Platinum Metals Rev., 1969, 13, (3), 94
Disposal of Radioactive Wastes
Stability of Platinum Crucibles Exposed to Molten Glass
- F. J. S.
The disposal of radioactive waste material from atomic reactors presents many problems and the U.S. Atomic Energy Commission therefore is developing methods of concentrating liquid residues and converting them to stable solid glass, as has been reported previously in this journal (1).
Platinum and its alloys are used widely in the glass industry because of their resistance to corrosion by the constituents of glass. This property has led naturally to their use in two methods for the fixation of radioactive residues in glass. These are the spray calciner process of the Pacific Northwest Laboratory and the continuous phosphate glass process of the Brookhaven National Laboratory.
E. J. Tuthill, G. Strickland and G. G. Weth, from Brookhaven, have now reported on the comparative merits of platinum and its alloys as crucibles in the latter process, together with long-term studies of the creep of platinum and of its corrosion resistance (2).
A bench-scale platinum crucible 3 inches diameter and 10 inches high with a 40 mil wall withstood 300 thermal cycles to 1200°C with only slight distortion and less than 4 microns transgranular corrosion over 1000 hours’ exposure. A pilot plant vessel 8 inches diameter and 24 inches high supported by a platinum flange and ceramic baseplate has operated for 1400 hours at 1250°C, the glass-making temperature.
- 1Platinum Metals Rev., 1965, 9, ( 3 ), 89
- 2Ind. Eng. Chem., Process Des.Dev., 1969, 8, ( 1 ), 36