Rotary kilneye castable for treating industrial minerals and preparation method of castable

Abstract

The invention relates in particular to a rotary kilneye castable for treating industrial minerals and a preparation method of the castable. The preparation method adopts the technical scheme that the preparation method comprises the steps that 40-60wt% of brown corundum particles or alumina particles, 20-40wt% of mullite particles, 6-20wt% of white corundum fine powder, 5-15wt% of silicon carbide fine powder, 1-5wt% of silicon oxide micro powder, 1-8wt% of activated alpha aluminium oxide micro powder and 2-8wt% of aluminate cement are taken as raw materials; 4-8wt% of water and 0.1-0.4 wt% of water reducing agent are added to the raw materials and mixed uniformly; casting and vibration molding is conducted; and a molded blank is naturally dried for 24h in air, and then dried for 24-48h at 110 DEG C. The rotary kilneye castable for treating the industrial minerals mainly comprises Al2O3 and SiC, has main crystalline phases of corundum, silicon carbide and mullite, has higher strength, and has the characteristics of good erosion resistance, thermal shock stability and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of castables for rotary kilns. In particular, it relates to a casting material for a rotary kiln mouth for processing industrial minerals and a preparation method thereof. Background technique [0002] Rotary kiln is an important type of thermal equipment, which is widely used in the production or treatment of cement, lime, industrial minerals and industrial waste. Traditionally, the working lining of the rotary kiln mouth is built with refractory bricks, but bricks are easy to fall off and the cement kiln is easily deformed after long-term operation, which makes bricklaying and maintenance difficult. Therefore, in the past two decades, castables have been gradually applied at the kiln mouth of the rotary kiln, which effectively solved the problem of cylinder deformation and achieved good results. But in addition to the cement industry, there are a large number of rotary kilns for other purposes, such as s...

AI Technical Summary

Problems solved by technology

However, during the local overheating during the roasting process and the long-term operation, the kiln lining refractories are subject to double erosion, wear, mechanical stress and thermal shock of calcined minerals and additives, resulting in poor corrosion resistance, poor thermal shock stability, and structural problems. Severe circles and reduced lifespan

[0003] Therefore, the requirements for refractory materials for rotary kilns that process industrial minerals are different from those for cement rotary kilns. Not only are refractory materials required to have good mechanical properties, but also refractory materials are required to have good thermal shock stability, alkali resistance and salt erosion resistance. However, the current refractory materials for rotary kiln processing industrial minerals are still difficult to meet the production needs of the rotary kiln.