Corundum silicon carbide brick for joint part of cement kiln transition zone and firing zone

Abstract

The invention discloses a corundum silicon carbide brick for a joint part of a cement kiln transition zone and a firing zone. The corundum silicon carbide brick is prepared from the raw material components in percentage by weight: 20-0% of 5-2mm tabular corundum, 30-10% of 2-1mm tabular corundum, 20-10% of 1-0.088mm tabular corundum, 15-10% of silicon carbide with a thickness of less than 0.088mm,20-10% of tabular corundum with a thickness of less than 0.088mm, 5-0% of 20-15[mu]m silica powder and 3.5-1.5% of the total mass of all the above materials of a binding agent which is externally doped. The binding agent is any one or two of magnesium lignosulfonate and a magnesium chloride solution, and the binding agent has a proportion of 1.05-1.25. The corundum silicon carbide brick is excellent in high temperature resistance and chemical corrosion resistance, and is suitable for the use in the joint part of the cement kiln transition zone and the firing zone. Compared with a service lifeof about 6 months of an ordinary silicon-mullite brick for the transition zone, the service life of the corundum silicon carbide brick is above 12 months.

Description

technical field [0001] A corundum silicon carbide brick for the junction of the transition zone and firing zone of a cement kiln, which uses plate-shaped corundum as the main aggregate, and improves the wear resistance and chemical corrosion resistance of the product. Sintered tabular corundum fine powder and silicon micropowder with high reactivity are added to the matrix to generate aluminum-rich mullite phase in situ. Compared with traditional silica molybdenum bricks, this product is superior in cement clinker erosion resistance under high temperature conditions. It is mainly used in the transition zone and the junction of the firing zone inside the new dry-process cement rotary kiln to solve the problem of serious damage to refractory materials in this area during use. Background technique [0002] With the rapid development of the cement industry and the successful application of new dry kiln decomposition technology, it provides great opportunities and challenges for...

AI Technical Summary

Problems solved by technology

At the same time these free SiO 2 Locally enriched, eroded by alkaline compounds from kiln materials infiltrated into bricks, forming expansive ka-nepheline (K 2 O·Al 2 o 3 2SiO2 2 ) and leucite (K 2 O·Al 2 o 3 4SiO2 2 ), causing bricks to be damaged by "alkali cracking" and affecting the service life