Recovery of Ag, Cu, Ni and Fe from the nitrate leach liquor of waste ICs

Panda, Rekha and Jha, Manis K and Pathak, D D and Gupta, Rajesh (2020) Recovery of Ag, Cu, Ni and Fe from the nitrate leach liquor of waste ICs. Minerals Engineering, 158 (IF-3.795). 106584.

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Novel and simple flow-sheet has been reported to process integrated circuits (ICs) for effective recovery of metals. The depopulated ICs from waste PCBs were pulverised, beneficiated and leached in nitric acid. From the nitrate leach liquor, Fe was removed at pH 3.5, temperature 60 °C and air sparging. Subsequently, 99.99% Ag was precipitated as AgCl using 5% NaCl in mixing time 10 min. Further, 99.99% Cu was extracted from the filtrate using 20% LIX 984 N along with 2% isodecanol (ID) diluted in kerosene at pH 2.97, organic to aqueous phase ratio 1 in 10 min, leaving Ni in the raffinate. From the obtained pure solutions, salts of Cu and Ni could be produced using evaporation technique. The developed hydrometallurgical process flow-sheet to recover valuables from the nitrate leach liquor of waste ICs has the potential to be commercialised after pilot/ scale-up trial validations.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:E-waste; ICs; Leach liquor; Silver; Precipitation
Divisions:Metal Extraction and Forming
ID Code:8220
Deposited By:Dr. A K Sahu
Deposited On:27 Aug 2020 12:07
Last Modified:27 Aug 2020 12:07
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