Crystal formation and growth by slow cooling for recovery of magnetite particles from copper smelting slag

Yuki Tsunazawa, Changzhi Liu, Ryutaro Toi, Takahiko Okura, Chiharu Tokoro

    Research output: Contribution to journalArticle

    Abstract

    Copper smelting produces large amounts of slag and new methods of handling this by-product are required. Considering copper smelting slag as metal resource, we studied the effects of a slow cooling process on the crystal growth of magnetite in smelting slag and the applicability of magnetic separation techniques. As the cooling rate was lowered, the weight fraction of magnetite increased together with the average magnetite grain size. Furthermore, slow cooling in an oxidising atmosphere and temperature holding during the slow cooling process promoted magnetite crystal growth. Magnetic separation tests showed that high separation efficiency was possible when the slow cooled slag was ground to a particle size of ≤20 μm owing to the high magnetite liberation ratio. Consequently, slow cooling was shown to effectively promote crystal growth of magnetite and improve magnetic recovery of magnetite. Abbreviations: EDS: Energy dispersive X-ray spectrometer; MLA: Mineral Liberation Analyzer; SEM: Scanning electron microscope; XRD: X-ray diffraction.

    Fingerprint

    Copper smelting
    Ferrosoferric Oxide
    Magnetite
    smelting
    slag
    Slags
    magnetite
    crystal
    copper
    Cooling
    cooling
    Recovery
    Crystals
    Crystallization
    Crystal growth
    Magnetic separation
    X-ray diffraction
    X ray spectrometers
    Smelting
    particle

    Keywords

    • Copper smelting slag
    • crystal growth
    • magnetic separation
    • magnetite
    • slow cooling

    ASJC Scopus subject areas

    • Chemistry(all)
    • Geochemistry and Petrology
    • Geotechnical Engineering and Engineering Geology

    Cite this

    @article{9096fcb884334339a2db52ef0f836dfb,
    title = "Crystal formation and growth by slow cooling for recovery of magnetite particles from copper smelting slag",
    abstract = "Copper smelting produces large amounts of slag and new methods of handling this by-product are required. Considering copper smelting slag as metal resource, we studied the effects of a slow cooling process on the crystal growth of magnetite in smelting slag and the applicability of magnetic separation techniques. As the cooling rate was lowered, the weight fraction of magnetite increased together with the average magnetite grain size. Furthermore, slow cooling in an oxidising atmosphere and temperature holding during the slow cooling process promoted magnetite crystal growth. Magnetic separation tests showed that high separation efficiency was possible when the slow cooled slag was ground to a particle size of ≤20 μm owing to the high magnetite liberation ratio. Consequently, slow cooling was shown to effectively promote crystal growth of magnetite and improve magnetic recovery of magnetite. Abbreviations: EDS: Energy dispersive X-ray spectrometer; MLA: Mineral Liberation Analyzer; SEM: Scanning electron microscope; XRD: X-ray diffraction.",
    keywords = "Copper smelting slag, crystal growth, magnetic separation, magnetite, slow cooling",
    author = "Yuki Tsunazawa and Changzhi Liu and Ryutaro Toi and Takahiko Okura and Chiharu Tokoro",
    year = "2018",
    month = "1",
    day = "1",
    doi = "10.1080/25726641.2018.1483793",
    language = "English",
    journal = "Mineral Processing and Extractive Metallurgy: Transactions of the Institute of Mining and Metallurgy",
    issn = "2572-6641",
    publisher = "Taylor and Francis Ltd.",

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    TY - JOUR

    T1 - Crystal formation and growth by slow cooling for recovery of magnetite particles from copper smelting slag

    AU - Tsunazawa, Yuki

    AU - Liu, Changzhi

    AU - Toi, Ryutaro

    AU - Okura, Takahiko

    AU - Tokoro, Chiharu

    PY - 2018/1/1

    Y1 - 2018/1/1

    N2 - Copper smelting produces large amounts of slag and new methods of handling this by-product are required. Considering copper smelting slag as metal resource, we studied the effects of a slow cooling process on the crystal growth of magnetite in smelting slag and the applicability of magnetic separation techniques. As the cooling rate was lowered, the weight fraction of magnetite increased together with the average magnetite grain size. Furthermore, slow cooling in an oxidising atmosphere and temperature holding during the slow cooling process promoted magnetite crystal growth. Magnetic separation tests showed that high separation efficiency was possible when the slow cooled slag was ground to a particle size of ≤20 μm owing to the high magnetite liberation ratio. Consequently, slow cooling was shown to effectively promote crystal growth of magnetite and improve magnetic recovery of magnetite. Abbreviations: EDS: Energy dispersive X-ray spectrometer; MLA: Mineral Liberation Analyzer; SEM: Scanning electron microscope; XRD: X-ray diffraction.

    AB - Copper smelting produces large amounts of slag and new methods of handling this by-product are required. Considering copper smelting slag as metal resource, we studied the effects of a slow cooling process on the crystal growth of magnetite in smelting slag and the applicability of magnetic separation techniques. As the cooling rate was lowered, the weight fraction of magnetite increased together with the average magnetite grain size. Furthermore, slow cooling in an oxidising atmosphere and temperature holding during the slow cooling process promoted magnetite crystal growth. Magnetic separation tests showed that high separation efficiency was possible when the slow cooled slag was ground to a particle size of ≤20 μm owing to the high magnetite liberation ratio. Consequently, slow cooling was shown to effectively promote crystal growth of magnetite and improve magnetic recovery of magnetite. Abbreviations: EDS: Energy dispersive X-ray spectrometer; MLA: Mineral Liberation Analyzer; SEM: Scanning electron microscope; XRD: X-ray diffraction.

    KW - Copper smelting slag

    KW - crystal growth

    KW - magnetic separation

    KW - magnetite

    KW - slow cooling

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