【公開日：2023.08.01】【最終更新日：2023.05.02】
課題データ / Project Data
課題番号 / Project Issue Number
22KU1020
利用課題名 / Title
浮選を利用した二次銅・砒素鉱物の分離法の開発
利用した実施機関 / Support Institute
九州大学
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）物質・材料合成プロセス/Molecule & Material Synthesis（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）次世代ナノスケールマテリアル/Next-generation nanoscale materials（副 / Sub）革新的なエネルギー変換を可能とするマテリアル/Materials enabling innovative energy conversion
キーワード / Keywords
電子分光
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
Suyantara Gde Pandhe Wisnu
所属名 / Affiliation
九州大学大学院工学研究院地球資源システム工学部門
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
Enargite is typically associated with chalcocite. Owing to the similarity in the flotation behaviors of these minerals, both minerals are reported to concentrate in the conventional flotation circuit. However, inorganic arsenic in enargite can decrease the copper concentrate quality and increase the operating cost of processing this concentrate. Separating these minerals is important for cleaner copper production to avoid these effects. In this context, this study investigated the effect of hydrogen peroxide (H2O2) treatment on the flotation behavior of chalcocite and enargite. 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.
実験 / Experimental
Flotation tests were performed using pure and mixed mineral of chalcocite and enargite. The minerals were treated with potassium amyl xanthate to improve the floatability. Afterward, the oxidation treatment was conducted using hydrogen peroxide. To investigate the effect of oxidation treatment, surface characterizations were performed using X-ray photoelectron spectroscopy, infra-red spectroscopy, UV-vis spectroscopy, and Zeta potential measurements.
結果と考察 / Results and Discussion
This study presents the effect of H2O2 on the floatability of chalcocite and enargite. The conclusions drawn from this study are as follows:(1)The H2O2 oxidation treatment reduced the floatability of pure chalcocite and enargite with and without KAX at pH 9.(2)The formation of Cu(II) (i.e., Cu(OH)2) and sulfate species on the surfaces of chalcocite and enargite is the key reason for the depressing effect of H2O2 oxidation. In addition, the H2O2 treatment produced arsenic oxides (i.e., As2O3 and As2O5) on the surface of enargite.(3)The selective flotation of enargite and chalcocite is possible after adding a low concentration of H2O2 in the presence of KAX. Under these conditions, enargite floated, and chalcocite was depressed.(4)The flotation results for the pure and mixed minerals indicate a narrow window for separating chalcocite and enargite using a low concentration of H2O2 in a KAX aqueous solution. Under these conditions, enargite was recovered, whereas the chalcocite recovery was depressed. In this study, the best separation efficiency of 50% was achieved by adding 1 mM H2O2 to the 2 µM KAX aqueous solution.(5)The KAX adsorption study, FTIR analysis, and XPS analysis results suggest that the separation of chalcocite and enargite has the following mechanism:(a)KAX rapidly adsorbed on the surface of enargite, and this adsorption was faster than that of KAX on chalcocite.(b)(AX)2 adsorbed on the surface of enargite, in addition to CuAX.(c)The proportions of adsorbed KAX (i.e., CuAX and (AX)2), polysulfide, and oxidized species (i.e., Cu(II) and sulfate species) on the surfaces of chalcocite and enargite, and the distributions of these species may explain the selective flotation behavior.
図・表・数式 / Figures, Tables and Equations
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
This work was supported by Sumitomo Metal Mining Co., Ltd., Japan International Cooperation Agency (JICA), and a Grant-in-Aid for Science Research (JSPS KAKENHI) from the Japan Society for the Promotion of Science (JSPS) (Nos. JP22K14636, JP22H00310 and JP19H02659). This work was partly supported by Advanced Research Infrastructure for Materials and Nanotechnology (No. JPMXP1222KU1009) in Japan sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
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Gde Pandhe Wisnu Suyantara, Effect of hydrogen peroxide on selective flotation of chalcocite and enargite, International Journal of Mining Science and Technology, 33, 703-716(2023).
DOI: https://doi.org/10.1016/j.ijmst.2023.01.002
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件