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Method for treating garbage incineration fly ash

A waste incineration fly ash and treatment method technology, which is applied to chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problem of difficulty in the treatment of high-salt landfill leachate, damage to the solid stability of chelated fly ash, Reduce heavy metal capture efficiency and other issues, to achieve the effect of reducing the precipitation of heavy metal ions, not easy to precipitate, and less wastewater discharge

Inactive Publication Date: 2020-08-11
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the direct chemical stabilization method also has certain defects, such as the high content of soluble salts reduces the capture efficiency of chelating agents for heavy metals with low content but high toxicity in fly ash; soluble salts in chelated fly ash after landfill The loss of chelated fly ash solids will destroy the stability of chelated fly ash, and the treatment of high-salt landfill leachate is difficult, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a treatment method for waste incineration fly ash, the treatment method comprising the following steps:

[0051] (1) Mix fly ash and water according to the solid-liquid ratio of 1:5, stir for 30 minutes under the condition of 300 r / min, and carry out solid-liquid separation after standing for 45 minutes to obtain desalted fly ash. The unit of the solid-liquid ratio is g / L ;

[0052] (2) mix sodium formamate, dipotassium hydrogen phosphate and step (1) gained desalted fly ash, carry out heavy metal stabilization treatment, obtain heavy metal stabilized fly ash; The addition amount of described formamic sodium is 1% of desalted fly ash mass; The addition of dipotassium hydrogen phosphate is 0.8% of the quality of desalted fly ash;

[0053] (3) Mix cement with the heavy metal-stabilized fly ash obtained in step (2), solidify and wrap, extrude and seal with a sealed bag to complete the treatment of the fly ash; the amount of cement added is 8% of t...

Embodiment 2

[0055] This embodiment provides a treatment method for waste incineration fly ash, the treatment method comprising the following steps:

[0056] (1) Mix fly ash and water according to the solid-liquid ratio of 1:3, stir for 45 minutes under the condition of 250 r / min, and carry out solid-liquid separation after standing for 54 minutes to obtain desalted fly ash. The unit of the solid-liquid ratio is g / L ;

[0057] (2) mixing potassium thiram, potassium dihydrogen phosphate and step (1) gained desalted fly ash, carrying out heavy metal stabilization treatment, obtaining heavy metal stabilized fly ash; The addition of potassium dihydrogen phosphate is 0.5% of the quality of desalted fly ash;

[0058] (3) Mixing cement with the heavy metal stabilized fly ash obtained in step (2), solidifying and wrapping, extruding and sealing with a sealed bag to complete the treatment of the fly ash; the amount of cement added is 6% of the weight of the heavy metal stabilized fly ash.

Embodiment 3

[0060] This embodiment provides a treatment method for waste incineration fly ash, the treatment method comprising the following steps:

[0061] (1) Mix fly ash and water according to the solid-liquid ratio of 1:4, stir for 18 minutes under the condition of 400 r / min, and carry out solid-liquid separation after standing for 36 minutes to obtain desalted fly ash. The unit of the solid-liquid ratio is g / L ;

[0062] (2) mixing polyethyleneimine modified water-soluble polymer chelating agent, sodium dihydrogen phosphate and the desalted fly ash obtained in step (1), carrying out heavy metal stabilization treatment to obtain heavy metal stable fly ash; the polyethyleneimine modified The added amount of water-soluble polymer chelating agent is 2% of the mass of desalted fly ash; the added amount of sodium dihydrogen phosphate is 0.5% of the mass of desalted fly ash; the polyethyleneimine modified water-soluble polymer chelating agent The mixture is the solid heavy metal ion chelat...

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Abstract

The invention provides a method for treating garbage incineration fly ash. The method for treating the garbage incineration fly ash comprises the following steps of cleaning the fly ash by using a cleaning solution, and obtaining cleaning residual liquid and desalted fly ash after solid-liquid separation; (2) mixing a chelating agent, a stabilizing agent and the desalted fly ash obtained in the step (1), and carrying out heavy metal stabilizing treatment to obtain heavy metal stabilized fly ash; and (3) mixing cement and the heavy metal stabilized fly ash obtained in the step (2), and carryingout solidifying, wrapping, bagging and sealing to finish the treatment of the fly ash. According to the method for treating the garbage incineration fly ash, the fly ash is desalted firstly, so thatthe fly ash is reduced; moreover, the removal of dissolved salt is beneficial to the stability after solidification and wrapping, and the risk that heavy metal ions are separated out again due to long-time landfill of the fly ash is reduced, so that the effective treatment of the fly ash is realized.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and relates to a treatment method for waste incineration fly ash, in particular to a treatment method for solidification and stabilization of waste incineration fly ash. Background technique [0002] Waste incineration fly ash is the fine particulate matter captured in the flue gas pollution control process of domestic waste incineration. Its main components include SiO 2 , NaCl, KCl, CaAl 2 Si 2 o 8 , CaCO 3 and CaSO 4 etc., the soluble salt content is higher. Although the content of toxic metals such as Cd, Pb, Cu, Zn, Hg and Cr is only 1-5%, their leaching concentration is high, so fly ash belongs to hazardous waste. According to the laws of our country, fly ash must be processed to reduce its risk before entering the landfill for safe landfill or further utilization. [0003] At present, the stabilization methods of heavy metals in fly ash include high-temperature meltin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00A62D3/33A62D101/08
CPCB09B3/00B09B5/00A62D3/33A62D2101/08B09B2101/30B09B3/25
Inventor 童立志胡清陈彤韦黎华王峰王宏
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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