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The new cement rotary kiln is the most widely used thermal equipment in cement production today, but in the preheater cone, the lowering tube, the decomposition furnace cone, the kiln exhaust chamber, etc. of the cement rotary kiln, the skin is often too thick. In the case of blockage, the kiln must be shut down for treatment, which will affect the output and cause economic losses.
First, the principle of crust production
All of the skinning will occur, mainly because the raw materials and fuel used in the cement kiln contain a variety of volatile elements. These elements pass through the pre-tropical zone and the firing zone to reach the cooling zone. During this process, chemical changes occur constantly in the high temperature, so that the kiln material has a certain viscosity and adheres to the surface of the refractory material, forming a primary skin crust. . Over time, these crusts are more and more adherent and harder. Finally, the kiln must be shut down for processing.
Second, anti-crust measures
Once the initial skin is formed, it will become harder and harder, and finally become difficult to handle. Through continuous production practice, the use of anti-crust refractory castables can minimize the speed of skinning and extend the safety of cement kiln. Operation cycle.
Anti-crust refractory castable
Third, the performance of anti-crust refractory castables
The anti-crust refractory castable is a low cement castable which is formed by mixing a certain proportion of materials such as silicon carbide aggregate, silicon carbide micropowder, alumina micropowder, pure calcium aluminate cement and water reducing agent. It has the characteristics of high fire resistance, good alkali resistance, remarkable anti-skinning performance, high compressive strength and long service life.
Anti-skinning refractory castable properties
Fourth, the use of anti-crust refractory castables
In the anti-crust refractory castable, due to the addition of a large amount of silicon carbide component, the lining of the anti-crust refractory castable is used, and the silicon carbide in the material is oxidized under the action of high temperature to form a glazed protective film. When the protective film on the surface is worn under the constant frictional scouring of the kiln material, the internally exposed silicon carbide continues to oxidize, thus repeatedly forming a glazed protective layer, thereby always having an anti-skinning effect.
Conclusion: Anti-crust refractory castables have achieved good results in the application of large cement rotary kiln such as Southern Cement, Tongli Cement, Jidong Cement and so on. It can effectively extend the operating cycle of the rotary kiln, thereby increasing production and improving economic efficiency.
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