Molten Salt Liquid–Liquid Immiscibility, KNO3 – (Li0.435Na0.315K0.25)2CO3 at 773 K and Cation Distribution between Two Liquids. Issue 7 (1st January 2016)

• Record Type: Journal Article
• Authors: Kojima, Toshikatsu; Nomura, Katsuhiro; Kageyama, Hiroyuki
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 7(2016)
• Page Start: H584
• Page End: H587
• Publication Date: 2016-01-01
• Subjects: molten carbonate -- molten nitrate -- molten salt liquid-liquid immiscibility -- nuclear reprocessing; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1091607jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : A mixture of KNO3 and (Li0.435 Na0.315 K0.25 )2 CO3 showed molten salt liquid–liquid immiscibility at 773 K. The XRD patterns of sampled upper and lower portions of the molten salts in a crucible differed greatly and respectively showed patterns resembling those of KNO3 and (Li0.435 Na0.315 K0.25 )2 CO3 . A clear phase boundary observed in the molten state remained in solidified salts. The compositions of the aliquots sampled at upper and lower liquids were determined respectively as Li0.04 Na0.10 K0.86 (NO3 )0.82 (CO3 )0.09 and (Li0.44 Na0.27 K0.29 )2 (NO3 )0.08 (CO3 )0.96 . By adding SrCO3 and Cs2 CO3 to the separated liquids, Sr 2+ was found to exist exclusively in the lower carbonate-rich liquid, and Cs + distributed in the upper liquid: the lower liquid by 91:9. The distribution ratio of cations between the two liquids can be predicted using Coulombic potentials calculated from their ionic radii.