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Method for recycling ultrafine copper powder from waste liquid containing complexing copper

A technology for complexing copper and fine copper powder, which is applied in the field of recycling ultra-fine copper powder, can solve the problems of high price and economic benefits, and achieve the effects of improving thermal conductivity and self-repairing performance, short process flow, and concentrated particle size distribution

Active Publication Date: 2014-01-15
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Simultaneously, though sodium borohydride, ascorbic acid are nontoxic, there is the economic benefit problem that product price is expensive

Method used

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  • Method for recycling ultrafine copper powder from waste liquid containing complexing copper
  • Method for recycling ultrafine copper powder from waste liquid containing complexing copper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]The electroplating wastewater containing complexed copper was obtained from the line factory, and the measured copper content was 80g / L (about 1.25mol / L). Add 2g / L pvp k30 dispersant to the waste liquid, and then add 1mol / L industrial glucose, Add 6.25mol / L NaOH, stir and react at 90°C for 1 hour, add thiourea dioxide 1mol / L after the reaction, stir and react at 75°C for 20 minutes, after the reaction is completed, filter, wash twice with water, and wash twice with ethanol , dried in vacuum to make samples. After the reaction, the copper content was measured to be 0.13g / L, and the copper removal rate reached 99%.

[0032] The XRD pattern is done to the sample, and the copper powder with a purity of more than 99.95% (as figure 1 ), while measuring the particle size with a zeta potential-particle size analyzer, and obtained a particle size of 700nm to 1500nm (such as figure 2 ).

Embodiment 2

[0034] Take the electroplating wastewater containing complexed copper from the circuit factory, and the measured copper content is 77.6g / L. Add 0.6g / L pvp k30 dispersant to the waste liquid, then add 3.125mol / L industrial glucose, add 2.5mol / L L of NaOH, stirred and reacted at a temperature of 70°C for 4 hours, after the reaction, added thiourea dioxide 0.625mol / L, stirred and reacted at a temperature of 80°C for 20 minutes, after the reaction was completed, filtered, washed twice with water, washed twice with ethanol, and dried in vacuum After the reaction, the copper content was measured to be 0.47g / L, and the copper removal rate reached 99%.

Embodiment 3

[0036] Take complexed copper-containing electroplating wastewater from the circuit factory, and the measured copper content is 83.4g / L. Add 2g / L pvpk30 dispersant to the waste liquid, then add 0.625mol / L industrial glucose, and add 10mol / L NaOH. Stir and react at a temperature of 105°C for 0.5h, add thiourea dioxide 3.125mol / L after the reaction, stir and react at a temperature of 50°C for 90 minutes, after the reaction is completed, filter, wash twice with water, wash twice with ethanol, vacuum dry, and react After the measurement, the copper content was 0.61g / L, and the copper removal rate reached 99%.

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Abstract

The invention discloses a method for recycling ultrafine copper powder from waste liquid containing complexing copper, and belongs to the technical field of chemical engineering recycling. According to the technical scheme, the method for recycling the ultrafine copper powder from waste liquid containing the complexing copper comprises the steps of adding a pvp dispersing agent in the waste liquid containing the copper, then adding glucose and NaOH, conducting heating and stirring to conduct a prereduction reaction, after the reaction, adding thiourea dioxide, conducting heating and stirring to conduct a reduction reaction, after the reaction is finished, conducting filtering, conducting washing for two times, conducting ethyl alcohol washing for two times, conducting vacuum drying, and obtaining the ultrafine copper powder. According to the method for recycling the ultrafine copper powder, the copper removal rate is 99%, the granularity of the recycled and obtained ultrafine copper powder can be 700nm-1500nm, the purity of the produced copper powder can be more than 99.95%, and the prepared ultrafine copper powder is applied to a plurality of fields of conducting resin, conductive coatings, conductive composite material raw materials, high-performance catalysts, lubricant additives, nanocrystalline copper, medicines and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical recovery, in particular to a method for recovering ultrafine copper powder from waste liquid containing complexed copper. Background technique [0002] In recent years, with the continuous development of electronics, electroplating, petrochemical and other industries, especially the rapid development of electroplating enterprises in towns and villages, the electroplating pollution problem has become more and more superficial, and electroplating wastewater has become one of the representative industrial wastewater that is difficult to treat. The electroplating wastewater containing complexed copper is mainly produced in various copper plating processes: the wastewater produced by the electroless copper precipitation process mainly contains complexing agent EDTA, sodium tartrate or other complexing agent Cu(II), and the chelation between them Form EDTA complexed copper, tartaric acid complexed copp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 李文聪潘涌璋
Owner JINAN UNIVERSITY
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