CS_2を用いた熱重量分析によるCeO_2の硫化挙動の検討

概要

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For the recovery of nuclear materials from the spent nuclear fuel, the sulfide process which consists of voloxidation of spent fuel and selective sulfurization of fission products has been proposed. In this paper, cerium was used as a stand-in of plutonium as well as one of rare-earth elements of fission products. Sulfurization behavior of cerium dioxide by CS2 was studied by thermogravimetry (TG) and X-ray diffraction (XRD) methods. From the TG results, it was found that the sulfurization reaction begun at temperatures higher than 450°C forming tetravalent cerium oxydisulfide. Then the reduction of cerium from tetravalent to trivalent of occurred forming intermediate oxysulfides such as Ce4O4S3, Ce2O2S and Ce10S14O which were identified by XRD. Finally, Ce2S3 was found to be formed at higher temperatures up to 1000°C. The experimental results were in good agreement with those of thermodynamic consideration.
社団法人資源・素材学会の論文
2008-11-25