Distribution of TR2O3, P2O5, and Nb2O5 between Two Immiscible Melts in the Monazite–SiO2–NaF–Nb2O5–Fe2O3 System
- Authors: Delitsyn L.M.1
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Affiliations:
- Joint Institute for High Temperatures, Russian Academy of Sciences
- Issue: Vol 489, No 2 (2019)
- Pages: 292-297
- Section: Chemical Technology
- URL: https://journals.rcsi.science/0012-5008/article/view/154556
- DOI: https://doi.org/10.1134/S0012500819120048
- ID: 154556
Cite item
Abstract
The monazite–SiO2–NaF–Nb2O5–Fe2O3 system in the isotherm at 1200°C is characterized by a wide region of two immiscible melts: a silicate melt and a phosphate–fluoride (salt) melt. The system is reciprocal; in the salt melt, new rare-earth metal (REM) phases form: binary phosphates and fluoride phosphates of REM and Na, which contain neither Fe, nor Nb. Iron has a strong effect on the immiscibility of the melts: in the absence of iron, the segregation region occupies 50% of the area of the diagram; at 5% Fe2O3, 57%; and at 10% Fe2O3, 70%. REM, P, and Nb oxides are contrastingly distributed between the immiscible melts. Most (95%) of REM and P are concentrated in the phosphate–salt melt, and Nb is concentrated in the iron–silicate melt. If the silicate melt contains no Fe2O3, then the Nb2O5 content is 4.91%; and at a Fe2O3 content of 15.33%, the Nb2O5 content is 6.89%, i.e. is 40% higher.
About the authors
L. M. Delitsyn
Joint Institute for High Temperatures, Russian Academy of Sciences
Author for correspondence.
Email: delitzin@ihed.ras.ru
Russian Federation, Moscow, 125412