Method for recycling metal from waste circuit board

A technology for discarding circuit boards and metals, applied in chemical instruments and methods, wet separation, solid separation, etc., to achieve enhanced effects, eliminate powder agglomeration, and improve recovery rates

Inactive Publication Date: 2016-11-16
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Above prior art all can not

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Accurately weigh the waste circuit board powder with a particle size below 1.0mm and put it into a 1000mL beaker. Based on the waste circuit board powder, add water and sodium dodecylbenzenesulfonate in a weight ratio of 1:50:0.25 , and then stirred for 2 minutes until the agglomerated powder was dispersed, and then the metal and non-metal components in the circuit board powder were separated by a hydraulic shaker to obtain metal-enriched bodies and non-metal-enriched bodies, and then dried to obtain recovered metals.

[0030] Weigh the powder before sorting on a hydraulic shaking table and the metal-enriched body after sorting, digest them with concentrated nitric acid, and then dilute them by a certain number of times. Use an atomic absorption spectrometer to measure the copper content in the two solutions respectively. It can be known by calculation that, The powder with a copper content of 1.8155g can be separated by a hydraulic shaker to obtain a metal-enriched body...

Embodiment 2

[0033] Accurately weigh the waste circuit board powder with a particle size below 0.5mm and put it into a 1000mL beaker. Based on the waste circuit board powder, add water and sodium α-olefin sulfonate in a weight ratio of 1:55:0.30, and then Stir for 5 minutes until the agglomerated powder is dispersed, and then use a hydraulic shaker to separate the metal and non-metal components in the circuit board powder to obtain metal-enriched bodies and non-metal-enriched bodies, and then dry to obtain recovered metals.

[0034] According to the method of Example 1, the content of copper in the original powder and in the separated metal was respectively measured by an atomic absorption spectrometer, and the recovery rate of copper was calculated to be 98.3%.

[0035] It can be seen that the circuit board powder obtained in this example is completely dispersed in water, which provides favorable conditions for hydraulic shaker separation. The recovery rate of the metal is improved (the h...

Embodiment 3

[0037] Accurately weigh the waste circuit board powder with a particle size of 0.15-0.5mm or less and put it into a 1000mL beaker. Based on the waste circuit board powder, add water and sodium secondary alkylsulfonate in a weight ratio of 1:60:0.35 , and then stirred for 8 minutes until the agglomerated powder was dispersed, and then the metal and non-metal components in the circuit board powder were separated by a hydraulic shaker to obtain metal-enriched bodies and non-metal-enriched bodies, and then dried to obtain recovered metals.

[0038] According to the method of Example 1, the content of copper in the original powder and in the metal after separation was measured by atomic absorption spectrometer, and the recovery rate of copper was calculated to be 98.5%. It can be seen that the circuit board powder obtained in this example is completely dispersed in water, which provides favorable conditions for hydraulic shaker separation. Improved metal recovery.

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Abstract

The invention discloses a method for recycling metal from a waste circuit board. The method comprises the following steps: mixing waste circuit board powder, water and a sodium salt type dispersant in a weight ratio being 1:50:0.25 to 1:80:0.6, and stirring until agglomerated powder is dispersed; and then, separating metal and nonmetal components in circuit board powder by use of a hydraulic shaking table to obtain metal concentrate and nonmetal concentrate; and finally, drying the metal concentrate and nonmetal concentrate to obtain recycled metal. The method has the characteristics that electrostatic acting force and surface tension of powder are damaged under the action of the sodium salt type dispersant, so that the circuit board powder within a relatively small particle size range is completely dispersed into water, and powder agglomeration is eliminated, and therefore, metal particles and nonmetal particles which are wrapped with each other are separated. Favorable conditions are provided for gravity separation of metal and nonmetal. The dispersant does not belong to a hazardous article, does not have corrosion action on metal and nonmetal on a circuit board, and can be recycled.

Description

technical field [0001] The invention belongs to the field of recycling electronic waste, in particular to a method for recovering metal from waste circuit boards, so as to realize the recycling and reuse of waste circuit boards. Background technique [0002] With the rapid development of the electronic information industry, the performance of electronic products continues to improve, and their update speed is also getting faster and faster. As the lifespan of electronic products is getting shorter and shorter, electronic waste, especially waste printed circuit boards, is also increasing year by year, becoming one of the sources of electronic waste. The rapid development of electronic information technology has produced a large amount of electronic waste. If it is not handled properly, it will cause great harm to the environment. According to relevant data from the United Nations, the world produces up to 50 million tons of electronic waste every year, and the trend is incre...

Claims

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Application Information

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IPC IPC(8): B03B7/00
CPCB03B7/00
Inventor 卢彦越江勇廖安平马齐佳谢清若蓝平
Owner GUANGXI UNIV FOR NATITIES
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