A new method for the recovery of preciousmetals, in particular gold, from electronic waste is proposed.This work focused on the research of an easilyrenewable etching agent, in order to make an environmentallyfriendly process possible. Two well knownhydrometallurgical etching agents, FeCl3 and CuCl2, wereevaluated in terms of efficiency and kinetics, testingsolutions with different concentration of etchant andhydrochloric acid. The recovery of spent etching solutionswas evaluated: promising results were found in the case ofCuCl2, which can be completely restored by oxidation ofthe cuprous chloride formed during the etching usingatmospheric oxygen.
A new environmentally friendly process for the recovery of gold from electronic waste / Barbieri, Luisa; Giovanardi, Roberto; Lancellotti, Isabella; Michelazzi, Marco. - In: ENVIRONMENTAL CHEMISTRY LETTERS. - ISSN 1610-3653. - STAMPA. - 8:2(2010), pp. 171-178. [10.1007/s10311-009-0205-2]
A new environmentally friendly process for the recovery of gold from electronic waste
BARBIERI, Luisa;GIOVANARDI, Roberto;LANCELLOTTI, Isabella;MICHELAZZI, Marco
2010
Abstract
A new method for the recovery of preciousmetals, in particular gold, from electronic waste is proposed.This work focused on the research of an easilyrenewable etching agent, in order to make an environmentallyfriendly process possible. Two well knownhydrometallurgical etching agents, FeCl3 and CuCl2, wereevaluated in terms of efficiency and kinetics, testingsolutions with different concentration of etchant andhydrochloric acid. The recovery of spent etching solutionswas evaluated: promising results were found in the case ofCuCl2, which can be completely restored by oxidation ofthe cuprous chloride formed during the etching usingatmospheric oxygen.
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