Efficient Lithium Extraction from Low-lithium-concentration Oil and Gas Field Water
SHAN Qiaoli1, ZHANG Fengxi1, TENG Zelin2, ZHANG Fan1, ZHANG Xin3, LIU Jie3,*, WU Guizhi3,XIA Wenxiang3
1 The National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields, Changqing Engineering Design Co., Ltd., Xi’an 710018, China 2 The Fourth Oilfield Company of Changqing, Yulin 719000, Shaanxi, China 3 School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China
Abstract: Lithium is an indispensable strategic resource for national economic development and national defense construction. The oil and gas field water has become a new research hotspot because it contains lithium resources of industrial exploitation value. To low-concentration lithium (as low as 50 mg/L) inoil and gas water, using HBTA as the extractant, and sulfonated kerosene as the diluent, the effects of organic phase properties (types of synergies, composition of organic phase, degrees of saponification), aqueous phase properties (initial lithium concentration, pH value in aqueous phase, temperature) and operating conditions (the phase ratio of water and oil, extraction stage, organic phase continuity and recycling performance) on the extraction efficiency of low concentration lithium were investigated in detail. The results show that TOPO with electron donating ability only has co-extraction effect with saponified HBTA, and that, Na in Na·BTA·TOPO exchanges Li in aqueous solution to form Li·BTA·TOPO extracted complexes. When the concentration of HBTA is 0.020 mol/L, TOPO is 0.020 mol/L, the saponification degree is 100%, and the phase ratio is 1∶1, the single-stage extraction efficiency of lithium can reach 60%. After three-stages extraction, the extraction efficiency can reach more than 90%. The study also find that HBTA/TOPO co-extraction system has good continuous and recycling performance, after 7 consecutive regeneration, the extraction efficiency still maintains in a high level. This findings can provide technical support for the extraction of low concentration lithium in oil and gas field water.
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