摘要
A feasible approach to selectively recover iron and rare earth elements(REEs)from red mud through acid leaching-coordination-solvent extraction was proposed.The leaching efficiencies of Fe,Al,Ti,Sc,La,Ce,Nd and Y can reach up to 95.9%,82.1%,68.3%,93.3%,82.3%,96.9%,98.3%and 95.6%,respectively,under the optimal condition in the leaching process.Aliquat 336 showed excellent extraction performance of iron in chloride-rich solution,and the maximum extraction efficiency can reach over 96%in one time extraction while the loss of other metals was less than 10%,under the condition of Aliquat 336 concentration(v/v)of 30%,aqueous-organic ratio of 1.0 and extraction time of 20 min.Furthermore,P204 can effectively extract the scandium while Al and most other REEs remain in the aqueous phase.This approach may provide a new insight for the recovery of valuable resources from red mud.
提出了一种"酸浸-配位萃取"选择性回收赤泥中的铁和稀土的新工艺。浸出过程表明,在优化条件下,Fe、Al、Ti、Sc、La、Ce、Nd和Y的浸出率分别可达95.9%,82.1%,68.3%,93.3%,82.3%,96.9%,98.3%和95.6%。Aliquat 336在高氯体系下表现出良好的萃铁性能,以30%Aliquat 336+15%仲辛醇+55%煤油为萃取有机相对浸出液中的铁进行萃取,在相比为1,萃取时间为20 min的条件下,铁单级萃取率可达95.7%,各稀土元素损失率不足10%,铁和稀土有较好的分离效果。以P204对萃铁后液中的钪进行回收,可以将钪富集在萃取剂中与Al和大部分稀土元素分离。
基金
Project(21707167)supported by the Natural Science Foundation of China
