New technique for recovering non-ferrous metal from waste and old printing circuit board

A technology for printed circuit boards and non-ferrous metals, which is used in the recycling process of waste printed circuit boards, can solve problems such as human health, threats to the surrounding environment, and large dust, and achieve pollution-free, low environmental pollution, and wide sorting levels. Effect

Inactive Publication Date: 2009-06-17
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrostatic sorting, eddy current sorting or airflow sorting, which are widely used today, are all dry sorting. When processing materials with small particle sizes, a large amount of dust will inevitably be generated, which poses a threat to human health and the surrounding environment.

Method used

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  • New technique for recovering non-ferrous metal from waste and old printing circuit board
  • New technique for recovering non-ferrous metal from waste and old printing circuit board
  • New technique for recovering non-ferrous metal from waste and old printing circuit board

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and example the present invention is further described:

[0019] Test materials: Waste printed circuit boards come from waste computers left idle in the laboratory. It has been verified that these computers were produced in the middle and late 1990s. The main metal elements in waste printed circuit boards were chemically analyzed. The analysis results are shown in Table 1.

[0020] Table 1 Contents of main metal elements in waste printed circuit boards

[0021]

[0022] Send the waste printed circuit board 1 into the shearing machine 2, and through the shearing machine 2, the whole circuit board is cut into small pieces 21 smaller than 70 mm; then enter the pulverisette 19 general cutting grinder 3 for further crushing to obtain the particle size The fine-grained material 31 smaller than 0.5mm; the fine-grained material and an appropriate amount of water are sent to the stirring tank 4 for stirring, and the stirring time...

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PUM

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Abstract

The invention discloses a novel process for recovering nonferrous metals in discarded printed circuit boards. The process adopts methods of shearing, crushing and oscillating table sorting, and passes the discarded printed circuit boards through a shearing machine, a cutting and grinding machine, an agitation tank, an oscillating table and a magnetic separator for initial shearing, crushing, agitation and sorting sequentially to obtain a concentrate of nonferrous metals such as copper, lead, zinc, nickel and tin and a concentrate of plastic and to realize the overall recovery of the nonferrous metals in the discarded printed circuit boards. The oscillating table sorting method can realize the recycling of superfine material grains, avoid dust pollution in the sorting process and recycle water resources, has the advantages of wide sorting grade range, small environmental pollution and so on, and has wide practicality.

Description

technical field [0001] The invention relates to a recovery process of waste printed circuit boards, in particular to a wet physical recovery process of non-ferrous metals in waste printed circuit boards. Background technique [0002] In recent years, with the development and progress of society, the amount of electronic waste is increasing at an alarming rate. As an important part of electronic products, printed circuit boards exist in almost all electronic equipment. Therefore, the rapid increase in the amount of electronic waste also indicates the rapid increase in the amount of waste printed circuit boards. The metal content in printed circuit boards accounts for about 40%, and the main valuable metals are non-ferrous metals, and the content of copper, tin, gold, silver and other elements in printed circuit boards is higher than that in the ore currently mined. Therefore, waste printed circuit boards have a high recycling value. [0003] At present, the most commonly us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B5/04B03B1/00B03C1/00
Inventor 宋永胜李丽温建康徐政
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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