Method for pretreating waste incineration fly ash before melting

Abstract

The invention discloses a method for pretreating waste incineration fly ash before melting. The method comprises the following steps: firstly, mixing fly ash with membrane filtration concentrate of waste leachate and stirring into a muddy mixing body; and secondly, performing extrusion molding on the mud-like mixing body obtained in the first step into a strip-columnar raw material of an electric arc furnace. According to the method disclosed by the invention, the membrane filtration concentrate of the waste leachate and the fly ash are mixed and stirred; and loose fly ash is combined together by using the cohesiveness of the membrane filtration concentrate of the waste leachate and is processed and molded into the strip-columnar raw material of the electric arc furnace, so that the high-efficiency treatment process of the fly ash in a melting furnace can be guaranteed, the difficult problem about harmless treatment of the membrane filtration concentrate of the waste leachate is solved, the measure of using waste to treat waste is realized, and multiple purposes by one method are achieved. The method has the advantages of simple flow, compact structure, small occupied area, less investment, high operation efficiency and the like; and remarkable environmental benefits and economic benefits are obtained.

Description

technical field [0001] The invention relates to a treatment method of waste incineration fly ash, in particular to a method for pretreatment of waste incineration fly ash before melting by using membrane filtration concentrated liquid of landfill leachate. Background technique [0002] Municipal solid waste, crop stalks, and municipal sludge are produced in a large amount and have a wide range of influences, which have become one of the important factors that seriously restrict the healthy development of my country's society and economy. At present, the national municipal solid waste production is as high as 160 million tons per year, and it is increasing at a rate of 5%-8% year by year. The use of incineration technology to deal with municipal solid waste is gradually rising in China due to its advantages of minimizing waste, minimizing pollution, harmlessness and resource utilization of heat energy. According to incomplete statistics, at present, nearly 100 waste incinera...

AI Technical Summary

Problems solved by technology

But this method still can produce a large amount of (about 30%) membrane filtration concentrated solution, wherein enriches a large amount of refractory organic matter, inorganic salts and trace heavy metal, is difficult to handle

At present, most of the domestic waste is refilled to landfills or sprayed back to waste incinerators. Over time, the lining of the incinerator is corroded, and the leachate from the landfill leachate accumulates refractory organic matter and increases the salt content until the relevant systems fail to operate.

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