Special castable for kiln outlet

Abstract

The invention discloses a special castable for a kiln outlet, which belongs to the field of refractory materials. According to the invention, the special castable comprises the following components in percentage by weight: 8-25% of silicon carbide, 10-30% of andalusite, 20-35% of corundum, 5-15% of spinel powder, 5-10% of zircon mullite powder, 1-5% of zirconium diboride, 1-5% of silicon nitride,5-15% of alumina micropowder, 3-6% of pure calcium aluminate cement, 0.5-1% of explosion-proof fiber and 0.06-0.2% of sodium tripolyphosphate, which is an additive. By using the special castable for the kiln outlet, disclosed by the invention, the phenomenon of poor wear resistance, block falling and the like in the kiln outlet can be effectively improved; the service life of the cement kiln outlet can be largely prolonged; and the special castable for the kiln outlet, disclosed by the invention, has the advantages of high temperature resistance, heat shock resistance, wear resistance, high strength, irreversible micro expansion and the like.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a special castable for kiln mouths. Background technique [0002] At present, my country's new dry process cement production line is developing rapidly, so higher requirements are put forward for the use of refractory materials. The new dry process cement production technology widely adopts new technologies such as increasing combustion intensity, enhancing heat transfer effect, reducing heat loss and reducing environmental pollution, which has raised the cement production level to a new stage. However, due to higher temperature, more rapid temperature changes, stronger chemical erosion and more severe mechanical stress, the new dry process cement production line needs more refractory materials with excellent performance. [0003] The kiln mouth of the cement kiln is used in a harsh environment, except that it is as high as 1300-1400 o In addition to the high temperature, it...

AI Technical Summary

Problems solved by technology

Kiln mouth castables have developed from traditional high-alumina high-strength castables to high-performance low-cement castables characterized by the addition of ultrafine powder and high-efficiency water reducers. The existing corundum-silicon carbide castables (such as patent CN100391902C), corundum- Spinel castables (such as patent CN101407424A), corundum-mullite castables (such as patent CN101445379B) and other low-cement castables, although the overall performance of the castables have been improved, the service life of the kiln mouth is higher than the traditional use. The 4-6 months of aluminum high-strength castables is extended to about 10 months, prolonging the life of the cement kiln mouth, but it still cannot meet customer needs, especially in some cement kilns with harsher operating environments. The current kiln mouth castables are not Wear-resistant and easy to peel off, which seriously restricts the improvement of the operation rate of the cement kiln production line and affects the economic benefits of cement manufacturers

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