Method for preparing microfine mineral admixture by using waste heat of kiln

Abstract

The invention discloses a method for preparing a microfine mineral admixture by using the waste heat of a kiln. The method comprises the following steps that: waste heat of waste gas generated by thekiln is used for preparing low-grade superheated vapor in a waste heat boiler; by taking the superheated vapor as power, a vapor stream grinding-grading machine is used for grinding the mineral admixture; and the slag is preheated by fume and delivered into the grinding-grading machine to realize the microfine processing of solid wastes such as the mineral admixture and the like. Compared with theprior technical scheme, the process can perform scale processing of the mineral admixture with low cost, can improve the utilization rate and the added value of the mineral admixture, realizes the resource recycling of wastes and improves environment.

Description

(1) Technical field: [0001] The invention relates to a production method of an ultrafine mineral admixture, in particular to the preparation of an ultrafine mineral admixture by utilizing waste heat of a kiln. (two) background technology: [0002] Slag powder is used as the main mineral admixture of cement and concrete. In order to improve the activity of the mineral admixture, it needs to be micro-processed. However, the processing cost of fine slag powder is expensive, and the amount of admixture in cement and concrete has not been large for a long time. , a large amount of slag is dumped as solid waste. According to the statistics of the National Environmental Bulletin, the national industrial solid waste production in 2006 was 1.52 billion tons. At present, in the cement concrete industry, the demand for slag powder as an admixture is increasingly tense, which cannot meet the strong engineering demand, and the comprehensive utilization of solid industrial waste is immine...

AI Technical Summary

Problems solved by technology

However, preheating air, preheating gas, heating, and other domestic heat only use kiln waste heat as a heat source, and the amount of use is limited. A large amount of kiln waste heat is wasted, and most of the kiln waste heat is used for power generation at this stage. The thermal energy utilization rate is about 22%, so the utilization efficiency is low and the investment is large; these methods of utilizing the waste heat of the kiln fail to fully and effectively utilize the energy

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