Aqueous speciation of zinc chloride in supercritical hydrothermal solutions from 500 to 700°C and 0.5 to 1.0 kb

Etsuo Uchida, Masahiro Naito, Shunnosuke Ubua

    Research output: Contribution to journalArticle

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    Abstract

    Aqueous speciation of zinc to 2N chloride solution was determined experimentally at 500 to 700°C and 0.5 to 1.0 kb by monitoring the effect of NaCl on ion exchange equilibria in the system CaTiO3-ZnTiO3-CaCl2-ZnCl2-H 2O. The Ca/(Ca + Zn) value of the 2N aqueous chloride solution in equilibrium with both CaTiO3 and ZnTiO3 decreased with the increase of NaCl under all experimental conditions. This is due to the formation of tri-chloro zinc complex. The formation constant of tri-chloro zinc complex was estimated to be 1.1, 2.1 and 2.7 at 500, 600 and 700°C, 1 kb, respectively, and 2.6 at 600°C, 0.5 kb in logarithm. The formation constant of tri-chloro zinc complex increases with increasing temperature and decreasing pressure. This suggests that zinc can be effectively leached from rocks and magmas under higher temperature and lower pressure conditions.

    Original languageEnglish
    Pages (from-to)1-9
    Number of pages9
    JournalGeochemical Journal
    Volume32
    Issue number1
    Publication statusPublished - 1998

    Fingerprint

    zinc chlorides
    Zinc
    zinc
    chloride
    Chlorides
    chlorides
    logarithms
    low pressure
    ion exchange
    Ion exchange
    Rocks
    zinc chloride
    rocks
    Temperature
    Monitoring
    monitoring
    rock
    ions
    temperature

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geophysics

    Cite this

    Aqueous speciation of zinc chloride in supercritical hydrothermal solutions from 500 to 700°C and 0.5 to 1.0 kb. / Uchida, Etsuo; Naito, Masahiro; Ubua, Shunnosuke.

    In: Geochemical Journal, Vol. 32, No. 1, 1998, p. 1-9.

    Research output: Contribution to journalArticle

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    AB - Aqueous speciation of zinc to 2N chloride solution was determined experimentally at 500 to 700°C and 0.5 to 1.0 kb by monitoring the effect of NaCl on ion exchange equilibria in the system CaTiO3-ZnTiO3-CaCl2-ZnCl2-H 2O. The Ca/(Ca + Zn) value of the 2N aqueous chloride solution in equilibrium with both CaTiO3 and ZnTiO3 decreased with the increase of NaCl under all experimental conditions. This is due to the formation of tri-chloro zinc complex. The formation constant of tri-chloro zinc complex was estimated to be 1.1, 2.1 and 2.7 at 500, 600 and 700°C, 1 kb, respectively, and 2.6 at 600°C, 0.5 kb in logarithm. The formation constant of tri-chloro zinc complex increases with increasing temperature and decreasing pressure. This suggests that zinc can be effectively leached from rocks and magmas under higher temperature and lower pressure conditions.

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