Recovering and treating process for waste printed circuit board and special clamp

Abstract

The present invention belongs to the field of electric appliance resource recovering and reusing technology. The technological process of recovering and treating waste printed circuit board includes the following steps: sorting printed circuit boards; separating electrolytic capacitor and other elements and devices mechanically from the printed circuit board; crushing printed circuit board, sieving and separating metal and non-metal gravitationally or electrostatically; crushing electrolytic capacitor, separating the shell metal, separating metal and non-metal of electrolytic capacitor gravitationally, crushing other elements and devices, separating metal and non-metal of other elements and devices gravitationally. The special clamp for separating electrolytic capacitor and other elements and devices mechanically from the printed circuit board is an L-shaped one with continuous single-end notches in two arms.

Description

technical field [0001] It belongs to the technical field of resource recovery and reuse of waste electronic and electrical products to ensure the pollution-free and sustainable development of the electronic industry. Background technique [0002] The present invention is a recovery treatment process researched and developed for the printed circuit board (printed circuit board, PCB) produced by a large number of waste electronic and electrical products. Almost all countries in the world are facing the problem of recycling waste electrical appliances. At present, some discrete material components such as chassis and plastic shells can be recycled, while PCBs, displays, etc. are almost not recycled due to immature recycling methods, high investment costs for recycling, and technical reasons. PCB is mainly composed of a large amount of substrate materials, a certain amount of common metals and a small amount of precious metals, which contain many heavy metals and other toxic an...

AI Technical Summary

Problems solved by technology

Patent CN98105592 recovers valuable substances from printed circuit boards, adopts high-speed shear crushing-high-speed crushing-impact crushing-ball milling-water tank separation, and finally heats the metal with an electric furnace, and separates different metals depending on their melting points, not only The process is complicated, and because the metal and non-metal are seriously bonded after ball milling, and the powder is fine, it is difficult to separate the metal and non-metal in the subsequent tank separation. At the same time, the metal must be ground into fine particle powder, which consumes a lot of energy; the patent USP5683040 uses a low-temperature crushing method. First remove the toxic components such as electrolytic capacitors on the PCB, pre-break the PCB into small pieces smaller than 30mm by mechanical means, and then soak the small pieces of PCB in liquid nitrogen to make them embrittled before crushing them by hammering, and then use screening and electrostatic, Magnetic force and eddy current separation technology, although the effect is very good, but to cool the PCB and continue to add liquid nitrogen to the crusher in order to maintain low-temperature crushing, resulting in a large consumption of liquid nitrogen will bring a significant increase in cost, and low temperature on The equipment requirements will also be greatly increased, which will increase the processing cost and make it difficult to maintain the operation. At the same time, the patent also requires electric heating to maintain the temperature and humidity of the sample and the environment during electrostatic separation, which further increases energy consumption and processing costs. Further improvement; In addition, the dismantled electrolytic capacitors are not processed in this technology

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