Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 207, Issue -, Pages 1-11Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.06.012
Keywords
Selective-electrodialysis (S-ED); Recovering lithium; High Me2+/Li+ ratio; Ion-fractionation; Coexisting ion
Categories
Funding
- Program for the Top Young Innovative Talents of Hebei Province
- Tianjin Research Program of Application Foundation and Advanced Technology [12JCQNJC03300]
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) [IRT14R14]
- National Natural Science Foundation of China [20806019]
- Natural Science Foundation of Hebei Province [B2009000024, B2017202246]
- Education Department of Hebei Province [2008112]
- Key Technologies R&D Program of Hebei Province of China [12276713D]
- Applied Basic Research Project of Hebei Province [13963103D]
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Selective-electrodialysis (S-ED) is a booming technology for recovering lithium from salt lake brine and (concentrated) seawater, especially from high Mg2+/Li+ ratio brines. The coexisting ions in the solutions containing lithium can make some impact on the ion fractionation of lithium and magnesium in high Mg2+/Li+ brines. The effect of the concentration of coexisting cations (Na+, K+) and anions (SO42-, HCO3-) on the separation coefficient of magnesium and lithium (F-Mg center dot Li), recovery ratio of Li+ (R-Li), current efficiency (eta) and specific energy consumption (E-SEC) was evaluated. The results show that an applied voltage of 6 V is more preferable for lithium ions recovery from high Mg2+/Li+ brines by S-ED. The separation of Mg2+/Li+ tends to unsatisfactory with increasing cation concentration (Na+, K+), and FMg-Li drops from 8.73 to 1.83 with the increase of Na+/Li+ from 1 to 5 and from 8.33 to 2.13 with the rise of K+/Li+ from 1 to 5. The strength of influence on the separation of Mg2+/Li+ is K+ > Na+, correlating with the order of their hydrated ion radiuses. However, FMg-Li rises from 7.99 to 14.66 with the increase of SO42-, reversing with the influence of cations concentration. As for HCO3-, the variation tendency of FMg-Li is opposite to R-Li, probably ascribing to the appearance of MgHCO3+. These observations showed that S-ED has a wide adaptability for the ion fractionation of magnesium and lithium from brines.
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