【摘要】 锂是国民经济发展和国防建设不可或缺的战略资源。油气田采出水中因含有工业开采价值的锂资源，已成为新的研究热点。以油气田采出水中低浓度锂(低至50 mg/L)为研究对象，以HBTA为萃取剂，详细考察了有机相性质(协萃剂种类、有机相组成、皂化度)、水相性质(初始锂浓度、水相pH值、温度)、操作条件(相比、萃取级数、有机相连续与循环利用性能)等因素对低浓度锂萃取效果的影响。研究发现，TOPO只与皂化后的HBTA产生协萃作用，即以Na·BTA·TOPO中的Na交换水溶液中的Li,形成Li·BTA·TOPO萃合物。常温下，当HBTA浓度为0.020 mol/L,TOPO浓度为0.020 mol/L,皂化度为100%,水油相比为1∶1时，锂的单级萃取率可达60%,经过三级萃取，锂的萃取率可达90%以上。有机相连续再生7次后，仍保持较高的萃取效率。研究结论可为油气田水中低浓度锂的提取提供技术支持。更多还原

【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.更多还原