High-thermal shock resistance composite kiln mouth castable

Abstract

The invention relates to a high-thermal shock resistance composite kiln mouth castable comprising, by weight, 13-25 parts of magnesium-iron brick granules, 15-25 parts of magnesium-aluminum brick granules, 10-15 parts of andalusite, 18-28 parts of cordierite, 10-20 parts of alumina powder, 3-5 parts of silica fume, 5-10 parts of light calcined magnesia powder, 4-8 parts of a complexing magnesium-aluminum adhesive. By means of the formula, the product has great thermal shock resistance, high mechanical strength and great chemical corrosion resistance, is low in porosity and is long in service life.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a composite kiln mouth pouring material with high thermal shock resistance. Background technique [0002] In the new dry process cement firing system, the kiln mouth is a very critical and special part. The use conditions of this part are harsh and complicated, and the lining material is damaged quickly, and the replacement of the lining must be carried out after the kiln is stopped and cooled. Therefore, the quality of the kiln lining directly restricts the operation rate of the clinker firing system and the output of cement clinker. At present, the average service life of refractory castables for domestic large-scale dry process kilns is 6 to 8 months, which is difficult to synchronize with the life of fired refractory bricks. The use of castables is not very stable, and incidents of shutting down the kiln for maintenance and reducing the operating rat...

AI Technical Summary

Problems solved by technology

[0003] At present, corundum and high-alumina steel fiber reinforced refractory castables are widely used in kiln mouth refractory materials. This product is a slightly acidic material, which is easy to chemically react with alkaline clinker, and the product is stable in thermal shock resistance. In general, the service life of aluminum-silicon refractory castables at the mouth of the rotary kiln does not exceed 8 months

Usually, the aluminum content in the kiln mouth castable is high and the strength is high, but the thermal shock resistance is poor, it is easy to crack and peel off, and the service life cannot be guaranteed

The Chinese patent application with the application number 201510511622.5 and the Chinese patent with the patent number ZL200410014658.4 both use the method of adding silicon carbide to improve the thermal shock resistance and erosion resistance of the kiln mouth castable, but there is a problem of easy oxidation during use

At present, there are Chinese patents with patent number ZL201210048037.2, Chinese patents with patent number ZL201510763835.7, and Chinese patent applications with application number 200810122034.2. Spinel is used as raw material to prepare kiln castables, but spinel is directly used As a raw material, the material cost increases, and the in-situ spinel binder phase cannot be formed at high temperature, and most of the binders used are calcium aluminate cement, which cannot completely match the composition of the main material.

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