Method for controlling dioxin in fly ash washing process through sintering treatment

A control method and sintering treatment technology, applied in the field of waste incineration fly ash treatment, can solve the problems of high chlorine content, affecting the quality of sintered ore, equipment corrosion, etc., to reduce secondary generation, prevent secondary generation, and facilitate centralized degradation. Effect

CN113649393APending Publication Date: 2021-11-16CENT SOUTH UNIV +1

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Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: CENT SOUTH UNIV
Publication Date: 2021-11-16

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Abstract

The invention discloses a method for controlling dioxin in a fly ash washing process through sintering treatment, which comprises the following steps: carrying out washing dechlorination treatment on waste incineration fly ash, performing pelletizing, coating the surfaces of pellets with a slaked lime layer, and carrying out drying to obtain washed fly ash pellets; and mixing the washed fly ash pellets into the iron ore sintered granules to be uniformly mixed, distributing the mixture to the middle lower part of a sintered material layer through segregation, and performing igniting and sintering. According to the method, the waste incineration fly ash is subjected to washing dechlorination, secondary generation of dioxin in the sintering process can be greatly reduced, meanwhile, the surfaces of the washing fly ash pellets are coated with slaked lime, chlorine volatilized by the washing fly ash ball material and surrounding sintering materials can be adsorbed, and by optimizing the distribution and sintering technology, the dioxin in the fly ash is effectively degraded, and secondary generation of the dioxin in the sintering process is inhibited. According to the method, secondary generation of the dioxin can be effectively inhibited under the condition that the quality of the sintered ore is not affected, and clean resource utilization of the waste incineration fly ash is promoted.

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Description

technical field

[0001] The present invention relates to a method for processing waste incineration fly ash, in particular to a method for co-processing waste incineration fly ash by using iron ore sintering process, and in particular to a method for washing out chlorine from waste incineration fly ash and using iron ore sintering The invention discloses a method for realizing the decomposition of persistent organic matter such as dioxin in washed fly ash, belonging to the technical field of waste incineration fly ash treatment. Background technique

[0002] According to the definition in my country's "Standards for Pollution Control of Domestic Waste Incineration" (GB18485-2014), incineration fly ash (IFA) refers to the trappings of the flue gas purification system and the bottom ash settled at the bottom of the flue and chimney. Small particles and volatile substances are taken from the combustion chamber to air pollution control systems (APCDs), where solid residues are se...

Claims

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