2022 Fiscal Year Final Research Report
Development of Chalcopyrite leaching process using organic aqua regius
| Project/Area Number |
19H02488
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 26060:Metals production and resources production-related
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| Research Institution | Chiba University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 有機王水 / 湿式製錬 / 黄銅鉱 / ミックスサルファイド / 二相分離 / LCA |
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| Outline of Final Research Achievements |
This study aimed to develop a hydrometallurgical process for copper from chalcopyrite (CuFeS2) using organic aqua regia. In the leaching of chalcopyrite with organic aqua regia, it was shown that the chalcopyrite was dissolved without the formation of passive layer, and the optimum operating conditions were investigated. Among the elements associated with chalcopyrite (copper concentrate), precious metals such as Au are dissolved, but the penalty element, As, and pyrite (FeS2) which has a low economic value, remain as residues.
Furthermore, by applying organic aqua regia to Ni/Co mixed sulfides, it was found that the leaching rate could be greatly increased compared to the conventional aqueous solution system, and Ni from the leaching solution could be separated from Cu by solvent extraction.
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| Free Research Field |
湿式製錬
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は、半世紀にわたり課題となっている、湿式法による黄銅鉱(CuFeS2)からの銅の精錬を、提案者が開発した有機王水を用いる精錬プロセスを適用することで達成することを目的とした。ジメチルスルフォキシド系有機王水を用いた浸出においては、不働態が形成されることなく黄銅鉱が溶解することを発見するとともに、沸点が高い故に常圧において高温を用いれることができるゆえ、浸出速度を格段に速めることができることを見出した。ニッケル・コバルト混合硫化物に関しても、既存の水溶液系での浸出速度よりも大幅に増大できることを示したことは、本分野において大きな成果である。
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