A Dry Sorting and Recovery Process for Valuable Components in Waste Circuit Boards

Abstract

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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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a dry separation and recovery process for valuable components in waste circuit boards to solve the problems of narrow range of applicable feed particle size and low recovery efficiency caused by the existing single physical recovery technology. The problem

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