Mullite refractory bricks and corundum mullite bricks have the advantages of high load softening temperature, low high temperature creep rate, and good thermal shock resistance. They are widely used in blast furnace hot blast stoves, glass melting furnaces, dry quenching and heating furnaces and other industries On the furnace. Mullite refractory refractory bricks are easily corroded by alkaline refractory bricks at high temperatures. In addition, at high temperatures, mullite can react with water vapor to generate Al2O3 and be damaged.
Therefore, mullite refractory bricks are not suitable for long-term use in environments with high alkaline slag and high water vapor content.
In addition to mullite and its composite refractory refractory bricks composed of corundum, mullite can also be combined with other materials to form refractory bricks to improve its performance, such as zirconium mullite refractory bricks, mullite-silicon carbide refractory bricks and so on. The so-called zirconium-mullite refractory bricks are mullite-zirconia composite materials. However, due to the high price of zirconia, zircon mullite clinker or refractory bricks are often prepared by reacting Al2O3 or alumina with zircon in actual production.
The manufacturing methods of such refractory bricks and raw materials include electric melting and sintering. Aluminum-zirconium-silica (AZS) refractory bricks made by electrofusion casting have been discussed in the electrofusion zirconia corundum bricks. The Al2O3 and ZrSiO4 ingredients are calcined to obtain zirconium mullite clinker, which is then crushed, kneaded, shaped and fired to obtain zirconium mullite refractory bricks, namely sintered AZS bricks.
Refractory bricks made with sintered or fused mullite as the main raw material can be made of mullite, part of mullite, and part of corundum. The former is called mullite refractory brick, and the latter is called corundum-mullite refractory brick or corundum mullite brick. The production process of mullite refractory bricks is the same as that of high alumina bricks. The ingredients are mixed, formed, dried and fired. The firing temperature is related to the composition of the ingredients, the purity of the raw materials and the requirements for the performance of refractory bricks, usually 1500-1700°C.
Mainly used for hot blast stove top, blast furnace body and bottom, regenerator of glass melting furnace, ceramic sintering kiln, dead corner lining of petroleum cracking system, etc.
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