Refractories used in cement industry

Alkaline Refractories 
Alkaline refractory material is available for high temperature calcination,?also has superior chemical resistance property, which is a main material for cement kiln to keep high production quality, high yield, low consumption and long-term safe operation. Currently main material for cement kilns include direct-bonded magnesia chrome brick, semi-direct bonded magnesia chrome brick, ordinary magnesia chrome brick , dolomite brick, zirconium and zirconium-free special magnesite brick, spinel brick and chemically bonded unburned magnesia chrome brick.
Bricks properties are listed as follows:
High alumina brick
High alumina brick has high compressive strength, high refractoriness under load and good thermal shock resistance. Because of its low cost with high quality, it is widely used in varieties of cement kilns. When to be used in arch crown, calcined alumina brick is better.
High alumina bricks suitable for cement kilns include phosphate bonded alumina brick, phosphate bonded high alumina wear-resistant brick, anti-stripping alumina brick, chemically bound (special) alumina brick and general alumina brick and so on.

Alkali Brick Series
Alkali fire brick has excellent alkali corrosion performance, under certain conditions, it will react with the alkali compound kiln materials and kiln gas, rapidly forming enclosed type dense protective enamel layer on the turn, preventing the continuing internal mixing and bricks "base crack ", which is a indispensable kiln lining material in NSP kiln. This series bricks include ordinary alkali-resistant brick, high-strength alkali-resistant brick, insulation alkali-resistant brick and arch type alkali-resistant brick.
Series refractory castables 
Refractory castables can be produced with simple production process, which is flexible and convenient to be used in the cement kiln system. It has become increasingly common to be applied in the complex structure of cement kiln preheater system. Refractory castables suitable for cement kiln mainly include corundum castable, high alumina castable, alkali-resistant castables and light weight castable.
Article Source:Refractories used in cement industry
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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The specification of firebrick in gasification furnace

Clay refractory bricks as an important refractory, changxing refractory to tell you about clay refractory in the gasifier in the standard use, there have been some problems should be avoided?

Clay refractory bricks in the operation of the gasifier has also occurred in the oxygen load fluctuations, and sometimes oxygen regulator valve will cause changes in oxygen load, and sometimes large particles will suddenly stuck high pressure coal slurry pump valve, coal slurry flow suddenly caused by Oxygen is relatively excessive. Oxygen fluctuates directly after the furnace temperature fluctuations, oxygen fluctuations in the range of sometimes 500m3 ~ 600m3, the maximum reached over 1000m3 or so. Oxygen suddenly rose, resulting in a sudden rise in furnace temperature, will suddenly burn high temperature thermocouple, this situation on the clay refractory brick is great, should try to avoid. First of all, we all know that the furnace temperature on the life of the refractory lining is very important, so to strictly control not overheating. Under the normal production conditions, the clay refractory brick surface has a layer of cinder layer, in fact, slag is dynamic, low temperature slag thicker, high temperature slag thinner, suitable thick slag layer can slow down the high temperature gas and slag Scouring. The same time as
The above is on the clay refractory fire bricks in the gasifier in the standard use, hoping to bring you help. Is a professional refractory production enterprises, the company qualified, advanced equipment and experienced. Product quality is strict checks, deep products of our customers love. At present, the company produced refractory products are shaped bricks, high alumina brick, square brick, clay refractory bricks, we warmly welcome the needs of customers to visit the company to discuss and seek common development.

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. Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick, 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.

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The application and features of High Alumina Brick

Clay refractory brick is Al2O3 content of 30% to 40% of aluminum silicate material of clay products. Clay brick is 50% soft clay and 50% hard clay clinker, according to a certain size requirements for ingredients, after molding, drying, in the 1300 ~ 1400 ℃ high temperature firing. The mineral composition of clay brick is mainly kaolinite (Al2O3 · 2SiO2 · 2H2O) and 6% ~ 7% impurities (potassium, sodium, calcium, titanium, iron oxide). stick
The calcination process of tiles is mainly due to the process of crystallization of kaolinite (3Al2O3 · 2SiO2). The SiO2 and Al2O3 in the clay brick form an eutectic and low melting point silicate with the impurity surrounding the mullite crystals during the firing process.
Clay refractory bricks are weak acid refractory products, can resist acid slag and acid gas erosion, resistance to alkaline substances slightly worse. Clay brick thermal performance is good, resistance to rapid cooling hot.
Clay refractory firebrick degree and silica brick comparable, up to 1690 ~ 1730 ℃, but the load softening temperature is lower than the silica brick 200 ℃. Because the clay brick contains high refractory mullite crystals, but also contains nearly half of the low melting point amorphous glass phase.
In the temperature range of 0 ~ 1000 ℃, the volume of clay brick with the temperature rise and uniform expansion, linear expansion curve is similar to a straight line, linear expansion rate of 0.6% to 0.7%, only half of the silicon brick. When the temperature reaches 1200 ℃ and then continue to heat up, the volume will start to shrink from the maximum expansion. The residual shrinkage of the clay brick leads to the cracking of the masonry gray seam, which is a major drawback of the clay brick. When the temperature exceeds 1200 ℃, the clay in the low melting point material gradually melted, because the particles by the surface tension and rely on each other very tight, resulting in volume shrinkage.
As the clay refractory fire brick load softening temperature is low, at high temperature shrinkage, thermal conductivity than silica brick 15% to 20%, mechanical strength is also worse than the silicon brick, so clay can only be used for the secondary parts of the coke oven , Such as regenerative room wall, small flue lining brick and regenerator lattice brick, door lining brick, roof and riser lining brick.
Xinmi Changxing furnace refractory Tips: You may also on the refractory bricks, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.
Article Source: Generality High Alumina Brick and Clay Brick
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The operation instructions of converter furnace tap hole

1.The maintenance standard of tap hole
Please ensure there is no deformation of the tap hole and meets the requirement of slag stopping. Tap hole brick should be horizontal and its shape should be round.
The diameter of tap hole should be less than 140mm, the length should be more than 400mm. Tapping time should be more than 1 minute and 30 seconds, or it should be replaced.
2.The maintenance operation of tap hole
Before removing tap hole after using, use ring rolling machine to clean out the remaining sleeve and slags, if there is steel remaining, use oxygen lance.
Place the precasted tap hole bricks in from the outside, seal the outer gaps with filling material, after the filling material combined and beding hard, level the convertor, fill the inner gap with diluted Martin sand. Inner mouth should be slightly concave, after sintering for 5 mintues the convertor can be lifted.
3.Other matters need attention
The remaining steel and slad on the tap hole coat should be removed before changing shifts.
The remaining steel at the outer mouth of tap hole should be removed after each tapping.
Please ensure the shape of tap hole is round during using.
4.Make log sheet.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, refractory fire brick, ladle & tundish nozzle, ceramic fiber with high quality for you.
Article Source:The operation instructions of converter furnace tap hole
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The different uses of high alumina bricks

Clay refractory brick is Al2O3 content of 30% to 40% of aluminum silicate material of clay products. Clay brick is 50% soft clay and 50% hard clay clinker, according to a certain size requirements for ingredients, after molding, drying, in the 1300 ~ 1400 ℃ high temperature firing. The mineral composition of clay brick is mainly kaolinite (Al2O3 · 2SiO2 · 2H2O) and 6% ~ 7% impurities (potassium, sodium, calcium, titanium, iron oxide). stick
The calcination process of tiles is mainly due to the process of crystallization of kaolinite (3Al2O3 · 2SiO2). The SiO2 and Al2O3 in the clay brick form an eutectic and low melting point silicate with the impurity surrounding the mullite crystals during the firing process.

Clay refractory bricks are weak acid refractory products, can resist acid slag and acid gas erosion, resistance to alkaline substances slightly worse. Clay brick thermal performance is good, resistance to rapid cooling hot.

Clay refractory firebrick degree and silica brick comparable, up to 1690 ~ 1730 ℃, but the load softening temperature is lower than the silica brick 200 ℃. Because the clay brick contains high refractory mullite crystals, but also contains nearly half of the low melting point amorphous glass phase.

In the temperature range of 0 ~ 1000 ℃, the volume of clay brick with the temperature rise and uniform expansion, linear expansion curve is similar to a straight line, linear expansion rate of 0.6% to 0.7%, only half of the silicon brick. When the temperature reaches 1200 ℃ and then continue to heat up, the volume will start to shrink from the maximum expansion. The residual shrinkage of the clay brick leads to the cracking of the masonry gray seam, which is a major drawback of the clay brick. When the temperature exceeds 1200 ℃, the clay in the low melting point material gradually melted, because the particles by the surface tension and rely on each other very tight, resulting in volume shrinkage.

As the clay refractory fire brick load softening temperature is low, at high temperature shrinkage, thermal conductivity than silica brick 15% to 20%, mechanical strength is also worse than the silicon brick, so clay can only be used for the secondary parts of the coke oven , Such as regenerative room wall, small flue lining brick and regenerator lattice brick, door lining brick, roof and riser lining brick.
Xinmi Changxing furnace refractory Tips: You may also on the refractory bricks, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.

Article Source: Generality High Alumina Brick and Clay Brick
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The properties and damage factors of refractory material for aluminium making

Damage factors:
1.Melting temperature. The higher the melting temperature, the lower the viscosity of molten aluminium, which makes it easier to penetrate into the refractory material, that means molten steel is with higher erosiveness in high temperature;
2.Alloy type. The adding and adding quantity of alloys such as zinc, magnesium, silicon could affect the reaction ability of molten aluminium;
3.The using and type of agent of fusion. When using agent of fusion, the service life of refractory raw material will be shortened, the seriousness is differ by different type of agent of fusion;
4.Besides, the level of operation could also affect the service life of refractory material.
Properties:
1.Low porosity. When the refractory material is with lower porosity, less molten aluminium would penetrate into the pores and the reaction between them will be less;
2.The distribution of pore sizes. Small pores should be comparatively more, if the average pore radius is over 0.5-1μm, the erosion resistant performance of refractory material to molten aluminium will be remarkably reduced;
3.Choose the right refractory raw material and change the composition of minerals properly;
4.Add anti wetting agent;
5.High strength.
Article Source: The properties and damage factors of refractory material for aluminium making
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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International standard for the volume density of firebrick

China refractory brick is divided into ordinary clay refractory bricks, dense clay refractory bricks, high-density clay refractory bricks, silica bricks, magnesia carbon bricks, aluminum-magnesium carbon brick, the bulk density of different, some soft, and some hard.

According to the different types of raw materials used in the production of refractory bricks, the density of the refractory bricks china is different. The general refractory is measured at the factory before the bulk density and bulk density: the ratio of the mass of the dried product to its total volume, expressed in g / cm3 , The bulk density index is the main indicator of the degree of product density, high density, you can reduce the external slag and other invasive.

Ordinary clay refractory bricks are generally 1.8 ~ 2.0g / cm3, dense clay refractory bricks are generally 2.05 ~ 2.20g / cm3, high dense clay refractory bricks are generally 2.25 ~ 2.30g / cm3, silica bricks are generally 1.80 ~ 1.95g / cm3 , Magnesium bricks are generally 2.60 ~ 2.70g / cm3, aluminum and magnesium.
Carbon brick is generally 2.90 ~ 3.00g / cm3, the product of the bulk density index is the product volume and the composition of the comprehensive reflection of the composition of minerals, because it is easier to measure, in production is usually used as a means to determine the degree of sintering products.

We are mainly engaged in the production of refractory bricks, high alumina bricks, high alumina refractory bricks, alkali-resistant bricks, clay tiles, insulation bricks, light high alumina bricks, low creep high alumina bricks, Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please call our service hotline.

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Prevention and elimination of forging cracks (2)

Ultrasonic testing showed that the existence of cracks and pore defect of large forgings is an important cause of waste, most of which is due to internal blank there are loose, coarse grained inclusions, and cracks. They are due to the local inhomogeneous deformation, under great stress concentration and shear stress, which leads to the closure, compaction and the generation of deformation damage. Therefore, smelting of refractory raw materials, hot forging comprehensive control, cracks and eliminate the cause and condition is the effective measures to improve forging quality. However, for large forgings with inner crack defects have the healing repair, reopening to prevent scrap also has important economic significance.

The principleof crack repair: any structure and composition of heterogeneous refractory materials (including micro cracks), in the permit conditions, will tend to homogenization. Its essence is in force (diffusion concentration, electric field, stress field gradient) under the effect of diffusion and migration of metal atoms, the orientation of inner crack healing.

Now the application of high temperature diffusion treatment, pressure diffusion, diffusion and plastic deformation of the combination of healing methods. It have get obvious effect in the large tube plate, large module inclusion crack repair achieved remarkable results, and in the rolling steel tube, crack control.
The crack initiation and propagation in the forging process can be prevented and eliminated by using the internal crack repair mechanism effectively by means of the study and test method of hot forging crack, and combined with the microstructure and thermodynamic analysis of the forging cracks.
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:Prevention and elimination of forging cracks (2)
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Prevention and elimination of forging cracks (1)

The principle of preventing crack

1. There have many kinds of refractory products in our factory, such as fire brick china, refractory products, calcium silicate products, castable, etc. Chemical components of material should strictly comply with the standards of harmful elements,such as S, P, O, N, CU, AL and other easy to form inclusion elements and An, Sb and other trace elements should be controlled. For example: 1Cr18Ni9Ti austenitic stainless steel, because Ti content exceed the standard will lead to steel ferrite’s increases that caused by forging crack.
2. To strictly control the smelting and casting process. This is to improve the purity of steel, eliminate the metallurgical defects, an important link to prevent crack will occur. Practice has proved that the inclusions in steel and presents lumpy aggregation, coarse grain and grain boundary fragility and blank with micro crack and subcutaneous bubbles, cracks easily damaged.
3. When forging, it is necessary to maintain a good stress state, such as changing the free forging punching into die extrusion forming to improve the stress state, so as to prevent the formation of cracks.
4. Strictly control the deformation temperature. Low temperature hardening, serious plastic decrease; the temperature is too high, overheated, burning, plastic will fall, will be?likely to produce cracks. Only fully of recrystallization interval in softening, is generally a single organization, less possibility of forging crack.
5. Deformation rate has a great impact on the low plasticity material, should be based on the specific material selection of suitable forging equipment, in order to prevent the fracture, such as forged MB5 magnesium alloy in the hammer is easy to crack, and in the press forging is not cracked, the reason is the recrystallization of magnesium alloy under high speed slow, easy deformation and easily broken. Changxing refractory provides refractory products, calcium silicate products, castable & mortar, refractory fire brick, ladle & tundish nozzle, ceramic fiber with high quality for you.

Article Source:Prevention and elimination of forging cracks(1)
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The classification of complicated shape brick

Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick china, ladle & tundish nozzle, ceramic fiber with high quality for you. Refractory brick manufacturers suggest that special-shaped refractory bricks according to the preparation process can be divided into firing bricks, not burning bricks, fused brick (cast brick), fire-resistant insulation bricks; specific type of refractory bricks by shape and size can be divided into standard Brick, ordinary brick, and so on. Shaped refractory bricks can be used as high-temperature building materials and structural materials for building furnaces and various thermal equipment. Shaped refractory bricks can withstand various physical and chemical changes and mechanical effects at high temperatures. Such as refractory clay brick, high alumina brick, silica brick, magnesia carbon bricks and so on.

Special strength refractories bricks, its main feature is the early high strength, 3-7 days maximum room temperature compressive strength of up to 30MPa or more, the disadvantage is poor in the temperature volumetric stability, reduced strength, the maximum decline of up to 40%, so require room temperature Strength must meet the design and national standards requirements. The main factors that reduce the temperature strength are: low-calcium high-alumina cement of special-shaped refractory brick in the heating furnace oven heating process to a certain temperature (350 ℃ or so), the hydrate began to dehydrate, the hydration of cement stone structure, dense Degree and strength decreased, castable volume changes, then castable body strength dropped to the lowest point, then stabilized.

With the heating temperature rose to 1100 ℃, the cement stone gradually sintered, shaped refractory brick crystal began to convert mullite crystals. With the rising temperature, mullite crystals continue to grow, castable in the matrix glass phase was liquid state, the formation of high temperature ceramic sintered, the strength significantly improved. At about 1300 ℃, the strength of the special-shaped refractory brick body can reach more than 60MPa, which is a special characteristic of the special-shaped refractory bricks at high temperature.

Xinmi Changxing furnace refractory Tips: You may also on the refractory fire brick, magnesia carbon brick, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.

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
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Thermal conductivity of refractory fire bricks

Chinafirebrick provides refractory products, magnesia carbon brick， calcium silicate products, castable & mortar, fire brick china, ladle & tundish nozzle, ceramic fiber with high quality for you. Refractory fire bricks rely on convection and steady state heat transfer, in the middle of the high temperature furnace if there are two refractory bricks, and there are two different temperatures there is a temperature difference. There will be heat transfer process we call heat transfer.

Refractory tiles convection heat is due to the movement of the internal particles of the fluid, the heat of the refractory brick from one to another. In the furnace refractory tiles heat transfer often encountered, when the fluid and refractory brick wall contact with the heat to the refractory wall or heat from the wall to the phenomenon of fluid.

Conduction heat transfer, also known as thermal conductivity, thermal conductivity is dependent on the thermal movement of micro-particles and the heat from the refractory high temperature zone to the low temperature area, or from the high temperature refractory brick to contact with the low temperature refractory brick process. In the hot environment, the temperature field of the temperature distribution in the interior of the refractory bricks is changed from time to time to the steady state temperature field.

Heat transfer rate: refers to the unit time through the heat transfer surface heat transfer.Heat flux: refers to the unit time through the unit heat transfer surface heat. Heat flux, also known as heat density.

Steady state heat transfer
The heat transfer process at which the temperature of the points in the heat transfer system varies only with the position and does not change with time. The process of steady state heat transfer is characterized by a constant heat transfer rate through the heat transfer surface.

Non - steady state heat transfer
In the non-steady state heat transfer system, the temperature along the points not only changes with the position, but also changes with time. In general, the heat transfer process of the intermittent production operation is non-steady state heat transfer.
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
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Castables for reheating furnace

Heating furnace is used for rolling steel or forging steel billet or small steel ingot thermal equipment, the operating temperature below 1400 degrees. With the rapid development of refractory castables, more and more castables are used for reheating furnace, the most common used of them are as follows:.
(1) Self-flow castable
Applicable to the furnace structure is more complex, artificial can not vibrate the site. The maximum temperature of 1500 ℃, which is characterized by good thermal shock resistance, high refractoriness, construction is simple, almost no vibration.
(2) Refractory plastic
For the furnace roof, furnace wall face.
(3) Low cement castable
Applicable to the high temperature furnace, the temperature zone, the use of temperature between 1400 ~ 1500 ℃.
(4) Phosphate castables
It is suitable for the bottom of the furnace and other parts which are subject to friction and hot air scouring. The mixing degree is between 1000 and 1600 ℃. It is made of phosphoric acid or phosphate as the binder, aluminum cement and magnesite. A castable of a gelling agent.
(5) Mullite castable
High thermal shock resistance, erosion resistance, good corrosion resistance, good volume stability, high temperature, it is generally used in the furnace wall, roof and pressure beam and other key parts, or used to prefabricated burner brick.
(6) Anti-dry slag castable
It is suitable for the bottom of the furnace and the site where the iron oxide slag is deposited. The maximum temperature of up to 1600 ℃. Its main features are: high refractoriness, thermal shock resistance, and can be a good resistance to heating furnace iron oxide slag erosion.
(7) Light castable
Light castable for furnace wall, roof, flue and other parts of the insulation layer. High-strength lightweight castables can also be used as a working lining for smoke and hot air ducts.
Article Source:Castables for reheating furnace
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The application and requirements of refractory brick masonry

China refractory brick masonry construction, first of all, clear the construction tasks; secondly, do the "three check", that check personnel, check the material, check the scene; then, ready, remove the hidden dangers, reduce the problem; finally, In order to cope with possible accidents.

1. Careful analysis of drawings, a clear construction tasks, understand the design intent, to clarify the design requirements of each part and the main points.

2. Visit the design side, the supply side, the construction side, the application side of the leadership, to clarify the parties, the parties within the working relationship and organizational relations, the implementation of their respective responsibilities, clear what problems, who should solve. Changxing refractory to provide you with technical solutions.

3. Check the refractory raw materials, construction tools and auxiliary facilities into the site to confirm whether the varieties, specifications, quantity and quality meet the construction requirements. Whether the personnel and organizations involved in the construction meet the intended requirements.
Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick China, ladle & tundish nozzle, ceramic fiber with high quality for you.There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.
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