Method for producing silicon mullite abrasive brick

Abstract

The invention discloses a method for producing a silicon mullite abrasive brick, comprising the following steps of: firstly, selecting 4 parts of bauxite granules, 2 parts of brown aluminum oxide granules, 0.4 part of carborundum granules, 2.5 parts of bauxite powder, 0.8 part of carborundum powder, 0.2 part of metallic silicon powder, 0.2 part of silicon powder and 0.5 part of clay powder in parts by weight; secondly, adding the bauxite granules, the brown aluminum oxide granules and the carborundum granules into an edge runner wet mill and premixing, then adding lignin liquor accounting for 4-5 percent of the total weight of materials and premixing, adding the bauxite powder, the carborundum powder, and the metallic silicon powder and mixing, adding the clay powder and the silicon powder, mixing and discharging ground ageing mixture; and thirdly, pressing the pug into semi-finished products, feeding the semi-finished products into a drying chamber, drying, feeding semi-finished products into a high-temperature tunnel kiln and sintering to form a finished brick body. The brick body has long service life, can keep synchronous running with a kiln liner in a firing zone, reduces the maintenance times for users to close down the kiln, and simultaneously has the advantages of high softening temperature for load, favorable thermal shock resisting stability, favorable wear-resisting performance and the like.

Description

technical field [0001] The invention relates to a production method of a refractory brick for a cement kiln, in particular to a production method of a silicon molybdenum wear-resistant brick used in the preheating zone of a cement kiln. Background technique [0002] The transition zone of large-scale new dry-process cement kiln is not easy to stick to the kiln skin due to the temperature characteristics, so it suffers from mechanical stress and friction. The more prominent point is that according to the requirements of the cement sintering process, the highest temperature point of the sintering zone must be constantly Moving back and forth, due to the constant change of the temperature field, general materials cannot withstand the rapid cooling and heat caused by the change of the temperature field, resulting in the transitional zone lining bricks being easily damaged, and unable to keep pace with the life cycle of the firing zone material. With the gradual increase of the d...

AI Technical Summary

Problems solved by technology

[0002] The transition zone of large-scale new dry-process cement kiln is not easy to stick to the kiln skin due to the temperature characteristics, so it suffers from mechanical stress and friction. The more prominent point is that according to the requirements of the cement sintering process, the highest temperature point of the sintering zone must be constantly Moving back and forth, due to the constant change of the temperature field, general materials cannot withstand the rapid cooling and heat caused by the change of the temperature field, resulting in the transitional zone lining bricks being easily damaged, and unable to keep pace with the life cycle of the firing zone material. With the gradual increase of the diameter of the new dry process large kiln (from 2 meters to the current 6 meters), and the increase in the speed of the kiln body (the speed of the traditional wet process long kiln is generally 60-70 rpm, and the large new dry process The kiln speed is 180-210 rpm, even as high as 240 rpm), the weight of the lining brick per unit length will increase relatively, and the thermal stress and mechanical stress on the kiln lining are much higher than those of traditional kilns.

Although cheap anti-flaking high-alumina bricks are widely used in cement enterprises with good operation technology and small kiln diameter, high-alumina bricks are restricted by the characteristics of the material itself, and are used in the transition zone of large (diameter more than 4 meters) cement rotary kilns. The effect is not ideal, the longest service life is no more than 8 months, or even only 2-3 months, and the service life of the transition zone lining brick and the firing zone kiln lining cannot be kept in sync. The transition zone kiln lining needs one year Frequent kiln maintenance