研究了采用N235-TBP协同萃取体系从硫酸盐溶液中萃取除铁,考察了萃取体系、N235浓度和料液初始pH值对Fe(Ⅲ)萃取的影响以及相比(Vorg/Vaq)、H2SO4浓度和平衡pH值对Fe(Ⅲ)反萃的影响.结果表明:N235和TBP对硫酸盐溶液中的Fe(Ⅲ)具有协同萃取效应;加入TBP能有效地抑制载铁有机相的分层,提高Fe(Ⅲ)的反萃率;料液初始pH值及N235浓度对Fe(Ⅲ)的萃取率影响显著,萃铁曲线的最高点随着N235浓度的增大向低pH值方向移动;以含30%N235和10%TBP(体积分数)的有机相作萃取剂,在相比(Vorg/Vaq)为2:1的条件下,含铁12.73 g/L的合成料液经过3级错流萃取,萃余液中含铁低于0.15 g/L,铁的总萃取率接近99%;以0.4 mol/L的H2SO4为反萃剂,控制反萃液平衡pH小于0.8,铁的单级反萃率大于96%;含铁7.05 g/L的有机相在相比为1:1时,经过2级错流反萃,铁基本上被反萃完全,贫有机相不经处理可以循环使用.
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