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Low-temperature vacuum themal dissociation waste printed wiring board preprocessing method

A low-temperature vacuum and vacuum pyrolysis technology, used in electronic waste recycling, solid waste removal, recycling technology, etc., can solve the problems of low degree of metal dissociation, equipment wear, secondary pollution, etc., to avoid secondary pollution. The effect of pollution, reducing activation energy and reducing energy consumption

Inactive Publication Date: 2007-02-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since printed circuit boards are composite materials with high toughness, there are still problems in the crushing process of waste printed circuit boards (1) high requirements for crushing equipment and serious equipment wear; (2) unsatisfactory crushing effect (recovery rate, metal The degree of dissociation is not high); (3) high energy consumption, secondary pollution and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Put the waste printed circuit board in the vacuum pyrolysis furnace, start the pyrolysis furnace to heat; start the vacuum pump at the same time, and maintain the vacuum degree of about 100Pa;

[0022] 2. When the temperature in the furnace rises to 275 degrees Celsius, stop heating and keep warm for 10 minutes;

[0023] 3. After the temperature in the furnace cools down to room temperature (about 4 hours later), turn off the vacuum pump, turn on the pyrolysis furnace and take out the waste circuit board.

[0024] 4. Use an angle-cut crusher to crush the pretreated waste printed circuit board samples, using a 2mm screen;

[0025] 5. After crushing, put the crushed product into an electric vibrating sieve machine for screening, and observe the degree of dissociation of the screened product.

[0026] 6. Result: The total metal dissociation degree is 100%

Embodiment 2

[0028] 1. Put the waste printed circuit board in the vacuum pyrolysis furnace, start the pyrolysis furnace to heat; start the vacuum pump at the same time to maintain the vacuum degree below 1000Pa;

[0029] 2. When the temperature in the furnace rises to 250 degrees Celsius, stop heating and keep warm for 20 minutes;

[0030] 3. After the temperature in the furnace cools down to room temperature (about 4 hours later), turn off the vacuum pump, turn on the pyrolysis furnace and take out the waste circuit board.

[0031] 4. Use an angle-cut crusher to crush the pretreated waste printed circuit board samples, using a 2mm screen;

[0032] 5. After crushing, put the crushed product into an electric vibrating sieve machine for screening, and observe the degree of dissociation of the screened product.

[0033] 6. Result: The total metal dissociation degree is 100%

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Abstract

The invention discloses a predisposing method of low-temperature vacuum pyrolytic waste print circuit in the resource recycling technological domain, which comprises the following steps: placing waste print circuit board in the vacuum pyrolytic furnace, starting pyrolytic furnace to heat, starting vacuum pump, maintaining vacuum degree at 30-1000pa, stopping heating after the inner furnace temperature reaches 200-300 deg.c, insulating, cooling, grinding the waste print circuit board, sieving.

Description

technical field [0001] The invention relates to recycling technology of waste printed circuit boards, in particular to a method for pretreating waste printed circuit boards by low-temperature vacuum pyrolysis, which belongs to the technical field of resource recovery. Background technique [0002] Printed circuit boards are an important part of various electronic and electrical products. With the rapid development of electronics and information technology industries, the output of printed circuit boards has also increased rapidly, which has also brought about an increasingly severe problem of waste printed circuit boards. [0003] There are a large number of components that can cause serious harm to the environment in waste circuit boards, such as bromine-containing flame retardants, various heavy metal components, etc., if not properly disposed and treated, it will cause environmental and health damage. However, from the perspective of resource recovery, waste printed circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCY02W30/82
Inventor 李金惠于可利
Owner TSINGHUA UNIV
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