Prefabticated member for coal nozzle of cement kiln and preparation method thereof

Abstract

The invention relates to a prefabticated member for a coal nozzle of a cement kiln and a preparation method thereof. The prefabticated member is prepared from the following raw materials in percentage by weight: 55 to 70 percent of plate type corundum particle, 5 to 10 percent of silicon carbide particle, 5 to 8 percent of corundum fine powder, 5 to 10 percent of alpha-Al2O3 micro powder, 8 to 15 percent of pure calcium aluminate cement, 3 to 5 percent of silicon carbide fine powder, 2 to 4 percent of simple substance silicon powder, 1 to 2 percent of stainless steel fiber and 0.1 to 0.2 percent of polycarboxylate water reducing agent. The preparation method comprises the following steps of: mixing the corundum fine powder, the alpha-Al2O3 micro powder, the pure calcium aluminate cement, the silicon carbide fine powder, the simple substance silicon powder, the stainless steel fiber and the polycarboxylate water reducing agent; mixing the plate type corundum particle and the silicon carbide particle, and mixing together; adding 5-6wt% of water, uniformly mixing, forming and drying; and raising the temperature to 1,200-1,500 DEG C, and performing heat preservation for 2 to 4 hours. The process is simple; the intensity of a product is high; the thermal shock stability is high; the erosion resistance is excellent; and the abrasion resistance is good.

Description

technical field [0001] The invention belongs to the technical field of refractory materials for kiln burners, and in particular relates to a prefabricated part for a cement kiln coal injection nozzle and a preparation method thereof. Background technique [0002] The refractories for coal injection nozzles in cement kilns are one of the key factors to ensure the normal operation of cement kilns. At present, the service time is generally 3 to 4 months, and the service conditions are becoming more and more harsh. Generally, the damage methods of castables for coal injection nozzles mainly include: the radiant heat of the cement kiln during use and the thermal shock caused by the cold air used to cool the parts cause cracks and peeling of the material; Volatilization and condensation cause cyclic enrichment and intensify the erosion of refractory materials used for coal injection nozzles; during the production process, hot steam and cement dust cause wear and erosion of coal in...

AI Technical Summary

Problems solved by technology

[0004] It is worth noting that most of the refractory materials for coal injection nozzles are currently cast and cannot be pre-heated, and the temperature rises rapidly during the use of the rotary kiln, resulting in unstable strength at medium and low temperatures, and is easily corroded by atmospheres such as alkali, sulfur and chlorine.

Most of the existing technologies focus on how to solve the problems of poor thermal shock stability, poor wear resistance and poor corrosion resistance of refractory materials for coal injection nozzles, but none of them have achieved the desired effect. Even if the performance is better, the production process It is very complicated, and the labor cost increases accordingly. For example, the patented technology of "Clinker Kiln Wear-resistant Coal Injection Nozzle Combustion Device" (ZL200820096358.9) adopts the method of filling the castable between the inner casing and the outer casing to improve the overall wear resistance. However, it is too complicated to weld the grapple inside the outer casing and use two layers of casing to realize the pouring process.