磷酸三丁酯和二异丙醚溶剂萃取体系净化湿法磷酸的研究

Purification of wet-process phosphoric acid by solvent extraction with tri-n-butyl phosphate and diisopropyl ether

以磷酸三丁酯(TBP)与二异丙醚为溶剂,采用溶剂萃取法净化湿法磷酸。研究了萃取剂中TBP体积分数、相比、萃取时间、搅拌转速、反萃取剂加入量对湿法磷酸净化效果的影响,确定了TBP与二异丙醚混合溶剂体系净化湿法磷酸的工艺条件。适宜工艺条件:萃取剂组成为TBP与二异丙醚体积比为1∶1,有机相与水相的体积比为4∶1,萃取时间为25 min,搅拌转速为300 r/min,反萃取剂加入量为萃取相体积的20%。在此条件下,TBP与二异丙醚萃取体系对金属阳离子和氟离子有较好的分离能力。

Purification of wet phosphoric acid （WPA） was studied by solvent extraction with a mixture of tri-n-butyl phosphate （TBP） and diisopropyl ether（DIPE ）.Influences of factors, such as volume fraction of TBP, phase ratio, extraction time, agitator speed, and the adding amount of re-extraction agent on WPA extraction effect were investigated and the process conditions were determined as follows ： the volume ratio of TBP and DIPE was 1 ： 1, volume ratio of organic phase and water phase was 4：1, extraction time Was 25 min, agitator speed was 300 r/min, and the adding amount of re-extraction agent was 20% of the volume of the organic phase.Under those conditions ,the TBP and DIPE extraction system had a good separation ability for metal cations and fluoride ions.