Method for extracting copper from waste circuit boards

A technology of waste circuit boards and electrolyzers, which is applied to the improvement of process efficiency, photography technology, instruments, etc., to achieve the effects of increasing investment equipment costs, reducing energy consumption, and reducing heavy loads

Inactive Publication Date: 2011-06-29
广东奥美特集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] At present, because the mechanical method is in the early stage of research and development, the existing mechanical physical recycling methods still only focus on the rough recovery of metals in circuit boards, and seldom involve the recycling and harmlessness of non-metallic components that account for more than 50% of the total.

Method used

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Embodiment Construction

[0018] A method for extracting copper from waste circuit boards according to the present invention The method steps include the following steps:

[0019] (1) First-stage crushing of waste circuit boards by shearing;

[0020] (2), to the second stage crushing of the material heavy hammer type after step (1) crushing;

[0021] (3), medium-speed winnowing third-stage pulverization of the material after step (2) crushing;

[0022] (4), carry out magnetic separation and electrostatic separation to step (3) gained material;

[0023] (5), step (4) gained mixed metal material is added in sulfuric acid solution and dissolved, and copper and zinc, nickel etc. are transferred in the solution, and when the alloy containing lead, tin reacts with sulfuric acid, generate insoluble lead sulfate, gold, Silver, palladium, etc. are insoluble substances.

[0024] It has the following advantages: the traditional first-stage heavy hammer crushing is replaced by shear crushing, so as to relieve t...

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Abstract

The invention relates to a method for extracting copper from waste circuit boards, comprising the following steps: crushing the waste circuit boards for the first time by cutting, crushing the waste circuit boards for the second time by a heavy punch, and crushing the waste circuit boards for the third time by air separation at medium speed; magnetically separating mixed metal materials, adding the mixed metal materials to a sulfuric acid solution for dissolving to transfer copper, zinc, nickel and the like into the solution; and transferring the leaching solution into an electrolytic bath so that copper gains electrons at the cathode and pure copper is precipitated. The method provided by the invention can reduce the production cost and has high copper recovery rate.

Description

technical field [0001] The invention relates to a method for recycling waste electronics, in particular to a method for extracting copper from waste circuit boards. Background technique [0002] Printed circuit boards are referred to as PCBs, and the PCB market is growing rapidly. At the same time, the amount of waste is also increasing sharply, becoming one of the main sources of electronic waste. The PCB structure is complex, usually containing 30% plastic, 30% inert oxide and 40% metal. There are many harmful substances and a large amount of valuable substances in waste PCB. Any inappropriate disposal will not only cause great harm to the environment, but also prevent the recycling of valuable substances, which will bring great harm to the environment. A heavier burden. On the contrary, using appropriate recycling technology to recycle circuit boards can not only avoid secondary pollution, but also bring good economic benefits, recycle renewable resources, and effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/08C25C1/12C22B15/00
CPCY02P10/20
Inventor 林春涛蔡莎莎
Owner 广东奥美特集团有限公司
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