Journal article

Selective removal of iron(III) from highly salted chloride acidic solutions by solvent extraction using di(2-ethylhexyl) phosphate

Guoping Hu, Yue Wu, Desheng Chen, Yong Wang, Tao Qi, Lina Wang

FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING | SPRINGER | Published : 2020

Abstract

Metal ions including Fe3+, Ca2+, Mg2+, Ni2+, Co2+ and Cu2+ are commonly found in the leaching solution of laterite-nickel ores, and the pre-removal of Fe3+ is extremely important for the recovery of nickel and cobalt. Di(2-ethylhexyl)phosphate acid (D2EHPA) showed high extraction rate and selectivity of Fe3+ over other metal ions. The acidity of the aqueous solution is crucial to the extraction of Fe3+, and the stoichiometry ratio between Fe3+ and the extractant is 0.86:1.54. The enthalpy for the extraction of Fe3+ using D2EHPA was 19.50 kJ/mol. The extraction of Fe3+ was ⩾ 99% under the optimized conditions after a three-stage solvent extraction process. The iron stripping effects of differ..

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Grants

Awarded by National Key Research and Development Program of China


Awarded by Key Research Program of Frontier Sciences of Chinese Academy of Sciences


Awarded by National Natural Science Foundation of China


Funding Acknowledgements

This work has been financially supported by the National Key Research and Development Program of China (Grant No. 018YFC1900502), Key Research Program of Frontier Sciences of Chinese Academy of Sciences (Grant No. QYZDJ-SSW-JSC021), the National Natural Science Foundation of China (Grant Nos. 21606241, 51804289 and 51774260), and CAS Interdisciplinary Innovation Team. We also acknowledge the help from Professor Geoffrey W. Stevens with revising the manuscript.