Method of treatment of high-level radioactive waste

Details Method of treatment of high-level radioactive waste Method of treatment of high-level radioactive waste

1991-03-14

1992-01-21

Hunt, Brooks H.

Compositions

Radioactive compositions

252626, 252633, 423 2, 423 3, 423 22, G21F 900

Patent

active

050826034

ABSTRACT:
A method of treatment of a high-level radioactive waste containing platinum group elements is provided in which boron and a boron compound is added to a calcined material of the high-level radioactive waste in an amount of 0.5 to 10% by weight in terms of boron as a simple substance, and the resultant mixture is heated at a temperature of about 1000.degree. C. or above under a reduction condition to melt the mixture and to alloy the platinum group elements present in the calcined material with boron. A layer of the resultant platinum group element alloys is then separated and recovered from a layer of residual oxides through sedimentation. The layer of the residual oxides is solidified to form a highly volume-reduced high-level radioactive solidified waste.

REFERENCES:
patent: 3979498 (1976-09-01), Campbell
patent: 4094809 (1978-06-01), Ross
patent: 4162231 (1979-07-01), Horwitz et al.
patent: 4528011 (1985-07-01), Macedo et al.
patent: 4938895 (1990-07-01), Motojima
Duffy, J. I., Treatment, Recovery and Disposal Processes for Radioactive Wastes, 1983, pp. 187-199.

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