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Synergistic extraction of zinc from ammoniacal solutions using a β-diketone mixed with trialkylphosphine oxide

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Abstract

A simple comparative study of synergistic extraction of zinc from ammonium sulfate and ammonium chloride systems with mixtures of Mextral54-100 and tri-n-alkylphosphine oxide (TRPO) dissolved in n-heptane was described. Various parameters affecting the extraction process were investigated. Experimental results show that extraction from ammonium sulfate is better than that from ammonium chloride under the same conditions owing to the additional complexation between zinc and chloride ions. Total ammonium concentration and pH have a significant effect on zinc extraction efficiency because of the formation of zinc ammine complexes. The synergistic effect is explained by the formation of adduct between zinc chelates and trialkylphosphine oxide. The thermodynamic data show that the extraction reaction is exothermic and stripping is endothermic. Infrared (IR) spectra of the zinc-loaded organic phases were also examined.

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Acknowledgments

This study was financially supported by the National Basic Research Program of China (No. 2014CB643404) and the National Natural Science Foundation of China (Nos. 51174104, 51304093, and 51364022).

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Authors and Affiliations

  1. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Ru-Long Zhu, Xin-Bin Li, Chang Wei, Hui Huang, Min-Ting Li, Cun-Xiong Li & Fu-Li Tang

  2. Yunnan Yuntong Zinc Co., Ltd, Kunming, 650102, China

    Ru-Long Zhu

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  1. Ru-Long Zhu
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  2. Xin-Bin Li
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  3. Chang Wei
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  4. Hui Huang
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  7. Fu-Li Tang
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Correspondence to Chang Wei.

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Zhu, RL., Li, XB., Wei, C. et al. Synergistic extraction of zinc from ammoniacal solutions using a β-diketone mixed with trialkylphosphine oxide. Rare Met. 38, 270–276 (2019). https://doi.org/10.1007/s12598-016-0728-1

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  • DOI: https://doi.org/10.1007/s12598-016-0728-1

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