Anti-skinning spray coating for cement kiln preheater

Abstract

The invention relates to an anti-skinning spray coating for a cement kiln preheater. The spray coating comprises, by weight, 30-45 parts of mullite, 15-20 parts of andalusite, 10-15 parts of zirconitemicro-powder, 10-14 parts of silicon carbide micro-powder, 10-12 parts of Suzhou clay, 8-12 parts of calcium aluminate cement, 4-8 parts of aluminum oxide micro-powder, 1-3 parts of silicon micro-powder, 1-2 parts of lithium chloride and 0.01-0.03 part of sodium tripolyphosphate. The formula is adopted, so the thermal shock stability of the spray coating can be improved, the service life of the spray coating can be prolonged, and an energy-saving effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an anti-skinning spray coating for a cement kiln preheater. Background technique [0002] The dry process of cement has developed to today's precalciner kiln era, and each production line has a preheater, which is an integral key component of the precalciner kiln. In the cement production process, the preheating and partial decomposition of the raw material is completed by the preheater, which replaces part of the function of the cement rotary kiln, shortens the length of the kiln, and at the same time makes the gas material heat exchange process in the kiln in a piled state. The cement plant equipment is moved to the preheater and carried out in a suspended state, so that the raw material can be fully mixed with the hot gas discharged from the kiln, the contact area of ​​the gas material is increased, the heat transfer speed is fast, and the heat exchang...

AI Technical Summary

Problems solved by technology

The Chinese patent No. ZL201210311621.2 discloses anti-skinning spray coatings for cement kilns. A spray coating with anti-skinning ability is prepared from raw materials such as burnt gemstones, silicon carbide and high-alumina bauxite fine powder. The complex crystal transformation of silicon dioxide minerals such as cristobalite and quartz in gemstones at high temperatures is not conducive to thermal shock stability; the Chinese patent No. ZL201010286592.X discloses a silicon carbide spray coating formula, using silicon carbide It is used as the main raw material for the spray coating of cement kiln. The main defect is that a large amount of silicon carbide oxidation will thicken the brick oxide layer, the internal structure will become loose, and the service life will be short.

The Chinese patent application with the application number 201710001320.2 discloses a high-strength, lightweight and energy-saving ceramic spray coating, which uses lightweight mullite and alumina hollow spheres as the main raw materials to produce high-strength, lightweight spray coatings that can directly contact with dust-containing airflow, technical proposal The main component is porous raw materials, which can improve the energy-saving effect of the coating, but it is not conducive to improving the strength of the spray coating and thus affecting the service life

Images