Pouring material for cement kiln tertiary air duct

Abstract

The invention relates to a pouring material for a cement kiln tertiary air duct. The pouring material comprises aggregate and a matrix material according to a weight ratio of 2-8: 1-3. The aggregate has particle sizes of 1-10mm and the matrix material has the particle sizes of 0.1-0.5mm. The aggregate comprises, by weight, 28-50 parts of fused magnesia, 25-45 parts of modified white alundum, 5-15 parts of zirconium mullite and 8-20 parts of magnesium aluminate spinel. The matrix material comprises magnesia powder, silicon oxide fine powder, mullite powder, alumina fine powder and andalusite. The pouring material utilizes appropriate aggregate and the matrix material and has wear resistance and corrosion resistance, a uniform degree of expansion and good thermal shock stability. Through use of a fiber additive, pouring material integrality is improved, and pouring material flexural performances and anti-erosion performances are improved. The cement kiln tertiary air duct has the advantages of long service life, long replacement period, small production cost and high production efficiency under bad conditions.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a castable for a tertiary air duct of a cement kiln. Background technique [0002] In the tertiary air duct of the cement kiln, an elbow is needed to change the direction of the pipeline. The inner wall of the elbow is a smooth surface. The temperature of the tertiary air duct of the cement kiln varies greatly, the wind speed in the pipe is high, and the hot air flow contains a large number of fine clinker particles. The tertiary air duct is directly scoured and eroded by the dust-laden hot air flow for a long time, which makes the wear-resistant castable material fall off. At present, there are wear-resistant castable materials on the market, such as the silicon carbide mullite wear-resistant castable material disclosed in patent number CN103819204B , When used in this part, there are generally defects such as low wear resistance, poor high temperature resistance and poor the...

AI Technical Summary

Problems solved by technology

[0002] In the tertiary air duct of the cement kiln, an elbow is needed to change the direction of the pipeline. The inner wall of the elbow is a smooth surface. The temperature of the tertiary air duct of the cement kiln varies greatly, the wind speed in the pipe is high, and the hot air flow contains a large number of fine clinker particles. The tertiary air duct is directly scoured and eroded by the dust-laden hot air flow for a long time, which makes the wear-resistant castable material fall off. At present, there are wear-resistant castable materials on the market, such as the silicon carbide mullite wear-resistant castable material disclosed in patent number CN103819204B , when used in this part, there are generally defects such as low wear resistance, poor high temperature resistance and poor thermal shock resistance, resulting in frequent damage and short life.

In addition, the current rotary kiln has relatively strict requirements on the construction period. It requires a short construction period, fast kiln drying, and can be put into production and use relatively quickly. This puts forward higher requirements for the lining material. The existing castables are already very Difficult to meet the needs of the market

There are also improvements to the structure of the tertiary air duct of the cement kiln to overcome the above defects, such as a cement kiln tertiary air duct elbow disclosed by the patent No. CN202284700, but the effect is still not significant, and it is difficult to meet the requirements, resulting in production efficiency. Difficult to improve