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:The brick is mainly used in the place?
Partitions used in coking and combustion chambers for coke ovens
Q:Common bond brick?
When adding ingredients, the amount of lime added shall be converted to CaO, and the amount of addition varies depending on the product, usually fluctuating at 1.5~2.5%. For example, the production of coke oven silica brick, the dosage of CaO is 2.0~3.0%; the production of electric furnace top brick, the dosage of CaO is 1.4~1.75%.
Q:Can not use it two brick
Acidic silica brick refractory material, has good ability in acid slag erosion
Q:The specific content is what gb/t2608-2012 brick
The provisions of the brick classification, technical requirements, test methods,
Q:The introduction of silica brick
The silica mineral phase is mainly composed of tridymite and cristobalite, there is a small amount of quartz and glass
Q:Why will expand when heated brick
In the process of SiO2 drying, the four crystalline transformation points of 117, 163, 180~270 and 573 DEG C are found, among which the volume expansion caused by the 180~270 is the largest.
Q:High temperature refractory material?
Basic refractories in Magnesium Oxide and calcium oxide as the main component, the main products are magnesia brick, magnesia chrome brick, magnesia zirconia brick, magnesia brick, magnesia spinel brick, magnesia calcium brick, dolomite brick and the latest development of magnesia spinel brick and so on. With Magnesium Oxide (MgO) more than 80% of the refractory brick called magnesia brick,
Q:What is the effect of the content of silicon nitride in silicon nitride bonded silicon carbide brick on the use of electrobath? Thank you
The main damage of silicon carbide side wall brick is stress damage, not chemical erosion. Chemical damage is formed prior to the formation of the groove, and the damage to the chemical erosion is little after the formation of the groove.
Q:The production of brick, the ingredients of why join the waste brick?
Reduce crack production and improve yield. The amount of addition is related to the shape and weight of the brick. The bricks can be added to 20% weight less than 25kg; bricks above 25kg can be added to 30%; for the specific type of brick can be added 30%. into waste silica brick should pay attention to this problem
Q:The introduction of silica brick?
Brick refers to the content of more than 93% products SiO2. Brick with SiO2 content of not less than 96% of silica as raw materials, adding mineralizer and binder, through mixing, molding, drying, sintering and other processes in the system. The higher the content of SiO2 in silica raw material, the higher the refractoriness of the product. According to the use of brick varieties, divided into: coke oven silica brick, brick for hot blast stove, electric stove with brick, brick for glass furnaces. According to the transformation is divided into: standard bricks, tiles, bricks and general special brick etc..

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