Production process of white cement

Abstract

The invention discloses a white cement clinker bleaching process. The white cement clinker bleaching process comprises the following steps: breaking raw materials, then preparing raw material, mixingthe raw material, then firing, immersing and bleaching in water, drying clinker, milling cement to obtain white cement. The raw meal used for roasting are prepared by mixing the broken raw materials,then carrying out closed-loop raw meal milling with cooperation of a high-chromium vanadium titanium ball mill and a powder concentrator. Compared with the existing cement process, the heat consumption of unit of clinker of a roasting system can be reduced 80-120kcal in per kg of clinker. The white cement clinker bleaching process is taken as a process with latest white cement clinker bleaching technology, optimal process and lowest energy consumption at home and abroad at present; the white cement clinker bleaching process is reasonable in processes, environment-friendly in design concept andadvanced in technical indexes, meets the national energy economization and environment protection trend, can reduce the production costs of enterprises, and has extremely high operability and practicability.

Description

Technical field [0001] The invention relates to a cement production process and equipment, in particular to a white cement production process. Background technique [0002] White Portland cement is abbreviated as "white cement". In order to improve the whiteness of the clinker, the high temperature clinker out of the kiln is required to adopt a water spray quenching bleaching process during the production process of white cement. After the clinker is discharged from the kiln (1400℃~1450℃), it is quenched by water or sprayed with water. Most of the liquid phase in the clinker becomes vitreous before it can crystallize. A small part of the crystallized particles cannot gradually grow up and become fine grains. The reflection ability of the crystal is improved; at the same time, a large amount of water vapor is generated instantly to wrap the surface of the clinker to isolate the air, so that the low-priced iron minerals in the clinker are not oxidized, thereby improving the whitene...

AI Technical Summary

Problems solved by technology

However, the hourly output of Raymond mills is relatively low. A production line with an annual output of 30,000 tons needs to be equipped with 5 sets of 4R Raymond mills, resulting in many single units, many equipment components, high failure downtime, and a large amount of maintenance.

The average operating rate of the 5 units is only 68%, which consumes a lot of energy and increases the product cost

In the above three white cement clinker bleaching processes, none of the remaining heat of the clinker is effectively recycled. Method 1) does not have the function of heat recovery, and the high-temperature water vapor generated by cooling the clinker in methods 2) and 3) It is extracted from the exhaust pipe, and a part of the heat of water vapor can be recovered through heat exchangers and other equipment, but the heat recovery effect is poor