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

Pending Publication Date: 2021-11-16
CENT SOUTH UNIV +1
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Problems solved by technology

[0005] In view of the high chlorine content in waste incineration fly ash in the prior art, its use in iron ore sin

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

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[0040] Example 1

[0041] The incineration grate ash washed with water to give a Cl content of 0.7% washed fly ash, fly ash made into pellets washed 5mm, washed fly ash pellet CaO / SiO 2 The mass ratio of 2.5. Before attaching a layer of 1mm thick wrapped drying slaked lime (quicklime activity degrees 270ml), dried for 2h at a low temperature 100 ℃, to a moisture content of 5%. 60% Fe, 4% coke breeze (-0.5mm, 0.5 ~ 3mm and 3 ~ 5mm accounted for 20%, respectively, 60%, 20%), 11% limestone, 25% of return fines prepared by mixing tablets, granulation proceeds to when the first 5min, along the horizontal axis direction of the cylindrical attachment wrapped uniformly added quicklime washed fly ash pellets, pellet washed fly ash sintering additive amount of 0.5% of the starting material, mixing continued granulation 1min, the beads washed thoroughly mixed with the sintering raw fly ash. Using nine roller feeder (# 9 ~ # gap 5 is controlled to roll 5 ~ 8mm) was added to the obtained sin...

Example Embodiment

[0042] Example 2

[0043] The incineration grate ash washed with water to give a Cl content of 1.0% washed fly ash, fly ash made into pellets 8mm washed with water, washed fly ash pellet CaO / SiO 2 The mass ratio of 3.0. Prior to attaching a layer 0.5mm thick wrapped drying slaked lime (quicklime activity degrees 250ml), dried 3h at low temperature 80 ℃, to a moisture content of 9%. 65% of the sintered ore, coke powder 4.5% (-0.5mm, 0.5 ~ 3mm and 3 ~ 5mm accounted for 20%, respectively, 60%, 20%), 10.5% limestone, 20% of return fines and other raw materials mixing, granulation, granulation proceeds to when the first 3min, in the horizontal direction of the cylinder axis was uniformly charged to have a dressing washed fly ash with lime beads, washed fly ash sintered pellets added in an amount of 5.0% starting material, granulation continue 1min the beads washed thoroughly mixed with the sintering raw fly ash. Using nine roller feeder (# 9 ~ # gap 5 is controlled to roll 5 ~ 8mm) w...

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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.

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...

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00Y02P10/20
Inventor 甘敏黄斌斌范晓慧卢四平周志安钟伟季志云孙增青许澧鸣徐莉陈许玲黄晓贤王翔赵倩倩袁瑞瑞
Owner CENT SOUTH UNIV
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