针对现有钙镁离子较低的分离选择性，以双载体乳化液膜为分离钙镁离子的介质，二（2-乙基己基）磷酸酯（D2EHPA）和二苯并-18-冠醚-6（DB18C6）为金属离子运输的双载体，草酸钠（Na₂C₂O₄）为内相萃取剂，利用载体的高结合能力和独特结构实现钙离子的高选择性分离，并间接得到高浓度镁离子的外水相浓盐水。结果表明，两载体的协同作用有效促进了钙离子的萃取，30 min内钙离子萃取率达99%以上，钙离子的协萃因子为11.54，而镁离子协萃因子仅0.58，且外水相镁离子摩尔比由75.81%变为99.74%。同时，该双载体乳化液膜在分离过程中展现出良好的稳定性，破乳率不超过2%。

In view of current technology's low separation selectivity between calcium and magnesium,a dual-carrier emulsion is proposed for the separation of magnesium from calcium in solution.Taking bis(2-ethylhexyl) phosphate and dibenzo-18-crown-6 as two carriers for transportation of metal ions,sodium oxalate as internal extractant,calcium ion is selectively and efficiently separated by relying on strong chemical combination ability and unique structure of carriers,meanwhile the external solution with high concentrated of magnesium ion is indirectly obtained.It is shown from results that synergistic effect between two carriers promotes the extraction of calcium ions effectively.Within 30 minutes,the extraction ratio of calcium ions achieves 99%,with synergistic extraction factors of 11.54 and 0.58 for Ca²⁺ and Mg²⁺ respectively,while the content of magnesium ion in the external solution increases from 75.81% to 99.74%.This dual-carrier emulsion liquid membrane also shows good stability during the separation,with the demulsification ratio of less than 2%.

毛倩(1994-),女,硕士研究生,研究方向为液膜分离技术和应用,1696042302@qq.com