Efficient bleaching process of white cement clinkers

Abstract

The invention discloses an efficient bleaching process of white cement clinkers. The efficient bleaching process of the white cement clinkers comprises the following steps of performing high-temperature firing on the white cement clinkers by a rotary kiln; discharging the white cement clinkers into a grate cooler from the discharging end of the rotary kiln for cooling; after the high-temperature cement clinkers enter the grate cooler, falling the high-temperature cement clinkers onto a first grate bed for cooling; performing sharp cooling on the cement clinkers in the first grate bed through providing mixed liquid nitrogen and air; cooling the cement clinkers to 600 to 800 DEG C; then, falling the cement clinkers onto a second grate bed to be cooled; performing air cooling in the second grate bed completely through the air; cooling the cement clinkers to 80 to 100 DEG C; discharging the cement clinkers out of the grate cooler. The invention aims at providing the efficient bleaching process of the white cement clinkers so as to solve the problems of whiteness improvement limitation and more heat consumption requirement during white cement clinker calcination.

Description

technical field [0001] The invention belongs to the field of white cement production, and in particular relates to a high-efficiency bleaching process of white cement clinker. Background technique [0002] After the Portland cement clinker is fired at high temperature, it needs to be cooled rapidly by air cooling to ensure that the clinker has good physical and mechanical properties, while the white Portland cement usually needs to be sprayed with water (or drenched in water or soaked in water) to increase the glass body to improve the temperature. Clinker whiteness (ie bleaching). Compared with rotary kiln calcining ordinary cement clinker, rotary kiln calcining white cement clinker is wasted due to water cooling, and the heat carried by clinker becomes water vapor. Since the rotary kiln cannot provide secondary air and tertiary air for calcination, As a result, the calcination of white cement clinker needs more heat consumption, and the output is low and the cost is high;...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-efficiency bleaching process for white cement clinker, so as to solve the problems that white cement clinker calcination needs more heat consumption and whiteness improvement is limited

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