A Dry Sorting and Recovery Process for Valuable Components in Waste Circuit Boards
A waste circuit board and dry process technology, which is applied in the field of dry separation and recovery of valuable components in waste circuit boards, can solve the problems of narrow feed particle size range and low recovery efficiency, and achieve efficient separation and recovery. , Improve quality and reduce environmental pollution
A waste circuit board and dry process technology, which is applied in the field of dry separation and recovery of valuable components in waste circuit boards, can solve the problems of narrow feed particle size range and low recovery efficiency, and achieve efficient separation and recovery. , Improve quality and reduce environmental pollution
CN107442549BActive Publication Date: 2019-06-11CHINA UNIV OF MINING & TECH
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[0054] The present invention is a dry sorting and recovery process for valuable components in waste circuit boards, the specific process is as follows figure 1 As shown, the dry separation and recovery process of valuable components in the waste circuit boards of computers in this embodiment is as follows:
[0055] Step 1. Disassemble the discarded circuit board of the computer to obtain a 5kg bare board of the discarded circuit board of the computer after dismantling, and the components obtained by dismantling the discarded circuit board of the computer go through the component classification and performance testing process to obtain There are three types of reusable components, components with high metal content and toxic and harmful components; in this embodiment, the discarded circuit boards of the computer are disassembled to obtain the components on the discarded circuit boards as resistors, capacitors, inductors, diodes, and triodes , relays, integrated circuits, etc., ...
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A dry separation and recovery process for recovering a valuable constituent from a waste circuit board comprises: step 1. dismantling a waste circuit board to obtain a bare waste circuit board; step 2. removing a solder from the bare waste circuit board; step 3. sequentially performing coarse crushing and fine crushing on the bare waste circuit board from which the solder has been removed to obtain granulated particles of the waste circuit board; step 4. performing sieving and classification of the granulated particles of the waste circuit board to obtain materials having grain sizes of -2+1 mm, -1+0.5 mm, -0.5+0.3 mm, -0.3+0.125 mm, -0.125+0.074 mm and -0.074 mm; step 5. respectively supplying the materials to different dry physical separation apparatuses to undergo separation operations; and step 6. respectively recovering a metal concentrate and a non-metal concentrate obtained by the separation operations performed by the respective apparatus. The present invention employs several physical separation techniques to separate metal constituents and non-metal constituents from materials having different grain sizes, thereby obtaining a high-grade metal concentrate product after separation, and achieving a high recovery rate. The separation process causes less environmental contamination.
Description
technical field [0001] The invention relates to the technical field of recycling electronic waste resources, in particular to a dry sorting and recycling process for valuable components in waste circuit boards. Background technique [0002] In recent years, the rapid development of integrated circuit technology and its products has made electronic circuit boards (PCBs) an indispensable and important component in the modern information industry. The demand for product functions is getting higher and higher, and a large number of discarded circuit boards are produced in the process of replacing and eliminating various electronic products. The annual growth rate of electronic waste reaches 16% to 28%. As an important part of electronic products, waste circuit boards are very complex in material composition and combination, and the degree of dissociation of monomers is small. It is difficult to separate metal components and non-metal components. Its comprehensive recycling has a...
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Patent Timeline
11 Jun 2019
Publication
CN107442549B
- IPC
- B09B3/00; B02C21/00; B02C23/14; B07B1/28; B07B9/02; B07B7/00; B07B7/12; B03C7/02; B03C1/00
- CPC
- B02C21/00; B02C23/14; B03C1/00; B03C7/02; B07B1/28; B07B7/00; B07B7/12; B07B9/02
- Inventors
- 贺靖峰; 姚亚科