首页|Mechanism and process for the extraction of lithium from the high magnesium brine with N,N-bis(2-ethylhexyl)-2-methoxyacetamide in kerosene and FeCl3
Mechanism and process for the extraction of lithium from the high magnesium brine with N,N-bis(2-ethylhexyl)-2-methoxyacetamide in kerosene and FeCl3
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The degradation of TBP has become a stumbling block to the industrial continuous production of lithium chloride extraction from brines with high Mg/Li ratio by solvent extraction. To develop a more stable and more efficient extraction system, a novel amide system, containing newly synthesized extractant N,N-bis (2-ethylhexyl)-2-methoxyacetamide (NBEHMOA), FeCl3 6H20 and sulfonated kerosene, was proposed in this work. Compared with TBP and N523, NBEHMOA extracted Li+ and H+ in the sequence of TBP > NBEHMOA > N523 and N523 > TBP > NBEHMOA respectively. The solution containing 5.5 mol/L LiCl and 0.5 mol/L HC1 was used as the eluent in the scrubbing process. A Li+ extraction efficiency of 96.7% and 22.31 g/L Li+ in the stripping solution were achieved by the whole process with counter-current twelve stages. The extraction mechanism investigated via FT-IR spectroscopy illustrated that the metal ions Fe~(3+) and Li+ were mainly coordinated by the carbonyl C = 0 in NBEHMOA. This novel amide system can successfully achieve the cascade extraction effect for lithium, Li/Mg separation and avoid the generation of phase interface objects through counter-current extraction of lithium from brine at a lower acidity. This work provided a novel extraction system to recover lithium from the higher magnesium/lithium ratio brines.
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Engineering Laboratory for Green Applications of Salt Lakes and Salt Deposits, Qinghai Technology Research and Development Center of Comprehensive Utilization of Salt Lakes Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China
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