MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
A Novel Process for the Production of Gold Micrometer-Sized Particles from Secondary Sources
Akihiro YoshimuraYasunari Matsuno
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2016 Volume 57 Issue 3 Pages 357-361

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Abstract

A novel method for the production of gold micrometer-sized particles from secondary sources is presented. The method consists of the leaching of gold using dimethyl sulfoxide (DMSO, (CH3)2SO) solutions containing copper chloride (CuCl2) followed by the precipitation of gold with hydrochloric acid (HCl). Gold was dissolved in a DMSO solution with 0.1–0.2 M CuCl2 and 0–0.3 M sodium chloride (NaCl) at 343 K. The precipitation of dissolved gold was performed by the addition of HCl, during which the effects of the concentration of the Cl ion was investigated. It was found that the initial gold dissolution rate in DMSO solutions with CuCl2 was up to 14.8 mg cm−2 h−1, which was larger than the rates obtained with other leaching methods, but smaller than the author’s previous research using copper bromide (CuBr2) and potassium bromide (KBr). A gold recovery efficiency of up to 92.6% was obtained by precipitation with HCl solution. We obtained “raspberry-like” or “confeito-like” gold microspheres under the condition of less than 1.5 M of Cl ion and over 0.013 M of dissolved gold. Our results demonstrated that a circulating system for gold leaching and recovery and production of functional material could be developed, which would offer a number of advantages, including eco-friendliness, easy operation, low costs, and minimization of chemical sludge production.

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© 2016 The Japan Institute of Metals and Materials
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