![]() ![]() Due to of environmental concerns, cyanide leaching has been banned in many regions at present. However, unluckily, cyanide is highly toxic, and there have been some serious environmental accidents occurring around the world caused by the leakage of cyanide from metallurgical plants. In order to simplify the complex two-stage elution process for loaded resins, the traditional catalysis is suggested to be replaced.Ĭyanidation has been the predominant gold leaching technique since it was first put forward by John Stewart MacArthur in the 1880s because of its simple process and low cost. ![]() At last, how to reduce the process cost of the resin adsorption technique is discussed. Based on the comparative analysis for five common recovery techniques of rare-noble metals from pregnant leach solution, ion-exchange resin adsorption is considered to be the most appropriate to recover aurothiosulfate 3− because the resin can be employed in the form of resin-in-leach/pulp and, furthermore, is able to be eluted and regenerated simultaneously at ambient temperature. The reason is that it not only reduces thiosulfate consumption observably via decreasing the redox potential of leach solution significantly but also is beneficial to gold recovery mainly owing to eliminating the interference of cuprous thiosulfate 5−. The replacement of cupric-ammonia catalysis with other metals, such as nickel- and cobalt-based catalysts, is proposed. In this review, the four solutions to reduce the consumption of thiosulfate, including the control of reaction conditions, the use of additives, the generation of thiosulfate in situ, and the replacement of traditional cupric-ammonia catalysis, are introduced and evaluated after the presentation of background knowledge about thiosulfate consumption. Please let us know how we can improve this web app.Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold. Related: Molecular weights of amino acids Weights of atoms and isotopes are from NIST article. ![]()
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