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Abstract
Decomposition of Kovdor apatite at 1350°C in the mixture with or without II3PO4 and with aluminosilicates (glauconite, nepheline, pseudoleicite) and the solubility in 2% citric acid solution of the calcined phosphate components (P, Ca, Mg, Fe, K, Na, Si) have been studied by chemical and X-ray powder diffraction analysis. The solubility of P2O5 is 56–73% of its total content in the mixture with G, 42-78% with N and 53–82% with P, as the result of formation of solid solution α-Ca3(PO4)2-α-Ca2SiO4 and β-(Ca, Mg)3PO4)2. The formation of more fluorine-rich apatite during heating was established.