Abstract
The thermal transformations in phosphorites during flash calcination were investigated by FT-IR spectroscopy, X-ray diffraction and chemical analyses. During flash calcination changes occur, both in the composition of the phosphorite and in the crystallochemistry of the fluor-carbonate-apatite (francolite). The former changes include: decomposition of a great part of the calcite in the rock and oxidation of organic matter. The latter changes include: partial removal of the structural carbonate; partial relocation of the remaining carbonate ions in the apatite structure; a new arrangement of hydroxyl groups and fluorine on the hexagonal axis; partial condensation of the orthophosphate groups and increase of crystallite sizes. Isomorphous substitution of PO −34 in apatite by SO −24 and SiO −44 may take place.
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Dedicated to Prof. Menachem Steinberg on the occasion of his 65th birthday
The financial support from Rotem-Amfert-Negev Phosphate Co. is gratefully acknowledged. We thank Dr. B. Pregerson of the Rotem-Amfert-Negev for supplying samples
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Knubovets, R., Nathan, Y., Shoval, S. et al. Thermal transformations in phosphorites. Journal of Thermal Analysis 50, 229–239 (1997). https://doi.org/10.1007/BF01979564
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DOI: https://doi.org/10.1007/BF01979564