Method for extracting noble metal from waste print circuit board surface and its dedicated clamp
A printed circuit board and precious metal technology, applied in the field of electronic waste recycling, can solve the problem of secondary pollution of harmful gases, achieve low recycling costs, avoid acid waste water, and reduce treatment costs
Inactive Publication Date: 2007-08-01
BEIJING UNIV OF TECH
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Problems solved by technology
The residue after extracting precious metals by this method is easier to handle, and has significant economic benefits, and is more widely used than pyrometallurgy. However, because a large amount of organic matter after crushing is removed by heating, it will still produce more harmful gases and cause secondary pollution.
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Embodiment Construction
[0024] The effects of the present invention will be described below through specific processing examples.
[0025] Install the PCB in the lithium battery of the discarded mobile phone on the jig made by the present invention, place the end with the precious metal on the surface of the PCB horizontally upward, and use the conveying device to send the discarded PCB to the mechanical pretreatment area. There are four pieces of 2 on the surface of the PCB. ×2mm square precious metal area, the grinding machine will intensively polish these precious metal areas enriched on the surface of the PCB, the polished PCB will automatically fall off from the fixture when it goes to the PCB recycling area, and the pretreated PCB needs to be processed in the next step. The precious metal powder removed from the surface of the discarded PCB is collected by a brush, and then the gold is extracted by a wet method. Since the back of the PCB (the side opposite to the precious metal-enriched side) h...
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Abstract
The invention relates to a method for extracting noble metal from surface of waste printed circuit board and special clamp device, belonging to electrical waste recoverying technique field. The current technique for noble metal recovery from electrical waste such as fire metallurgy and wet metallurgy will cause environmental pollution and the cost is high. The invention employs partial automatic mechanical pretreating to reduce pollution and cost. The invention mainly comprises mechanical pretreating and wet metallurgy, fixes waste PCB with special clamp, the sutomatic conveying device carries special clamp to mechanical pretreating place to pretreat PCB and gets noble metal powder, extracts noble metal with wet metallurgy. The invention employs combined way, which can treat waste noble metal on surface of PCB more efficiently. It is characterized by low production cost, high efficiency, no pollution and application in waste electrical resource recovery research.
Description
Technical field: [0001] It belongs to the technical field of recycling electronic waste, realizes the recycling and reuse of electronic waste resources, and avoids secondary pollution at the same time, so as to ensure the sustainable development of the electronic industry. Background technique: [0002] The present invention is a recycling process researched and developed for the precious metals on the surface of waste printed circuit boards (PCB for short). Developed capitalist countries have begun to study the technology of recovering precious metals from electronic waste as early as the 1970s. After the 1990s, large-scale production has basically been formed, and the economic benefits produced have far exceeded the treatment of other municipal solid wastes. . In the 1980s, the United States had special organizations engaged in recycling waste computers, electronic communication equipment, and military electronic waste, and then sent them to specialized manufacturers to e...
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IPC IPC(8): C22B3/06C22B7/00
CPCY02P10/20
Inventor 夏志东丁涛雷永平郭福史耀武王素云刘建勇
Owner BEIJING UNIV OF TECH