Preparation of particulate radioactive waste mixtures

Details Preparation of particulate radioactive waste mixtures Preparation of particulate radioactive waste mixtures

1986-10-27

1988-10-18

Lechert, Jr., Stephen J.

Compositions

Radioactive compositions

2505061, 252629, 252633, 264 05, 264332, 419 48, 419 51, 501 12, G21F 916, G21F 912

Patent

active

047786264

ABSTRACT:
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 immobilized. 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.

REFERENCES:
patent: 4172807 (1979-10-01), Larker
patent: 4274976 (1981-06-01), Ringwood
patent: 4409029 (1983-10-01), Larker et al.
patent: 4642204 (1987-02-01), Burstrom et al.
patent: 4645624 (1987-02-01), Ramm et al.
patent: 4654172 (1987-03-01), Matsuda et al.
Johnson, Nuclear Waste-A Better Way to Bury It?, Popular Science, May 1983, pp. 68-71.
Roy, et al., 1982, [NZP], A New Radiophase for Ceramic Nuclear Waste Forms, Mat. Res. Bull., vol. 17, pp. 585-589, Pergamon Press Ltd.
Walgate, R., 1978, Nuclear Waste May Be Stored in Synthetic Rock, Nature, vol. 274(3): 413.
Ringwood et al., 1979, The Synnoc Process: A Geochemical Approach to Nuclear Waste Immobilization, Geochemical Journal, vol. 13, pp. 141-165.

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