高等学校化学学报2013，Vol.34Issue(1)：55-60,6.DOI:10.7503/cjcu20120171
共萃剂ClO4-作用下磷酸三丁酯分离盐湖卤水锂镁
Lithium and Magnesium Separation from Salt Lake Brine by Tributyl Phosphate under Action of Co-extraction Reagent ClO4-
摘要
Abstract
Aiming at salt lake brine with a high ratio of magnesium/lithium, extracting lithium was researched via the extractant tributyl phosphate ( TBP) as well as the co-extraction reagent NaC104, and the effects of temperature, solution pH value, phase ratio, CIO-4 amount and other factors on Li+ extraction rate have been investigated in detail. The optimum operating conditions of a single extraction from brine are the following: the extraction time of 10 min, temperature of 25 ℃, Vo/Vw=2.0, n(C1O-4)/n(Ii+)= 2.0 and pH value in a range of 5—8. Under these conditions, the highest extraction rate for Li+ and Mg2+ was 65.41% and 13. 31% , respectively, and the Li/Mg separation coefficient reached 12. 32. Reversed phase extraction was carried out with water in Vw/V0 = 1.0 and 50℃ , the stripping rate of Li+ reached 81. 52% , and the mass ratio of Mg/Ii decreased from 45. 61 to 8.45. The extraction process of Li+ and Mg2+ presented exothermic effect, metal ions extracted into the organic phase had no effect on the chemical shifts of H in TBP, but made the IR stretching vibration frequencies of P ＝O double bond shift to 1264 cm-1 from 1280 cm-1. The composition of extracted complex of Li+ was close to 2LiClO4 ? 5 TBP determined by the slope method at 25 ℃ and Li2CO3 was prepared by the strip liquor after demagnesium deeply.关键词
ClO4-/磷酸三丁酯/高镁卤水/锂镁分离/溶剂萃取Key words
CIO4 / Tributyl phosphate/ Brine with high Mg content/ Li/Mg separation/ Solvent extraction分类
化学化工引用本文复制引用
杨立新,邬赛祥,刘肖丽,何靖,陈文光..共萃剂ClO4-作用下磷酸三丁酯分离盐湖卤水锂镁[J].高等学校化学学报,2013,34(1):55-60,6.基金项目
国家自然科学基金(批准号:21276215)和湖南省研究生科研创新项目(批准号:CX2010B267)资助. （批准号:21276215）
