含Ni^(2+),Fe^(3+),Mg^(2+)的硫酸盐溶液萃取分离Cu^(2+)

Extraction Cu^(2+) via sulfates solution containing Fe^(3+),Mg^(2+) and Ni^(2+)

采用Lix984作萃取剂,煤油作稀释剂混合而成溶液萃取的有机相,从含Ni^(2+),Fe^(3+),Mg^(2+)离子的硫酸盐溶液中萃取分离Cu^(2+).实验结果表明,在一定范围内,铜萃取率随萃取剂浓度的升高、相比的增加、萃取时间的延长、初始水相pH值的增加、萃取温度的升高以及搅拌时间的延长而增加.本实验的优化条件为萃取剂体积分数达60%,相比为O∶A=2∶1,萃取时间为16 min,萃取初始水相pH值为2.5,萃取温度在25~45℃之间,搅拌速度为240 r/min.在最佳条件下,铜萃取率高达95.55%.Fe^(3+)萃取率为8.82%,Ni^(2+)的萃取率为5.47%,Mg^(2+)的萃取率为2.36%.从而达到Cu^(2+)与其它金属离子有效分离的效果.

Taken Lix984 as an organic phase extraction agent, kerosene as a diluent for the solvent extraction, extraction of Cu2＋ was conducted via sulfates solution containing Fe3 ＋ , Mg2 ＋ and Ni2 ＋ . The experimental results showed that in a certain range, copper extraction ratio increases with extractant concentration, the extraction time, the initial pH value, extraction temperature and stirring time. The optimum of conditions are： the extractant concentration is up to 60% , the phase ratio of organic phase to aqueous one is 2 ： 1, the extraction time is 16 min and the initial aqueous phase pH value is 2. 5. Under the optimum conditions, the extraction ratio of Cu2＋ reaches 95. 55% , that of Fe3＋ is only 8. 82% , that of Ni2＋ is 5. 47% , and that of Mg2＋ is 2. 36% . It is believed that the extraction process can realize separation of Cu2 ＋ from the other ions.