Silica Bricks

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Silica has seven crystallization type variation and an amorphous type variant.These variations can be divided into two categories: the first kind of variation is quartz, scales, quartz and cristobalite vary their crystal structure, transformation between each other slowly,The second variation is the variation of subspecies ─ ─ alpha, beta, and gamma type their structure similar to that of mutual transformation between faster.In theory, the mutual transformation relationship between them is shown in figure 1.
Silica brick
Raw materials for manufacturing of silica brick of silica.Silica raw materials of SiO2 content is higher, the higher refractoriness.The most harmful impurity is Al2O3, K2O and Na2O, they severely reduce refractoriness of refractory products.Silica brick with SiO2 content not less than 96% of silica as raw material, adding mineralizer (such as iron scales, lime milk) and bond (e.g., molasses, sulfite pulp waste liquid), the mixing, molding, drying and firing practice etc.
Silica acid refractory material, has good resistance to the ability of acid slag erosion, refractoriness under load is as high as 1640 ~ 1670 ℃, long-term use of volume is stable at high temperatures.
Composed mainly of silica scales, quartz and cristobalite and a small amount of quartz and glass.Scale quartz, stones and residual quartz for crystal structure change in low temperature, the volume has great change, so the silica brick under the low temperature thermal stability is very poor.In use process, under 800 ℃ to slow heating and cooling, so as to avoid cracks.So should not be under 800 ℃ temperature leaps of kiln.The microstructure of coke oven silica brick as shown in figure 2.
Silica brick
Processes on the properties of silica brick and crystal transformation has close relationship with SiO2, therefore, true proportion of silica is an important quality index.General requirements under 2.38, the high quality silica brick should be below 2.35.Is the proportion of small, reflected in the brick scale number, quartz and cristobalite small amount of residual quartz and residual small linear expansion, thus less use of strength.
Silica brick is mainly used for laying the partition of the coke oven of coking chamber and combustion chamber, glass tank furnace kiln top, pool wall, calcining kiln of silicate products.Modern large-scale coke oven, in order to improve the production capacity, need thinning coke oven of coking chamber and combustion chamber wall, thus requiring the use of high density and high thermal conductivity silica brick.

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Q:Why is the three oxidation of two silicon is very harmful impurities in silica brick
Can generate the material needs is the best way to see the impurity problem!! the first consideration is whether can get the material impurities with what method choice after the time! Miscellaneous reactions cannot have new impurity formation! Selected cannot and need material reaction reagent!
The silica mineral phase is mainly composed of tridymite and cristobalite, there is a small amount of quartz and glass. Tridymite and cristobalite and quartz remaining at low temperature due to phase change, volume changes greatly, so the brick thermal stability at low temperature is very poor. In use, under 800 degrees Celsius, slowly heating and cooling, so as not to produce cracks. The use of temperature in blast furnace so should not be below 800 DEG on.
Q:Which material is good for furnace refractory?
Neutral refractory is mainly composed of alumina, chromium oxide or carbon. Corundum products containing more than 95% of alumina are a kind of high quality refractory materials with a wide range of uses. Chrome brick with chromium oxide as its main component has good corrosion resistance, but its thermal shock resistance is poor, and its deformation temperature is lower at high temperature. Carbon refractories with carbon bricks, graphite and silicon carbide products, low coefficient of thermal expansion, high thermal conductivity, good thermal shock resistance, high strength, resistance to acid and salt corrosion, especially weak acid has good resistance, without wetting of the metal and slag, light. It is widely used as lining material of high temperature, and also used as lining of autoclave in petroleum and chemical industry.
Q:The brick is mainly used in the place?
Open hearth furnace regenerator and a sediment chamber, soaking furnace, glass furnace refractory materials and ceramic brick kiln, kiln vault and other load-bearing parts.
Q:The formula in the refractory brick, and firing curve, who knows?
By silica powder, 81-85%, perlite 15-19%, plus the total weight of the main raw materials of the following accessories
Q:How much is the highest melting point of silicon?
Acidic silica brick refractories, softening temperature is as high as 1640 to 1670 DEG C, in the long-term use volume is relatively stable under high temperature. More than 94% silica content.
Q:Why is the highest brick coke oven temperature measuring point temperature not exceeding 1450
Brick belongs to refractory materials, with strong resistance to acid slag or acid solution erosion ability, high load softening temperature are excellent properties of silica brick, usually 1640-1680 C.
Q:The difference between clay refractory bricks and refractory brick in the application.
Clay brick features good thermal shock resistance and low price, but high temperature performance is not well integrated, and the long-term use temperature is not higher than 1300 degrees. It is widely used in low temperature parts of various kilns.
Q:The difference between clay refractory bricks and refractory brick in the application??
The ability of alkali resistance is poor, the thermal shock stability is the worst, and it is scrapped at one time. The brick is generally used in the coke oven, glass kiln. Other industries basically do not use.
Q:How to improve the thermal conductivity of the coke silicabrick rate?
To improve the thermal conductivity of silica brick for coke oven rate method:Manufacture of high density and high thermal conductivity of silica brick, adding additives such as CuO, Cu2O, TiO2, Fe2O3, (FeO), can improve the thermal conductivity of silica brick.

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