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Electrochemical Co-reduction of Bi(III) and Y(III) and Extracting Yttrium from Molten LiCl-KCl Using Liquid Bi as Cathode

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Abstract

The electrochemical reaction of Bi(III) and co-reduction behaviour of Bi(III) and Y(III) ions were researched in molten LiCl-KCl on a tungsten(W) electrode employing a range of electrochemical techniques. Cyclic voltammetric and square-wave voltammetric results revealed that the reduction of Bi(III) was a one-step process, with the exchange of three electrons on a W electrode, and diffusion-controlled. The electrochemical curves showed two reduction peaks pertaining to the formation of Bi-Y alloy compounds, because of the co-reduction of Bi(III) and Y(III) by metallic Y deposited on the pre-deposited Bi-coated W electrode and reacting with Bi metal in molten LiCl-KCl. Furthermore, galvanostatic electrolysis was conducted using liquid Bi as cathode to extract yttrium at different current intensities, and the extractive products were analyzed by SEM, EDS and XRD. The results indicated that BiY intermetallic compound was formed in the molten LiCl-KCl-YCl3 system.

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Correspondence to Mei Li or Wei Han.

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Supported by the National Natural Science Foundation of China(Nos.11675044, 11575047, 21790373), the Major Research Plan of the National Natural Science Foundation of China(Nos.91326113, 91226201) and the Fundamental Research Funds for the Central Universities of China(No.HEUCFP201849).

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Li, M., Liu, Y., Sun, Z. et al. Electrochemical Co-reduction of Bi(III) and Y(III) and Extracting Yttrium from Molten LiCl-KCl Using Liquid Bi as Cathode. Chem. Res. Chin. Univ. 35, 60–64 (2019). https://doi.org/10.1007/s40242-018-8252-5

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  • DOI: https://doi.org/10.1007/s40242-018-8252-5

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