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
CN109402404BActive Publication Date: 2020-05-12UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Publication Date
2020-05-12

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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.
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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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