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Method for recycling micro-nano copper powder from waste printed circuit boards

A printed circuit board, micro-nano technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of large particle size and uneven particle size frequency distribution of copper powder, so as to improve electronic conductivity and avoid secondary pollution , The effect of simple recycling process

Active Publication Date: 2017-12-12
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the copper powder obtained by electrolytic deposition has a large particle size, uneven particle size frequency distribution, and most metal products have a dendrite structure.

Method used

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  • Method for recycling micro-nano copper powder from waste printed circuit boards
  • Method for recycling micro-nano copper powder from waste printed circuit boards
  • Method for recycling micro-nano copper powder from waste printed circuit boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, 6 g of metal-enriched body powder with a copper content of 80.34% after mechanical crushing and sorting was weighed and placed in the anode chamber, and a copper plate with a size of 6 cm×7 cm and a ruthenium-coated titanium plate were used as the cathode and anode, respectively; 200 mL electrolyte, the electrolyte composition is CuSO 4 ﹒ 5H 2 O (Cu 2+ 30 g / L) + NaCl (Cl - 60 g / L)+H 2 SO 4 (130 g / L) +PVP (4 g / L); Ozone was introduced into the electrolyte in the anode chamber (connected to the ozone generator, the air intake was 1.5 L / min); the power was turned on, and the current density was set to 80 mA / min. cm 2 , electrolysis 4h. After the electrolysis reaction is completed, the cathode copper plate and the copper powder deposited on the cathode are collected, and the copper powder obtained from the cathode is placed in a benzotriazole solution with a concentration of 5 g / L for passivation for 5 minutes to avoid its oxidation. Rinse three times with...

Embodiment 2

[0029] First, 6 g of metal-enriched body powder with a copper content of 80.34% after mechanical crushing and sorting was weighed and placed in the anode chamber, and a copper plate with a size of 6 cm×7 cm and a ruthenium-coated titanium plate were used as the cathode and anode, respectively; 200 mL electrolyte, the electrolyte composition is CuSO 4 ﹒ 5H 2 O (Cu 2+ 30 g / L) + NaCl (Cl - 60 g / L)+ H 2 SO 4 (130 g / L) +PVP (6 g / L); Ozone was introduced into the electrolyte in the anode chamber (connected to the ozone generator, the intake air volume was 1.5 L / min); the power was turned on, and the current density was set to 80 mA / min. cm 2 , electrolysis 4h. After the electrolysis reaction is completed, the cathode copper plate and the copper powder deposited on the cathode are collected, and the copper powder obtained from the cathode is placed in a benzotriazole solution with a concentration of 5 g / L for passivation for 5 minutes to avoid its oxidation. Rinse three ti...

Embodiment 3

[0032] First, 6 g of metal-enriched body powder with a copper content of 80.34% after mechanical crushing and sorting was weighed and placed in the anode chamber, and a copper plate with a size of 6 cm×7 cm and a ruthenium-coated titanium plate were used as the cathode and anode, respectively; 200 mL electrolyte, the electrolyte composition is CuSO 4 ﹒ 5H 2 O (Cu 2+ 30 g / L) + NaCl (Cl - 60 g / L)+ H 2 SO 4 (130 g / L) +PVP (8 g / L); Ozone was introduced into the electrolyte in the anode chamber (connected to the ozone generator, the intake air volume was 1.5 L / min); the power was turned on, and the current density was set to 80 mA / min. cm 2 , electrolysis 4h. After the electrolysis reaction is completed, the cathode copper plate and the copper powder deposited on the cathode are collected, and the copper powder obtained from the cathode is placed in a benzotriazole solution with a concentration of 5 g / L for passivation for 5 minutes to avoid its oxidation. Rinse three ti...

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Abstract

The invention discloses a method for recycling micro-nano copper powder from waste printed circuit boards. The method comprises the following steps: taking CuSO4.5H2O-NaCl-H2SO4 as an electrolytic system, taking a stabilizer or ionic liquid as an additive, and directly separating metals and nonmetals from the waste printed circuit boards in one step through an electrodynamic method, wherein the separation rate can reach 95.6% or higher; the recycled metal powder is free of nonmetals; the shape, the crystal form and the particle size of the recycled copper powder can be controlled by adjusting the types and the usage amount of the additives; the stabilizer PVP is added; the particle size of the copper powder is less than 100nm; the purity can reach 99% or higher; the ionic liquid [BSO3HMIm]HSO4 is added; the recycled copper powder is of dendritic crystal shape; the added ionic liquid [BSO3HPy]HSO4 is a spheroidal anno Cu / Cu<2+1>O composite material; the prepared copper powder can be used as a lithium-ion battery negative material and has high theoretical capacity and high safety performance; the metal phase Cu mixed in the copper powder particles can also improve the electronic conductivity of the nanoparticles.

Description

technical field [0001] The invention relates to electronic waste resource treatment and valuable metal recovery belonging to the field of environmental protection, and relates to a method for recovering micronano copper powder from waste printed circuit boards. Background technique [0002] Printed circuit boards are the basic components of electronic and electrical products and exist in almost all electronic products. With the acceleration of the upgrading of electronic and electrical products, a large number of waste printed circuit boards (Waste Printed Circuit Boards, WPCBs) are produced. There are many kinds of WPCBs with complex components, generally composed of a mixture of resin, glass fiber, plastic and various metals. On the one hand, WPCBs contain a large number of toxic and harmful chemicals, among which lead is contained in the solder for soldering electronic components, polychlorinated biphenyls and polybrominated diphenyl ethers (PBDE) are contained in the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/02C25C7/02C25C7/06
CPCC25C5/02C25C7/02C25C7/06
Inventor 陈梦君谭秋峡张莎张玉改王蓉
Owner SOUTHWEAT UNIV OF SCI & TECH
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