Investigation of the range of fluoride ion concentration applicable to calcium fluoride crystallization

Translated title of the contribution: Investigation of the range of fluoride ion concentration applicable to calcium fluoride crystallization

Shiro Kaneko, Izumi Hirasawa

    Research output: Contribution to journalArticle

    Abstract

    Fluoride ion removal by calcium fluoride crystallization was studied. This study aimed to find the range of fluoride ion concentration which would be applicable to calcium fluoride crystallization. First, batch experiments without a seed crystal were conducted to obtain the relationship between initial fluoride ion concentration and calcium ion concentration where fluoride ion concentration would begin to decrease in the process of calcium fluoride precipitation. Batch experiments using a seed crystal were then conducted under the same conditions as those without a seed crystal to obtain the relationship between initial fluoride ion concentration and calcium ion concentration where fluoride ion concentration would begin to decrease due to crystallization of calcium fluoride on the seed crystal. Supersolubility curves of calcium fluoride were obtained from both sets of experiments. From these, the metaslable region of calcium fluoride between the solubility curve and the super-solubility curve was obtained. The range of fluoride ion concentration applicable to calcium fluoride crystallization was found to be less than 3 mmol/l. XRD of the grown calcium fluoride crystals was investigated. The main peaks of the calcium fluoride used in the experiments were found to agree with the literature values.

    Original languageJapanese
    Pages (from-to)399-403
    Number of pages5
    JournalKagaku Kogaku Ronbunshu
    Volume31
    Issue number6
    DOIs
    Publication statusPublished - 2005

    Fingerprint

    Calcium Fluoride
    Calcium fluoride
    Crystallization
    Fluorides
    Ions
    Crystals
    Calcium
    Solubility
    Experiments

    Keywords

    • Calcium Fluoride
    • Crystallization
    • Fluoride Ion Removal
    • Mctastable Region
    • Supersolubility Curve

    ASJC Scopus subject areas

    • Materials Science (miscellaneous)

    Cite this

    Investigation of the range of fluoride ion concentration applicable to calcium fluoride crystallization. / Kaneko, Shiro; Hirasawa, Izumi.

    In: Kagaku Kogaku Ronbunshu, Vol. 31, No. 6, 2005, p. 399-403.

    Research output: Contribution to journalArticle

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    AB - Fluoride ion removal by calcium fluoride crystallization was studied. This study aimed to find the range of fluoride ion concentration which would be applicable to calcium fluoride crystallization. First, batch experiments without a seed crystal were conducted to obtain the relationship between initial fluoride ion concentration and calcium ion concentration where fluoride ion concentration would begin to decrease in the process of calcium fluoride precipitation. Batch experiments using a seed crystal were then conducted under the same conditions as those without a seed crystal to obtain the relationship between initial fluoride ion concentration and calcium ion concentration where fluoride ion concentration would begin to decrease due to crystallization of calcium fluoride on the seed crystal. Supersolubility curves of calcium fluoride were obtained from both sets of experiments. From these, the metaslable region of calcium fluoride between the solubility curve and the super-solubility curve was obtained. The range of fluoride ion concentration applicable to calcium fluoride crystallization was found to be less than 3 mmol/l. XRD of the grown calcium fluoride crystals was investigated. The main peaks of the calcium fluoride used in the experiments were found to agree with the literature values.

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