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Removal of Alkaline-Earth Elements by a Carbonate Precipitation in a Chloride Molten Salt

[+] Author Affiliations
Yung-Zun Cho, In-Tae Kim, Hee-Chul Yang, Hee-Chul Eun, Hwan-Seo Park, Eung-Ho Kim

Korea Atomic Energy Research Institute, Daejeon, South Korea

Paper No. ICEM2007-7288, pp. 765-768; 4 pages
doi:10.1115/ICEM2007-7288
From:
  • The 11th International Conference on Environmental Remediation and Radioactive Waste Management
  • 11th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B
  • Bruges, Belgium, September 2–6, 2007
  • Conference Sponsors: Nuclear Division and Environmental Engineering Division
  • ISBN: 978-0-7918-4339-0 | eISBN: 0-7918-3818-8
  • Copyright © 2007 by ASME

abstract

Separation of some alkaline-earth chlorides (Sr, Ba) was investigated by using carbonate injection method in LiCl-KCl eutectic and LiCl molten salts. The effects of the injected molar ratio of carbonate ([K2 (or Li2 )CO3 /Sr (or Ba)Cl2 ]) and the temperature (450–750 °C) on the conversion ratio of the Sr or Ba carbonate were determined. In addition, the form of the Sr and Ba carbonate resulting from the carbonation reaction with carbonates was identified via XRD and SEM-EDS analysis. In these experiments, the carbonate injection method can remove Sr and Ba chlorides effectively over 99% in both LiCl-KCl eutectic and LiCl molten salt conditions. When Sr and Ba were co-presented in the eutectic molten salt, they were carbonated in a form of Ba0.5 Sr0.3 CO3 . And when Sr was present in LiCl molten salt, it was carbonated in the form of SrCO3 . Carbonation ratio increased with a decreasing temperature and it was more favorable in the case of a K2 CO3 injection than that of Li2 CO3 . Based on this experiment, it is postulated that carbonate precipitation method has the potential for removing alkali-earth chlorides from LiCl-KCl eutectic and LiCl molten salts.

Copyright © 2007 by ASME
Topics: Precipitation

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