Corrosion-resistant microporous andalusite lightweight refractory brick and preparation method thereof

Abstract

The invention provides a corrosion-resistant microporous andalusite lightweight refractory brick. The refractory brick comprises a refractory brick matrix and a high-temperature resistant coating which coats the surface of the refractory brick matrix; the refractory brick matrix comprises the following preparation raw materials: 20%-30% of andalusite particles, 23%-30% of calcium aluminate fine powder, 19%-27% of metakaolin ultrafine powder, 3%-5% of aluminium oxide, 10%-18% of bonding clay, and the balance of paper pulp water; and the high-temperature resistant coating comprises the followingpreparation raw materials: 3%-6% of silicon carbide crystal whiskers, 20%-25% of silicon dioxide aerogel, 50%-60% of yttrium oxide gel, and the balance of water. According to the corrosion-resistantmicroporous andalusite lightweight refractory brick provided by the invention, uniformly-distributed micron-sized air pores are formed in the brick, and the brick has better thermal stability and higher refractoriness under load. The invention also provides a preparation method of the above corrosion-resistant microporous andalusite lightweight refractory brick. The method provided by the invention has simple steps and is convenient for automatic production.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a corrosion-resistant microporous andalusite lightweight refractory brick and a preparation method thereof. Background technique [0002] Refractory materials are widely used in metallurgy, petrochemical, glass and other high-temperature industries due to their good corrosion resistance to high-temperature media and their thermal insulation properties. As my country's emphasis on energy saving and consumption reduction continues to increase, more research and development has been done on lightweight refractory materials with good thermal insulation effects. Unshaped refractory materials have received special attention due to their advantages of convenient construction, low production cost, and good overall structure of the lining, among which refractory castables are the most widely used. [0003] The commonly used refractory castables are mainly Al 2 o...

AI Technical Summary

Problems solved by technology

[0003] The commonly used refractory castables are mainly Al 2 o 3 -SiO 2 However, when this type of refractory material is used in petrochemical and other industries, due to the influence of the reducing atmosphere environment, the damage of the refractory material will be aggravated, thereby reducing the service life of the material

In addition, due to the large size of pores in traditional refractory aggregates, the pore diameters are mostly at the millimeter level, so when the material is used in a high temperature environment, due to the intensification of radiation heat transfer and convective heat transfer through the gas in the pores, the refractory material will The thermal conductivity of the refractory increases, which in turn reduces the heat insulation effect of the refractory material, increases the loss of heat energy, and leads to an increase in energy costs

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