Fireproof product for cement rotary kiln transition belt

Abstract

The invention relates to a refractory composition product, especially a refractory product for the transition zone of a dry-process cement rotary kiln. The basic composition is: 50-79% of bauxite clinker skeleton material with Al2O3≥90% and bulk density≥3.0g / cm3 ;Silicon carbide 5-20%; Al2O3≥32% clay 3-15%; Corundum 3-15%; Among them, silicon carbide, clay, and corundum are all added in the form of 0.1-0mm fine powder, and the chemical composition after firing is Al2O363- 75%, SiO28-32.5%, SiC4.5-19%. Compared with the existing technology, the performance of refractory products has been significantly improved, making it more suitable for use in the transition zone of cement rotary kilns. The fired products have a high load softening temperature, and the starting temperature of 0.2Mpa load softening reaches 1570-1660 ° C. It has high compressive strength at room temperature. It reaches 85-110Mpa, and also has low thermal conductivity, 700°C, 1.18W / m.k; 1000°C, 1.27W / m.k, which can reduce the surface temperature of the cylinder compared with the original magnesium spinel, and the thermal expansion rate is low, 1000°C, 0.61%, thereby prolonging the service life as a whole, and the expected service life can reach 1.5-2 years after testing.

Description

technical field [0001] The invention relates to a refractory composition product, in particular to a refractory product for the transition zone of a dry-process cement rotary kiln. Background technique [0002] The temperature in the transition zone of the dry-process cement rotary kiln is high, usually around 1600°C, and the temperature changes frequently, which becomes the most concentrated area of ​​stress in the kiln body, making the kiln skin difficult to hang firmly, and it hangs when it falls off, making the refractory kiln lining often directly Exposure to high-temperature air flow, and the large flow rate of fired material causes the kiln speed to be extremely fast, so objectively, the refractory lining bricks in this part suffer the strongest destructive power. Therefore, this part has become the most critical part of the whole kiln with the most severe service conditions and the most critical influence on the service life of the kiln body. In the prior art, the r...

AI Technical Summary

Problems solved by technology

It is known that different application occasions have different requirements for refractory compositions, so general refractory compositions are not universal