混合醇萃取剂从浓缩盐湖卤水中萃取提硼的实验研究  

Research on extracting boron from concentrated salt lake brine by mixed alcohols

作　　者：郭敏[1,2,3] 封志芳 周园[1,2] 李权[1,2] 张慧芳[1,2] 吴志坚[1,2] 

机构地区：[1]中国科学院青海盐湖研究所中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]青海省盐湖资源化学重点实验室 [3]江西赣锋锂业股份有限公司博士后科研工作站 [4]江西赣锋锂业股份有限公司

出　　处：《无机盐工业》2017年第7期14-18,共5页Inorganic Chemicals Industry

基　　金：江西省对外合作项目(2016ACH80003);国家自然科学基金青年项目(201401209);青海省重点实验室发展专项(2014-Z-Y04)

摘　　要：以2-乙基-1,3-己二醇和异丁醇按照一定体积比组成混合萃取剂、航空煤油为稀释剂,萃取某硫酸盐型盐湖浓缩卤水中的硼。对萃取剂浓度、浓缩卤水pH、萃取相比、萃取温度、萃取时间、饱和萃取容量和反萃剂浓度、反萃相比等进行了实验研究。结果表明:2-乙基-1,3-己二醇、异丁醇和航空煤油体积比为1∶2∶3,卤水pH为3,萃取相比为1∶1,温度为20℃,萃取时间为5 min;将得到的富硼有机相用0.25 mol/L氢氧化钠溶液进行反萃,反萃相比为1∶2、温度为30℃、反萃取时间为15 min。经三级萃取及反萃,卤水中硼质量浓度降为0.8 mg/L,硼萃取率为99.99%,反萃率为99.78%,硼回收率为99.77%,萃取效果好。Boron was extracted from the concentrated brine from a sulfate type salt lake by 2-ethyl-1,3-haxanediol and isobutyl alcohol as mixed extractant （by a certain volume rat io）,and aviation kerosene as diluting agent.The experimental conditions including the concentration of extractant, pH of concentrated salt lake brines,exraction phase ratio（O/A）,extrac-tion temperature,extraction time,saturated extraction capacity,concentration of stripping agent,and back-extraction phase ratio etc.were investigated.Results showed that the optimal conditions were as follows,the volume ratio of 2-ethyl-1,3- haxanediol , isobutyl alcohol , and aviation kerosene was 1： 2：3 , pH=3 , extraction phase rat io（O/A） was 1 1 , reaction tempera-ture was 20 ℃ ,and extraction time was 5 min.At the back extraction stage , with 0.25 mol/L sodium hydroxide solution as stripping agent , 1：2 ofvolume ratio of stripping agent and organic phase , 15 min back-extraction time , and reaction tempera-ture at 30 ℃.After 3 extraction and back-extraction series process , boron concentration of extraction raffinate was 0.8 mg/L , the extraction and back-extraction rate were 99.99% and 99.78% , respectively , and the recovery of boron in the concentrated brines was about 99.77%.

关 键 词：混合醇 萃取 硼酸 浓缩卤水 

分 类 号：TQ128.1[化学工程—无机化工]