1968 Volume 17 Issue 11 Pages 517-522
Evaporation and concentration of synthetic Purex 1WW waste solution by submerged combustion were experimentally studied. A mixture of propane and oxygen gases was used as a fuel gas to the quartz-made burner. The following results were obtained: (1) The boiling point of still residue was 10-16°C lower than that in the ordinary evaporator, and volume reduction of the waste solution was performed until the volume reduction ratio (volume of still residue/ volume of feed) reached 0.3. (2) Submerged combustion evaporator having a small, simple structure operated successfully, and thermal efficiency was high. (3) The volume of off-gas may be reduced if carbon dioxide in the flue gas is removed and the combustion in the burner proceeds completely. (4) The solution containing aluminum nitrate was evaporated, and converted into solid after cooling the concentrate down to room temperature.