Novel alumina bubble brick

Abstract

The invention belongs to a refractory material and relates to a novel alumina bubble brick. The novel alumina bubble brick comprises, by weight, 97-98% of Al2O3 with particle size of 1.5-8mm and spontaneous stacking density of 0.7-1.0g / m<3>, 2-1% of SiO2 with particle size of 1.5-8mm and spontaneous stacking density less than 0.6g / m<3>, and 1% of calcium carbonate with spontaneous stacking density less than 0.2g / cm<3> and corresponding density of 1.2-2.0g / cm<3>. The novel alumina bubble brick has high chemical component purity, low impurity content and low Si content. The novel alumina bubble brick is free of the traditional method for preparing a mullite bonding phase by specifically introducing SiO2, effectively reduces SiO2 content, improves a material use temperature, has high strength, can satisfy kiln building and use requirements and can guarantee coal water slurry vapourizing furnace normal operation.

Description

technical field [0001] The invention belongs to refractory materials, in particular to a novel alumina hollow ball brick. Background technique [0002] High-purity alumina hollow ball bricks are widely used in high-temperature kilns in the petrochemical industry because of their high alumina content, low bulk density, high-temperature strength, high operating temperature, low thermal conductivity, and energy saving. Thermal insulation material, also can be used as lining material for high temperature work. [0003] The main crystal phase of alumina hollow ball bricks is corundum phase. If the purity is too high, there will be no liquid phase formation, which will make its sintering very difficult. Therefore, the traditional production of alumina hollow ball bricks is to properly introduce a certain amount of silica ( Add silica powder or clay), through the reaction of silica and alumina in the firing process to generate mullite phase in the matrix, form mullite combination ...

AI Technical Summary

Problems solved by technology

[0003] The main crystal phase of alumina hollow ball bricks is corundum phase. If the purity is too high, there will be no liquid phase formation, which will make its sintering very difficult. Therefore, the traditional production of alumina hollow ball bricks is to properly introduce a certain amount of silica ( Add silica powder or clay), through the reaction of silica and alumina in the firing process to generate mullite phase in the matrix, form mullite combination to obtain sintering, and generate strength, but this method directly leads to the increase of silicon content, At the same time, the service temperature of alumina hollow ball bricks will also drop