Mullite fiber refractory casting material

Abstract

The invention discloses a mullite fiber refractory casting material which comprises the following components in parts by weight: 10-20 parts of coarse aggregate, 30-35 parts of medium aggregate, 15-20 parts of fine aggregate, 5-10 parts of a binding agent, 5-10 parts of silica micro powder, 10-15 parts of alumina micro powder and 5-10 parts of yttrium oxide, wherein the coarse aggregate comprises mullite and zirconium oxide fiber; the medium aggregate comprises flint clay, silicon carbide and zircon; the fine aggregate is mullite. The binding agent comprises the following components in parts by weight: 20-40 parts of magnesium silicate and 80-60 parts of phosphate.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a mullite fiber refractory castable. Background technique [0002] The castables used in the kiln head cover of the existing domestic new dry-process cement production line are high-alumina materials. Although the castables of this material have high strength and good wear resistance at high temperatures, high-alumina materials form at high temperatures. The main mineral phase is corundum. The corundum phase is easy to react with alkali at high temperature, resulting in volume expansion, deformation, stress concentration, and cracks and peeling of the lining. Due to the constant scour of heated clinker at the kiln hood in the rotary kiln system, coupled with frequent changes in thermal parameters, the service life of the refractory material on the top of the kiln hood is generally short, usually about one year, which seriously affects the entire kiln. sy...

AI Technical Summary

Problems solved by technology

[0002] The castables used in the kiln head cover of the existing domestic new dry-process cement production line are high-alumina materials. Although the castables of this material have high strength and good wear resistance at high temperatures, high-alumina materials form at high temperatures. The main mineral phase is corundum. The corundum phase is easy to react with alkali at high temperature, resulting in volume expansion, deformation, stress concentration, and cracks and peeling of the lining.

Due to the constant scour of heated clinker at the kiln hood in the rotary kiln system, coupled with frequent changes in thermal parameters, the service life of the refractory material on the top of the kiln hood is generally short, usually about one year, which seriously affects the entire kiln. system operating rate