Light fire brick for permanent layer and preparation method of light fire brick

Abstract

The invention discloses a light fire brick for a permanent layer. The light fire brick is prepared by uniformly mixing the following components in parts and performing machine pressing: 10-20 parts ofmullite hollow spheres having the granularity of 3-5mm, 20-45 parts of mullite hollow spheres having the granularity of more than or equal to 1mm and less than 3mm, 6-14 parts of alumina hollow spheres having the granularity of 0.1-1mm, 6-30 parts of fused alumina or sintered alumina granules having the granularity of 0.1-1mm, 6-50 parts of mixed powder prepared from spinel powder, alpha-aluminapowder and fused alumina or sintered alumina powder according to a ratio of (4-10):(1-6):(1-30), and 5-12 parts of a binding agent. The light fire brick for the permanent layer, disclosed by the invention, has the advantages that the dried finished brick serves as the permanent layer of thermal equipment, the characteristics of a working layer such as high temperature resistance and erosion resistance and the thermal insulation effect of an outer layer are taken into account, the problem that the safety and thermal insulation of the thermal equipment are contradictory is effectively solved, problems that cannot be solved by the permanent layer of the conventional thermal equipment are solved, and the light fire brick achieves excellent effects during actual application and has considerablemarket prospects.

Description

technical field [0001] The invention relates to refractory materials, in particular to a lightweight refractory brick for permanent layers of high-temperature equipment such as electric furnaces, ladles, ladles, and torpedo tanks. Background technique [0002] Furnace walls of thermal equipment such as ladles, ladles, torpedo tanks, and electric furnaces generally include an outer insulation layer, a permanent layer and an inner working layer. The internal temperature of the equipment is relatively high during operation, and the highest temperature can reach about 1700°C. When the equipment works continuously, the working layer will be corroded by molten steel or molten iron, so when the working layer is used for a certain number of times, it must be offline for maintenance, which requires that the working layer must have a certain safety thickness. Since it is difficult to specify and grasp the specific size of the safety thickness in actual production, and due to various ...

AI Technical Summary

Problems solved by technology

Although the traditional permanent layer castable has good thermal insulation performance, its safety is poor, and it is easy to cause leakage accidents, and the use of magnesia carbon bricks made of the same material as the working layer as the permanent layer brick has extremely poor thermal insulation performance.

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