Method for preparing high-resistance alumina-chrome brick by doping zirconium boride

Abstract

The invention relates to a method for preparing a high-resistance alumina-chrome brick by doping zirconium boride. The method comprises the following steps of: 1, preparing the following raw materials in percentage by mass: 81% of Al2O3, 15% of Cr2O3, 0.75% of Fe2O3, 0.12% of SiO2, 0.32% of CaO, 0.4% of MgO, 1.25% of Na2O, 0.02% of K2O, 0.02% of Ti2 and 8% of Al (H2PO4) 3, matching the raw materials in proportion, and then adding 5% of ZrB2; 2, mixing the matched raw materials in a mixer for 1 h to achieve uniform distribution; 3, loading the uniformly mixed raw materials into a mold, and carrying out compression molding under a 150 Mpa hydraulic press; 4, drying a formed green body in a dryer for 24 hours so as to achieve the purpose of removing moisture; and 5, putting the dried green body into a sintering furnace, and sintering the green body at the temperature of 1500 DEG C for 1 hour in an oxidizing atmosphere at the sintering temperature of 1500 DEG C, heat preservation time being 1 h.

Description

technical field [0001] The invention relates to the field of aluminum-chrome bricks, in particular to a method for preparing aluminum-chrome bricks with high resistance to iron by doping zirconium boride. Background technique [0002] Aluminum-chrome bricks are made of high-alumina bauxite, which is added to chromite ore or a by-product of a ferroalloy plant—aluminum-chromium slag. After reasonable particle size distribution, water and pulp waste liquid are added to a wet mill for mixing. The refractory products formed on the brick machine and then sintered at high temperature after drying are widely used in non-ferrous metal melting furnaces and glass furnaces because of their low manufacturing cost and excellent corrosion resistance and thermal shock resistance. [0003] The raw material used in the preparation of aluminum-chrome bricks is mainly aluminum-chromium slag, which comes from the waste slag obtained from the smelting of metal chromium by the aluminothermic metho...

AI Technical Summary

Problems solved by technology

[0008] Aluminum-chrome bricks prepared with aluminum-chromium slag as the main raw material, during use, the chromium oxide or aluminum oxide in the brick easily reacts with iron oxide, calcium oxide, silicon oxide, etc. in the slag to form a low melting point eutectic or Compounds can easily cause the surface layer of bricks to fall off, and severe thermal erosion will occur under the scouring of liquid metal