Efficient household garbage incineration fly ash two-stage washing process

Abstract

The invention discloses an efficient household garbage incineration fly ash two-stage washing process. According to the efficient household garbage incineration fly ash two-stage washing process, electrolysis dechlorination is performed on effluent after second-stage rinsing, the chlorine content of the second-stage rinsing entering first-stage rinsing is reduced, meanwhile, medium-temperature electrolytic plate frame pressing filtering is adopted, the pressing filtering fly ash water content is controlled to be less than 25%, the dissolution and adsorption effects of bound water on chloride ions are reduced, so that the chloride ion content in fly ash after the second-stage rinsing is guaranteed to be less than 0.8%, and the requirements for entering a cement kiln are met; and meanwhile, according to the efficient household garbage incineration fly ash two-stage washing process, the chlorine ion dissolution process in the first-stage rinsing process is promoted by reducing the chlorine ion content in the second-stage rinsing pressing filtering effluent, and the efficient household garbage incineration fly ash two-stage washing process is one efficient and economical household garbage fly ash washing process.

Description

technical field [0001] The invention relates to a recycling treatment process of domestic garbage fly ash, in particular to a high-efficiency secondary washing treatment process of domestic garbage fly ash, which belongs to the field of solid waste recycling. Background technique [0002] As the mainstream of domestic waste treatment gradually shifts from sanitary landfill to waste incineration, domestic waste incineration fly ash has become an important pollutant. Domestic waste incineration fly ash refers to the residue collected in the flue gas purification system of domestic waste incineration power plants, which contains organic pollutants such as benzene series, dioxins, and trace heavy metals such as Pb and Cr. According to the "Standards for Pollution Control of Domestic Waste Incineration" (GB18485-2014): "Fly ash from domestic waste incineration should be managed as hazardous waste." Therefore, fly ash must be collected separately, and must not be mixed with house...

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Problems solved by technology

[0010] Chinese literature discusses that under the condition of liquid-cement ratio of 6:1, using two-stage countercurrent rinsing to clean the fly ash of grate waste incineration, the final chloride ion content can only be cleaned to 1.7%, which will cause serious damage to the subsequent blending of cement kilns. influences

At the same time, when the liquid-ash ratio reaches 6:1, the water consumption is high, which increases the energy consumption of subsequent additional issuances. Wang Yuting, Tang Minghui, Zong Da, etc.; characteristics of secondary countercurrent washing of grate waste incineration fly ash[J]. Zhejiang University Journal :Engineering Science Edition, 2019,53(5):981-987]

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