| ArticleName |
Study of the structural and chemical features of fluorapatite of the Khibiny Massif as a potential raw material for processing |
| Abstract |
The article discusses the specific features of changes in the chemical composition of fluorapatite from the Khibiny Massif and the possible consequences of changes in its processing properties that may lead to lower apatite concentrate grades. Fluorapatite contains more than ten chemical elements, the main being P2O5, CaO, F, SrO and TR, with SiO2, Na2O and H2O constantly present in small quantities. Due to the widespread iso- and heterovalent isomorphism, the chemical composition of the Khibiny apatite differs significantly from the theoretical values. The boundaries of respective isomorphic substitutions have not yet been sufficiently studied. It is especially important to study the P2O5 content. The available data indicate a relationship between he content of Sr, TR, SiO2, and P2O5 in apatite. With a transition from apatite-nepheline ores to host rocks and an increase in the urtite component in the ores, the P2O5 content in apatite (according to averaged data) decreases from 40.66 to 38.55 %. This is due to the presence of apatite with a low phosphorus content. The share of low-phosphorus apatite ranges from 4.1 to 7 % in the ores, from 13 to 27 % in urtites, and exceeds 55 % in foyaites. Low-phosphorus fluorapatite differs from the normal mineral by lower grain sizes and a more complex relationship with mafic minerals, which reduces its liberation and recovery. Low-phosphorus fluorapatite has a larger unit cell and higher density. It is assumed that it would be characterized by improved flotation properties due to an increase in the number of flotation ions on the surface of its crystal lattice.
The authors would like to thank Chief Process Engineer of JSC «Apatit» A. I. Kalugin for the support in the work and A. A. Telezhkin (JSC «Apatit») for the assistance in studying the minerals. The work was completed under research and development topic No. 0226-2019-0053 of the Geological Institute of the Kola Science Center of RAS. |
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