Anti-skinning and wear-resistant prefabricated brick for cement kiln

Abstract

The invention discloses a crust-resistant and wear-resistant prefabricated brick for cement kilns, which comprises a base material, ingredients and additives. The base material includes the following components in parts by weight: 48-56 parts of fused magnesia, 35-45 parts of white corundum, 12-33 parts of zircon, 12-18 parts of mullite and 3-12 parts of magnesia-alumina spinel, the content of magnesium oxide in the fused magnesia is more than 95%, and the ingredients include particle ingredients and fiber ingredients , the diameter of the fiber ingredients is 3-8mm, the added amount of the fiber ingredients is 13-20% of the sum of the weight of the base material and the particle ingredients; the white corundum includes a mass percentage of 16-25% 30-65% of the white corundum with a particle size of 0.5-2.5mm, 30-65% of the white corundum with a particle size of 2.5-6.5mm and 30-65% of the white corundum with a particle size of 2.5-6.5mm. The prefabricated bricks provided by the invention are especially suitable for use in cement kilns. They have high temperature resistance, good alkali resistance, wear resistance and thermal shock stability, can effectively prevent skinning, overcome blockage, and ensure The kiln tail system is well ventilated.

Description

technical field [0001] The invention relates to a prefabricated brick, in particular to a crust-resistant and wear-resistant prefabricated brick for a cement kiln, which belongs to the field of refractory materials. Background technique [0002] In the new dry-process cement kiln, the calciner cone, feeding chamber, kiln tail slope, etc. are easy to block materials, and the impact of air cannons, water guns or even iron rods will seriously damage the castables, and the kiln is often shut down for maintenance. . Usually, steel fiber castables or high-alumina low-cement castables are used in these parts, such as a mullite steel fiber castable disclosed by the patent number CN101805198B, expressed in weight percentage, the mullite steel fiber castable The proportion of raw materials contains 29~40% of brown corundum, 10~15% of high alumina bauxite clinker, 18~32% of sintered mullite, 8~12% of fused mullite, 3~7% of silica powder, 2~5% of coagulant and 1~3% of stainless steel ...

AI Technical Summary

Problems solved by technology

However, in the process of use, there will always be problems of crusting and clogging of cement raw materials. If it sticks into layers, it is called crusting. In severe cases, it will cause clogging, resulting in poor ventilation of the kiln tail system, disordered thermal system, and a decrease in the decomposition rate of the cement calciner. , coal consumption increased