High-strength hot-blast stove high-alumina checker brick and preparation process thereof

Abstract

The invention relates to the technical field of hot-blast stove checker bricks. The invention discloses a high-strength hot-blast stove high-alumina checker brick. The high-strength hot-blast stove high-alumina checker brick comprises the following raw materials in parts by weight: 10 to 20 parts of high-alumina bauxite with a particle size of 3 to 5 mm; 20 to 30 parts of andalusite with a particle size of 1 to 3 mm; 15 to 20 parts of corundum with the granularity of 0 to 1mm; 5-10 parts of an aluminum oxide raw material with a particle size of less than 0.088 mm; 10-20 parts of andalusite with the particle size being lower than 0.088 mm, 4-6 parts of activated aluminum oxide micro powder with the particle size being lower than 0.044 mm, 8-10 parts of corundum fine powder with the particlesize being lower than 0.044 mm and 5-8 parts of Guangxi white mud with the particle size being lower than 0.088 mm. The invention discloses the high-strength hot-blast stove high-alumina checker brick and a preparation process thereof. The preparation process comprises the following steps: adding a premixed fine powder matrix containing an aluminum oxide raw material, and stirring and mixing withweighed and proportioned raw materials; according to the method, the strength of green bricks can be improved, the defect rate of the green bricks in the transferring process is reduced, the production cost is reduced, the economic benefits are improved, the strength performance of the sintered high-aluminum checker brick is improved by 40%, and therefore the effect that the strength of the sintered high-aluminum checker brick is high is achieved.

Description

technical field [0001] The invention relates to the technical field of checker bricks for hot blast stoves, in particular to a high-strength high-alumina checker brick for hot blast stoves and a preparation process thereof. Background technique [0002] Checker brick for hot blast stove is a kind of heat-carrying heat storage body, which is characterized by good volume stability, excellent creep performance under high temperature load, high density and low porosity. A heat-carrying heat-storage body with many excellent thermal characteristics such as strong exchange capacity, large heat storage area, smooth ventilation, and low resistance. The function plays an extremely important role in the process of heating cold air into hot air. The use of checker bricks for hot blast stoves: checker bricks are mainly used on hot blast stoves. When the hot air is lower than 900°C, clay bricks are generally used. When the temperature is higher than 900°C, the checker bricks are made of ...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a high-strength hot blast furnace high-alumina checker brick and its preparation process, which has the advantages of high strength after sintering, and solves the problem that the current domestic blast furnace The regenerator of the hot blast stove is mainly porous checker bricks. Since the checker bricks have a porous structure, it is difficult to form and densify the structure, which leads to the problem of low strength of the high-alumina checker bricks after sintering.

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