期刊
DESALINATION
卷 317, 期 -, 页码 184-192出版社
ELSEVIER
DOI: 10.1016/j.desal.2013.03.009
关键词
Lithium; Extraction; Salt lake brine; Nanofiltration; Low pressure reverse osmosis; Dialysis
The aim of the present work is to study the separation of lithium from salt lake brines by NF and LPRO. NF90 membrane compared to the XLE a LPRO membrane appeared more efficient for Li+ extraction due to its higher hydraulic permeability to pure water and 0.1 M NaCl solution, its lower critical pressure (Pc = 0), its higher selectivity between monovalent ions (40%) obtained at low operating transmembrane pressure (below 15 bar) and its lower average roughness (105 +/- 10 nm) decreasing the propensity to be fouled. NF90 exhibited 100% rejection of magnesium in the first step separation from brine diluted ten times as 15% for Li+, with a final separation of 85% between Mg2+/Li+. The permeability to the diluted brine is 0.7 L.h(-1).m(-2).bar(-1) usable to size full scale experiments, but the fouling mechanism has to be discovered in the future work. In a second step we have not succeeded to separate totally Li+ and Na+ in the permeate obtained before (15% of separation only between Li+ and Na+). To solve this problem, we did dialysis. We obtained a total separation between Li+ and Na+ with a diffusion flux (4.42 10(-7) mol.s(-1).m(-2) at 20 degrees C) for NaCl 0.1 M 5 times higher for NF90 vs XLE. () 2013 Elsevier B.V. All rights reserved.
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