Boron extraction with 2-ethyl-1,3-hexanediol using a microchannel device for high-purity source of solar-grade silicon

Nobufumi Matsuo, Yuki Matsui, Yasuhiro Fukunaka, Takayuki Homma

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    A novel approach toward the purification of silica and removal of boron impurities via solvent extraction with 2-ethyl-1,3-hexanediol using a microchannel device is presented. The microchannel, fabricated on Si substrates using lithographic techniques, had 100 μm width, 100 μm depth, and 10 mm length. Amorphous silica spiked with a trace amount of boric acid and refined diatomaceous earth used as silica feedstock were purified. Residual boron content was determined by inductively coupled argon plasma atomic emission spectrometry. Following extraction using a microchannel device, the residual boron content was less than 1.0 ppm for the former silica feedstock and than 2.5 ppm for the latter one, and the contact reaction period was 0.03 seconds for both type of silica feedstock. These are lower and significantly shorter due to much shorter diffusion distance and much larger specific interfacial area as compared to those observed when using a conventional separatory funnel, for both types of silica feedstock. Hence, it is suggested that microchannel devices can be utilized as an attractive approach toward the production of high-purity silica as a source for solar-grade silicon.

    Original languageEnglish
    JournalJournal of the Electrochemical Society
    Volume161
    Issue number5
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    Boron
    Silicon
    microchannels
    Microchannels
    Silicon Dioxide
    grade
    purity
    boron
    Silica
    silicon dioxide
    silicon
    Feedstocks
    Diatomaceous Earth
    boric acids
    solvent extraction
    Boric acid
    funnels
    Argon
    argon plasma
    Solvent extraction

    ASJC Scopus subject areas

    • Electrochemistry
    • Electronic, Optical and Magnetic Materials
    • Materials Chemistry
    • Surfaces, Coatings and Films
    • Renewable Energy, Sustainability and the Environment
    • Condensed Matter Physics

    Cite this

    Boron extraction with 2-ethyl-1,3-hexanediol using a microchannel device for high-purity source of solar-grade silicon. / Matsuo, Nobufumi; Matsui, Yuki; Fukunaka, Yasuhiro; Homma, Takayuki.

    In: Journal of the Electrochemical Society, Vol. 161, No. 5, 2014.

    Research output: Contribution to journalArticle

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    AU - Matsui, Yuki

    AU - Fukunaka, Yasuhiro

    AU - Homma, Takayuki

    PY - 2014

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    N2 - A novel approach toward the purification of silica and removal of boron impurities via solvent extraction with 2-ethyl-1,3-hexanediol using a microchannel device is presented. The microchannel, fabricated on Si substrates using lithographic techniques, had 100 μm width, 100 μm depth, and 10 mm length. Amorphous silica spiked with a trace amount of boric acid and refined diatomaceous earth used as silica feedstock were purified. Residual boron content was determined by inductively coupled argon plasma atomic emission spectrometry. Following extraction using a microchannel device, the residual boron content was less than 1.0 ppm for the former silica feedstock and than 2.5 ppm for the latter one, and the contact reaction period was 0.03 seconds for both type of silica feedstock. These are lower and significantly shorter due to much shorter diffusion distance and much larger specific interfacial area as compared to those observed when using a conventional separatory funnel, for both types of silica feedstock. Hence, it is suggested that microchannel devices can be utilized as an attractive approach toward the production of high-purity silica as a source for solar-grade silicon.

    AB - A novel approach toward the purification of silica and removal of boron impurities via solvent extraction with 2-ethyl-1,3-hexanediol using a microchannel device is presented. The microchannel, fabricated on Si substrates using lithographic techniques, had 100 μm width, 100 μm depth, and 10 mm length. Amorphous silica spiked with a trace amount of boric acid and refined diatomaceous earth used as silica feedstock were purified. Residual boron content was determined by inductively coupled argon plasma atomic emission spectrometry. Following extraction using a microchannel device, the residual boron content was less than 1.0 ppm for the former silica feedstock and than 2.5 ppm for the latter one, and the contact reaction period was 0.03 seconds for both type of silica feedstock. These are lower and significantly shorter due to much shorter diffusion distance and much larger specific interfacial area as compared to those observed when using a conventional separatory funnel, for both types of silica feedstock. Hence, it is suggested that microchannel devices can be utilized as an attractive approach toward the production of high-purity silica as a source for solar-grade silicon.

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