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Report No.

Sedimentation behavior of noble metal particles in simulated high-level waste borosilicate glasses

Nakajima, Masayoshi ; Oyama, Koichi ; Morikawa, Yo; Miyauchi, Atsushi; Yamashita, Teruo ; Komamine, Satoshi*; Ochi, Eiji*

Noble metal elements (NME) contained in high level liquid waste (HLLW) are distributed in a vitrification melter. Some part of them forms sediment which causes negative effects to steady operation of the melter. The formation process and characteristics of the sediment is useful information for considering methods of removing or discharging them. Thus the sedimentation observation was carried out by using simulated glass. Samples with 1.1wt% of initial NME concentration held at 1100$$^{circ}$$C indicated zone settling, and the settling rate of interface is constant; 2.4 mm/h. This sedimentation behavior is the type of rapid settling. Following the rapid settling, the settling rate goes slower gradually, this is the type of compressive settling. The samples whose initial NME concentrations are 3.0wt% and 6.1wt% showed compression settling form the beginning. From the settling curve of interface, the maximum concentration of NME in sediment was estimated as around 23-26wt%. This value can specify the properties of sediment to be removed, Also, growth of NME particles was observed by holding at 1100$$^{circ}$$C for up to 2880 hours.



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