Waste printed circuit board wet-type disassembling method

A printed circuit board and printed circuit technology, which is applied in the field of wet dismantling of waste printed circuit boards, can solve the problems of low component integrity, high risk, and low efficiency, and achieve simple final components, high safety, and solution processing simple effect

Inactive Publication Date: 2015-05-20
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, PCB dismantling is mostly carried out after melting in a tin melting furnace to disassemble components. This method has high temperature, low efficiency, high pollution, strong danger, low component integrity rate, and organic gas volatilization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, the PCB was cleaned to remove surface impurities, dried and placed in a pre-configured methanesulfonic acid solution with a concentration of 1.5mol / L, and an appropriate amount of hydrogen peroxide was added to the acidic solution to make the concentration reach 0.8mol / L. Then stir the solution to make it react completely. After the solder on the surface of the PCB is completely dissolved, take out the circuit board and the electronic components at the bottom of the container and rinse them. When the desoldering rate of the solution decreases, add hydrogen peroxide to the solution. Until the solution no longer dissolves the solder, at this time the acid solution is replaced and the metal in the waste acid is electrolytically recovered or used as a plating solution.

Embodiment 2

[0021] First, the PCB was cleaned to remove surface impurities, placed in a pre-configured acid methanesulfonic acid solution with a concentration of 3.5mol / L, and an appropriate amount of hydrogen peroxide was added to the acid solution to make the concentration reach 0.5mol / L, and then Stir the solution to make it react completely. After the solder on the surface of the PCB is completely dissolved, take out the circuit board and the electronic components at the bottom of the container and rinse them. When the desoldering rate of the solution decreases, add hydrogen peroxide to the solution until The solution no longer dissolves the solder, at which point the acid solution is replaced and the metal in the spent acid is electrolytically recovered or used as a plating solution.

Embodiment 3

[0023] First, the PCB was cleaned to remove surface impurities, placed in a pre-configured acid methanesulfonic acid solution with a concentration of 5.0mol / L, and an appropriate amount of hydrogen peroxide was added to the acid solution to make the concentration reach 0.3mol / L, and then Stir the solution to make it react completely. After the solder on the surface of the PCB is completely dissolved, take out the circuit board and the electronic components at the bottom of the container and rinse them. When the desoldering rate of the solution decreases, add hydrogen peroxide to the solution until the solution Solder is no longer dissolved, and the acid solution is replaced at this time and the metal in the spent acid is electrolytically recovered or used as a plating solution.

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PUM

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Abstract

The invention provides a waste printed circuit board wet-type disassembling method. According to the waste printed circuit board wet-type disassembling method, after a waste printed circuit board is soaked into an acid solution with an oxidizing agent, lead-tin solder on the printed circuit board dissolves to promote welding components and parts to drop off, and the method that the welding components and parts disassemble from a printed circuit board substrate and the electronic components and parts are recycled can be achieved. By means of the waste printed circuit board wet-type disassembling method, time for dissolving and welding detachment is short, the welding dissolve is fast, environment protection can be achieved, the safety is high, the pollution is less, the recycled acid solution can be used as electroplate liquid, resource recycling can be conducted on by-products produced after disassembling , and the problems of high energy consumption, high temperature, low processing volume, large pollution, strong dangerousness and serious damaged condition of the components and parts of PCB conventional hot melting dissembling method are effectively solved.

Description

technical field [0001] The invention relates to the technical field of waste recycling, in particular to a wet dismantling method for waste printed circuit boards. Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization, the shortage of resources and environmental pollution have become prominent contradictions in social development. The shortage and waste of resources pollute the environment on which human beings depend. Therefore, the rational use of waste and old materials to regenerate resources has been increasingly mentioned on the agenda of economic development. The renewable resources industry, regarded as "urban minerals", has become the world's fastest growing industry with the largest energy reserves. The construction of a renewable resource recovery system is an important task related to people's livelihood and social harmony. It is of great significance to the development of circular economy and the e...

Claims

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Application Information

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IPC IPC(8): B23K1/018
CPCB23K1/018
Inventor 关杰张晓娇郭耀广袁昊周媛苏瑞景
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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