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A method for extracting valuable metals from waste incineration ash

A technology for waste incineration ash and valuable metals, applied in chemical instruments and methods, process efficiency improvement, instruments and other directions, can solve the problems of heavy metal pollution, low extraction rate of valuable metals, etc., to achieve a short process, avoid heavy metal pollution, The effect of a wide source of raw materials

Active Publication Date: 2020-05-12
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems of low extraction rate of valuable metals and heavy metal pollution during resource utilization of waste incineration ash, the present invention provides a method for extracting valuable metals from waste incineration ash; adopting physical separation and hydrometallurgical methods to extract And separate the valuable metals in the waste incineration ash. The basic principle is: firstly, use magnetic separation and eddy current separation to obtain ferromagnetic metals, copper and aluminum; Iron hydroxide, copper and zinc are obtained by electrowinning; the tail liquid is recycled; and heavy metal pollution from residues is avoided

Method used

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  • A method for extracting valuable metals from waste incineration ash
  • A method for extracting valuable metals from waste incineration ash

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The magnetic separator is set to export ferromagnetic metals with a relative magnetic permeability > 5, and to export non-ferrous ash with a relative magnetic permeability ≤ 5. The waste incineration ash is subjected to magnetic separation to obtain ferromagnetic metal and non-ferrous ash.

[0038] The set conductivity of the eddy current separator is ≥45×10 6 s m -1 For scrap copper export, 45×10 3 s m -1 ≤Conductivity6 s m -1 For the export of waste miscellaneous aluminum, the electrical conductivity is less than 45×10 3 s m -1 for the export of waste incineration ash tailings. The non-iron ash is sorted by eddy current to obtain waste miscellaneous copper, waste miscellaneous aluminum and waste incineration ash tailings.

[0039]The waste incineration ash tailings were dissolved with 1mol / L sulfuric acid, the liquid-solid mass ratio was 4:1, the acid hydrolysis temperature was 20°C, and the acid hydrolysis time was 4 hours, followed by 0.2MPa pressure filtrati...

Embodiment 2

[0041] The magnetic separator is set to export ferromagnetic metals with a relative magnetic permeability > 5, and to export non-ferrous ash with a relative magnetic permeability ≤ 5. The waste incineration ash is subjected to magnetic separation to obtain ferromagnetic metal and non-ferrous ash.

[0042] The set conductivity of the eddy current separator is ≥45×10 6 s m -1 For scrap copper export, 45×10 3 s m -1 ≤Conductivity6 s m -1 For the export of waste miscellaneous aluminum, the electrical conductivity is less than 45×10 3 s m -1 for the export of waste incineration ash tailings. The non-iron ash is sorted by eddy current to obtain waste miscellaneous copper, waste miscellaneous aluminum and waste incineration ash tailings.

[0043] The waste incineration ash tailings were dissolved with 1.5mol / L sulfuric acid, the liquid-solid mass ratio was 4.5:1, the acidolysis temperature was 25°C, and the acidolysis time was 3.8h, followed by 0.2MPa pressure filtration to ob...

Embodiment 3

[0045] The magnetic separator is set to export ferromagnetic metals with a relative magnetic permeability > 5, and to export non-ferrous ash with a relative magnetic permeability ≤ 5. The waste incineration ash is subjected to magnetic separation to obtain ferromagnetic metal and non-ferrous ash. The set conductivity of the eddy current separator is ≥45×10 6 s m -1 For scrap copper export, 45×10 3 s m -1 ≤Conductivity6 s m -1 For the export of waste miscellaneous aluminum, the electrical conductivity is less than 45×10 3 s m -1 for the export of waste incineration ash tailings. The non-iron ash is sorted by eddy current to obtain waste miscellaneous copper, waste miscellaneous aluminum and waste incineration ash tailings.

[0046] The waste incineration ash tailings were dissolved with 2mol / L sulfuric acid, the liquid-solid mass ratio was 5:1, the acidolysis temperature was 30°C, and the acidolysis time was 3.6h, followed by 0.3MPa pressure filtration to obtain the acid...

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Abstract

The invention provides a method for extracting valuable metals from garbage incineration ash, which belongs to the technical field of comprehensive utilization of resources. The method adopts physical separation-hydrometallurgy to extract and separate the valuable metals in the waste incineration ash, specifically: the waste incineration ash is magnetically separated to recover ferromagnetic metals, and then eddy current separation is used to recover non-ferrous metals; The tailings after current separation are subjected to acidolysis and pressure filtration to obtain an acidolysis solution, and the acidolysis solution is sequentially extracted with copper ions, and copper is extracted by electrowinning; the copper raffinate after the extraction of copper ions is sequentially neutralized to remove iron, Extraction of zinc ions, zinc electrowinning. The method of the invention realizes the recovery of ferromagnetic metals and non-ferrous metals such as copper, aluminum and zinc from garbage incineration ash, has the advantages of high efficiency, precision, no pollution and low cost, and is suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and utilization, and in particular relates to a method for extracting valuable metals from garbage incineration ash. Background technique [0002] In 2017, my country's domestic garbage removal volume was about 236 million tons, and the accumulated stockpile reached 7 billion tons, covering an area of ​​more than 800,000 mu, and continued to grow with the rapid development of my country's economy. Garbage incineration is an important method for the harmless treatment of domestic garbage in my country, and the treatment rate can reach 40%. Waste incineration ash, including bottom ash and fly ash, is the main by-product of domestic waste incineration, accounting for about 20-30% of the mass of incinerated waste. Garbage incineration ash contains toxic and harmful substances such as heavy metals. Improper disposal will endanger the environment and human health. In addition, ash contains a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/00C22B15/14C22B19/20C22B19/30C22B19/32C22B21/00C22B3/38C25C1/12C25C1/16C22B3/30B03C1/30
CPCB03C1/30C22B1/005C22B7/007C22B15/0071C22B19/22C22B19/30C22B19/32C22B21/0038C25C1/12C25C1/16C22B3/30C22B3/3846Y02P10/20
Inventor 张深根袁静舒刘波
Owner UNIV OF SCI & TECH BEIJING
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