| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Rare Metal Extraction and Processing
|
| Presentation Title |
Effect of Antisolvent Type and Concentration on Morphology and Crystal Size of (NH<sub>4</sub>)<sub>3</sub>ScF<sub>6</sub> Obtained by Antisolvent Crystallization |
| Author(s) |
Edward Michael Peters, Michael Svärd, Kerstin Forsberg |
| On-Site Speaker (Planned) |
Kerstin Forsberg |
| Abstract Scope |
Scandium is a metal of value with increasing demand but limited supply. During the valorization of bauxite residue, scandium becomes concentrated in an NH<sub>4</sub>F strip liquor, from which it can be recovered as (NH<sub>4</sub>)<sub>3</sub>ScF<sub>6</sub> by antisolvent crystallization. This study investigates the use of different antisolvents and their concentrations on the morphology and crystal size of the (NH<sub>4</sub>)<sub>3</sub>ScF<sub>6</sub> crystals produced. The antisolvents include alcohols, ketones and a sulfoxide. These were added all at once, either pure or diluted, to the aqueous solution to attain final concentration of 2, 4 or 8 mol/L total solution in separate experiments. Changes in the functional group and concentration of the antisolvents were observed to induce morphological and crystal size modifications of (NH<sub>4</sub>)<sub>3</sub>ScF<sub>6</sub>. The differences are likely due to the specific interactions of the antisolvent molecules with the atoms at the different faces of the crystals and/or differences in initial supersaturation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Hydrometallurgy, Extraction and Processing, Recycling and Secondary Recovery |