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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium High Temperature Electrochemistry IV
Presentation Title Feasibility of potentiometry for monitoring activity of GdCl3 in molten LiCl-KCl salt
Author(s) Guoping Cao, Steven Herrmann, Guy Fredrickson, Robert Hoover, Kevin Tolman
On-Site Speaker (Planned) Guoping Cao
Abstract Scope In pyroprocessing spent nuclear fuels by electrorefining in LiCl-KCl salt, it is desired to monitor the UCl3 concentration for safeguard purposes. A potentiometry approach was evaluated herein for real time monitoring of GdCl3, a surrogate for UCl3, in LiCl-KCl salt, using a Gd metal electrode and a Ag/AgCl reference electrode (RE). The open circuit potential (OCP) of a Gd metal electrode versus the Ag/AgCl RE was measured, while GdCl3 salt was incrementally added into the LiCl-KCl salt, followed by additions of LaCl3, CeCl3 and NdCl3. It was shown that (1) the potentiometry measurement using Gd metal and Ag/AgCl RE can be used to measure the GdCl3 concentration in the tested 0.05--1.7 mol% GdCl3 range and (2) the addition of a small amount of LaCl3 and CeCl3 did not affect the activity of GdCl3 in the LiCl-KCl-GdCl3 salt system, but the addition of NdCl3 did affect potentiometry measurements of LiCl-KCl-GdCl3.
Proceedings Inclusion? Planned:
Keywords Electrometallurgy, Nuclear Materials, Recycling and Secondary Recovery

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