Hazardous or toxic waste destruction or containment – Destruction or containment of radioactive waste – By fixation in stable solid media
Patent
1998-08-07
2000-06-13
Griffin, Steven P.
Hazardous or toxic waste destruction or containment
Destruction or containment of radioactive waste
By fixation in stable solid media
588252, 588256, 588257, 976DIG394, 501155, G21F 934
Patent
active
060751762
ABSTRACT:
A method of immobilizing mixed low-level waste is provided which uses low cost materials and has a relatively long hardening period. The method includes: forming a mixture of iron oxide powders having ratios, in mass %, of FeO:Fe.sub.2 O.sub.3 :Fe.sub.3 O.sub.4 equal to 25-40:40-10:35-50, or weighing a definite amount of magnetite powder. Metallurgical cinder can also be used as the source of iron oxides. A solution of the orthophosphoric acid, or a solution of the orthophosphoric acid and ferric oxide, is formed and a powder phase of low-level waste and the mixture of iron oxide powders or cinder (or magnetite powder) is also formed. The acid solution is mixed with the powder phase to form a slurry with the ratio of components (mass %) of waste:iron oxide powders or magnetite:acid solution=30-60:15-10:55-30. The slurry is blended to form a homogeneous mixture which is cured at room temperature to form the final product.
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A. Waugh, et al., "Sabilization of Low-Level Mixed Waste in Chemically Bonded Phosphate Ceramics", Proceedings of the Int'l Topical Meeting on Nuclear and Hazardous Waste Management, Spectrum '94, Aug. 14-18, 1994, Atlanta, GA, published by the ANS Inc., p. 731-736.
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Aloy Albert S.
Koltsova Tatiana I.
Kovarskaya Elena N.
Macheret Yevgeny
Medvedev Pavel G.
Caress Virginia B.
Gottlieb Paul A.
Griffin Steven P.
Moser William R.
The United States of America as represented by The United States
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