Processing of steel scrap

The processing of steel scrap differs from different kind of refractory material quality and shapes. Breakable and irregular shape lumps can be broken by the hammering of heavy punch, Extra thick and extra long scraps should be cut into proper sizes by flame cutter. The scraps with even larger sizes can be broken with blasting method. Thick waste steel plate and merchant steel should be cut with shearing machine. Light scraps with small volume weight like offcut of light sheets, steel wire, waste car shell, should be compressed to blocks with packer and then bundled. The steel cuttings produced by cutting should be compressed to blocks by briquetting machine after deoiling. Scraps mixed with other kind of metals ashould be broken, then get steel scrap with magnetic separation. A new technique of breaking under -50～-100℃ low temperature with the help of liquid nitrogen has been developed in recent years, but the problem of separating steel scrap and nonferrous metal and other impurities was not completed solved. The use of mixed scraps should be kept within a certain portion to avoid affecting the quality of steel.

Magnetic separation
Magnetic separation is to use the magnetism difference between the different material in solid waste to separate with inhomogeneous magneto, it is the most effective method in separating ferrous metals. After solid waste is put into magnetic separator, magnetic particles will be magnetized under the effect of inhomogeneous magneto, and then sucked into the cylinder by the force of magnetic field, then discharged. Non-magnetic particles stay in. The magnetic sources adopted in magnetic separation are usually electromagnet and permanent magnet.

Cleaning
It is to use different kind of chemical solvents or hot surface active agent to clean up the greasy dirt, rust and sidiment on the surface of scrap. Usually used for generators, bearings, gears that are polluted by grease, lubricant, oil, etc.

Preheating
Scraps are usually polluted by oil, lubricating grease, etc., the oil and lubricating grease which are unable to evaporate immediately could pollute the molten metal. For open storage scaps, after affected by moisture, as it contains moisture and other easily vaporized material like lubricating grease, it could expand under high temperature in furnaces. Therefore, it should be preheated with flames to remove the moisture and grease, then put into furnaces.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

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Refractories and Classification of Refractories

Refractories are the raw materials which are resistant to heat and exposure to different degrees of mechanical stress and strain, thermal stress and strain, corrosion/erosion from solids, liquids and gases, gas diffusion, and mechanical abrasion at various temperatures. In simplified language, they are considered to be materials of construction which are able to withstand high temperatures. Refractories are usually inorganic non-metallic materials with refractoriness greater than 1500 deg C. They belong to coarse-grained ceramics having microstructure which is composed of large grains. The basis of body is coarse-grained grog joined by fine materials.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar,china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
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The more details of graphite electrodes

Ultra-high power graphite electrodes refer to graphite electrodes that allow the use of current densities greater than 25 A / cm2. Ultra-high power graphite electrode is mainly used in ultra-high power electric furnace and ladle furnace.
Graphite electrodes are manufactured with high quality refractory raw material including petroleum cokes, needle cokes and coal-tar-pitch through the production process of calcining, crushing, burden, mixing kneading, extruding, baking, impregnation, graphitization, manufacturing, packing.

Our refractory products are characterized by superior compact structure, good electrical and thermal conductivity, high mechanical strength and high resistance to oxidation and corrosion in high temperature.

The graphite electrodes are widely use in electric are furnaces and ladle refining furnaces for steel making and used in electric smelhing furnaces for producing industrial silicon, yellow phosphorus, corundum, nonmetals and so on. HP Graphite electrodes is one essential part of the refractory raw material industry.

There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information. Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.

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Function of taphole clay

Stemming is used to seal the taphole refractory, at present there are water stemming and can be divided into two types: anhydrous stemming, the former is used in low pressure, strengthening smelting degree is not high, the small blast furnace, the latter in high top pressure, high degree of intensification of smelting of large and medium blast furnace.
Stemming form can be divided into two parts - refractory aggregate and binder. Refractory aggregate means corundum, mullite insulating firebrick, flint clay and other refractory raw material and modified materials such as coke, mica.Binder for water or organic material such as tar pitch and phenolic resin, also adding SiC Si3N4, expansive agent and additive, etc.Aggregate in a certain size and weight matrix, under the harmonic of binder has certain plasticity, thus can through the mud gun hitting iron mouth to block the molten iron.
With water as a bond is called the water stemming, tar, organic material such as resin as binder, called anhydrous stemming.

Main functions:
1) Wall, taphole requirements stemming good filling and sintering;
2) The stability of the iron to stemming easy open hole and resistance to erosion, erosion;
3) Protecting hearth, demand stemming rapid heating without crack, and the combination of old and new stemming high strength;
4) The opening performance is good, open machine drilling bit easily;
5) Moderate plasticity, facilitate mud gun operation and the formation of iron mouth balling;
6) Good volume stability, small volume change at high temperature, not contraction due to leakage of hot metal.

Anhydrous stemming advantages:
1) High strength, and maintain the stability of blast furnace condition (iron mouth depth, the tapping time fluctuations, whole taphole wind rate, etc.) is of great importance, which makes the blast furnace has a production base.
2) Slag resistance is strong.Stemming consumption is low, the general water cannon is one 5 of the mud.
3) It has a certain expansion performance. Have appropriate porosity and strength, can adapt to more than 2000 m.The large blast furnace use.
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The clssification of corundum brick

According to the refractory raw materials, corundum brick can be divided into sintered, rebond sintered, fused and rebond fused corundum bricks.
The first is made from sintered corundum clinker, while the third is made from light burning corundum powder particles and fine corundum powder.
The second is fused corundum refractories, including fused cast corundum refractories. Fused cast corundum refractory or fused cast alumina refractory is made by casting molten glass into a mold and then cooling it into a solid. The refractory raw materials are always melted in an electric arc furnace.
Rebond fused corundum brick is made of fused corundum clinker and fine fused corundum powder or sintered corundum powder as the matrix. The key to its production is the processing of fused corundum materials. when fused gray or white corundum used as the main refractory raw materials, the frits should be smashed first and then seleted to remove silicon iron alloy. Silicon iron alloy may cause the burst of refractory products.
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Tabular Alumina for High Purity Corundum Brick

High purity corundum brick with Al2O3 content above 99% is studied based on tabular alumina and white fused alumina (WFA) as single aggregate and the combination of both. In comparison with Tabular alumina, WFA aggregate has relatively higher SiO2 content of above 0.10% and shows fluctuation on soda content. WFA also has a high open porosity of 8.8%, which very often exists in the form of single large pore or in the form of agglomeration of pores rather than the small closed and evenly distributed pores in tabular alumina. Refractory brick china with different ratio of tabular alumina and WFA have been tested for firing shrinkage, bulk density and apparent porosity, cold and hot strength, thermal shock resistance, and abrasion resistance. Also slag tests with a coal gasifier slag and an oil cracking slag have been conducted. The results from this evaluation conclude that high alumina brick outperforms WFA bricks and importantly gives more balanced performance.

Introduction
High purity corundum brick is widely used as refractory lining for oil cracking unit, coal gasifier, carbon black furnaces, black liquor gasification and other industrial furnaces. This is attributable to the outstanding performance of corundum brickon chemical corrosion resistance, mechanical abrasion resistance and thermomechanical properties like high temperature strength, refractoriness under load and creep resistance, even in environments with corrosive gas or liquid and with high pressure.
Synthetic alumina based aggregates like white fused alumina and tabular alumina are the two main aggregates available for high purity corundum brick. They are selected due to low impurity content (e.g. SiO2), high bulk density and thermomechanical properties, which enables corundum bricks that meet the requirements on thermal, chemical and structural attacks [1] which gasifiers and other furnaces apply in operation.

The different processes for WFA and tabular alumina production (fusion vs. sinter) certainly create differences between the aggregate, which also have an impact on the properties and performance of the corundum brick. Tabular alumina is well received and extensively used in the refractories for steelmaking such as slide gate plate, Al2O3-MgOC brick, castables and pre-cast shapes.

However, for a long period of time, WFA is very commonly used as the aggregate for high purity corundum brick to non-steel applications like gasifier and other industrial furnaces. It is often claimed that WFA aggregate has higher bulk density which consequently increases the density of fire brick China and the corrosion resistance which could enhance the overall performance. However these perceptions should be investigated by an extensive evaluation. This work is designed to evaluate in a comprehensive way the differences on performance of tabular alumina and white fused alumina in respect to aggregate itself and brick properties in order to understand these differences and provide appropriate application guideline for high purity corundum brick.

1. Refractory raw material Almatis global tabular alumina product T60/64 and a common commercial Chinese WFA grade are selected as the aggregate and fine. In the matrix, Almatis’ calcined alumina CT800FG is also used. Sulphite pulp liquor is used as temporary binder for corundum brick making.

2. China refractory brick formulation Five recipes are used in this evaluation. As per the tabular alumina content in aggregate, the formula is named as T100, T75, T50, T25 and T0 and the numbers stand for tabular alumina content in respective brick. Table 1 gives the details with bold highlighted for tabular alumina.

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The advantage and disadvantage of graphite electrode

Ultra-high power graphite electrode:
Graphite electrodes is mainly made of petroleum coke and needle coke as refractory raw materials, and coal tar pitch as a binder, which is prepared by calcining, compounding, kneading, pressing, calcining, graphitizing and machining and is released in an electric arc furnace Electrical energy on the charge heating and melting of the conductor.
Ultra-high-power graphite electrode are graphite electrodes that allow current densities greater than 25 A / cm2 and are mainly used in ultra-high-power steelmaking electric arc furnaces.
HP Graphite electrode advantages:
(1) Processing speed is faster: Under normal circumstances, graphite machining speed can be 2 to 5 times faster than copper; and discharge processing speed is 2 to 3 times faster than copper;
(2) The material is more difficult to deform: obvious advantages in the thin-walled electrode processing.
(3) lighter weight: the density of graphite is only 1/5 of copper, large electrode for electrical discharge machining, can effectively reduce the machine tool (EDM) burden; more suitable for large mold applications.
According to the use of different power and current, using different refractory raw materials and production technology, can be divided into ordinary power graphite electrodes, high power graphite electrodes, ultra-high power graphite electrodes. Graphite electrode has good electrical properties and chemical stability, high mechanical strength at high temperature, low impurity content, good vibration resistance, is a good conductor of heat and electricity.
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Graphite electrodes are widely used in steel-making electric arc furnaces, refining furnaces, ferroalloy production, industrial silicon, yellow phosphorus, corundum and other submerged arc furnaces and other arc furnaces that produce high temperatures.
HP Graphite electrode has good electrical properties and chemical stability, high mechanical strength at high temperatures, less impurities, good vibration resistance. It is a good conductor of heat and electricity.
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The features and application of graphite electrode

Graphite electrodes find application in manufacture of Steel and other non-ferrous metals through the Electric Arc Furnace and the Laddle Furnace routes. It is used as a consumable for conducting high current at low voltage which is necessary for melting and / or alloying processes.

Graphite is the unique material for Electrodes as it optimally fulfils the requirements on the following criteria :
Electric and Thermal Conductivity
Mechanical Strength
Thermal Shock Resistance
Machinability
Thermal Expansion

We are instrumental in manufacturing for our clients a commendable array of HP Graphite Electrode that are demanded for their ease of use, long time service and options for wide ranging usages. Offered range also incorporates Ultra High Power Graphite Electrodes, High Power Graphite Electrodes and Regular Power Graphite Electrodes. These offered Electrodes are prepared by using LWG Furnaces, advanced machinery and latest techniques. Backed by its excellent attributes, this offered range is extensively applauded by our patrons. Addition to this, we ensure customized product for the gratification of esteemed clients.

High power graphite electrodes refer to graphite electrodes that allow the use of current densities below 17 A / cm2. They are mainly used in electric arc furnaces, refining, ferroalloy and submerged arc furnaces.

HP Graphite electrode has advantages of high mechanical strength, low impurity content and good vibration resistance. We are amongst the leading names in the industry, offering technically advanced range of High Power Graphite Electrodes that are performance oriented and are functionally advanced in nature. They have high heating capacity and reduces the electrode consumption to the great extend. High power graphite electrodes reduces the melting cost and are offered at most affordable rates.

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Common castable for reheating furnace

1.Self leveling castable. Self leveling castable is applicable to the furnace parts which are more complex and can not be vibrated by workers.
2.Low cement castable. The low cement castable is suitable for the high temperature zone and moderate temperature zone of the heating furnace, and the service temperature is between 1400~1500 degrees centigrade.
3.Phosphate castable. Phosphate castable is suitable for heating furnace bottom and the zone where it rub with other refractory materials and erosion zone by hot wind. The service temperature is between 1000~1600 degrees.
4.Mullite castable. The mullite castable is charactorized with high thermal shock resistance, erosion resistance, good volume stability and high application temperature. So it is usually used in the key parts of the furnace wall, furnace top and depressed beam, or used to make the burner brick.
5.Light weight castable. The lightweight castable is used for the heat insulation layer of the furnace wall, furnace top, flue and other parts. High strength lightweight castable can also be used as the lining of exhaust systems and hot air pipes.
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The advantages of graphite electrode in chinafirebrick

Graphite electrode is an indispensable material used in the electric arc furnace steel making, for its excellent electrical conductivity and remarkable anti-thermal shock capability. We supply HP graphite electrode for the iron and steel sector. We specialize in providing graphite electrodes of 18 inch diameter and smaller, but larger diameters up to 28" are also available. Carbon electrode sizing ranges from 36" to 55" diameter. Our product line includes:

Advantages:
High temperature strength
Good thermal and electrical conductivity
Low thermal expansion
Appropriate machinability
These features make graphite electrode the most suitable material to melt scraps, DRI, etc.

We supply graphite electrodes for the iron and steel sector. Our main refractory product include:
Graphite and carbon sidewall blocks for aluminum smelting
Graphite electrodes for the steel and iron industry
UHP Graphite Electrodes
HP Graphite Electrode
General Power Graphite Electrode
We’re among the HP graphite electrode suppliers in the nation and can provide you with the raw materials you need at prices you can afford. We offer excellent customer service whether you order graphite electrodes and refractory fire brick.
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The details of HP Graphite Electrode

High power graphite electrodes refer to the graphite electrode that allows the use of a current density of 18 ~ 25A / cm2.
Graphite electrode has good electrical properties and chemical stability. What’s more, graphite electrode has advantages of high mechanical strength, low impurity content and good vibration resistance. Graphite electrodes are good conductors of heat and electricity. Graphite electrode is widely used in steelmaking electric furnace, refining furnaces, production of ferroalloy, industrial silicon, yellow phosphorus, corundum , submerged arc furnaces and other smelting furnaces that produce high temperatures by electric arc.
According to the different of service power and electricity , using different raw materials and production technology, graphite electrodes can be divided into ordinary power (RP) graphite electrodes, HP graphite electrodes, ultra-high power (UHP) graphite electrodes.?

Application:

High power graphite electrode is mainly used in high-power electric furnace and ladle furnace.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar,?china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
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The working mode of moulding powder

Moulding powder forms ”three layers”?in the crystallizer, powder layer, sintered layer and slag layer. This working mode is the key to play the role of moulding powder.

The casting powder (1100~1200℃ melting point) on the surface of the molten steel (1500℃), heated by the molten steel and forms slag layer with 10-15mm thickness on the surface of molten steel. With the heat transfer slowed down, the moulding powder above slag layer sintered, forms sintered layer (900-600℃). And the casting powder above the sintered layer will gets fewer heat transfer, less than 500℃, so this is the powder layer. And the moulding powder covers in the molten steel surface evenly, to prevent cooling and secondary oxidation of molten steel.

During casting, the slag film between crystallizer and solidified slab shell could reduce the casting resistance and improve the heat transfer of crystallizer. As casting going , the slag layer is consumed constantly, then sintered layer becomes slag layer, powder layer becomes sintered layer, and adds more moulding powder into the crystallizer, makes the moulding powder keeps “three layers“.

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Reasons for mesh cracking of high alumina bricks

In addition, high alumina bricks on the surface of the network cracks generated in the gap between the brick brick surface. Therefore, it can be inferred that when the excess air coefficient in the kiln is small or the reducing atmosphere is generated, the CO is easy to be retained in these places due to the smaller slit, so that the Fe2O3 in the product is reduced to FeO; the surface of the channel is smooth , So it will not be affected by changes in the atmosphere, no network cracks. It is important to note that frequent changes in the nature of the combustion atmosphere should be avoided during the firing process. So that this alternating change will cause the surface to be damaged.
The chemical analysis of the surface and the central part of the products with high surface cracks in the surface of the high alumina refractory bricks shows that the Al2O3 on the brick surface is 1% -2% higher than the central part and the SiO2 is 1% -2% Center more than 10 times higher. It was found that the content of mullite was 12% lower than that of the central part, 4% -5% in corundum and 7% -8% in glass. This indicates that during the migration of Na2O, Na + volatilizes and adsorbs on the surface of high alumina brick, which will promote the decomposition of mullite, reduce the mullite on the surface of the product, and increase the corundum and glass phases. As the surface of the liquid phase increased and early appearance, so that the brick surface premature contraction, resulting in the production of reticulation.
Practice shows that in order to avoid and reduce the high aluminum brick surface network cracks, 1.2. High bauxite clinker water absorption were controlled at 4% -5% below, the tube of water absorption should also be controlled at 5.5 % Below, the excess air coefficient control between 1.1-1.2 is appropriate, so that high alumina brick firing in a stable weak atmosphere.
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How to distinguish the quality of high alumina bricks

High alumina brick is mainly used in lining of blast furnace, hot blast stove, furnace top, blast furnace, reverberatory furnace and rotary kiln. In addition, high alumina brick is also widely used as the open - hearth furnace, pouring system plug, water - mouth brick, etc.

It is featured by good quality, high refractoriness, long service life, and it is the most widely used by the industrial furnace. As the quality of it deters the service life of furnace, it’s very important to distinguish the prime and common one, the following can be referred to choose the good high alumina bricks.

Firstly, color is important for high alumina bricks, the prime one has smooth apprearance, it’s yellow white, the four sides are flat, with no broken corners and no cracks.

Secondly, it’s better to weigh, on average, the weight of the first grade is about 4.5kg and the second grade is 4.2kg, the third grade is 3.9kg.
In all, hope those is helpful to choose the prime generality high alumina brick as per your application.

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The reason of crack mesh high alumina brick

Changxing refractory shows the reasons for the high alumina refractory bricks to produce reticular cracks. It is reported that high alumina bricks often appear on the surface of the crack is the production of high alumina brick defects, the reasons for this network cracks often quite complicated. For example, the clinker content (especially R2O content), the amount of fine powder added, the critical particle size, the mixing quality of the clay, the humidity and the temperature of the green body, the shrinkage of the green body during the firing, Mulli petrochemical reaction and corundum recrystallization, etc., will lead to the surface of the refractory product produced reticulate. The sintering of high alumina brick is liquid phase sintering, the formation temperature of liquid phase and the amount of liquid phase, the firing conditions of the atmosphere is also an important factor in the surface network cracks.
The sintering degree and firing atmosphere of high alumina bricks and the volatiles present in the gas phase have a great influence on the surface crack of high aluminum products. Sintered bad clinker in the process of burning products continue to shrink, causing the product cracking and crack; at the same time sintering bad clinker, the second Mulli Petrochemical is not sufficient, in the process of burning products, clinker itself Mullerite is still continuing, which is caused by inconsistencies in the product of an internal factor, resulting in the number of products increased the number of cracks and the increase in the degree of cracking.
High-aluminum refractory products on the surface of the degree of mesh cracking with the clinker used in the water absorption is closely related. The greater the water absorption of clinker, the greater the degree of reticulation. When the clinker with the water absorption rate, the product in the firing process clinker itself to continue to complete the sintering process, products shrink larger, and uneven, and thus prone to cracking and reticulation. In addition, the firing atmosphere of the kiln is one of the causes of the network cracks in the high aluminum products. When the high aluminum products are fired, the atmosphere of the kilns is weakly oxidized and the excess air coefficient is controlled at 1.1-1.2. The practice shows that the surface cracks Excess air coefficient increases and decreases, but the excess coefficient of air fluctuations should not be too large.
Changxing refractory are mainly producing high alumina brick, high alumina refractory bricks, alkali resistant brick, castable, clay brick, insulation brick, light high alumina brick, low creep high alumina brick, high aluminum wear Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please contact us anytime.
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The high temperature compressive strength of the refractory fire bricks

The high temperature compressive strength of the refractory brick china (abbreviated as HCS) refers to the maximum pressure (in MPa) per unit area of the material at high temperatures above 1000-1200 °C. The compressive strength of the refractory material generally varies with increasing temperature. From the normal temperature from the temperature rise, the intensity of a straight line down. Since then, some of the material continues to decline with increasing temperature; some materials rise as the temperature rises to a certain extent and rises to a maximum temperature at a specific temperature, followed by a sharp drop. The following figure is a number of commonly used china refractory brick high temperature compressive strength with temperature changes.
The change in the high temperature compressive strength of the refractory fire brick is controlled by changes in certain components, especially those in which the matrix or its bound phase occurs at high temperatures. In general, the sintered refractory raw material, which is entirely composed of crystal, is prone to plastic deformation due to its grain and grain boundaries at high temperature, especially when its loading speed is small, so that the strength decreases with the temperature reduce. When some of the crystal phase between the melting point at high temperature or the formation of melt, such as silica brick, clay brick and high alumina brick, the matrix is mainly composed of glass phase, with the temperature rise, the strength of such multi-phase material the microstructure decreases with temperature. When the temperature is further improved, due to the viscosity of the glass phase from brittle to toughness, so that the material between the particles more firmly, so that the strength was significantly improved. Then, as the temperature increases, the melt viscosity of the material decreases sharply, and the strength of the material decreases sharply.
Changxing refractory are mainly producing high alumina brick, high alumina refractory bricks, alkali resistant brick, castable, clay brick, insulation brick, light high alumina brick, low creep high alumina brick, high aluminum wear Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please contact us anytime.
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Methods to masonry of boiler castable

There are several methods could be taken, to protect the boiler castable from being destroyed during masonry.
(1) The balance of refractory castable and water is important, adding not too much or too little water.
(2) Blended castable should be used within 30 minutes, and please add it to the certain depth and length at a time.
(3) Mold of it could be demolished after the castable is strong enough. The load-bearing form should be demolished when the castable reaches 70% of the strength. In order to facilitate stripping, pouring all the mold before pouring surface should be coated with a layer of oil.
(4) After the boiler masonry to have enough natural drying period, so that most of the refractory layer of water can be precipitated.
(5) Before the oven, the furnace lining material must have a certain natural strength (enough safety period) to carry out. Oven principle "should not be short, should be slow should not be fast."
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks and other refractory products.
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Silicon carbide based refractory materials

Silicon carbide (SiC) is an artificial mineral, refractory raw materials for the silica and coke, 2000 ℃ above the high temperature electric furnace synthesis, silicon carbide refractory is divided into three categories: (1) plus clay and other oxide-bound products; (2 ) Nitride-bonded products; (3) the use of silicon carbide recrystallization, pressure molding self-bonding products. One of the most common application of clay bonding products, China is currently the production and use of this one.

Carbide as a binder of silicon carbide grade products containing SiC87%, refractoriness up to 1800 ℃, load softening point 1620 ℃. The silicon carbide products have some special properties that make it suitable for certain applications such as (1) its thermal conductivity is about 10 times higher than that of conventional refractory materials and is suitable for use as heat-conducting devices such as heat treatment furnaces Cover. Because of its good thermal conductivity, 1200 ℃ below a strong antioxidant, so the life than the metal cover long. According to the same reason, can also be used as heat exchanger components. (2) mechanical strength, good wear resistance, resistance to rapid cooling hot or good, so some of the roller furnace with it for easy to wear roller sets, the cost is lower than the heat-resistant steel. (3) larger than the resistance, can be used as electric resistance of the furnace.

We are mainly producing high alumina brick, high alumina refractory fire bricks, alkali resistant brick, castable, clay brick, insulation brick, light high alumina brick, low creep high alumina brick, high aluminum wear Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need contact us anytime.

Article Source: Silicon carbide
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Introduction of Calcium Aluminate

The calcium aluminate is also known as pre-melt refining slag or pre-fused alumina slag. The characteristics are as follows:
The chemical composition is uniform, the melting point is low, the melting speed is fast, and the smelting time can be shortened. No fluorine, no erosion furnace lining and ladle;
Free of hydrogen, nitrogen, carbon and other impurities, it is beneficial to improve the quality of steel.
In the case of deoxygenation, it is directly added to the bottom of the bag.The amount of the added weight is determined by the carbon content of the finished steel water, and is generally used for the combination of 4-6kg/1000kg steel.In the first quarter of the steel, the regular added manganese iron, silicon iron, aluminum;After the steel is added to the steel, the steel will be added to manganese and silicon iron, without adding other alloy and aluminum feed line. Using the product to deoxidize, the amount of carbon added (silicon carbide) can be reduced by 30-50%.
In the case of desulphurization, the amount of added in advance use is 1/3, but it must be added to the impact position of bottom steel flow.As the molten steel flows out, the side joins 2/3.Using 6-8kg/1000kg steel, the original sulfur content and the use effect of steel water are determined.
It is mainly used in LF furnace, open hearth furnace, converter ladle refining, remove impurity such as sulfur, oxygen in molten steel, reduce the harmful elements in the steel and the content of impurities, suitable for carbon steel, high carbon steel, high, low alloy steel.
There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information. Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.
Article Source: Thermal conductivity of refractory bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The details of magnesia carbon brick

Magnesia carbon brick is a refractory consisting of MgO at 80-85% or more, with magnesite as the main mineral. The raw material of Magnesia carbon brick is mainly magnesite, the basic component is MgC03, after high temperature calcination into sintered magnesite, and then broken into a certain size after sintering magnesia (also known as metallurgical magnesia). Magnesia is widely used as a furnace material, refractory ramming material, containing less magnesium magnesia, as the manufacture of refractory raw materials of magnesia fire brick. Natural magnesite resources are few, China's reserves and production rank the forefront of the world. Many countries that lack magnesite rely on magnesia made from seawater, and the cost is high.

Magnesia carbon bricks according to their different production processes, divided into two kinds of sintered magnesia and chemical combination of magnesia brick. Sintered magnesia is used to burn, the size of particles with the appropriate proportion of magnesia, adding brine (MgCl2 aqueous solution) and sulfite pulp waste as a binder, press molding, in the 1550-1650 ℃ high temperature firing. In the firing process, the impurities in the magnesite and the addition of liquid phase, the magnesia carbon brick bonded together. And the chemical combination of magnesia carbon brick is not through the firing process, the sintered magnesite according to the proportion of grain with a good amount, adding the right amount of mineralizer and binder, press molding, after drying is finished. Chemical combination of magnesia carbon brick strength is low, the performance is not as good as sintered magnesia, but the price is cheap, less than half the price of sintered magnesia. It is used in the performance requirements are not too high parts, such as heating furnace and soaking furnace bottom.

Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks and other refractory.

Article Source:Magnesia Carbon Brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Cooperation with European client

On 10th, October 2017 our company delivery another 30 tons ladle slide gates to one of our European customers again.

Since last year in June, we have built a long term cooperation with European company. After trail order testing and service supporting, now we supply 60 tons refractory products to them every month.

First we design products according to their furnace and casting condition, then ask engineers to help them to install and test products. Now we are developing more and more European customers, and supply them both refractory products and service.

Article Source:  Cooperation with European client
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Ordinary sintering magnesia brick production process

The firing process usually includes magnesia carbon brick crushing, grinding, grading, batching, mixing, molding, drying and sintering processes.

1) refractory raw material requirements. Chemical composition of sintered magnesia: MgO>87%, CaO = 2.5%, SiO2 = 5%, the appearance of brown or dark brown, dense crystal, good sintering, bulk the density is larger than 3.2g/cm3, igloss <0.3%, in order to ensure the product has good structure, control C/S<0.5.

2) particles should be considered with the most compact principle. The current domestic production of ordinary sintering magnesia brick has various forms according to the actual situation, some using mixed ingredients, the single sieve, the critical particle size 3mm or 2mm, some with three ingredients of 3 ~ 1mm, 1 ~ 0mm, <0.088mm also according to the actual size of refractory brick type and the critical particle size can be enlarged to 6mm, while using four or five ingredients. In order to improve the thermal shock resistance of products, may be appropriate to increase the critical particle size, or by increasing the large particle size. In order to improve the product load softening temperature and sintering, can be increased when the content of fine powder particles, reduce the upper limit.

3) Ingredients. In a factory three ingredients for example: 3 ~ 1mm, 40 ~ 50%; 1 ~ 0mm, 20 ~ 25%; less than or equal to 0.088mm, 30 ~ 35%. binder commonly used sulfite liquor or brine, adding amount of 4% ~ 6%, adding the waste brick, the general should be <20%.

4) Mixed. Usually, in the wet grinding machine in the order of operations: coarse grain - size - bond - fine powder, net mixing time of >15 minutes, mud water <3%, generally do not need trapped material.

5) The magnesia material for forming poor materials, easy molding, blank containing water less, at around 2.5%, low mud plasticity, should adopt high pressure molding, control body density >2.95g/cm3.

6) Dry. Make the body moisture <1%. if not high water content in the body, can take the natural drying, generally >24 hours. If using drying, it generally takes 8 to 12 hours should not be too high, the drying temperature, inlet and outlet temperature control, so as to avoid cracking.

7) Firing. In the heating process will change as follows: out of the water, the generation of liquid phase sintering, particle migration, solid phase reaction, recrystallization, and finally sintering. Strength is increased and the density increases. The firing temperature is generally 1500 to 1600 degrees centigrade.

Article Source: Ordinary sintering magnesia brick production process
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The details of high alumina brick

High alumina brick is containing Al2O3 more than 48% of aluminum silicate products. According to the different composition of minerals, high-quality refractory products are divided into corundum, mullite a just jade and silicon stone three categories. Corundum products, AI2O3 content of more than 95%, the basic mineral corundum (A12O3), raw materials for natural or artificial corundum, but also fused corundum products. The basic mineral of mullite-corundum is mullite (3A12O3.2SiO2), the rest is corundum and glass phase. Silica stone stone raw materials for the sillimanite (Al2O3 · SiO2), the basic minerals are mullite and glass phase. A large number of industrial applications are mullite and silicon wire stone high alumina brick. With the increase of Al2O3 content and the decrease of glass phase, the refractoriness and resistance to rapid cooling of the products are improved, and the resistance to slag resistance, especially for acid slag, is enhanced.
The main raw material of high alumina bricks is high bauxite, which contains minerals such as boehmite, boehmite and kaolinite. The bauxite is calcined and the minerals are converted to corundum and mullite crystals at different temperatures. And in the 1400-1500 ℃ temperature, corundum and quartz combined with the second mullite, crystal growth. In the high-aluminum clinker with soft raw clay as a binder. The production process of high alumina brick and clay brick is basically the same.

Most of the performance of high alumina brick is better than refractory fire brick, but the thermal stability is slightly lower than clay brick. With the different content of Al2O3, ordinary high alumina brick is divided into three grades: (LZ) -65, (LZ) -55, (LZ) -48.

As the main component of high alumina brick AL2O3 is an amphoteric oxide, acid and alkaline slag erosion can resist the erosion of iron oxide skin also have a certain resistance. It is often used to build the soaking furnace bottom, the lower furnace wall, the exhaust outlet at the vault, in the continuous heating furnace, the bottom of the furnace wall, burner brick, ceiling can be used high aluminum brick masonry. High aluminum bricks are also commonly used as lattice bricks, repairing thermal storage rooms.

High alumina brick in the industrial advanced countries, the proportion of total refractory materials is about 8-14%, China's high alumina bauxite rich resources for the development of high alumina brick to create favorable conditions.

Article Source: Generality High Alumina Brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The specification of refractory bricks

Refractory firebrick is aluminum silicate refractory material, with A12O3 and SiO2 as its basic chemical composition, according to A12O3 and SiO2 content ratio, this type of refractory material is divided into three kinds: semi-silica brick (A12O3 15 ~ 30%), Clay brick (A12O3 30 ~ 48%), high alumina brick (A12O3> 48%). Clay brick is one of the largest and most widely used, the output of the total output of refractory materials of about 60 to 70%.
Refractory brick raw material is calcined after A12O3 + TiO2 content of not less than 30% of the china refractory brick, alkali and alkaline earth metal oxides and iron oxide content should be as little as possible, generally about 5-7%. Fire resistance of refractory clay must be no less than 1580 ℃. Clay raw materials after calcination, broken, ingredients (adding soft clay as a binder), pressing molding, drying, firing and other processes, you can get finished refractory bricks.
Refractory firebrick is weak acid refractory. As the chemical composition of the larger fluctuations in the production methods are different, the difference in firing temperature, so that the nature of clay brick changes. Ordinary clay brick according to the composition of the content of Al2O3 is divided into (NZ) a 40, (NZ) a 35, (NZ) a 30 three grades. The refractory degree of clay brick is above 1600 ℃, but the starting softening temperature is very low, only 1250 ~ 1300 ℃, and the load softening start temperature and the final temperature (fflJ40% deformation temperature) interval is large, this interval is about 200 ~ 250 ℃. Clay brick is very important in this nature, it makes the clay brick, although not too high refractoriness, but still can be applied to many high-temperature thermal equipment. Clay brick quenching and cooling is better, at 850 ℃ water cooling up to 10 to 25 times. Clay brick can resist weak acid slag erosion, little resistance to alkaline slag, increase the content of Al2O3, can improve the ability of alkali-resistant slag.
The refractory firebrick is rich in raw materials, the manufacturing process is simple and the cost is the lowest, and it is widely used in the furnace, flue, chimney, waste heat utilization device and burner of various heating furnaces and heat treatment furnaces. Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks and other refractory.
Article Source: fire brick for sale
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The specification of mullite castable

Mullite castable is to high-quality porous mullite aggregate as refractory raw materials, plus fine powder and additives into the mixture. Mullite aggregate critical particle size of 12mm; long-term use of the temperature of 1350 degrees. Changxing refractory also offer mullite insulating firebrick and  other refractory products.
Features:
Mullite pouring material using high temperature, can be directly exposed to the flame for the use of refractories working lining to achieve high temperature energy saving; unit capacity light weight, structural weight to reduce 40 ~ 60%, to eliminate the roof hanging fire brick fracture; low thermal conductivity, to the stone aggregate ingredients, low thermal conductivity, good insulation properties; can quickly oven, shorten the oven duration, significant economic benefits;
Applications:
Mullite Castable for the petrochemical industry tubular heating furnace, light diesel oil, ethane cracking furnace lining, atmospheric pressure reducing furnace, sulfur recovery device, steam boiler, tortoise net insulation layer, two barrels and pipe insulation single Layer, other industrial furnace door, see the fire hole, observation hole door lining and so on.
We are mainly producing high alumina bricks, high alumina refractory fire brick, alkali resistant bricks, refractory bricks, clay tiles, insulation bricks, light high alumina bricks, low creep high alumina brick, high aluminum wear Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please call our service hotline.
Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks and other refractory.
Article Source: fire brick for sale
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Physical and chemical index of Low creep high alumina brick

Low creep high alumina brick is a special bauxite clinker as the main raw material, supplemented by special additives, high pressure molding, high temperature firing, with thermal storage capacity, small creep rate, etc., suitable for small and medium blast furnace Matching hot air stove.
Creep high alumina bricks physical and chemical indicators
Specifications DRL-135 DRL-145 DRL-150 DRL-165 DRL-155 DRL-150
Al2O3,% ≥ 70 75 80 65 55 48
Refractoriness, ℃ ≥ 1790 1790 1790 1790 1770 1750
Apparent porosity,% ≤ 20 20 19 24 24 24
Normal temperature compressive strength, MPa ≥ 65 70 80 49 44.1 39.2
The rate of change of the burner,% ≥ ± 0.1 ± 0.1 ± 0.1 + 0.1 ~ -0.4 + 0.1 ~ -0.4 + 0.1 ~ -0.4
1450 ℃ x2h 1500 ℃ x2h 1450 ℃ x2h
0.2MPa load softening start temperature, ℃ ≥ 1500 1550 1650 1500 1470 1420
High temperature creep rate,% ≤ 0.6
1350 ° C × 50 h 0.6 0.7
1450 ℃ × 50h 1500 ℃ × 50h
We are mainly producing high alumina bricks, high alumina refractory fire brick, alkali resistant bricks, refractory bricks, clay tiles, insulation bricks, light high alumina bricks, low creep high alumina brick, high aluminum wear Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please call our service hotline.
Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks and other refractory.
Article Source: high alumina brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/