Comparison of fused mullite bricks and fused corundum bricks
Date:2019-11-06 15:04 From:Zhengzhou Sunrise Refractory Author:admin
1. Fused mullite brick
The fused mullite brick is made of high alumina bauxite and the different bauxite is composed of mullite (3Al2O3·2SiO2, the mass fraction is: Al2O372%, SiO228%). It is melted at about 2300 ° C, cast in a sand mold at 1850 ° C, and then annealed to eliminate stress. The main crystal phases are mullite and corundum, and the glass phase is filled between the crystal phases. Its resistance to vitrification is stronger than sintered refractories, but not as good as other fused refractories. Adding a small amount (7% 8.5%) of zirconia can make the mullite crystals smaller, the brick structure dense, the mullite amount increased to 60% 70%, the glass phase content is relatively reduced, and the product is reduced. crack. The fused mullite bricks were gradually replaced by fused zircon bricks.
2. Fused corundum brick
The fused corundum brick is made of high-purity alumina and is introduced with a small amount of soda ash at 20002200 °C. The production process is similar to the production process of high aluminum products. There are fused α-corundum bricks, fused α, β-corundum bricks, and fused β-corundum bricks. The fused alpha-corundum brick is mainly suitable for melting borosilicate glass, opal glass and sulfate-containing melt. The fused α,β-corundum brick composition contains only a small amount of glass phase, does not ooze out when used, and has less pollution to the glass liquid. Direct contact with the glass liquid does not cause coloring of the glass liquid, and the corrosion resistance is good. Ideal material for kiln cooling chamber walls, kiln bottoms, and float glass furnace flow channels. The fused corundum brick is suitable for the upper structure of the furnace working pool and the combustion port at the rear of the melting zone and the vicinity of the chest wall, the small furnace flat and the like.
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