A white cement clinker bleaching process and equipment

Abstract

The invention discloses a white cement clinker bleaching process which comprises the following steps: 1) performing water spray quenching on high-temperature white cement clinker discharged from a kiln to 550-600 DEG C through a single-drum bleaching machine; 2) performing air cooling on the white cement clinker quenched to 550-600 DEG C to 100 DEG C or below through a grate cooler, and simultaneously introducing hot air discharged from the grate cooler into a kiln entrance cover of the rotary kiln and a decomposition furnace to respectively serve as secondary air and tertiary air for supporting the combustion of fuel. The invention also discloses equipment for realizing the white cement clinker bleaching process. According to the invention, the functions of cement clinker bleaching, cooling and heat recycling are combined; the heat of the white cement clinker can be recycled under the condition of ensuring the bleaching and cooling of the white cement clinker; and the heat loss of a firing system can be greatly reduced.

Description

technical field [0001] The invention relates to a cement production process and equipment, in particular to a white cement clinker bleaching process and equipment. Background technique [0002] White Portland cement is referred to as "white cement" for short. In order to improve the whiteness of clinker, the production process of white cement requires that the high-temperature clinker exiting the kiln be quenched and bleached by spraying water. After the clinker leaves the kiln (1400°C-1450°C), it is water quenched or quenched by water spraying. Most of the liquid phase in the clinker becomes glass before it crystallizes, and a small part of the crystallized particles cannot grow gradually and become fine grains. At the same time, a large amount of water vapor is generated instantly by spraying water to wrap the surface of the clinker and isolate the air, so that the existing low-priced iron minerals in the clinker will not be oxidized, thereby improving the whiteness of the...

AI Technical Summary

Problems solved by technology

This method requires high energy consumption, and the partial hydration of the clinker after soaking in water reduces the strength of the clinker

2) Water spray method in the rotary kiln: the clinker is cooled by spraying water before leaving the kiln, and at the same time, a reducing agent is sprayed to prevent the formation of Fe 2 o 3 In this method, part of the water vapor enters the kiln, which increases the energy consumption of the system and affects the normal operation of the rotary kiln.

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

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