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

Abstract

The invention provides a corrosion-resistant microporous mullite light-weight refractory brick, which comprises a refractory brick base and a high-temperature resistant coating coated on the surface of the refractory brick base; wherein, the raw materials of the refractory brick base include: 20% to 30% of large tolite particles, 15% to 25% of small andalusite particles, 13% to 24% of metakaolin ultrafine powder, 5% to 10% of bound clay, 0.5% to 1.5% of expanded graphite, and fly ash 15% to 20%, hollow glass microspheres 3% to 6%, and the balance is pulp water; the raw materials of the high temperature resistant coating include: silica aerogel 65% to 70%, yttrium oxide gel 15% ~ 17%, nano silicon nitride 5% ~ 10%, potassium hexatitanate whisker 1% ~ 3%, and the balance of ethanol is ethanol. The invention also provides a preparation method of the corrosion-resistant microporous mullite light refractory brick, which has simple steps and is easy to produce automatically.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a corrosion-resistant microporous mullite 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 3...

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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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