The Toyo Smelter and Refinery, owned by Sumitomo Metal Mining Co., Ltd. (SMM) is located in the coastal zone of Saijo City and Niihama City, Ehime Pref. The refinery has been producing copper, sulfuric acid, and precious metals such as gold, silver, and PGMs. Previously, the process of precious metals recoverywas a combinationof pyrometallurgy and an electro-refining process with the conventional cupellation for around400 years. However, this process had some major problems such as non-efficient recovery of valuable metals, high environmentalrisk by pyrometallurgy, high cost for maintenance of equipment and so on. In order to solve these problems, a thorough hydrometallurgical process for precious metals refining using chlorine leaching technology was originated and developed by Sumitomo and thereafter commercialized in 2004 at Toyo Copper Smelter and Refinery. This new process enabled shorter-term recovery of gold and manpower saving, and occupational safety and working conditions have also been improved. Superiority over the existing hydrometallurgical processes was also confirmed, for example by the achievement of 99.99% pure silver production without an electro-refining process. This papersummarizes the hydrometallurgical technologies for precious metalsrecovery such as chlorine leaching of copper anode slime for silver recovery, solvent extraction (SX) for gold recovery, and ion exchange (IX) for PGMs recovery. It also presents a unique silver purification process.
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机译：由Sumitomo Metal Mining Co.，Ltd。（SMM）拥有的丰田冶炼厂和炼油厂位于艾哈德市沿海地区和尼海山城，埃希姆。炼油厂一直生产铜，硫酸和贵金属，如金，银和PGM。此前，贵金属的过程恢复了致火径冶金和电炼过程的组合，具有传统型材约为400年。然而，这一过程具有一些重大问题，如无效的有价值金属，高环保的高效恢复，通过Pyrome冶金，维护设备的高成本等。为了解决这些问题，通过Sumitomo起源于2004年在Toyo Copper冶炼厂和炼油厂的2004年商业化的贵金属炼油方法的彻底液压冶金工艺。这一新流程使黄金和人力节省的较短恢复，职业安全和工作条件也得到了改善。还确认了现有的液压冶金方法的优越性，例如通过在没有电解过程的情况下实现99.99％的纯银生产。本文旨在提高贵金属的液态冶金技术，例如铜阳极粘液的氯浸出，用于银回收，用于金回收的溶剂萃取（SX），以及用于PGM回收的离子交换（IX）。它还呈现出独特的银净化过程。
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