Method for treating waste incineration fly ash by using plasmas

Abstract

The invention discloses a method for treating waste incineration fly ash by using plasmas. The method comprises the following steps of: regulating the weight ratio of CaO to SiO2 in waste incineration fly ash; then granulating and compressing into blocks for pretreatment; sending the treated fly ash into a metal melting pool in a plasma reaction furnace through a dividing wheel and quenching fly ash melts into granules through water; and harmlessly treating tail gas in the furnace through a treatment system. The invention solves the problem of molten glass during treating the waste incineration fly ash by adopting plasma equipment, the problem of bridging in a feeding process, the problem of jamming of a feeder, the problem of pipeline blockage caused by the diffusion of the fly ash alongwith the tail gas, the problem of obtaining glass harmless to the environment by retreating the melts and the problem of tail gas innocent treatment.

Description

technical field [0001] The invention relates to the field of hazardous waste treatment and disposal, in particular to a method for plasma treatment of waste incineration fly ash. Background technique [0002] With the rapid development of domestic waste and medical waste incineration, the output of incineration fly ash is increasing year by year. Waste incineration fly ash contains a large amount of heavy metals (such as Hg, Cd, Pb, Cr and Zn, etc.) and dioxin and furan organic pollutants. The following table shows the composition of a fly ash and its heavy metal content. Dioxin in fly ash accounts for more than 60% of the total amount of dioxin produced in the incineration process, so the state clearly stipulates that fly ash must be stabilized before it can enter the landfill. [0003] Main components and heavy metal content of a waste incineration fly ash [0004] [0005] High-temperature melting treatment can pyrolyze dioxin and other organic pollutants in fly ash....

AI Technical Summary

Problems solved by technology

[0010] The invention provides a method for plasma treatment of waste incineration fly ash, which solves the problem of melting vitrification when plasma equipment is used to treat waste incineration fly ash, the problem of "bridging" of fly ash in the feeding process and the stuck feeder problems, the problem of pipeline blockage caused by the diffusion of fly ash with the tail gas, the problem of reprocessing the molten body to obtain an environmentally harmless glass body, and the problem of harmless treatment of the tail gas. The waste incineration fly ash is sent to the melting treatment device to effectively treat the melt The glass body is completely harmless to the environment through continuous processing, and the system's tail gas is treated in a harmless manner to remove acid and dust, ensuring continuous and stable operation of the system

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