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Process for preparing high-purity ultra-fine copper powder from copper recovery from waste circuit boards based on electrochemical method

A technology of waste circuit boards and electrochemical method, which is applied in the field of copper recovery to prepare high-purity ultra-fine copper powder, can solve the problems of difficulty in screening or transformation of algae and bacteria, long leaching time, and difficult industrial application, etc., to achieve easy industrial production, The effect of low cost and high recovery rate

Active Publication Date: 2017-12-01
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under the condition of low concentration, the biosorbent can selectively adsorb heavy metals in this method, and the pH value and temperature range are wide, and the recovery efficiency of precious metals is high; but this method is difficult to screen or transform suitable algae and bacteria. Large, the leaching time is long during the treatment process, and it is still in the experimental research stage, and it is difficult to realize industrial application

Method used

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  • Process for preparing high-purity ultra-fine copper powder from copper recovery from waste circuit boards based on electrochemical method
  • Process for preparing high-purity ultra-fine copper powder from copper recovery from waste circuit boards based on electrochemical method
  • Process for preparing high-purity ultra-fine copper powder from copper recovery from waste circuit boards based on electrochemical method

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Experimental program
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Effect test

Embodiment 1

[0040] The waste circuit board whose surface components have been removed is used as the anode, the stainless steel mesh is used as the cathode, the electrolyte is a copper sulfate solution with a concentration of 10g / L, the pH is 0.5, 2g / L of SDS is added, the temperature is 40°C, and the current density is 120mA / cm 2 , pulse period 10ms, duty cycle 0.8, react in the electrolytic cell for 10 minutes, take out the cathode, rinse it with distilled water, dry it, scrape off the copper powder, it is pink, the particles are fine, the volume average diameter is 11.2μm, and the purity is 99.85%.

Embodiment 2

[0042] The waste circuit board whose surface components have been removed is used as the anode, and the polished titanium plate is used as the cathode. The electrolyte is a copper sulfate solution with a concentration of 15g / L and a pH of 0.5. Add 4g / L of SDS and 20mL / L of Tween-80. Temperature 40℃, current density 80mA / cm 2 , pulse period 10ms, duty cycle 0.8, react in H-type electrolytic cell for 10 minutes, take out the cathode, rinse with distilled water, dry, scrape off the copper powder, pink, fine particles, volume average diameter of 9.4μm, purity 99.92 %.

Embodiment 3

[0044] The waste circuit board whose surface components have been removed is used as the anode, and the stainless steel plate is used as the cathode. The electrolyte is a copper sulfate solution with a concentration of 10g / L and a pH of 0.5. 40℃, the current density is 80mA / cm 2 , pulse period 10ms, duty ratio 0.8, react in H-type electrolytic cell for 10 minutes, take out cathode, rinse with distilled water, dry, scrape off copper powder, pink, fine particles, volume average diameter 4.7μm, purity 99.92 %.

[0045] The Fourier transform infrared image of the prepared copper powder is as follows Figure 5 Shown: 3451.59cm -1 It is the characteristic peak of hydroxyl, which should be a small amount of water adsorbed in the copper powder and the hydroxyl in the Tween-80 structure; 2923.65cm -1 It is the methyl vibration absorption peak, 2856.1cm -1 It is the absorption peak of methylene symmetrical stretching vibration, 1628 corresponds to the vibration peak of carbonyl in T...

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Abstract

The invention discloses a technique for preparing high-purity superfine copper powder by recovering copper from a waste circuit board based on an electrochemical process. According to the technique, a copper sulfate-sulfuric acid solution is used as electrolyte, the waste circuit board is used as the anode, and an industrial titanium plate / net or a stainless steel plate / net is used as the cathode; electrolytic deposition is conducted through direct currents or pulse currents, and the copper powder is obtained at the cathode. The purity of the prepared copper powder is higher than 99.9%, the average granularity of the prepared copper powder ranges from 0.3 micron to 10 microns, and the prepared copper powder is high in oxidation resistance and can be used in the fields such as electric slurry, catalysts, lubricating agents and micro-electronic products. The technique is low in cost and environmentally friendly, the recovery rate of copper is over 90%, operation can be achieved by means of a mature electrolytic industrial device in the prior art, and industrial production can be achieved easily.

Description

technical field [0001] The invention discloses a process for preparing high-purity ultrafine copper powder by reclaiming copper from recycled waste circuit boards based on an electrochemical method, and belongs to the technical field of recycling valuable metals in electronic products. Background technique [0002] After mankind entered the information age, digital electronic products developed rapidly, and the rate of replacement became faster and faster. Discarded electronic products produced a lot of garbage. As an indispensable part of electronic products, the number of discarded printed circuit boards is also rapidly increase, resulting in serious environmental pollution. There is lead in the solder used to weld electronic components in waste circuit boards, and some components also contain cadmium, mercury, chromium, etc. Improper treatment methods will cause toxic substances in them to enter water sources and soil, pollute the environment, and endanger human health. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/02C25C1/12
CPCY02P10/20
Inventor 邓姝皓张朵朵刘会群马永梅
Owner CENT SOUTH UNIV