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Title: Evaluation of Alkali Bromide Salts for Potential Pyrochemical Applications

Evaluation of Alkali Bromide Salts for Potential Pyrochemical Applications Transient techniques were employed to study the electrochemical behavior, reduction mechanism and transport properties of REBr3 (RE - La, Nd and Gd) in pure LiBr, LiBr-KBr (eutectic) and LiBr-KBr-CsBr (eutectic) melts. Gd(III) showed a reversible single step soluble-insoluble exchange phenomenon in LiBr melt at 973K. Although La (III), Nd(III) and Gd(III) ions showed reversible behavior in eutectic LiBr-KBr melts, these ions showed a combination of temperature dependent reversible and pseudo-reversible behavior. While both La(III) and Gd(III) showed one step reduction, the reduction of Nd(III) was observed to be a two step process. La metal could be electrodeposited from the ternary electrolyte at a temperature of 673K. Various electrochemical measurements suggest that both binary and ternary bromide melts can potentially be used to electrodeposit high purity RE metals at comparatively lower operating temperatures.
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Publication Date:
OSTI Identifier:1111512
Report Number(s):INL/CON-13-28048
DOE Contract Number:DE-AC07-05ID14517
Resource Type:Conference
Data Type:
Resource Relation:Conference: Global 2013: International Nuclear Fuel Cycle Conference,Salt Lake City, Utah,09/29/2013,10/03/2013
Research Org:Idaho National Laboratory (INL)
Sponsoring Org:USDOE
Country of Publication:United States
Subject: 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS molten bromide salts; pyrochemical processing; transient electrochemical techniques