| 研究課題/領域番号 |
22K14636
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| 研究機関 | 九州大学 |
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研究代表者 |
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| 研究期間 (年度) |
2022-04-01 – 2024-03-31
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| キーワード | enargite / chalcocite / hydrogen peroxide / potassium amyl xanthate / selective flotation / mineral separation |
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| 研究実績の概要 |
The separation of chalcocite (a secondary copper mineral) and enargite (a copper arsenic mineral) was studied using hydrogen peroxide (H2O2) oxidation treatment and flotation process. Flotation tests of pure and mixed minerals indicated that H2O2 treatment reduced the floatability of chalcocite and enargite by forming sulfate and copper hydroxide on their surfaces. Despite the detrimental effect of the H2O2 treatment, there was a narrow window of H2O2 concentration for separating both minerals, in which enargite floated and chalcocite was depressed. This selective flotation behavior was caused by the rapid adsorption of potassium amyl xanthate (KAX) and lower surface oxidation of enargite compared with that of chalcocite.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The research was going smoothly, as planned. Although it is initially difficult to separate both chalcocite and enargite owing to their similarity and interactions, we optimize the separation process using various hydrogen peroxide concentrations. Unfortunately, we have yet to apply this process to covellite and tennantite, owing to difficulties obtaining high-quality covellite and tennantite.
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| 今後の研究の推進方策 |
We planned to obtain a high-quality covellite and tenanntite and then applied the similar oxidation treatment to evaluate the selective separation possibility. In addition, we are going to investigate other treatments for selective separation of chalcocite and enargite using flotation. Furthermore, we will try to apply this oxidation treatment with complex copper ores.
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| 次年度使用額が生じた理由 |
We plan to purchase high-quality covellite, tennantite, and other minerals for further research in the next fiscal year. We plan to buy a flotation machine and supporting equipment (i.e., nanobubble generator, glass column) for processing complex copper ores. These additional equipment and mineral samples will increase the number of experiments in the next fiscal year. Therefore, we estimate the sample analysis cost will also significantly increase. Furthermore, now that the pandemic is under control, we can attend the conference onsite, improving domestic and international mobility.
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