Refractory castable for rotary kiln mouth and kiln head hood

Abstract

The invention provides a refractory castable for a rotary kiln mouth and a kiln head hood. The refractory castable comprises the following components in parts by weight: 40-50 parts of aggregate, 25-40 parts of fine powder, 6-15 parts of oxide micro powder, 1-3 parts of binding agent and 2-2.5 parts of additives, wherein the aggregate is composed of 30 parts of special-grade alumina, 10 parts of corundum, 30 parts of mullite, 15 parts of andalusite and 15 parts of spinel; the fine powder is composed of 60 parts of zirconite powder and 40 parts of silicon carbide powder; the oxide micro powder comprises aluminum oxide micro powder; the binding agent is calcium aluminate cement in which the content of aluminum oxide is 80%; and the additives are composed of 30 parts of metal aluminum powder, 30 parts of organic anti-explosion fibers, 30 parts of sodium hexametaphosphate and 10 parts of heat-resistant steel fibers.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a refractory castable for a rotary kiln mouth and a kiln head cover. Background technique [0002] Compared with qualitative refractory products, unshaped refractory materials represented by refractory castables have the advantages of short process flow, low production energy consumption and cost, convenient use, wide application range, integrity and good use effect, so they are widely used in the world. It has developed rapidly, and its proportion in the whole refractory material is getting higher and higher. In some countries with advanced refractory technology, the output of unshaped refractories has approached or even exceeded the output of shaped products. For example, the current output of unshaped refractory materials in Japan accounts for about 60% of the total refractory materials; in the United States, it is about 50%; in Britain, Germany, Fran...

AI Technical Summary

Problems solved by technology

[0006] The refractory castables for the above-mentioned rotary kiln mouth and kiln hood are composed of 30 parts of super-grade bauxite, 10 parts of corundum, 30 parts of mullite, 15 parts of andalusite, and 15 parts of spinel; the aggregate is composed of zircon powder 60 parts, silicon carbide powder 40 parts to form a fine powder, and add alumina micropowder, calcium aluminate cement and add 30 parts of metal aluminum powder, 30 parts of organic explosion-proof fiber, 30 parts of sodium hexametaphosphate and 10 parts of heat-resistant steel fiber Composed of admixtures, this can make the mechanical strength, wear resistance and thermal shock resistance of the refractory castable achieve a better balance, so that the castable can obtain excellent comprehensive performance, and effectively solve the problem of the kiln mouth and kiln in front of the rotary kiln. The existing refractory castables for the hood are easy to wear, have poor thermal shock resistance or low strength, and have short service life.