G - Physics – 21 – F
Patent
G - Physics
21
F
31/89
G21F 9/16 (2006.01) B01F 7/08 (2006.01) B01F 13/10 (2006.01) C04B 35/645 (2006.01)
Patent
CA 1288586
ABSTRACT OF THE DISCLOSURE A dry, pourable particulate mixture of nuclear waste and synthetic rock-forming components is produced by supplying the rock forming components in dry particulate form to a mixer, supplying the nuclear waste in liquid phase and operating the mixer to distribute the waste substantially uniformly through the synthetic rock components; the mixture is calcined to produce a precursor powder which is adapted to be used in a hot pressing process to form synthetic rock throughout which the radioactive nuclear waste is distributed and immobilised. A reducing gas atmosphere is preferably maintained in the calcining process stage, the gas being for example pure hydrogen or a mixture of hydrogen in nitrogen in proportions which are non-explosive. A screw type or paddle type conveyor can be used for the mixing and calcining stages although the calcining can be effected in a vertically downwardly directed tube device having associated heating means such as microwave heating.
521629
Buykx Wilhelmus Joseph
Ramm Eric John
Ringwood Alfred Edward
Australian Atomic Energy Commission
Bkp Gp
The Australian National University
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