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Indian Institute of Technology (IIT) Patna 
Verma, A. and S. Hait,  
Corresponding Authors:
S. Hait 
DOI #: 
Chelating extraction of metals from e-waste using diethylenetriamine pentaacetic acid,  
Process Safety and Environmental Protection  
E-waste, Printed circuit board, Metals, Chemical leaching, Chelation, DTPA 
In this study, the chelating extraction of base metals namely, Cu, Zn, Ni from printed circuit board (PCB)of obsolete computer was carried out using diethylene triamine pentaacetic acid (DTPA) as a safer ligand.At a liquid to solid ratio (L/S ratio) of 50 and the comminuted PCB in the size range of 0.038–1 mm,the maximum extraction of around 97% Cu at 4.5 d and more than 99% each of Zn and Ni at 3 d wasachieved using 0.5 M DTPA at pH of 9, temperature of 50◦C and mixing speed of 450 rpm. Using 0.9 MH2O2under optimized process conditions, around 99% Cu and 82% Ni leaching were achieved in 8 halong with complete leaching of Zn in 1 h only. Kinetics development using the shrinking core model(SCM) indicated that the metal extraction from the PCB comminution fines using DTPA is controlled bydiffusion process. Further, metal recovery of around 98% each for Cu and Ni and 95% for Zn was achievedby the chemical precipitation of the leachate. Chelating extraction using DTPA coupled with the chemicalprecipitation of the leachate has the potential to emerge as a complete solution for metal recycling frome-waste. 
Entered by:
Venkata Dantham on 2020-08-03 
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