Alumina bubble lightweight insulating refractory casting material

Abstract

The invention discloses an alumina bubble lightweight insulating refractory casting material, which comprises the following components in percentage by weight: 10 to 50 percent of alumina bubbles, 5 to 15 percent of mullite with the grain diameter of 5 to 3 millimeters, 5 to 20 percent of mullite with the grain diameter of 1 to 3 millimeters, 10 to 20 percent of mullite with the grain diameter of 0 to 1 millimeter, 1 to 13 percent of swelling agent, 10 to 25 percent of fine powder, 10 to 20 percent of micro powder, 0.1 to 1 percent of water reducing agent and 5 to 20 percent of composite aluminate cement. The casting material has the characteristics of carrier weight reduction, high temperature resistance, good heat insulation effect, large strength, convenient and practical operation, and suitability for being used at the temperature of between 1,000 and 2,000, can be used for integrally casting, spraying, coating and repairing, and not only meet the requirement of smelting special steel, but also meet the requirements of refractory materials for hot-blast stoves, furnace tops, furnace walls, petrochemical cracking furnaces, systems for chlorine and sulfur removal, slag discharge and catalytic cracking, electric fluidized bed boilers, flues and the like.

Description

technical field [0001] The invention relates to a refractory material, in particular to a high-temperature-resistant, heat-insulating and anti-corrosion aluminum oxide hollow sphere lightweight heat-insulating refractory castable, which belongs to the preparation technology of amorphous special refractory materials in the field of inorganic non-metallic materials. Background technique [0002] With the development of science and technology, traditional refractory materials can no longer meet the technical requirements of pyrometallurgy under special circumstances. In particular, ladles, tundishes, ladles, heating furnaces in the iron and steel smelting industry and high-temperature furnaces in the petrochemical field have stricter requirements on refractory materials, such as smelting special steel, alloy semiconductor materials, high-performance silicon steel sheets and other steels. The temperature is as high as 2000°C. Using ordinary magnesia-carbon bricks, high-alumina b...

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Problems solved by technology

[0002] With the development of science and technology, traditional refractory materials can no longer meet the technical requirements of pyrometallurgy in special environments

In particular, ladles, tundishes, ladles, heating furnaces in the iron and steel smelting industry and high-temperature furnaces in the petrochemical field have stricter requirements on refractory materials, such as smelting special steel, alloy semiconductor materials, high-performance silicon steel sheets and other steels. The temperature is as high as 2000°C. Using ordinary magnesia-carbon bricks, high-alumina bricks, and high-silicon bricks has a large thermal conductivity. The red envelope phenomenon will appear in a ladle full of molten steel and a steel drum shell in a short period of time, which is too dangerous. The safety standard cannot be met; once the intermittent time is too long, the temperature of the molten steel in the ladle and the steel ladle will drop sharply again, and the phenomenon of freezing the ladle will occur

Therefore, it is required that new refractory materials should have the characteristics of fracture resistance, creep resistance, oxidation resistance, slag invasion resistance, corrosion resistance, thermal shock resistance, low thermal conductivity, light volume and long life under high temperature conditions. Ordinary silicon-aluminum refractory castables for lining materials can no longer meet the above requirements. Ordinary silicon-aluminum refractory castables not only have the disadvantages of high bulk density, high thermal conductivity, high iron content, large heat loss and low service life, but also have the disadvantages of high heat loss and low service life. It will also produce a lot of waste and pollute the environment, which does not meet the requirements of energy conservation and environmental protection, and has not adapted to the needs of the growing domestic and foreign markets.

Especially in recent years, the light heat insulation, high refractory, high strength high-performance silicon-alumina refractory castables urgently needed in the international market (requires high temperature resistance up to 1850 ° C, bulk density ≤ 1.56, Fe 2 o 3 ≤0.3%) There is no manufacturer to develop and produce

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