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

A technology of aluminum chrome bricks and zirconium boride, applied in the field of aluminum chrome bricks, can solve the problems of surface layer peeling, thermal erosion, etc., and achieve the effect of improving the thermal erosion resistance.

Pending Publication Date: 2021-07-30
张福生
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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, silico

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specific Embodiment approach

[0025] Specific implementation: Zirconium boride doping improves the high temperature corrosion resistance of aluminum chrome bricks by utilizing the excellent high temperature resistance of zirconium boride itself and its chemical reaction with alumina and chromium oxide in bricks at high temperatures. .

[0026] The melting point of zirconium boride is 3200°C. When used as a metallurgical furnace lining, it can be used as a skeleton to effectively improve the high-temperature strength of aluminum-chrome bricks. erosion rate.

[0027] In addition to the high temperature resistance of zirconium boride itself, zirconium boride also improves the thermal erosion resistance of aluminum chrome bricks by chemically reacting with the surrounding medium. Zirconium boride doped with aluminum chrome bricks can chemically react with other oxides in the bricks to form zirconia and boria.

[0028] The newly formed zirconia can be combined with alumina to form zirconium corundum, and the ...

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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...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/10C04B35/622
CPCC04B35/66C04B35/10C04B35/622C04B2235/3241C04B2235/3272C04B2235/3418C04B2235/3208C04B2235/3206C04B2235/3201C04B2235/404C04B2235/447C04B2235/3813C04B2235/96C04B2235/9607
Inventor 张福生
Owner 张福生
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