development of novel hydrometallurgical process with micro powder electrode system

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K18923
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 31:Nuclear engineering, earth resources engineering, energy engineering, and related fields
• Research Institution: Kyushu University
• Principal Investigator: Miki Hajime 九州大学, 工学研究院, 准教授 (10706386)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: 超微量粉末電極 / 硫化鉱物反応挙動 / 湿式製錬 / 浮遊選鉱 / 酸化還元反応 / 電位走査 / ストリッピングボルタンメトリ / インピーダンス測定

Outline of Final Research Achievements

In the method of making ultra-small powder electrodes, a quantitative reproducible method was established and improved. Using these methods, we were able to evaluate the flotation method using redox agent for the separation of copper-arsenic minerals, which has been considered difficult so far. In addition, for the separation of copper-arsenic minerals, we also studied a method using magnetic sorting after heating, and evaluated the mineral changes before and after heating. In addition, we examined the promotion of the advancement of copper and arsenic sulfide minerals, which are known as difficult-to-process minerals in hydrometallurgy, and clarified that the leaching rate is greatly accelerated by the formation of pyroxenite, which is more easily leached in the presence of copper ions, in several minerals. These findings have not been reported.

Free Research Field

鉱物処理

Academic Significance and Societal Importance of the Research Achievements

本研究においては、これまで難しいとされてきた超微量粉末電極の定量的な手法を確立し、広く応用が可能となった。応用の範囲としては、浮遊選別における鉱物表面反応、表面の微量な変化が評価できた。また、硫化鉱物の加熱により鉄を含む鉱物が磁鉄鉱などに変化する様子や、微量の鉱物量変化について評価できた。また、難処理鉱として知られてきた黄銅鉱が、銅イオン存在下で浸出されやすい輝銅鉱に変化することについて、本法の応用により、検証できた。また、黄銅鉱以外の、斑銅鉱、硫ヒ銅鉱、ヒ四面銅鉱についても同様の現象がみられることを確認できた。これらのように、本法の有効性は明らかであり、より広く応用できる可能性を示した。