Napol’skikh, J.; Shoppert, A.; Loginova, I.; Kirillov, S.; Valeev, D. Selective Recovery of Scandium (Sc) from Sulfate Solution of Bauxite Residue Leaching Using Puromet МТS9580 Ion-Exchange Sorption. Metals2024, 14, 234.
Napol’skikh, J.; Shoppert, A.; Loginova, I.; Kirillov, S.; Valeev, D. Selective Recovery of Scandium (Sc) from Sulfate Solution of Bauxite Residue Leaching Using Puromet МТS9580 Ion-Exchange Sorption. Metals 2024, 14, 234.
Napol’skikh, J.; Shoppert, A.; Loginova, I.; Kirillov, S.; Valeev, D. Selective Recovery of Scandium (Sc) from Sulfate Solution of Bauxite Residue Leaching Using Puromet МТS9580 Ion-Exchange Sorption. Metals2024, 14, 234.
Napol’skikh, J.; Shoppert, A.; Loginova, I.; Kirillov, S.; Valeev, D. Selective Recovery of Scandium (Sc) from Sulfate Solution of Bauxite Residue Leaching Using Puromet МТS9580 Ion-Exchange Sorption. Metals 2024, 14, 234.
Abstract
Rare earth elements (REEs) and Sc are concentrated in aluminum production byproducts. The novel REEs recovery approach, which involves leaching by acid at a pH > 3 in the presence of MgSO4, results in the formation of a pregnant leach solution (PLS) with a low concentration of iron (Fe) and titanium (Ti) and a large quantity of valuable elements. The ion exchange method was acknowledged as the most favorable method used to separate the REEs from PLS. This work studies the application of chelating resin Puromet МТS9580 in the sorption recovery of Sc from sulfate solutions. To analyze the static Sc sorption data, Langmuir, Freundlich, and Temkin isotherm models were used. The Langmuir isotherm model was the best fitted to the experimental data, with a coefficient of determination (R2) of 0.983. The dynamic adsorption experiment was conducted using a PLS and a simulate solution without contaminants. Adsorption of Sc from the simulate solution was better fitted to the Thomas model with a Sc capacity greater than 7 mg mL–1. Because Ti had a gradual decrease in C/C0, which the Thomas model was unable to simulate, the modified dose-response (MDR) model fitted better with PLS. The NaHCO3 solution (200 g L–1) effectively desorbed Sc (>98 %) from simulated and PLS solutions after 1.5 h of stirring in a batch mode.
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