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Breaking and high tension electrostatic separating method for worn-out printed circuit board

A technology of printed circuit boards and waste circuit boards, which is applied in the field of industrial waste treatment and recycling, and can solve the problems of low sorting efficiency of airflow sorter, inability to effectively sort materials, and great influence of material shape, etc., and achieve structural Simple, low cost, and the effect of reducing environmental pollution

Inactive Publication Date: 2005-08-17
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

There are also too many classifications, the separation efficiency of the airflow separator is low, it is greatly affected by the shape of the material, and the fine-grained (-0.074mm) material cannot be effectively separated, etc.

Method used

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  • Breaking and high tension electrostatic separating method for worn-out printed circuit board
  • Breaking and high tension electrostatic separating method for worn-out printed circuit board

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Embodiment Construction

[0015] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0016] The flow process of the inventive method is as figure 1 As shown, it includes three processes: crushing waste printed circuit boards, further pulverizing the crushed particles, and conducting high-voltage electrostatic separation of metal and non-metal particles. First, use the conveyor belt to transport the waste circuit boards to the double-toothed roller crusher, crush the waste circuit boards into fragments with a particle size of 5mm to 20mm, and then use the conveyor belt to transport the waste circuit board fragments with a particle size of 5mm to 20mm to the high-speed impact crusher , and further crush the waste printed circuit boards into particles of 0.06mm to 0.5mm. Then the pulverized particles are sent to high-voltage electrostatic separation equipment, and the metal substances and non-metal substances in the mixed materi...

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PUM

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Abstract

The crushing and high voltage electrostatic separation process of waste printed circuit board includes first crushing waste printed circuit board into 5-20 mm fragments, then pulverized into 0.06-0.5 mm grains and final separating metal grains from non-metal grains. The pulverized grains are fed to separating roller in high voltage electrostatic separating apparatus homogeneously and bombarded with negative ions the corona electrode generates to be charged. The metal grains are discharged fast in the earthing roller and electrostatically attracted with the static charge the electrostatic electrode generates to separate from the separating roller and fall into the metal collecting area, while the negatively charged non-metal grains are repelled electrically by the electrode to maintain on the surface of the metal roller before being brushed with a brush to fall into the non-metal collecting area. Thus, non-metal grains are separated from the metal grains in low cost, high efficiency and no pollution.

Description

technical field [0001] The invention relates to a method for crushing and high-voltage electrostatic separation of waste printed circuit boards, which is a method for recycling, regenerating and recycling waste printed circuit boards. The invention belongs to the field of industrial waste treatment and recycling in the technical field of environmental protection. Background technique [0002] With the rapid development of the electronic information industry, a new type of solid waste, electronic waste, has emerged: including various waste computers, communication equipment, televisions, refrigerators, washing machines, and electronic instruments and meters that have been eliminated by the unit. According to expert estimates, my country currently discards about 28 million refrigerators, washing machines, computers, air conditioners and other electrical appliances every year, and the total amount of discarded electronic appliances reaches 1 million tons, of which printed circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C4/02B02C19/00B02C23/08B03C7/06
Inventor 许振明李佳
Owner SHANGHAI JIAO TONG UNIV
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