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Method of synchronously stabilizing heavy metals and degrading polycyclic aromatic hydrocarbons from waste incineration fly ash

A technology for waste incineration fly ash and polycyclic aromatic hydrocarbons, which is applied in chemical instruments and methods, transportation and packaging, solid waste removal, etc. Effect

Active Publication Date: 2018-11-02
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage, the waste incineration ash pollutant discharge standards of countries around the world, including my country, do not clearly stipulate the PAHs emission limit. Compared with heavy metals, the research on the harmlessness of PAHs in waste incineration fly ash still remains Relatively small

Method used

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  • Method of synchronously stabilizing heavy metals and degrading polycyclic aromatic hydrocarbons from waste incineration fly ash
  • Method of synchronously stabilizing heavy metals and degrading polycyclic aromatic hydrocarbons from waste incineration fly ash
  • Method of synchronously stabilizing heavy metals and degrading polycyclic aromatic hydrocarbons from waste incineration fly ash

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Effect test

Embodiment 1

[0029] The method for synchronously stabilizing heavy metals and degrading polycyclic aromatic hydrocarbons in the waste incineration fly ash of this embodiment comprises the following steps:

[0030] 1) Pretreatment: transfer the fly ash in the fly ash bin to the pulverizer, and use the pulverizer to grind the fly ash to make the particle size equal to 80 μm;

[0031] 2) Deployment: transfer the pretreated fly ash to a stirring pre-mixer, add silicon-aluminum conditioner and hot water to the stirring pre-mixer, and obtain a mixture liquid after stirring for 10 hours. The molar content ratio between calcium, silicon and aluminum elements in the liquid meets the generation requirement of zeolite aluminosilicate mineral tobermorite, and the liquid-solid ratio of water and mixed ash sample in the mixed material liquid is 10: 1mL / g; Wherein, the silicon-aluminum conditioning agent is configured through the silicon-aluminum conditioning agent batching device, and the silicon-alumin...

Embodiment 2

[0040] The method for synchronously stabilizing heavy metals and degrading polycyclic aromatic hydrocarbons in the waste incineration fly ash of this embodiment comprises the following steps:

[0041] 1) Pretreatment: transfer the fly ash in the fly ash bin to the pulverizer, and use the pulverizer to grind the fly ash to make the particle size equal to 75 μm;

[0042] 2) Deployment: Transfer the pretreated fly ash to a stirring pre-mixer, add silicon-aluminum conditioner and hot water to the stirring pre-mixer, and obtain a mixed material liquid after stirring for 9 hours. The mixed material The molar content ratio between calcium, silicon and aluminum elements in the liquid meets the generation requirement of zeolite aluminosilicate mineral tobermorite, and the liquid-solid ratio of water and mixed ash sample in the mixed material liquid is 8: 1mL / g; Wherein, the silicon-aluminum conditioning agent is configured through the silicon-aluminum conditioning agent batching device...

Embodiment 3

[0051] The method for synchronously stabilizing heavy metals and degrading polycyclic aromatic hydrocarbons in the waste incineration fly ash of this embodiment comprises the following steps:

[0052] 1) Pretreatment: transfer the fly ash in the fly ash bin to the pulverizer, and use the pulverizer to grind the fly ash to make the particle size equal to 77 μm;

[0053] 2) Deployment: transfer the pretreated fly ash to a stirring pre-mixer, add silicon-aluminum conditioner and hot water to the stirring pre-mixer, and obtain a mixture liquid after stirring for 10 hours. The molar ratio between calcium, silicon and aluminum elements in the liquid meets the generation requirements of the zeolite aluminosilicate mineral tobermorite, and the liquid-solid ratio of water and mixed ash sample in the mixed material liquid is 5: 1mL / g; Wherein, the silicon-aluminum conditioning agent is configured through the silicon-aluminum conditioning agent batching device, and the silicon-aluminum c...

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Abstract

The invention relates to a method of synchronously stabilizing heavy metals and degrading polycyclic aromatic hydrocarbons from waste incineration fly ash. The method comprises the following steps: 1)pretreatment: grinding the fly ash, wherein the grain sizes of the fly ash are smaller than or equal to 80 [mu]m; 2) blending: adding a silicon-aluminum conditioning agent into the pre-treated fly ash to obtain a mixed ash sample, adding hot water into the mixed ash sample, and stirring and activating the mixed ash sample for 8-10 h to obtain mixed slurry, wherein the molar ratio among calcium, silicon and aluminum in the mixed slurry meets the generation demand of a zeolite aluminosilicate mineral tobermorite, and the liquid-solid ratio of water and the mixed ash sample in the mixed slurry is (5-10): 1 mL / g; 3) hydrothermal reaction: adding the mixed slurry into a closed hydrothermal reaction kettle, pumping hydrogen peroxide into the hydrothermal reaction kettle and then raising the temperature to 150-200 DEG C for the hydrothermal reaction, wherein the mass fraction of the hydrogen peroxide is 30%, and the liquid-solid ratio of the hydrogen peroxide and the mixed ash sample is 0.25-1 mL / g; and 4) separation: carrying out dehydrating separation on a product obtained by the hydrothermal reaction to obtain a solid phase product and waste liquor.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, in particular to a method for synchronously stabilizing heavy metals and degrading polycyclic aromatic hydrocarbons with waste incineration fly ash. Background technique [0002] Incineration has become a commonly used treatment method for waste. Compared with other waste treatment methods, such as landfill and composting, incineration can reduce waste volume by 90% and reduce quality by 60-70%. In addition, the incineration method can decompose toxic and harmful wastes into non-toxic and harmless simple compounds, and can effectively recover energy resources. The heat generated can be used for heating and power generation. The best choice for solid waste. [0003] After waste incineration, a certain amount of fly ash will be produced. Fly ash refers to the residues collected in the flue gas purification system and heat recovery and utilization system (such as economizer, waste he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/38A62D3/30B09B3/00A62D101/08A62D101/20A62D101/43
CPCA62D3/30A62D3/38B09B3/00A62D2101/08A62D2101/20A62D2101/43B09B3/10B09B2101/30Y02W30/20
Inventor 石德智张金露胡春艳王攀古励魏云梅
Owner CHONGQING UNIV
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