Accurate model describes rare earths in aqueous solutions

diagram shows Mixed-Solvent Electrolyte (MSE) model for phase equilibrium and speciation calculation. — Mixed-Solvent Electrolyte (MSE) model for phase equilibrium and speciation calculation.

CMI researchers from OLI Systems, Rutgers University and Arizona State University conducted the research for this highlight.

Innovation
Established comprehensive thermodynamic model for aqueous REEs containing both inorganic and organic ligands.

Achievement

Predicts solubility, complexation equilibria, and acid-base equilibria in close agreement with experimental data
Valid for a wide range of pH, salt concentration, temperature, and pressure for oxalates, citrates, and acetates
Process simulations run on ordinary desktop computer.

Significance and Impact
Accurate tool for designing and optimizing separation processes for production and recycling of REEs and for predicting REE properties in geological and biological settings.

Hub Target Addressed
Develop and deploy scientific tools that accelerate the development of relevant technologies.

two line graphs: left shows solubility of neodymium citrate and related phases, and right shows neodymium citrate complexes tunable with pH — Left: Solubility of neodymium citrate and related phases
Right: Neodymium citrate complexes tunable with pH