Abstract
In the course of segregation smelting of rare-earth and rare metal raw materials with a fluxing agent (NaF), two immiscible melts form, one of which is a silicate melt and the other is a phosphate–salt melt. The silicate melt is enriched with Fe2O3, Al2O3, SiO2, and Nb2O5, and the phosphate–salt melt is dominated by P2O5, TR2O3, Sc2O3, and Y2O3, and also with Ca, Sr, and Ba oxides. Chemical reactions between lanthanum orthophosphate and sodium fluoride in the LaPO4–NaF system were studied for developing a technology for processing the phosphate–salt (rare-earth metal) melt. It was found that a metathesis reaction gives double phosphate Na3La[PO4]2 and binary fluoride NaLaF4. The products of crystallization of melts in the LaPO4–NaF system decompose in weak mineral acids unlike those in conventional technology for processing monazite raw material.
Published Version
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