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Multiple-roller type high-pressure electrostatic separation method for recovering waste and old printed circuit boards

A printed circuit board and high-voltage electrostatic technology, which is applied in the field of multi-roller high-voltage electrostatic separation, can solve the problems of increasing the processing capacity and the stability of the roller sorter, and achieves improved processing efficiency, stable processing process, and high recovery rate Effect

Inactive Publication Date: 2009-04-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in this technology and method, for example: the separation process cannot avoid the generation of intermediate products, which have high metal content and need further treatment; the purity of non-metallic products needs to be further improved; roller separation The stability of the machine during the sorting process; how to increase the throughput while ensuring the sorting quality, etc.

Method used

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  • Multiple-roller type high-pressure electrostatic separation method for recovering waste and old printed circuit boards
  • Multiple-roller type high-pressure electrostatic separation method for recovering waste and old printed circuit boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Minimize intermediate products

[0026] The broken waste circuit board particles with a particle size of 0.3-0.45mm were used as samples. Two roller separation devices with the same structure are arranged in an array in the vertical direction to form a double roller separation device, and two slides with adjustable angles are arranged between the roller separation devices.

[0027] During separation, the metal-nonmetal mixed particles of the broken waste circuit board enter the first-stage separation device from the feeding trough through the electromagnetic vibrating feeder, and are evenly spread on the surface of the grounding roller, and the roller speed is N 1 It is 60rpm, and then enters the high-voltage electrostatic field formed by corona electrodes, static electrodes and roller electrodes, where the parameters are: voltage U 1 20kV, the distance between the corona electrode and the roller s 1 70mm, the angle α with the vertical center line of the roller 1 25°...

Embodiment 2

[0030] Maximize metal production

[0031] The broken waste circuit board particles with a particle size of 0.3-0.45mm were used as samples. A double-roller separation device is adopted. When separating, the mixed particles enter the first-stage separation device through the electromagnetic vibrating feeder, and are evenly spread on the surface of the ground roller (speed N 1 is 90rpm), and then enters the corona electrode (voltage U 1 30kV, spacing s 1 is 60mm, the included angle α 1 The ionization region formed by 30°). In this region, metallic particles are charged differently from non-metallic particles. The former is at the high voltage static electrode (voltage U 1 30kV, spacing s 2 is 90mm, angle α 2 65°) produces an electrostatic attraction, causing it to detach from the surface of the roller and fall into the metal collection area. The latter is close to the surface of the roller due to the effect of the image force, and moves with the roller until it is brush...

Embodiment 3

[0034] Maximize throughput

[0035] The broken waste circuit board particles with a particle size of 0.3-0.45mm were used as samples. A double-roller separation device is adopted. When separating, the mixed particles enter the first-stage separation device through the electromagnetic vibrating feeder, and are evenly spread on the surface of the ground roller (speed N 1 is 80rpm), and then entered by the corona electrode (voltage U 1 25kV, spacing s 1 is 60mm, the included angle α 1 The ionization region formed by 28°). In this region, metallic particles are charged differently from non-metallic particles. The former is at the high voltage static electrode (voltage U 1 25kV, spacing s 2 is 80mm, the included angle α 2 Under the action of 72°), an electrostatic attraction is generated, causing it to detach from the surface of the roller and fall into the metal collection area. The latter is close to the surface of the roller due to the effect of the image force, and mov...

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Abstract

The invention relates to a method in multi-roll type high-voltage electrostatic separation for recycling a worn-out printed circuit board, which belongs to the technical field of environmental protection. The method comprises the following steps: at least two roll type separation devices with the same structure are arranged in the vertical direction to form an array; materials are fed into a primary separation device to carry out primary separation; an intermediate product and the like which are generated after separation are collected and transported to a secondary separation device to carry out secondary separation; and then products can enter a tertiary separation device, a quaternary separation device and the like in sequence according to requirement, until the recycling of the worn-out printed circuit board is completed. The problems of intermediate products, stability and treatment capacity can be solved by multistep separation, so as to realize optimization to electrostatic separation. Compared with the prior roll type high-voltage electrostatic separator, the method has higher recovery ratio of metal and non metal and more stable processing process, and greatly improves the processing efficiency.

Description

technical field [0001] The invention relates to a multi-roller high-voltage electrostatic separation method for recycling waste printed circuit boards, belonging to the technical field of environmental protection. Background technique [0002] Since the 1990s, under the support of the rapid development of the electronic information industry with electronic computers as the core and microelectronic technology as the basis, the entire electronic industry has also advanced by leaps and bounds. With the continuous advancement of science and technology and the continuous increase of market demand, the updating speed of electronic products and equipment is also accelerating. In the United States, 3.15 million personal computers were scrapped in 2004; the generation of electronic waste in Europe is growing at a rate of 3%-5% per year. This has resulted in the generation of a large amount of electronic waste. As the basis of the electronics industry, printed circuit boards (PCBs) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C7/06
Inventor 许振明吴江
Owner SHANGHAI JIAO TONG UNIV
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