increase the ladle roof to reduce the heat loss in recent years. There are many types of unshaped refractory materials for ladle lids, but the refractory castables used for ladle lids that can improve the use effect of ladle lids need to choose suitable castables according to the actual use environment.

The castable for ladle roof can choose high-aluminum mullite castable or low-cement steel fiber castable. High-aluminum mullite castable is to choose high-quality high-alumina bauxite as refractory aggregate, and add appropriate refractory powder according to the formula. The low-cement steel fiber refractory castable is a kind of refractory castable added with steel fiber. Steel fiber can improve the wear resistance and flexural performance of the castable. The low cement content can effectively improve the overall high temperature resistance of the castable. As the lining of the ladle roof, it can effectively resist the corrosion of molten steel gas and molten slag.

The ladle delta castable can be directly poured into the ladle roof mold during use. The high-alumina mullite castable has excellent high temperature performance, high compressive and flexural strength, and good volume stability. Because high alumina bauxite has good heat vibration performance, as the main raw material of the refractory castable for the ladle roof, can increase the service life and use times of the ladle, reduce the maintenance frequency of the ladle roof, effectively increase the turnover speed of the ladle, speed up the steelmaking production rhythm, and ensure the quality of molten steel. And production anterograde played an important role.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality High Alumina Cement are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Brief introduction of LRF delta castable
Company name: Henan Changxing Refractory Materials Co.,Ltd
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4 indicators that determine the high temperature performance of refractories

 Refractory materials are subject to physical, chemical, and mechanical effects at high temperatures (usually 1000~1800°C) during use, which are easy to melt and soften, or are corroded, corroded, or cracked and damaged, causing the operation to be interrupted, and Contaminated materials. Therefore, it is required that refractory materials must have properties that can adapt to various operating conditions.

(1) Refractoriness

Refractoriness refers to the temperature at which a material reaches a certain degree of softening under the action of high temperature, which characterizes the performance of the material against high temperature. Refractoriness is the basis for judging whether a material can be used as a refractory material. The International Organization for Standardization stipulates that inorganic non-metallic materials with a refractoriness above 1500°C are refractory materials. It is different from the melting point of the material, and it is a comprehensive performance of a mixture of multiphase solids composed of various minerals.

(2) High temperature load deformation temperature

Also known as the refractory softening point under load or the refractory deformation temperature under load, it means the resistance of the refractory to the combined action of high temperature and load under a constant load or the temperature range in which the refractory exhibits significant plastic deformation. The maximum use temperature can be inferred from the refractory material’s load softening temperature.

(3) High temperature volume stability of refractories

Refractory materials produce volume expansion under the action of high temperature for a long time, which is called residual expansion. The size of the residual expansion (deformation) of refractories reflects the quality of high-temperature volume stability. The smaller the residual deformation, the better the volume stability; on the contrary, the worse the volume stability, the easier it is to cause deformation or damage to the masonry.

(4) Thermal shock stability

The ability of refractory materials to resist sudden changes in temperature without being damaged is called thermal shock stability. This performance is also called thermal shock resistance or temperature sudden change resistance.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:4 indicators that determine the high temperature performance of refractories
Company name: Henan Changxing Refractory Materials Co.,Ltd
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