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Method for treating heavy metal in solid waste incineration fly ash through magnetite modification

A technology for solid waste and fly ash incineration, which is applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc. It can solve the problems of secondary wastes that are rarely discussed, and achieve rich raw materials and extraction effects. Good, simple craftsmanship

Inactive Publication Date: 2019-11-19
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrometallurgical processes have obvious advantages in fly ash treatment, and this technique can be used to recover large quantities of metals such as copper, zinc, nickel, etc. from fly ash, however, secondary waste generated during these processes is rarely discussed ( solid residues and sewage)

Method used

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  • Method for treating heavy metal in solid waste incineration fly ash through magnetite modification

Examples

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Embodiment 1

[0040] A kind of embodiment of the method that the present invention utilizes magnetite modifier to process heavy metals in solid waste incineration fly ash, the method comprises the following steps:

[0041] (1) Leaching of heavy metals in fly ash containing copper, zinc, cadmium and lead: mix hydrochloric acid with a pH value of 2 and fly ash at a weight ratio of 14:1, and stir for 20 hours to obtain a leachate, and measure copper, The leaching rate of cadmium is close to 100%, and the leaching rate of zinc and lead is 80-85%;

[0042] (2) Extract metal zinc and copper: get 10 parts by volume of the leaching solution obtained in step (1) to adjust the pH value to 4, and then use 10 parts by volume of 5-nonylsalicylaldoxime concentration of 1mol / L of 5 -The mixed solution of nonylsalicylaldoxime and kerosene extracts it, obtains aqueous phase A and the organic phase of loading copper, then uses 10 parts by volume of dithiophosphonic acid 572 concentration to be the dithiophos...

Embodiment 2

[0045] A kind of embodiment of the method that the present invention utilizes magnetite or its modifiers to process heavy metals in solid waste incineration fly ash, the method comprises the following steps:

[0046] (1) Leaching of heavy metals in fly ash containing copper, zinc, cadmium and lead: mix hydrochloric acid with a pH value of 2 and fly ash at a weight ratio of 10:1, and stir for 18 hours to obtain a leachate, and measure copper, The leaching rate of cadmium is close to 100%, and the leaching rate of zinc and lead is 78-82%;

[0047] (2) Extract metal zinc and copper: get 10 parts by volume of the leaching solution obtained in step (1) to adjust the pH value to 4, and then use 8 parts by volume of 5-nonylsalicylaldoxime concentration of 1mol / L of 5 -The mixed solution of nonylsalicylaldoxime and kerosene extracts it, obtains aqueous phase A and the organic phase of loading copper, then uses 8 parts by volume of dithiophosphonic acid 572 concentration to be the dith...

Embodiment 3

[0050] A kind of embodiment of the method that the present invention utilizes magnetite or its modifiers to process heavy metals in solid waste incineration fly ash, the method comprises the following steps:

[0051] (1) Leaching of heavy metals in fly ash containing copper, zinc, cadmium and lead: mix hydrochloric acid with a pH value of 2 and fly ash at a weight ratio of 15:1, and stir for 24 hours to obtain a leachate, and measure copper, The leaching rate of cadmium is close to 100%, and the leaching rate of zinc and lead is 82-85%;

[0052] (2) Extract metal zinc and copper: get 10 parts by volume of the leaching solution obtained in step (1) to adjust the pH value to 4, and then use 15 parts by volume of 5-nonylsalicylaldoxime concentration of 1mol / L of 5 -The mixed solution of nonylsalicylaldoxime and kerosene extracts it, obtains aqueous phase A and the organic phase of loading copper, then uses 15 parts by volume of dithiophosphonic acid 572 concentration to be the di...

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Abstract

The invention provides a method for treating heavy metal in solid waste incineration fly ash through magnetite modification, and belongs to the technical field of environmental treatment and solid waste treatment. The method comprises the steps that the metal in the fly ash is leached with hydrochloric acid, then cadmium and lead in leachate are effectively removed through humic acid modified magnetite, and in addition, the 5-nonyl salicylaldoxime compounded in an aliphatic compound can be used for recovering copper in the leachate, zinc in the leachate is recovered through dithiophosphonic acid 572 compounded in an aliphatic or aromatic compound, thus, the heavy metal in the fly ash is recovered and removed, and synthesis treatment and resource recycling of the of heavy metal in the fly ash are achieved. The method is simple in process, environmentally friendly, easy to implement and suitable for mass production and engineering application, and has great significance for treating heavy metal in fly ash.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment and solid waste treatment, and relates to a method for treating heavy metals in solid waste incineration fly ash by using magnetite modifiers. Background technique [0002] Over the past few decades, incineration has become a widely popular alternative for municipal solid waste management worldwide due to the reduction of solid waste volumes and heat energy recovery. However, the incineration process produces large amounts of fly ash, which is often rich in leachable heavy metals and thus poses a serious threat to the environment and human health. Fly ash is classified as hazardous waste and must be disposed of properly to prevent environmental pollution. [0003] So far, many technologies have been developed for dealing with fly ash. The most commonly used rationale is to immobilize fly ash with a matrix, such as combined washing-immobilization, cementation (magnesium potassium ...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B13/00C22B17/00C22B19/20C22B15/00C22B3/30C22B3/38B01J20/02B01J20/28B01J20/30
CPCB01J20/02B01J20/28009B01J20/3085C22B7/007C22B7/02C22B13/045C22B15/0069C22B17/04C22B19/22C22B3/30C22B3/385Y02P10/20
Inventor 唐进峰吴启航苏敏华吴焰宏张鸿郭
Owner GUANGZHOU UNIVERSITY
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