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Understanding rare earth oxide dissolution in molten fluorides is key for metal production. This study uses in situ microscopy to reveal dissolution kinetics, identifying rate-limiting steps and parameter effects.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Electrochemistry

Background:

  • Rare earth oxide dissolution in molten fluorides is crucial for producing rare earth metals via oxide-fluoride electrolysis.
  • Quantifying dissolution in molten salts is challenging using traditional postmortem analysis.

Purpose of the Study:

  • To investigate the dissolution behavior of Neodymium(III) oxide (Nd2O3) particles in molten fluoride salts.
  • To identify rate-limiting steps and the influence of temperature, salt type, and composition on dissolution kinetics.

Main Methods:

  • In situ observation using confocal scanning laser microscopy.
  • Thermodynamic analysis of oxide dissolution.
  • Kinetic analysis of dissolution rates.

Main Results:

  • Direct observation of Nd2O3 dissolution dynamics in molten fluorides.
  • Identification of key parameters affecting dissolution rates, including temperature and salt composition.
  • Determination of rate-limiting steps in the dissolution process.

Conclusions:

  • In situ confocal scanning laser microscopy provides a robust methodology for studying rare earth oxide dissolution kinetics.
  • The findings offer insights into optimizing rare earth metal production through oxide-fluoride electrolysis.
  • This research establishes a framework for estimating dissolution kinetics in primary and secondary rare earth processing.