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The effect of ion exchange on the solubility of fluoride compounds

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Abstract

The influence of ion exchange processes on the apparent solubility of fluoride compounds was examined by observing changes in free F− and total F levels when suspensions of sparingly soluble fluoride species (e.g., CaF2, AlF3) and aluminium smelter wastes were equilibrated with a range of materials having different cation exchange capacities. The exchanger materials used included synthetic resins, clay minerals, a humic acid and Mn(IV) oxide. The amount of fluoride ion released from the fluoride salts and F− rich wastes was found to increase in the presence of solids capable of exchanging cations, and the magnitude of the effect tended to be determined by the number of exchange sites available and the affinity of the fluoride compound cation for the exchange material. In some instances (e.g., with illite and alumina wastes) the released fluoride ion attacked the substrate and formed soluble complex ions.

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Authors and Affiliations

  1. Department of Chemistry, University of Newcastle, 2308, NSW, Australia

    W. F. Pickering, J. Slavek & P. Waller

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  1. W. F. Pickering
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  2. J. Slavek
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  3. P. Waller
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Pickering, W.F., Slavek, J. & Waller, P. The effect of ion exchange on the solubility of fluoride compounds. Water Air Soil Pollut 39, 323–336 (1988). https://doi.org/10.1007/BF00279478

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  • DOI: https://doi.org/10.1007/BF00279478

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