Reaction behavior of stratified SiO2 granules during electrochemical reduction in molten CaCl2

Xiao Yang, Kouji Yasuda, Toshiyuki Nohira, Rika Hagiwara, Takayuki Homma

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    The electrochemical reduction behavior of stratified SiO2 granules in molten CaCl2 at 1123 K (850 °C) was investigated to develop a new process for producing solar-grade silicon. The cross sections of the electrolyzed electrode prepared from a graphite crucible filled with SiO2 granules were observed and analyzed. The visual and SEM observations indicate that the overall reduction proceeds via two different routes. In one route, the reduction proceeds along the granule surfaces from the SiO2 near the conductor to the distant SiO2. In the other route, the reduction proceeds from the granule surface to the core of each granule. The reduction along the granule surfaces is faster than that from the surface to the core. Fine SiO2 granules are expected to be favorable for a high reduction rate.

    Original languageEnglish
    Pages (from-to)1337-1344
    Number of pages8
    JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
    Volume45
    Issue number4
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    Molten materials
    routes
    visual observation
    crucibles
    Graphite
    Crucibles
    Silicon
    grade
    conductors
    graphite
    scanning electron microscopy
    electrodes
    cross sections
    silicon
    Scanning electron microscopy
    Electrodes

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Metals and Alloys
    • Mechanics of Materials
    • Materials Chemistry

    Cite this

    Reaction behavior of stratified SiO2 granules during electrochemical reduction in molten CaCl2 . / Yang, Xiao; Yasuda, Kouji; Nohira, Toshiyuki; Hagiwara, Rika; Homma, Takayuki.

    In: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 45, No. 4, 2014, p. 1337-1344.

    Research output: Contribution to journalArticle

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    AU - Yasuda, Kouji

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    AU - Homma, Takayuki

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