Cathodic Behaviour of Moisture in LiCl–KCl Eutectic Melt: Applications to Pyroprocessing

  • Litun Swain
  • Gurudas Pakhui
  • Suddhasattwa Ghosh
  • Bandi Prabhakara ReddyEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Presence of moisture in LiCl–KCl eutectic melt is known to be detrimental to its performance during electrorefining of metal fuels. Cyclic voltammetry was used to investigate the redox behaviour of LiCl–KCl eutectic melts containing moisture and compare it with chlorinated melts. Voltammetric signatures of one-step reduction of H\(_2\)O and HCl, adsorption of OH\(^{-}\), and reduction of OH\(^{-}\) to form O\(^{2-}\) were observed. Voltammograms were evaluated based on difference between onset Li\(^{+}|\)Li potential and theoretical equilibrium potential of LiCl in LiCl–KCl eutectic melt and residual cathodic current density estimated in the potential range −1.50 to −2.0 V. This two-point criteria could be helpful in ascertaining purity of eutectic melts applicable for engineering scale applications involving bulk handling of LiCl–KCl eutectic mixture.


Pyroprocessing Moisture Impurities Cyclic voltammetry Theoretical equilibrium potential 


  1. 1.
    Bettelheim A, Broitman F, Mor U (1985) Electrochemical behavior of H\(_2\)O in immobilized salt electrolytes II. Cyclic voltammetry. J Electrochem Soc 132(7):1588–1591CrossRefGoogle Scholar
  2. 2.
    Burris L (1986) Rekindled interest in pyrometallurgical processing. Chem Eng Prog 82:35–39Google Scholar
  3. 3.
    Ghosh S, Reddy BP, Nagarajan K, Kumar KCH (2014) Experimental investigations and thermodynamic modelling of KCl-LiCl-UCl\(_{3}\) system. CALPHAD 45:11–26CrossRefGoogle Scholar
  4. 4.
    Kanzaki Y, Takahashi M (1975) The hydrogen electrode in fused lithium chloride-potassium chloride eutectic containing hydrogen ion. J Electroanal Chem Interfacial Electrochem 58:349–356CrossRefGoogle Scholar
  5. 5.
    Melendres C, Ackerman J, Steunenberg R (1976) Voltammetric study of water in molten LiCl–KCl eutectic. Proc Electrochem Soc PV 1976–6:575–583Google Scholar
  6. 6.
    Yang L, Hudson RG (1959) Equilibrium electrode potentials of some metal-chlorine galvanic cells and activities of some metal chlorides in LiCl–KCl eutectic melt. Trans Met Soc AIME 215:589–601Google Scholar
  7. 7.
    Yang L, Hudson RG (1959) Some investigations of the Ag|AgCl in LiCl–KCl eutectic reference electrode. J Electrochem Soc 106:986–990CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  • Litun Swain
    • 1
  • Gurudas Pakhui
    • 2
  • Suddhasattwa Ghosh
    • 2
  • Bandi Prabhakara Reddy
    • 2
    Email author
  1. 1.Homi Bhabha National Institute (HBNI)Indira Gandhi Centre for Atomic ResearchKalpakkamIndia
  2. 2.Materials Chemistry & Metal Fuel Cycle GroupIndira Gandhi Centre for Atomic ResearchKalpakkamIndia

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