Research status and application of low toxicity gold lixiviants
With China's cyanide tailings and cyanide-containing wastewater treatment sludge included in the new edition of the National Hazardous Waste List,gold enterprises are facing huge environmental pressure,so the development of non-toxic or low-toxic gold extraction process has become an urgent need for gold industries.However,due to the high cost of gold extraction,the complicated process of gold recovery from the leaching solution,and the difficulties in the circulation of gold extraction solution,the non-toxic gold lixiviants,such as thiosulfate,thiourea and thiocyanate,have not been widely applied.Compared with sodium cyanide,low-toxic gold lixiviants have unique advantages in toxicity,gold extraction effect and cost,and have a good application prospect.In this paper,the basic properties and characteristics of typical low-toxic gold lixiviants were summarized,and then the synthesis process,synthesis mechanism and leaching mechanism were systematically summarized.Then,the relevant applications of low-toxic gold lixiviants at home and abroad were summarized.Finally,the existing problems of low-toxic gold lixiviants were put forward and the future research focus was prospected.
gold extractioncyanidelow toxicity gold lixiviantssynthesis process and mechanismleaching mechanism
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