Lightweight anorthite microporous refractory aggregate and preparation method thereof

Abstract

The invention relates to lightweight anorthite microporous refractory aggregate. The lightweight anorthite microporous refractory aggregate is prepared by the steps of mixing and ball-milling kaolin, bauxite, silica powder, limestone and calcium hydroxide, adding dextrin, sintering and crushing. In the prepared refractory aggregate, the main phase is anorthite; in the presence of the anorthite phase, the aggregate has the characteristic of high stability when being used in the reducing atmosphere environment; the starting material has high purity and the mixed impurity components are small, so that the anorthite phase content of the finally obtained product is high, and the product has small shrinkage deformation and high high-temperature volume stability and contributes to maintenance ofthe whole structure of industrial kiln furnace wall lining; materials are ground and prepared, so that the materials are dispersed uniformly and have small granularity; and the air holes in the aggregate have small aperture which is micro-scale and have closed spherical structures, so that microporous aggregate has low thermal conductivity coefficient and high strength.

Description

technical field [0001] The invention relates to a lightweight microporous refractory aggregate used in the field of refractory materials, in particular to a lightweight anorthite microporous refractory aggregate 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 castable...

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 material 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.