CSIR Central

Recycling of gold from waste electronic components of devices

IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur


Field	Value

Title	Recycling of gold from waste electronic components of devices

Creator	Panda, Rekha Dinkar, Om Shankar Jha, Manis K Pathak, D D

Subject	Waste Recycling

Description	Tremendous generation of e-waste and its illegal recycling are causing immense threat to environment as well as the loss of precious metals. The present research reports a novel hybrid process for the total recovery of gold from small depopulated components of e-waste. Connectors and integrated circuits (ICs) liberated from printed circuit boards (PCBs) were pulverized and processed for gold leaching using 10 g/L sodium cyanide solution at 40 oC and mixing time 15 min, where more than 95% gold was found to be leached out in single stage. From the obtained leach liquor, gold metal was recovered by charcoal adsorption followed by heat treatment. The raffinate left after adsorption of gold was found to contain ~10mg/L gold, which was also recovered using Amberlite IRA 400Cl at equilibrium pH 9.6 in 30 min maintaining aqueous/resin (A/R) ratio 25 mL/g. The raffinate solution was enriched to 882.41mg/L and the solution was further processed to get metal/salt using cementation/ evaporation. Obtained leached residue is processed for non-ferrous metals recovery and finally disposed-off after treatment and TCLP test. The effluent left after leaching could be easily decomposed and treated in ETP using standard environmental procedure.

Publisher	Springer

Date	2020

Type	Article PeerReviewed

Format	application/pdf

Identifier	http://eprints.nmlindia.org/8072/1/Panda_(2020)_KJCE.pdf Panda, Rekha and Dinkar, Om Shankar and Jha, Manis K and Pathak, D D (2020) Recycling of gold from waste electronic components of devices. Korean journal of Chemical Engineering, 37(1) (IF-2.476). pp. 111-119.

Relation	http://10.1007/s11814-019-0412-x http://eprints.nmlindia.org/8072/