Mullite corundum carbide silica brick for joint part of transitional zone and firing zone of cement kiln

Abstract

The invention relates to a mullite corundum carbide silica brick for a joint part of a transitional zone and a firing zone of a cement kiln. The mullite corundum carbide silica brick comprises the following raw materials by weight percent: 20-0% of 5-2mm sintered mullite, 30-10% of 2-1mm sintered mullite, 20-10% of 1-0.088mm sintered mullite, 15-10% of silicon carbide less than 0.088mm, 20-10% oftabular corundum less than 0.088mm, 5-0% of 20-15mum silica powder and additionally added binding agent, wherein the mass of binding agent is 3.5-1.5% of total mass of all the raw materials; the binding agent is selected from one or two of magnesium lignosulfonate and magnesium chloride solution; proportion of the binding agent is 1.05-1.25. The mullite corundum carbide silica brick provided by the invention has excellent high temperature resistance and chemical corrosion resistance and is suitable for the joint part of the transitional zone and the firing zone of the cement kiln. Compared with 6-month service life of the ordinary mullite silicon brick, the service life of the product provided by the invention is more than 12 months.

Description

technical field [0001] The invention relates to a mullite corundum silicon carbide brick for the junction of the transition zone and the firing zone of a cement kiln. The sintered mullite is used as the main aggregate to improve the wear 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] Mullite is Al 2 o 3 -SiO 2 The only stable compound in the binary system, its melting point is (1890±90) ℃, and it has the advantages of good thermal shock resistance, small ...

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