摘要
Abstract
This article takes the lithium precipitation mother liquor as the research object,and uses the extractant A provided by the Institute of Process Science of the Chinese Academy of Sciences to investigate the effects of extractant concentration,O/A,HCl concentration and other conditions in the extraction section,washing section and back extraction section on the lithium extraction effect,lithium sodium separation and lithium back extraction enrichment effect.The result showed that the extraction efficiency of Li,Na,K achieved 99.98%,3.41%and 0.68%,repectively under extractant concentration of 30%and O/A of 1∶1 after three-satge counter-current extraction.The lithium loaded organic phase was scrubbed by using 0.5 mol/L HCl at O/A=5∶1.The scrubbing rate of Li,Na and K reached 3.09%,99.54%and 95.79%,respectively.Additionally,the scrubbed lithium loaded organic phase was stripped by using 4.13 mol/L HCl at O/A=20∶1.The stripping rate of Li achieved>99.5%with Li concentraciton about 23.5 g/L in the stripping solution.The entire process achieved the separation and enrichment of Li from Na and K impurities.关键词
锂高萃取率/锂钠分离/逆流多级萃取-洗涤-反萃Key words
counter-current extraction/lithium and sodium separation/Countercurrent multistage extraction-washing-stripping
