Copper recovery from small devices populated on waste printed circuit boards

Kumari, Anjan and Kumari, Archana and Jha, Manis K and Kumar, Vinod and Singh, R P and Yoo, Kyoungkeun (2014) Copper recovery from small devices populated on waste printed circuit boards. Journal of Metallurgy and Materials Science,, 56(1) (NON-SCI). pp. 41-51.

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Present study discusses the recovery of copper (Cu) from discarded small devices depopulated from waste printed circuit boards (WPCBs) and the same get discarded during its manufacturing. Among all small components, semiconductor devices, especially, metal oxide semiconductor field effect transistors (MOSFETs) are in abundant and selected for Cu recovery. MOSFETs were crushed, leached in HNO and 3 the results were validated thermodynamically. Almost 99% Cu was recovered using 3M HNO at 90°C for 30 min maintaining pulp density 10 g/L. Leach liquor generated was 3 mixed with tri-butyl phosphate (TBP) to extract HNO completely, which requires 3 3 stages at O/A ratio 3:1 and mixing time 15 min. Further, air sparging was carried out to remove the Fe content from the solution in order to intensify the efficiency of electrowinning later used to extract pure Cu metal sheet from the solution. The spent electrolyte containing other metals can be stored for further processing or sent to effluent treatment plant.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Waste printed circuit boards, MOSFET, Copper, HNO , Leaching, Solvent 3 extraction, Electro-winning.
Divisions:Material Science and Technology
ID Code:7187
Deposited By:Sahu A K
Deposited On:19 Mar 2015 11:17
Last Modified:19 Mar 2015 11:17
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