Study of the use of vertical stirred ball milling as method to enhance the dissolution of copper from chalcopyrite

Giuseppe Granata, M. Minagawa, Tatsuya Kato, Chiharu Tokoro

    研究成果: Conference contribution


    In this work, we studied the mechanochemical activation of chalcopyrite by vertically stirred ball milling (VSBM) to enhance the dissolution of copper. By using x-ray diffraction (XRD) and laser diffraction particle size analysis, we investigated the effect of milling and milling conditions on particle size and phase composition of the chalcopyrite concentrate. To elucidate the efficiency of VSBM towards the mechanochemical activation of chalcopyrite, we also conducted leaching experiments in sulfuric acid-ferric sulfate media. Under all investigated milling conditions, the VSBM determined a dramatic decrease of particle size from over 100 µm of P80% up to about 13 µm. Furthermore, the XRD of the ground chalcopyrite specimens highlighted a partial oxidation of the mineral. In leaching, upon grinding by VSBM, the increase of copper extraction ranged from a minimum of +10% to a maximum of +40%, depending on the grinding conditions. In order to elucidate whether the dissolution enhancement was a consequence of the decreased particle size or of an induced mechanochemical reaction, we performed leaching experiments on activated and non-activated chalcopyrite sample having the same particle size. In addition, we determined the activation energy of leaching before and after vertically stirred ball milling. The leaching results on samples with the same particle size highlighted a greater copper extraction and higher dissolution rates upon mechanochemical activation. Whether performing grinding by VSBM or not, the leaching kinetics was found to be controlled by the chemical reaction on the surface of the chalcopyrite particle. By grinding the chalcopyrite concentrate by VSBM, the activation energy of leaching slightly decreased from 66 to 58 kJ/mol.

    ホスト出版物のタイトルIMPC 2018 - 29th International Mineral Processing Congress
    出版社Canadian Institute of Mining, Metallurgy and Petroleum
    出版ステータスPublished - 2019 1月 1
    イベント29th International Mineral Processing Congress, IMPC 2018 - Moscow, Russian Federation
    継続期間: 2018 9月 172018 9月 21


    Other29th International Mineral Processing Congress, IMPC 2018
    国/地域Russian Federation

    ASJC Scopus subject areas

    • 機械工学
    • 地表過程
    • 地球化学および岩石学
    • 地盤工学および土木地質学


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