Removal of calcium and magnesium from lithium brine concentrate via continuous counter-current solvent extraction
Virolainen, Sami; Fallah Fini, Mojtaba; Miettinen, Ville; Laitinen, Antero; Haapalainen, Mika; Sainio, Tuomo (2016)
Post-print / Final draft
School of Engineering Science
The effect of the operating parameters (pH, temperature, phase ratio, and residence time) were studied in a bench-scale two-stage continuous counter-current setup with both reagents. The overall performance was good, yielding ppm impurity levels in terms of Ca and Mg and, typically, 3–5% Li co-extraction. While the Mg extraction could be increased by increasing the pH in the mixers and decreasing the A/O phase ratio, the Li co-extraction would also be increased. A compromise must be made between purity and Li yield. Decreasing the temperature or residence time did not have a significant effect on performance. It was demonstrated that a high throughput can be achieved because a mixer residence time of 2 min or even less can be used.
Virolainen, S., Fallah Fini, M., Miettinen, V., Laitinen, A., Haapalainen, M., Sainio, T., 2016. Removal of calcium and magnesium from lithium brine concentrate via continuous counter-current solvent extraction. Hydrometallurgy 162, 9–15. doi:10.1016/j.hydromet.2016.02.010
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