Journal
JOURNAL OF CLEANER PRODUCTION
Volume 152, Issue -, Pages 1-6Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.03.087
Keywords
Copper; WPCBs; PVP; Slurry electrolysis; Recovery
Categories
Funding
- National Natural Science Foundation of China [21377104]
- Outstanding Young Scientists Support Program of Southwest University of Science and Technology [13zx9110]
- Research Fund for the development and construction Plans of Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education [13zxgk07]
- Postgraduate Innovation Fund Project by Southwest University of Science and Technology [15ycx039]
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Printed circuit board is an essential part of almost all electrical and electronic equipment (EEE). As the rapid increase of waste EEE (WEEE), caused by the shorter and shorter life span and the accelerated innovation of information communication technologies, waste printed circuit boards (WPCBs) is being a hot issue due to its characteristics of resource abundant but hazardous. In this research, the concentrated metal scraps, obtained by WPCBs mechanical separating, were directly recycled to superfine copper powders by slurry electrolysis. And the effect of polyvinyl pyrrolidone (PVP), oleic acid and H2SO4 concentration, current density and electrolysis time on the purity and particle size of copper powders were discussed in detail. Results showed that all these factors could intensively impact the obtained copper particle size, which became finer as the increase of current density and coarser with the extension of time. Copper powder purity first increased and then decreased as the increase of PVP, oleic acid and H2SO4 concentration. The purity of copper can reach to 993% with a particle size of 7.142 mu m under the optimum conditions: 30 g/L CuSO4.5H(2)O, 60 giL, NaCl, 150 g/L H2SO4, 30 g/L PVP, 6 mL/L oleic acid, 80 mA/cm(2) for 4 h. XRD analysis indicated that copper was the main phase; SEM and TEM analysis showed that the obtained copper powders were dendritic single crystal coated by a layer of PVP and oleic acid. Therefore, slurry electrolysis could be a perspective approach for WPCBs recycling. (C) 2017 Elsevier Ltd. All rights reserved.
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