【企画講演】環境資源循環のためのハイドロメタラジー［9/14(木) AM 第5会場］

[3501-04-02] Novel approaches for the establishment of sustainable and eco-friendly recovery schemes for precious metals in hydrometallurgy

○Sanghee Jeon¹, Naoki Hiroyoshi², Mayumi Ito², Ilhwan Park², Atsushi Shibayama¹, Kazutoshi Haga¹, Labone Godirilwe¹ (1. Akita University, 2. Hokkaido University)

司会者：沖部 奈緒子（九州大学）

キーワード：Gold, Thiosulfate, Galvanic interaction

In hydrometallurgy, cyanide or halides are the conventional solvents to extract precious metals, but as the importance of the environment is emphasized, eco-friendly solvents have been in the spotlight. Among the alternative solvents, thiosulfate is one of the most attractive and promising solvents due to its non-toxicity, low corrosiveness, and high selectivity for precious metals, but its application on an industrial scale application is still severely limited because of one big drawback, which is; there is no acceptable recovery technique to recover gold-thiosulfate complex from the leachate to date. This study addresses several novel approaches for recovering gold ions from thiosulfate solutions by galvanic interactions of electron donors and/or mediators (e.g., zero-valent aluminum, activated carbon, pyrite, magnetite, and hematite).