Anti-skinning and wear-resistant prefabricated brick for cement kiln feeding chamber

Abstract

The invention relates to the field of refractory materials, in particular to a crust-resistant and wear-resistant prefabricated brick for a cement kiln feed chamber. It includes the following raw materials and parts by weight: 20-50 parts of white corundum; 18-30 parts of mullite M45; 15-40 parts of fused magnesia-aluminum spinel; 10-30 parts of fused iron-aluminum spinel; 3-5 parts of zirconium carbonate; 3-5 parts of silicon carbide; 2-3 parts of silicon micropowder; 2-8 parts of alumina micropowder; 0.1-1 part of sodium tripolyphosphate; 5-9 parts of cement; 3-5 parts of anti-corrosion liquid; 5-10 parts of the first external binder; 2-7 parts of the second external binder; 3-7 parts of the first solid additive; 1.5-6 parts of the second solid additive . Fused magnesia-aluminum spinel includes 15-25 parts of fused magnesia-aluminum spinel particles of 5-8mm, 5-20 parts of 3-5mm particles, 5-15 parts of 1-3mm particles, and fused magnesium particles of 0-1mm 5‑15 parts of aluminum spinel particles. The prefabricated brick of the invention has high strength, the cement clinker is not easy to adhere to the prefabricated brick, and the service life exceeds 3 years.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a crust-resistant and wear-resistant prefabricated brick for a cement kiln feed chamber. Background technique [0002] In the new dry process kiln, the calciner cone, feeding chamber, kiln tail slope, etc. are prone to material blockage. The impact of air cannons, water cannons and even iron rods will seriously damage the castables, and the kiln is often shut down for maintenance. The castables used in these parts are required to have higher high temperature resistance and better alkali resistance, wear resistance and thermal shock stability. Usually, these parts use steel fiber castables or high-alumina low-cement castables. During the process of use, there will always be the problem of cement raw meal crusting and clogging, that is, the raw meal in the feeding chamber will appear in liquid phase prematurely, and it will adhere to form a layer in the feeding chamber, which is...

AI Technical Summary

Problems solved by technology

The castables used in these parts are required to have high high temperature resistance and good alkali resistance, wear resistance and thermal shock stability. Usually, steel fiber castables or high aluminum low cement castables are used in these parts. During the process of use, there will always be the problem of cement raw meal crusting and clogging, that is, the raw meal in the feeding chamber will appear in liquid phase prematurely, and it will stick to form a layer in the feeding chamber, which is called skinning. In severe cases, it will cause blockage and lead to The ventilation is not smooth, the thermal system is disordered, the decomposition rate of the cement calciner is reduced, and the coal consumption is increased

For example, the announcement number is CN104355646A (2015-02-18), a cement kiln mouth castable, although it can reduce the problems of many pores and uneven distribution of pores, but the shedding phenomenon of the castable is still not improved. Not high, poor high temperature resistance and weak thermal shock resistance, etc., not suitable for the preparation of anti-skinning and wear-resistant prefabricated bricks for cement kiln feeding chambers