Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (9): 136 doi: 10.1007/s41365-019-0656-5


Electrorefining of nickel from nickel-chromium alloy in molten LiCl-KCl

Tie-Jian Zhu, Wei Huang, Qing-Nuan Li   

  1. Department of Radiochemistry, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2018-12-28 Revised:2019-04-08 Accepted:2019-05-05
  • Contact: Tie-Jian Zhu
  • Supported by:
    This work was supported by the National Nature Science Foundation of China (Nos. 21601200 and 21771188), Strategic Priority Research Program and Frontier Science Key Program (Nos. XD02030000 and QYZDY-SSW-JSC016) of the Chinese Academy of Sciences.
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Tiejian Zhu, Wei Huang, Qingnuan Li. Electrorefining of nickel from nickel-chromium alloy in molten LiCl-KCl.Nuclear Science and Techniques, 2019, 30(9): 136     doi: 10.1007/s41365-019-0656-5

Abstract: Electrorefining of nickel in LiCl–KCl melt was investigated using electrochemical techniques. Nickel products after electrorefining were characterized by X-ray diffraction, X-ray fluorescence, and scanning electron microscopy. Both cyclic voltammetry and square wave voltammetry results suggested that Ni2? was directly reduced to Ni metal in LiCl–KCl. Based on a preliminary study on the electrochemical behavior of nickel and chromium, electrorefining was carried out under constant potential, whereupon deposits were formed on the cathode. The purity of nickel increased from 72.62% in the original alloy to 99.83% in cathodic deposits, as determined by inductively coupled plasma atomic emission spectroscopy analysis. Almost all the nickel in the alloy could be recovered during the electrochemical process with[90% current efficiency. A lower concentration of NiCl2 in LiCl– KCl was found to be favorable for nickel electrorefining, as increased NiCl2 concentration caused severe corrosion of the nickel anode at the gas–liquid interface due to the accumulation of Cl2 gas.

Key words: Electrorefining, Nickel, Molten salt, Alloy, LiCl–KCl