Platinum for High Temperature Crucibles Used in Processing Radioactive Wastes

Waste Solidification Program Summary Report. Volume 11. Evaluation of Wsep High Level Waste Solidification Processes.

“…Although the cause of the severe foaming in pot calcination was not specifically determined, it was found during the radioactive phosphate glass runs in WSEP that the presence of small (30 to 1600 ppm) quantities of dibutyl phosphate in the Purex 1WW waste used for feed makeup caused severe foaming in the denitrator evaporator when the wastes were concentrated. (11) Because of the foaming experienced in the early pot calcination runs and in the phosphate glass denitrator evaporator, a silicone antifoam agent (Dow Corning Antifoam-B) was added continuously to the pot calciner during Runs PC-7 and PC-8. The antifoam was made up as an aqueous solution (6.75 g antifoam/liter) and added as a separate additive stream directly to the pot at 0.8 to 1 liter/hour.…”