Special casting material of coal-injection duct

Abstract

The invention discloses a special-purpose casting material of a coal-injection duct. The special-purpose casting material comprises the following components in percentage by weight: 5%-15% of silicon carbide, 15%-30% of andalusite, 10%-25% of corundum, 5%-15% of spinel powder, 15%-20% of silicon boride powder, 5%-10% of zirconite powder, 5%-10% of mullite powder, 5%-15% of aluminum oxide micro powder, 3%-8% of silicon micro powder, 2%-5% of pure calcium aluminate cement, as well as anti-explosion fiber and sodium hexametaphosphate which respectively account for 0.3% of the total weight of the components. The special casting material of the coal-injection duct disclosed by the invention has seismic stability, high temperature resistance, volume stability and abrasive resistance, has high strength, and can be used for improving the defects that the coal-injection duct is not wear-resisting and not thermal-spalling-resistant, so that the service life of a cement kiln coal-injection duct is prolonged to about 12-15 months from about 6-8 months at present.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a special castable for coal injection pipes. Background technique [0002] Compared with qualitative refractory products, unshaped refractory materials represented by refractory castables have the advantages of short process flow, low production energy consumption and cost, convenient use, wide application range, integrity and good use effect, so they are widely used in the world. It has developed rapidly, and its proportion in the whole refractory material is getting higher and higher. In some countries with advanced refractory technology, the output of unshaped refractories has approached or even exceeded the output of shaped products. For example, the current output of unshaped refractory materials in Japan accounts for about 60% of the total refractory materials; in the United States, it is about 50%; in Britain, Germany, France and other countries, ...

AI Technical Summary

Problems solved by technology

Due to the above-mentioned relatively harsh working environment, the castables for coal injection pipes have always been unsatisfactory in use, and the phenomenon of non-wear resistance and thermal spalling often occurs, which restricts the normal operation of cement kilns to a certain extent and affects the economic benefits of cement manufacturers.