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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 2    February 2019

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Recovery of iron and rare earth elements from red mud through an acid leaching-stepwise extraction approach
ZHANG Xue-kai(张雪凯), ZHOU Kang-gen(周康根), CHEN Wei(陈伟), LEI Qing-yuan(雷清源), HUANG Ying(黄颖), PENG Chang-hong(彭长宏)

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

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.

 

Key words: red mud; iron; rare earth elements; leaching; solvent extraction

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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