Anti-crusting castable and preparation method thereof

Abstract

The invention discloses an anti-crusting castable, and belongs to the field of refractory materials. The anti-crusting castable is prepared from, by mass, 40-55% of silicon carbide with the granularity being 1-3 mm, 5-10% of mullite with the granularity being 1-5 mm, 1-5% of calcined alpha-alumina with the granularity being 0-2.5 [mu]m, 1-5% of silicon micro-powder with the granularity being 0-0.15 [mu]m, 5-10% of white corundum powder with the granularity being 1-4 mm, 5-10% of calcium aluminate cement, 3-8% of fly ash ceramsite with the granularity being 0.01-0.1 mm, 5-10% of aluminum sulfate powder with the granularity being 0.5-1.5 mm, 0.1-0.5% of explosion-proof fibers and 0.2-0.3% of a composite water reducer. The anti-crusting castable greatly reduces the generation frequency of crusted skins, allows the crusted skins to be conveniently cleaned, and has excellent resistance to wear, alkalis and shock.

Description

Technical field [0001] The invention relates to the field of refractories, in particular to an anti-skinning castable and a preparation method thereof. Background technique [0002] Cement is one of the largest industrial products, and the cement industry is the pillar industry of my country's national economy. With the development of my country’s economy, the scale of the cement industry continues to expand, especially in the 21st century. With the maturity of the new dry process cement production process and technology, the number of new dry process cement production lines for large-scale rotary kilns in my country has developed rapidly. Thanks to the new dry-process cement rotary kiln with a diameter of ∮4.5~6m and a kiln length of 70~84m, it has the advantages of high kiln temperature, fast kiln speed, large output and good economic benefits, but it also brings alkali corrosion of the kiln lining Aggravated, more complex structure and other issues. [0003] The cement industry ...

AI Technical Summary

Problems solved by technology

[0005] At present, the refractory materials used in the kiln mouth are mainly high silicon carbide or composite magnesium-aluminum spinel castables, such as the silicon carbide anti-skinning castable provided by the patent number CN100467426C and the anti-skinned castable provided by CN104671805B, which solve the problem of The problem of easy wear of castables has alleviated the problem of skinning to a certain extent. However, at high temperatures, the glaze layer on the surface of silicon carbide castables is easy to react with CaO and loses the ability to resist skinning, while magnesium aluminum spinel High-quality castables are easy to peel off. If a binder is used to resist peeling, the thermal shock resistance and corrosion resistance of the castable will be reduced, and impurities will be easily absorbed.

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