Method for extracting metallic copper from waste circuit board

A technology for extracting metals from waste circuit boards, which is applied in the field of environmental science and can solve problems such as failure of extraction agents, low purity of cathode copper, and environmental pollution

Inactive Publication Date: 2015-01-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the leaching rate of copper in the process of wet copper extraction is not high and the release of NOx will pollute the environment, and the acidity of the leaching solution is too high to affect the extraction reaction, and the strong oxidant will make the extraction agent invalid and the extracted cathode copper Purity is not high technical problems and provides a method for extracting metal copper from waste circuit boards, the method realizes the resource reuse of waste circuit boards, saves resources and protects the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A method for extracting metal copper from waste circuit boards, comprising the following steps:

[0056] (1) Crushing of waste circuit boards

[0057] The waste circuit boards from which components have been removed are broken into 3 kg blocks, then pulverized with a pulverizer, and then passed through a 30-mesh sieve. Separation, and then subjecting the obtained metal particle powder to electroselection to remove part of the iron in the metal particle powder, thereby obtaining a metal-enriched body with a higher copper content;

[0058] In the obtained metal-rich body, calculated by weight percentage, the contents of each metal are: Cu 75%, Fe 7.5%, Al 2.1%, Pb 2.7%, Zn 0.7%, Mn 0.1%, Ag+As+Au+Ba +K+Li+Na+Ni is less than 0.1%, and the balance is non-metallic components;

[0059] (2), leaching of copper ions

[0060] First add 10L of water to the titanium reactor, then add 300g of sodium chlorate and 0.3L of concentrated sulfuric acid during stirring, and mix to prep...

Embodiment 2

[0078] A method for extracting metal copper from waste circuit boards, comprising the following steps:

[0079] (1) Crushing of waste circuit boards

[0080] The waste circuit boards from which components have been removed are broken into 3 kg blocks, then pulverized with a pulverizer, and then passed through a 30-mesh sieve. Separation, and then subjecting the obtained metal particle powder to electroselection to remove part of the iron in the metal particle powder, thereby obtaining a metal-enriched body with a higher copper content;

[0081] In the obtained metal-rich body, calculated by weight percentage, the contents of each metal are: Cu 75%, Fe 7.5%, Al 2.1%, Pb 2.7%, Zn 0.7%, Mn 0.1%, Ag+As+Au+Ba +K+Li+Na+Ni is less than 0.1%, and the balance is non-metallic components;

[0082] (2), leaching of copper ions

[0083] First add 10L of water to the titanium reactor, then add 350g of sodium chlorate and 0.8L of concentrated sulfuric acid during stirring, and mix to prep...

Embodiment 3

[0100] A method for extracting metal copper from waste circuit boards, comprising the following steps:

[0101] (1) Crushing of waste circuit boards

[0102] Break the waste circuit boards from which components have been removed into 3 kg blocks, then use a pulverizer to grind them into 30-mesh particle powder, and then carry out air separation to separate metal particles and non-metal particles to increase the metal content , and then perform electroselection to remove part of the iron in the mixed metal particles to improve the purity of the leached copper, thereby obtaining a metal-enriched body with a higher metal content;

[0103] In the obtained metal-rich body, calculated by weight percentage, the contents of each metal are: Cu 75%, Fe 7.5%, Al 2.1%, Pb 2.7%, Zn 0.7%, Mn 0.1%, Ag+As+Au+Ba +K+Li+Na+Ni is less than 0.1%, and the balance is non-metallic components;

[0104] (2), leaching of copper ions

[0105] First add 10L of water to the titanium reactor, then add 250g...

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Abstract

The invention discloses a method for extracting metallic copper from a waste circuit board. The method comprises the following steps: firstly, crushing the waste circuit board from which elements and parts are removed into blocks, crushing by virtue of a crusher, and sieving by a 30-mesh sieve; sequentially carrying out winnowing and electric separation on the obtained granular powder to obtain a metal concentrate with relatively high copper content; leaching copper ions from the metal concentrate by using a leaching agent water solution which is composed of sodium chlorate, sulfuric acid and water; removing solid substances from the obtained leaching liquid by centrifugal separation or filter press filtration; carrying out five-stage extraction and second-stage reverse extraction on the obtained filtrate to obtain a copper-enriched solution, carrying out electrodeposition on the obtained copper-enrich solution by virtue of an electrode method, thus finally obtaining copper of which the purity is over 99.99% on the cathode material, so as to finish extraction of the metallic copper from the waste circuit board. According to the method disclosed by the invention, the metallic copper can be efficiently extracted from the waste circuit board; the method has the technical characteristics of high efficiency, energy saving, low cost, simple process and the like and is capable of achieving recycling and innocent treatment of the waste circuit board.

Description

technical field [0001] The invention belongs to the field of environmental science and technology, and relates to a treatment method for electronic waste in solid waste, in particular to a method for extracting metal copper from waste circuit boards, so as to realize harmless and resourceful utilization of waste circuit boards. Background technique [0002] The printed circuit board is the support for the electrical connection of electronic components in electrical products. With the acceleration of the upgrading of various electrical products, more and more are being eliminated. If these waste circuit boards are discarded directly, the heavy metals in the circuit boards and the polymer materials on the substrate will cause huge pollution to the surrounding environment. At the same time, the valuable metals in the waste circuit boards are not recycled, resulting in waste. Using appropriate recycling technology to recycle waste circuit boards can not only avoid secondary pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C22B7/00C22B15/00
CPCC22B15/0067C22B15/0086C25C1/12Y02P10/20
Inventor 时鹏辉姚伟峰周雪君周笑绿郑红艾胡晨燕蒋路漫庞红建谭思宇
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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