Zircon mullite brick for cement kiln and preparation method thereof

Abstract

The invention relates to a zircon mullite brick for a cement kiln and a preparation method thereof. According to the technical scheme, by weight, 58-75% of particles, 3-20% of zircon mullite fine powder, 3-10% of Guangxi white clay fine powder, 1-3% of Ti3AlC2 / Ti3SiC2 composite powder, 2-7% of monatomic silicon fine powder, 3-15% of raw bauxite micro powder and 0.5-1.0% of zirconium boride fine powder are adopted as a raw material A, cerium chloride accounting for 0.5-2% of the raw material A by weight and sulfite lye accounting for 3-8% of the raw material A by weight are additionally added,stirring, forming and drying are performed, the temperature of 1,400-1,600 DEG C is kept constant for 2-8 h, and the zircon mullite brick for the cement kiln is obtained. According to the particles, kyanite tailing fine powder or gangue fine powder are adopted as a raw material B, yttrium oxide fine powder accounting for 0.5-2% of the raw material B by weight and sulfite lye accounting for 4-6% ofthe raw material B by weight are additionally added, uniform mixing, forming and drying are performed, the temperature of 1,300-1,500 DEG C is kept constant for 3-9 h, and cooling and breaking are performed to obtain the particles. The cost is low, and the prepared zircon mullite brick for the cement kiln is good in abrasion resistance, low in heat conductivity coefficient, good in thermal shockresistance and good in corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of zirconium molybdenum bricks. Specifically, it relates to a zirconium molybdenum brick for cement kiln and a preparation method thereof. Background technique [0002] As an important cementitious material, cement is widely used in civil engineering, water conservancy and national defense projects. As the key equipment of cement production, cement rotary kiln can be divided into preheating zone, decomposition zone, transition zone, firing zone and cooling zone according to the different temperature of each zone. High-alumina silicon carbide refractories have become the most widely used refractories in the transition zone due to their good thermal shock resistance and high softening temperature under load. [0003] In recent years, the use of cement rotary kilns to co-dispose of municipal solid waste and the use of waste as an alternative energy source for the cement industry has become the development dir...

AI Technical Summary

Problems solved by technology

However, harmful substances in these alternative energy sources such as alkaline substances, chlorides, and sulfides will form gaseous substances during the combustion process, and will continue to accumulate in the interior of the cement rotary kiln as the service time of the cement rotary kiln prolongs. erosion

On the other hand, the new dry-process cement rotary kiln is developing towards large-scale development, with increased volume and faster rotation speed, which also intensifies the wear rate of refractory materials.

During high-temperature service, the surface of high-alumina silicon carbide refractories in the transition zone cannot form a kiln skin, and will directly suffer from severe wear of cement clinker and direct penetration of alkaline corrosive gases, which will eventually lead to serious damage to the material

[0004] In addition, the high-aluminum silicon carbide refractories used in cement rotary kilns contain high silicon carbide content, resulting in high heat dissipation in the kiln body, which is not conducive to energy saving and consumption reduction in the cement industry

Therefore, with the development of the cement industry, traditional high-alumina silicon carbide refractory materials have been unable to meet the requirements of the transition zone of the cement rotary kiln.