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用协同萃取体系LIX 63和Versatic 10添加/不添加TBP从模拟多金属废水中萃取Ni~(2+)和Co~(2+),并去除杂质离子Mn~(2+),Mg~(2+)和Ca~(2+).向LIX 63/Versatic 10协同萃取体系中加入TBP用于加快Ni~(2+)的反萃,考察了萃取、反萃条件对Ni~(2+)和Co~(2+)萃取率、杂质去除率的影响.结果表明,Lix63,Versatic10和TBP浓度分别为0.6,0.4,0.8 mol/L时,Ni~(2+)和Co~(2+)的协萃系数达到最大,分别为33.29和8.23,且30 min内Ni~(2+)的反萃率达到90%.确定较优萃取操作条件为:萃取温度40±0.5℃、萃取平衡p H=4.5、萃取相比A/O 1:1、皂化率40%;反萃过程用1 mol/L H2SO4为反萃剂,根据Mc Cabe–Thiele图,在萃取相比A/O 1:1的条件下,经过三级逆流萃取,Ni~(2+)和Co~(2+)的萃取率分别达98.6%和99.9%,在反萃相比A/O为1:10的条件下,经三级逆流反萃,负载反萃水相含88.12 g/L Ni~(2+),4.52 g/L Co~(2+),1.21 g/L Mn~(2+),0.27 g/L Mg~(2+),Ca~(2+)低于0.2 mg/L.
Extraction of Ni2 + and Co2 + from simulated multi-metal wastewater by adding / not adding TBP with the synergistic extraction system LIX 63 and Versatic 10, and removal of impurity ions Mn2 +, Mg2 + +) And Ca ~ (2+). Adding TBP to the LIX 63 / Versatic 10 synergistic extraction system accelerated the stripping of Ni 2+, and the effects of extraction and stripping conditions on the activity of Ni 2+ and Co 2+ extraction rate and impurity removal rate.The results showed that when the concentrations of Lix63, Versatic10 and TBP were 0.6, 0.4 and 0.8 mol / L, the contents of Ni 2+ and Co 2+ The stripping coefficient was 33.29 and 8.23 respectively, and the stripping rate of Ni 2+ reached 90% in 30 min.The optimum extraction conditions were: extraction temperature 40 ± 0.5 ℃, extraction equilibrium p H = 4.5, compared with 1/1 of A / O, the saponification rate was 40%. The stripping process was performed with 1 mol / L H2SO4 as stripping agent. According to the Mc Cabe-Thiele plot, Under the conditions of stripping ratio A / O 1:10, the extraction rates of Ni 2+ and Co 2+ reached 98.6% and 99.9% Stage counter-current stripping and loading stripping aqueous phase containing 88.12 g / L Ni2 +, 4.52 g / L Co2 +, 1.21 g / L Mn2 +, 0.27 g / L Mg ~ (2 +), Ca 2+ lower than 0.2 mg / L.