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Sulfuric acid breakdown of fluorite in the presence of silica

  • Synthesis and Properties of Inorganic Compounds
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Abstract

We study the reaction of CaF2 with concentrated sulfuric acid in the presence of silica at 120 and 140°C using fluorite mineral, fluorite concentrate, and mica-fluorite ore samples. When steam is fed to the reaction mixture, fluorosilicic acid is formed and then distilled off, materially influencing the fluoride ion recovery. Addition of quartz makes the reaction to proceed in the kinetic area and increases the fluoride ion recovery, while the presence of mica-bound SiO2 displaces the reaction to the diffusion area and decreases the fluoride ion recovery. We have found that rare alkali metals are concentrated as hexafluorosilicates in the insoluble residue during the sulfuric acid breakdown of fluorite in the presence of SiO2.

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Authors and Affiliations

  1. Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia

    G. F. Krysenko, P. S. Gordienko & D. G. Epov

Authors
  1. G. F. Krysenko
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  2. P. S. Gordienko
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  3. D. G. Epov
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Additional information

Original Russian Text © G.F. Krysenko, P.S. Gordienko, D.G. Epov, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 12, pp. 1958–1961.

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Krysenko, G.F., Gordienko, P.S. & Epov, D.G. Sulfuric acid breakdown of fluorite in the presence of silica. Russ. J. Inorg. Chem. 54, 1876–1879 (2009). https://doi.org/10.1134/S0036023609120055

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  • DOI: https://doi.org/10.1134/S0036023609120055

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