Abstract
Fluoride activation has been evaluated by Hallimond tube flotation of collophanite in terms of fluoride concentration, conditioning time, pH, and temperature. The results reveal that efficient oleate flotation of collophanite can be achieved by fluoride activation. Experimental results of fluoride adsorption by collophanite suggest that, at low fluoride concentration, a fluoroapatite-type compound may form on the collophanite surface by chemisorption of fluoride ions at calcium sites. At high fluoride concentration, calcium fluoride appears to form at the collophanite surface involving a surface precipitation phenomenon. The formation of CaF2 on the surface of fluoride-treated collophanite is further substantiated by the FTIR spectroscopic measurements, which suggest a meta-thetic exchange with phosphate from the collophanite lattice during the surface precipitation process.
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SME preprint 86-378, SME Fall Meeting, St. Louis, MO, September 1986. MMP paper 86-666. Manuscript September 1986. Discussion of this paper must be submitted, in duplicate, prior to Oct. 31, 1987.
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Miller, J.D., Misra, M., Yehia, A. et al. Fluoride activation in oleate flotation of collophanite. Mining, Metallurgy & Exploration 4, 133–139 (1987). https://doi.org/10.1007/BF03402680
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DOI: https://doi.org/10.1007/BF03402680