Preparation method for novel aluminium oxide hollow ball brick

Abstract

The invention belongs to fire-proof materials, and particularly relates to a preparation method for a novel aluminium oxide hollow ball brick. The novel aluminium oxide hollow ball brick comprises the following components in percentage by weight: 97-98% of Al2O3, 2-1% of SiO2 and 1% of calcium carbonate, wherein the sum of the weight percentage of the components is 100%; the particle diameter of Al2O3 is 1.5-8 mm, and the natural stacking density of Al2O3 is 0.7-1.0 g / cm<3>; the particle diameter of SiO2 is 1.5-8 mm, and the natural stacking density of SiO2 is less than 0.6 g / cm<3>; the natural stacking density of calcium carbonate is less than 0.2 g / cm<3>; the corresponding density of the ball brick is 1.2-2.0 g / cm<3>. The ball brick is high in chemical component purity and low in Si content; the conventional method of specially forming mullite bonding phase by introducing SiO2 is avoided, the SiO2 content is effectively reduced, the strength is relatively high, the furnace construction and use requirements can be met, and the normal running of a coal-water slurry gasification furnace is ensured.

Description

Technical field [0001] The invention belongs to a refractory material, and specifically relates to a method for preparing a novel alumina hollow ball brick. Background technique [0002] High-purity alumina hollow spherical bricks are widely used in high-temperature kilns in the petrochemical industry due to their high alumina content, low bulk density, high high temperature strength, high use temperature, low thermal conductivity, and energy saving. It can be used as a partition Thermal insulation materials can also be used for high-temperature working lining materials. [0003] The main crystal phase of alumina hollow ball brick is corundum phase. If the purity is too high, no liquid phase will be formed, which will make it very difficult to sinter. Therefore, the traditional production of alumina hollow ball brick is to introduce a certain amount of silica into the ingredients ( Adding silica powder or clay), the mullite phase is formed in the matrix by the reaction of silica a...

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