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NOBLE METALS AND ALLOYS
ArticleName Thiocarbamoyl derivatives of polyallylamine for gold and silver recovery from ammonia-thiosulfate leachates
DOI 10.17580/nfm.2018.01.03
ArticleAuthor Privar Y. O., Pestov A. V., Azarova Y. A., Bratskaya S. Y.
ArticleAuthorData

Institute of Chemistry, Far East Branch of Russian Academy of Sciences, Vladivostok, Russia:

Y. O. Privar, Leading Engineer-technologist
Y. A. Azarova, Researcher
S. Y. Bratskaya, Head of Laboratory, Corresponding member of Russian Academy of Sciences, e-mail: sbratska@ich.dvo.ru


I. Ya. Postovsky Institute of Organic Synthesis, Ural Branch of RAS Yekaterinburg, Russia:

A. V. Pestov, Senior researcher

 

Ivannikov S. I., Shamrai E. I., Polyakova N. V., Malakhova I. A., Yudakov A. A. (Institute of Chemistry FEBRAS) have also contributed to this work.

Abstract

Growing concern about ecological safety promotes the interest to cyanide-free leaching of gold-bearing ores and wastes, particularly to ammonia-thiosulfate leaching. In contrast to toxic cyanides, thiosulfates are applicable in underground and heap leaching, less expensive and more efficient for carbonaceous ores. However, traditional technologies of gold recovery from cyanide leachates are not feasible in case of ammonia-thiosulfate solutions, thus, the search for economically sound alternatives is urgent. Here we report on simple and “green” synthesis of new thiocarbamoyl derivatives of polyallylamine (TCPAA) in ammonium thiocyanate/thiourea eutectic melt yielding products with substitution degree (DS) up to 0.87. The TCPAAs obtained have the sorption capacities above 2.5 mmol/g for gold and silver ions in ammonia-thiosulfate solutions, and provide 95 % efficacy of gold and silver recovery from model solutions containing 40 mg/L of precious metals at least in three consecutive sorption cycles (without regeneration). Comparison of TCPAAs efficiency with that of strong base macroporous resin Lewatit MP 500 showed advantages of TCPAA, particularly for silver recovery. Derivatives with DS 0.5 and 0.8 did not show significant advantages over lower substituted TCPAA with DS 0.3 in terms of gold and silver recovery, however, efficacy of gold elution with H2SO4/thiourea solutions was significantly higher for TCPAA with DS 0.5. The potential of TCPAAs for gold and silver recovery from ammonia-thiosulfate leachates has been corroborated using gold-bearing industrial wastes. 86% of gold was eluted from TCPAA of medium DS using 0.5M H2SO4/1M thiourea solution.

Synthesis, characterization of thiocarbamoyl derivatives of polyallylamine, and study of their sorption properties in model solutions were performed with financial support from Russian Foundation of Basic Research (project 18-33-00620 mol_а); investigations of ammonia-thiosulfate leaching of gold-bearing wastes was financially supported by the FEBRAS Program for Basic Research “Far East” (project 18-3-029).

keywords Gold, wastes, ammonia-thiosufate leaching, sorption, polyallylamine, thicarbamoylation, S-containing sorbents
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