Efficient household garbage incineration fly ash two-stage washing process

A technology of domestic waste incineration and fly ash, which is applied in the field of solid waste recycling, can solve the problems of high water consumption, influence of cement kiln mixing, and increased energy consumption.

Inactive Publication Date: 2021-05-11
江山市虎鼎环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Efficient household garbage incineration fly ash two-stage washing process
  • Efficient household garbage incineration fly ash two-stage washing process
  • Efficient household garbage incineration fly ash two-stage washing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high-efficiency domestic waste incineration fly ash secondary washing process, comprising the following steps:

[0037] (1) Secondary rinsing: the press filtrate after the second-stage rinsing of fly ash (after electrolytic medium-temperature plate and frame press filtration) enters the dechlorination device for treatment, reduces the chloride ion content in the press-filtrate, and enters the first stage of fly ash rinsing treatment process; water The gray ratio (weight ratio) is controlled at 1.2:1~2:1.

[0038] (2) Wastewater treatment section: a section of press filtrate after rinsing enters the sewage treatment system, and through physical and chemical processes such as removal of heavy metals, calcium and magnesium ions, a mixed solution mainly composed of potassium chloride and sodium chloride is formed, and the solid-liquid separation adopts a plate frame Filter press, the water is clear and transparent;

[0039] (3) Evaporation and reuse section: Evaporation ...

Embodiment 2

[0042] For fly ash from a self-provided incineration plant of a listed company in Nantong, Jiangsu, the chloride ion content of the fly ash is 6.8%, and the specific surface area measured by BET is 7.38m 2 / g.

[0043] Table 1 Properties of fly ash from a self-provided incineration plant of a listed company in Nantong

[0044] Sample (mg / g) Al As Ba be Ca Cd Cr Cu Fe sample 1 113.5389252 0.08063812 1.464844 0.001363 4.688172 0.00227 0.102179 0.087601 60.50213 sample 2 111.9070529 0.08895567 1.562096 0.002017 4.688741 0.001707 0.114353 0.078822 49.93023 (mg / g) K Li Mg mn Na Ni P Pb Zn sample 1 8.316022099 0.20058764 4.85668 0.827225 6.652587 0.056953 0.644603 0.048714 0.091567 sample 2 9.140050378 0.22234786 5.248136 0.903393 7.367884 0.060979 0.715202 0.050777 0.088581

[0045] After being treated by the method of this embodiment, the two-stage washing time is set to 4 ho...

Embodiment 3

[0047] A high-efficiency domestic waste incineration fly ash secondary washing process, the main properties of the collected fly ash include:

[0048] Table 2 Property analysis of a certain fly ash in Jiaxing, Zhejiang

[0049] sample name(%) SiO 2

[0050] Through the two-stage water washing, the two-stage water washing time is set to 3.6 hours respectively, the water-cement ratio is 1.3:1, the temperature of the electrolytic medium-temperature plate and frame filter press is set to 65°C, and the electrolytic current density is 85A / m 2 , The chlorine content of the fly ash after electrolytic medium-temperature plate and frame pressure filtration is less than 0.8%, the molar ratio of sodium carbonate to calcium and magnesium ions is 1.8:1, and there is no need to add sodium sulfide and ferrous chloride. The pH value of the plate and frame filtrate is adjusted back to 7.3, so as to ensure that after the aluminum ions and other amphoteric ions are removed, the clea...

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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...

Claims

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Application Information

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IPC IPC(8): B09B3/00C02F9/10C02F101/20C02F101/10C02F101/12
CPCB09B3/00C02F9/00C02F1/66C02F1/56C02F2001/007C02F1/04C02F2101/20C02F2101/10C02F1/001C02F2101/12C02F1/46109B09B3/80B09B2101/30
Inventor 宁晓强
Owner 江山市虎鼎环保科技有限公司
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