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Recovery of iron and rare earth elements from red mud through an acid leaching-stepwise extraction approach

酸浸-分步萃取法从赤泥中回收铁和稀土

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Abstract

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.

摘要

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。

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Xue-kai Zhang  (张雪凯), Kang-gen Zhou  (周康根), Wei Chen  (陈伟), Qing-yuan Lei  (雷清源), Ying Huang  (黄颖) & Chang-hong Peng  (彭长宏)

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  1. Xue-kai Zhang  (张雪凯)
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Correspondence to Kang-gen Zhou  (周康根).

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Foundation item: Project(21707167) supported by the Natural Science Foundation of China

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Zhang, Xk., Zhou, Kg., Chen, W. et al. Recovery of iron and rare earth elements from red mud through an acid leaching-stepwise extraction approach. J. Cent. South Univ. 26, 458–466 (2019). https://doi.org/10.1007/s11771-019-4018-6

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