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

A printed circuit board, recycling technology, applied in the direction of electronic waste recycling, recycling technology, manufacturing tools, etc., can solve the problems of increased energy consumption, increased cost of liquid nitrogen, complicated procedures, etc., to reduce pollution, improve purity, The effect of simplifying the process

Inactive Publication Date: 2005-03-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ma...

Method used

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

Examples

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Effect test

example 1

[0040] Example 1: Remove the electrolytic capacitor and aluminum heat sink on the discarded computer motherboard, and then put the remaining PCB into a hammer crusher, using a wire mesh with a diameter of 3mm. After crushing, the separation of metal and non-metal reaches 95%. Above; use standard sieves such as 5 mesh, 10 mesh, 20 mesh, 26 mesh and 30 mesh to sieve the pulverized particles, and the particles of various meshes are separated by hydrocyclone method to separate metal and non-metallic materials, and the particles are centrifugally rotated The rotation speed is 50rpm, and after standing for 30s, the suspended material is released and filtered. The non-metallic material is on the top of the filter, and the water can be recycled; the material that sinks at the bottom of the suspension container contains more than 90% metal; the separation effect is shown image 3 .

[0041] The selected electrolytic capacitors are crushed by a hammer crusher, and a wire mesh with a dia...

example 2

[0042] Example 2: the discarded welder power supply plate is fixed on the fixture made by the present invention, and the components are cut off from the substrate by using a shearing machine, thereby realizing 100% separation of the components and the substrate; from the separated components Manually pick out the electrolytic capacitors and coil windings. The length of the two arms of the fixture is 200mm, the thickness of the arm is 15mm, and the width of the arm is 15mm; the unilateral through groove is 3mm deep and 1.5mm wide, and the groove is 1.5mm away from one side of the two arms. Two 45 steel rods are used to mill the groove and then screw mechanically connected.

[0043] Cut the circuit board directly into small pieces of 100mm×100mm with a shearing machine, put the small pieces into a hammer crusher, use a wire mesh with a diameter of 3mm, and after crushing, the separation of metal and non-metal reaches more than 99%; Half of the particles were sieved with standar...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): B09B3/00B23Q3/06
CPCY02P70/10Y02W30/82
Inventor 夏志东雷永平史耀武任彦斌郭福刘建萍
Owner BEIJING UNIV OF TECH
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