Enhancement of copper dissolution by mechanochemical activation of copper ores: Correlation between leaching experiments and DEM simulations

Masaya Minagawa, Shosei Hisatomi, Tatsuya Kato, Giuseppe Granata, Chiharu Tokoro

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    In this work we investigated the influence of planetary ball milling and vertical stirred ball milling on the leaching of a copper ore containing copper sulfate and covellite. We used a mixed experimental-simulation approach to correlate the kinetic parameters of leaching to the collision energy during grinding. The effect of milling was studied by scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS). Results showed that both high-intensity grinding techniques resulted into a dramatic decrease of particle size. Furthermore, under specific grinding conditions, the planetary ball milling determined also the partial amorphization of covellite. The collision energies corresponding to specific grinding conditions in terms of rotational speed and number of grinding media were assessed by DEM simulations and were related to the specific surface area after grinding. The specific surface area of grinded samples was found to be directly proportional to the collision energy in grinding. The leaching of the ore occurred through three subsequent steps: (i) dissolution of copper sulfate, (ii) dissolution of amorphousized covellite and (iii) dissolution of residual crystalline covellite. The results of kinetic fitting highlighted an increase of the rate constants for the leaching of amorphous and crystalline covellite by intensifying the milling conditions. By correlating the collision energies from DEM simulation with the leaching rate constants, we confirmed that the rate constants for the leaching of covellite increased due to an occurred mechanochemical reaction. The mechanochemical reaction that determined the partial amorphization of covellite occurred above 0.25 J/s · g. On the other hand, the rate constants for the leaching of the residual crystalline covellite constantly and progressively increased with the collision energy, thus highlighting an improvement of leaching due to an increase of surface area.

    Original languageEnglish
    Pages (from-to)471-478
    Number of pages8
    JournalAdvanced Powder Technology
    Volume29
    Issue number3
    DOIs
    Publication statusPublished - 2018 Mar 1

    Fingerprint

    Ores
    Leaching
    Copper
    Dissolution
    Chemical activation
    Rate constants
    Ball milling
    Experiments
    Copper Sulfate
    Amorphization
    Crystalline materials
    Specific surface area
    Scanning electron microscopy
    cupric sulfide
    X ray absorption
    Kinetic parameters
    Particle size
    X ray diffraction
    Kinetics

    Keywords

    • Copper leaching
    • Discrete element method
    • Mechanochemical reaction

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Mechanics of Materials

    Cite this

    Enhancement of copper dissolution by mechanochemical activation of copper ores : Correlation between leaching experiments and DEM simulations. / Minagawa, Masaya; Hisatomi, Shosei; Kato, Tatsuya; Granata, Giuseppe; Tokoro, Chiharu.

    In: Advanced Powder Technology, Vol. 29, No. 3, 01.03.2018, p. 471-478.

    Research output: Contribution to journalArticle

    @article{f1de9ef7f7ac45f097b0e7df685eac35,
    title = "Enhancement of copper dissolution by mechanochemical activation of copper ores: Correlation between leaching experiments and DEM simulations",
    abstract = "In this work we investigated the influence of planetary ball milling and vertical stirred ball milling on the leaching of a copper ore containing copper sulfate and covellite. We used a mixed experimental-simulation approach to correlate the kinetic parameters of leaching to the collision energy during grinding. The effect of milling was studied by scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS). Results showed that both high-intensity grinding techniques resulted into a dramatic decrease of particle size. Furthermore, under specific grinding conditions, the planetary ball milling determined also the partial amorphization of covellite. The collision energies corresponding to specific grinding conditions in terms of rotational speed and number of grinding media were assessed by DEM simulations and were related to the specific surface area after grinding. The specific surface area of grinded samples was found to be directly proportional to the collision energy in grinding. The leaching of the ore occurred through three subsequent steps: (i) dissolution of copper sulfate, (ii) dissolution of amorphousized covellite and (iii) dissolution of residual crystalline covellite. The results of kinetic fitting highlighted an increase of the rate constants for the leaching of amorphous and crystalline covellite by intensifying the milling conditions. By correlating the collision energies from DEM simulation with the leaching rate constants, we confirmed that the rate constants for the leaching of covellite increased due to an occurred mechanochemical reaction. The mechanochemical reaction that determined the partial amorphization of covellite occurred above 0.25 J/s · g. On the other hand, the rate constants for the leaching of the residual crystalline covellite constantly and progressively increased with the collision energy, thus highlighting an improvement of leaching due to an increase of surface area.",
    keywords = "Copper leaching, Discrete element method, Mechanochemical reaction",
    author = "Masaya Minagawa and Shosei Hisatomi and Tatsuya Kato and Giuseppe Granata and Chiharu Tokoro",
    year = "2018",
    month = "3",
    day = "1",
    doi = "10.1016/j.apt.2017.11.031",
    language = "English",
    volume = "29",
    pages = "471--478",
    journal = "Advanced Powder Technology",
    issn = "0921-8831",
    publisher = "Elsevier BV",
    number = "3",

    }

    TY - JOUR

    T1 - Enhancement of copper dissolution by mechanochemical activation of copper ores

    T2 - Correlation between leaching experiments and DEM simulations

    AU - Minagawa, Masaya

    AU - Hisatomi, Shosei

    AU - Kato, Tatsuya

    AU - Granata, Giuseppe

    AU - Tokoro, Chiharu

    PY - 2018/3/1

    Y1 - 2018/3/1

    N2 - In this work we investigated the influence of planetary ball milling and vertical stirred ball milling on the leaching of a copper ore containing copper sulfate and covellite. We used a mixed experimental-simulation approach to correlate the kinetic parameters of leaching to the collision energy during grinding. The effect of milling was studied by scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS). Results showed that both high-intensity grinding techniques resulted into a dramatic decrease of particle size. Furthermore, under specific grinding conditions, the planetary ball milling determined also the partial amorphization of covellite. The collision energies corresponding to specific grinding conditions in terms of rotational speed and number of grinding media were assessed by DEM simulations and were related to the specific surface area after grinding. The specific surface area of grinded samples was found to be directly proportional to the collision energy in grinding. The leaching of the ore occurred through three subsequent steps: (i) dissolution of copper sulfate, (ii) dissolution of amorphousized covellite and (iii) dissolution of residual crystalline covellite. The results of kinetic fitting highlighted an increase of the rate constants for the leaching of amorphous and crystalline covellite by intensifying the milling conditions. By correlating the collision energies from DEM simulation with the leaching rate constants, we confirmed that the rate constants for the leaching of covellite increased due to an occurred mechanochemical reaction. The mechanochemical reaction that determined the partial amorphization of covellite occurred above 0.25 J/s · g. On the other hand, the rate constants for the leaching of the residual crystalline covellite constantly and progressively increased with the collision energy, thus highlighting an improvement of leaching due to an increase of surface area.

    AB - In this work we investigated the influence of planetary ball milling and vertical stirred ball milling on the leaching of a copper ore containing copper sulfate and covellite. We used a mixed experimental-simulation approach to correlate the kinetic parameters of leaching to the collision energy during grinding. The effect of milling was studied by scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS). Results showed that both high-intensity grinding techniques resulted into a dramatic decrease of particle size. Furthermore, under specific grinding conditions, the planetary ball milling determined also the partial amorphization of covellite. The collision energies corresponding to specific grinding conditions in terms of rotational speed and number of grinding media were assessed by DEM simulations and were related to the specific surface area after grinding. The specific surface area of grinded samples was found to be directly proportional to the collision energy in grinding. The leaching of the ore occurred through three subsequent steps: (i) dissolution of copper sulfate, (ii) dissolution of amorphousized covellite and (iii) dissolution of residual crystalline covellite. The results of kinetic fitting highlighted an increase of the rate constants for the leaching of amorphous and crystalline covellite by intensifying the milling conditions. By correlating the collision energies from DEM simulation with the leaching rate constants, we confirmed that the rate constants for the leaching of covellite increased due to an occurred mechanochemical reaction. The mechanochemical reaction that determined the partial amorphization of covellite occurred above 0.25 J/s · g. On the other hand, the rate constants for the leaching of the residual crystalline covellite constantly and progressively increased with the collision energy, thus highlighting an improvement of leaching due to an increase of surface area.

    KW - Copper leaching

    KW - Discrete element method

    KW - Mechanochemical reaction

    UR - http://www.scopus.com/inward/record.url?scp=85039431624&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85039431624&partnerID=8YFLogxK

    U2 - 10.1016/j.apt.2017.11.031

    DO - 10.1016/j.apt.2017.11.031

    M3 - Article

    AN - SCOPUS:85039431624

    VL - 29

    SP - 471

    EP - 478

    JO - Advanced Powder Technology

    JF - Advanced Powder Technology

    SN - 0921-8831

    IS - 3

    ER -