Multistage winnowing-high voltage electrostatic separation method

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...

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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

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