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Multistage winnowing-high voltage electrostatic separation method

A high-voltage electrostatic, multi-stage air technology, applied in electrostatic effect separation, chemical instruments and methods, solid separation and other directions, can solve the problems of dust, large output, increase the workload of electrical separators, etc., to solve the problem of low output and improve Yield, solve the effect of low separation efficiency

Inactive Publication Date: 2011-11-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are still some urgent problems to be solved in the high-voltage electrostatic separation: (1) The adsorption and agglomeration of a large number of fine non-metallic particles during the separation, and the non-metallic particles with small particle sizes are seriously affected by factors such as agglomeration and insufficient nuclear power. The stability of the selection process; (2) the content of non-metallic materials in the broken circuit board is 75%, and a large amount of non-metallic materials enter the sorting machine to increase the work load of the electric separator; (3) when the content of non-metallic materials is too high In the case of high pressure, high-voltage electrostatic separation cannot achieve high separation efficiency and large output at the same time; (4) The dust phenomenon is serious during the transportation of materials, which affects the health of workers

Method used

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Examples

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Embodiment

[0015] Take three-stage wind separation-two-stage high-voltage electrostatic separation as an example:

[0016] The mixed material of crushing waste circuit boards is conveyed by wind power, and the whole system is carried out under sealed conditions. The air volume of the multi-stage wind separation system is 3500m 3 / h, the wind pressure is 7000Pa; the voltage of the electric separator is 25000V.

[0017] In this embodiment, after connecting the multi-stage air separators in series, the output end of the multi-stage air separators is connected with the electric separator and the non-metallic collector, and the metal and non-metallic parts of the broken waste circuit boards to be separated are transported by wind force. The granular mixed materials with a size of 1.20mm-0.02mm are subjected to multi-stage wind separation, in which: the mixed metal and non-metallic mixed materials obtained by the first and second air separators are respectively sent to the corresponding elect...

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Abstract

The invention relates to a multistage winnowing-high voltage electrostatic separation method, belonging to the technical field of environment conservation. After multiple stages of winnowers are successively connected in series, the output ends of the multiple stages of winnowers are connected with an electrical separation machine and a non-meal collector; broken waste circuit board metal to be separated and non-metal particle mixed material with the size of 1.20mm-0.02mm are transported by wind power so as to carry out multistage wind winnowing, wherein the mixed metal and non-metal mixed material which are separated by first-stage and second-stage winnowers and the like respectively enter into corresponding electrical separation machines for high voltage electrostatic separation; and the non-metal material obtained by the last-stage or second-stage winnower directly enters into a non-metal collector for collection.

Description

technical field [0001] The invention relates to a method in the technical field of environmental protection, in particular to a multi-stage winnowing-high-voltage electrostatic separation method for crushing metal and non-metal particles of waste circuit boards. Background technique [0002] At present, my country has become a major producer and consumer of home appliances and electronic products. With the implementation of the policy of "trading the old for the new" of old household appliances, the amount of discarded TV sets, refrigerators, washing machines, air conditioners, and computers will exceed 30 million units per year in 2010. In addition, a large number of mobile phones, copiers, fax machines, printers and other electronic products are scrapped and eliminated every year, and the total amount of waste electronic appliances reaches 3-5 million tons every year. Therefore, the amount of electronic waste processed in my country reaches hundreds of tons every year, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07B9/02B03C7/00
Inventor 许振明余璐璐周蕾李佳侯士兵
Owner SHANGHAI JIAO TONG UNIV
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