Physico – chemical properties of (MgF2 – CaF2 – (LiF))eut – MgO system as a molten electrolyte for Mg electrowinning

Michal Korenko, Fratišek Šimko, Jarmila Mlynáriková, Carol Larson, Eva Mikšíková, Jozef Priščák, Marta Ambrová, Robert D Palumbo

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Phase diagrams (solubility), density, electrical conductivity and viscosity of molten system (MgF2 – CaF2)eut – MgO have been investigated. The phase diagram of (MgF2 – CaF2 – LiF)eut – MgO and (MgF2 – BaF2)eut– MgO and the density of (MgF2 – CaF2 – LiF)eut – MgO have been also investigated. The solubility of MgO was measured by means of thermal analysis, the density by means of a computerized Archimedean method, electrical conductivity by means of a tube–cell (pyrolytic boron nitride) with stationary electrodes and the viscosity of the melt by computerized torsion pendulum method. It was found that the all investigated properties varied linearly with temperature in all investigated mixtures. On the basis of density values, the molar volume of the melts and partial molar volume have been calculated. The coordinates of the eutectic systems has been established as follows: (CaF2 – MgF2)eut – MgO as 0.30 mol% at 972 °C; (CaF2 – MgF2 – LiF)eut – MgO as 0.20 mol% at 941 °C; and (MgF2 – BaF2)eut. – MgO as 0.25 mol% at 883 °C. The density of the molten system of (CaF2 – MgF2)eut – MgO was found to be at 1000 °C: 2.687 g·cm−3 for the system with 0 mol% of MgO; 2.700 g·cm−3 for the system with 0.30 mol% of MgO and 2.728 g·cm−3 for the system with 0.50 mol% of MgO. The density of the molten system of (CaF2 – MgF2 – LiF)eut – MgO was found to be at 1000 °C: 2.875 g·cm−3 for the system with 0 mol% of MgO; 2.690 g·cm−3 for the system with 0.20 mol% of MgO and 2.650 g·cm−3 for the system with 0.30 mol% of MgO. The viscosity of basic eutectic mixture of (CaF2 – MgF2)eut at 1000 °C was found to be 7.806 mPa·s.

Original languageEnglish (US)
Pages (from-to)535-543
Number of pages9
JournalJournal of Molecular Liquids
Volume275
DOIs
StatePublished - Feb 1 2019

Bibliographical note

Funding Information:
We are grateful to the US Department of Energy ARPA–E program (cooperative agreement DE–AR0000421). This work was also supported by the Slovak Research and Development Agency under the contracts No. APVV–15–0738 and APVV–15–0479 , and by the Slovak Grant Agency ( VEGA 2/0060/18 ).

Publisher Copyright:
© 2018

Keywords

  • Density
  • Electrical conductivity
  • MgF – CaF – (LiF))
  • Molten fluorides
  • Solubility of MgO
  • Viscosity

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