A light-weight equal-diameter microporous corundum composite sphere and its preparation method

Abstract

The invention relates to a light-weight equal-diameter microporous corundum complex phase sphere and a preparation method thereof. The technical solution is: use 90-99wt% of Al2O3 micropowder and 1-10wt% of MgO micropowder as raw materials, add sugar polymers accounting for 5-15wt% of the raw materials, and mix them with a planetary ball mill; then add 60% of the raw materials ~20wt% water, rotary granulation, that is, prefabricated balls. Alumina sol and ρ-Al2O3 micropowder are mixed into a slurry according to the mass ratio of (0.04~0.1): 1, and then the slurry is evenly sprayed on the surface of the prefabricated ball, and the thickness of the slurry sprayed on the surface of the prefabricated ball is the same as The radius ratio of the prefabricated ball is (0.05-0.12): 1; dry and calcined in an ultra-high temperature shaft kiln at 1900-2100°C for 2-5 hours to obtain a lightweight equal-diameter microporous corundum composite ball. The light-weight and equal-diameter microporous corundum composite spheres prepared by the invention have the characteristics of low volume density, small average pore size, high closed porosity, low thermal conductivity, good thermal shock stability, strong erosion resistance and slag erosion resistance .

Description

technical field [0001] The invention belongs to the technical field of corundum refractory materials. In particular, it relates to a light-weight equal-diameter microporous corundum composite sphere and a preparation method thereof. Background technique [0002] Refractory materials are directly used in high-temperature industrial production processes in various fields of the national economy such as steel, nonferrous metals, cement, glass, ceramics, chemicals, machinery, and electric power. They are essential basic materials to ensure the operation and technological development of the above industries. In recent years, energy saving and consumption reduction have become one of the important directions of high-temperature industry, thermal insulation materials have been developed rapidly, and lightweight high-temperature industrial furnace linings have attracted more and more attention. However, refractory materials are not only furnace lining materials, but also participat...

AI Technical Summary

Problems solved by technology

Due to the low bulk density and more pores of the current lightweight refractory materials, compared with ordinary refractory materials, the slag diffusion channels are more, and the slag erosion process is more complicated

Therefore, lightweight refractory materials are required to have more micro-closed pores and the ability to form a slag-resistant protective layer under a wide range of slag composition conditions, but the lightweight materials currently reported are still difficult to meet the requirements