Innocent treatment method of waste incineration flying ash

Abstract

The invention discloses an innocent treatment method of waste incineration flying ash, comprising the following steps: S1, pretreatment, evenly mixing waste incineration flying ash with fluxing agent,performing pelletizing treatment to obtain flying ash pellets, and further mixing the flying ash pellets with combustion improver to obtain mixture evenly; S2, self-propagating pyrolytic incineration, placing the mixture in a self-propagating pyrolytic incineration device to execute self-propagating pyrolysis treatment, wherein the self-propagating pyrolysis refers to that heat propagates by itself through materials to execute pyrolysis under the premise that the materials are not turned over; S3, washing, grinding incineration residues into residue powder in grain size of not more than 20 meshes, mixing the residue powder with water according to solid-liquid mass ratio of 1:4-8, stirring and pulpifying, standing and precipitating, separating and filtering to obtain washing liquid and washing filter residue. The method provided by the invention completely decompose Dioxin and heavy metal ions in the waste incineration flying ash, can realize innocent treatment of the waste incineration flying ash, simultaneously can remove most soluble salt, chlorine, and so on, in the residues, and can realize comprehensive utilization of the residues.

Description

technical field [0001] The invention relates to a hazardous and harmful solid waste treatment technology, in particular to a harmless treatment method for high-temperature incineration of waste incineration fly ash and water washing of residues. Background technique [0002] Waste incineration fly ash is mainly particulate matter collected in waste incineration flue gas treatment, which contains a considerable amount of toxic substances such as dioxins and heavy metals. Once these toxic substances enter the environment, they will cause great damage to the ecology and endanger the health of residents. [0003] As currently recognized as the safest and most stable fly ash treatment technology, the melting and solidification method can effectively treat dioxins and heavy metals in fly ash, and the slag can also be used as a resource. It has obvious advantages in terms of stabilization and resource utilization. However, most of the existing melting and solidification treatment ...

AI Technical Summary

Problems solved by technology

However, most of the existing melting and solidification treatment methods have the disadvantages of small processing capacity, complicated operation, and difficult implementation, and because the waste incineration fly ash contains a large amount of calcium, potassium, chlorine, etc., the molten residue of the waste incineration fly ash still contains a large amount of soluble Chlorine salts, etc., make slag very limited in terms of resource utilization

[0004] CN107477597B discloses a method for stable and harmless treatment of waste incineration fly ash. The method adopts water washing-acid leaching-water washing-incineration. resource utilization of residues

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