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RISS 인기검색어
- 검색키워드
- 저자 : Dinkar Om Shankar (검색결과 3 건)
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Potential hydrometallurgical processes to recycle metals from discarded personal computer
Dinkar Om Shankar,Parween Rukshana,Panda Rekha,Choubey Pankaj Kumar,Ambade Balram,Jha Manis Kumar 한국자원공학회 2022 Geosystem engineering Vol.25 No.3
Rapid technological modernization has accelerated the replacement of older electronic goods with newer ones, which has led to the generation of huge quantities of discarded electronic items at its end-of-life, known as electronic wastes (e-wastes). The growing quantity of e-wastes has become a major threat to the society as well as environment. On the other hand, e-wastes contain several valuable metals and materials of high economic value, which compels researchers to work in the area for secondary resources for metal recovery. Metal recovery from such secondary resources will not only preserve the primary resources but also reduce the loss of valuable metals/materials, protect the environment from their hazardous effects as well as reduce the demand-supply gap of metals up to some extent. In view of the above, present study is focused on the possible effort to figure out variety of metals present in the component of waste personal computers (WPCs) as well as different recycling processes implemented for the efficient recovery of metals.
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Rekha Panda,Om Shankar Dinkar,Archana Kumari,Rajesh Gupta,Manis Kumar Jha,Devendra Deo Pathak 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-
Present research reports a novel and feasible process to recover Ag and generate concentrate of preciousmetals (Au, Pd and Pt) from waste ICs present in PCBs of computers. Initially, depopulated ICs werepulverized and beneficiated to obtain metallic concentrate, which contained (per ton) 7 Kg Ag, 5 Kg Au,110 g Pd and 4 g Pt along with Cu, Pb, Fe and Ni. Leaching was carried out and found that at optimizedcondition i.e. 3 M HNO3, temperature 80 C, pulp density 50 g/L and mixing time 1 h, >90% of Ag, Cu, Pband Ni were leached leaving Au, Pt and Pd in the residue. From the leach liquor, Ag was precipitated using1 M KCl in 30 min and other metals were recovered by precipitation, solvent extraction and cementationmethods. All wastes (solid/ liquid) generated during process development could be treated usingstandard environmental procedure.
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Recycling of gold from waste electronic components of devices
Rekha Panda,Om Shankar Dinkar,Manis Kumar Jha,Devendra Deo Pathak 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.1
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.
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