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TECHNOLOGY OF PROCESSING OF APATITES IN THE PRODUCTION OF FUSED PHOSPHATES AS MODERN HIGHLY EFFECTIVE FERTILIZERS
Abstract
Apatite is mineral - common name for a number of related minerals of the apatite group with the common formula Ca5(PO4)3(F, OH, Cl). Mmineral species in the group are fluorapatite (F - up to 3.8), chlorapatite (Cl - up to 6.8), hydroxylapatite, carbonate-apatite. Kola apatite concentrate is a promising and raw material for complex processing, allowing to produce, in addition to the basic product пїЅ phosphoric fertilizers, strontium, rare earth elements and fluorine compounds. Despite obvious environmental expedience of complex apatite processing, at present there is the only industrial scheme, providing for extraction of rare earth elements, strontium as by-products and fluorine recovery, based on decomposition of apatite by nitric acid. In creation of the complex phosphates processing technology it should be taken into account that apatite minerals is the main source of phosphorus in the modern industry, and its processing technology must ensure maximum extraction of this very element. As it was shown before, this can be achieved, in particular, with synthesis of glassy and melted phosphate fertilizers, used efficiently in the modern agriculture.
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