Hazardous or toxic waste destruction or containment – Destruction or containment of radioactive waste – By fixation in stable solid media
Patent
1999-05-05
2000-10-17
Griffin, Steven P.
Hazardous or toxic waste destruction or containment
Destruction or containment of radioactive waste
By fixation in stable solid media
588 4, 588 10, 588252, 264 05, 501111, 501112, 501155, G21F 916
Patent
active
061334987
ABSTRACT:
Known phosphate ceramic formulations are improved and the ability to produce iron-based phosphate ceramic systems is enabled by the addition of an oxidizing or reducing step during the acid-base reactions that form the phosphate ceramic products. The additives allow control of the rate of the acid-base reactions and concomitant heat generation. In an alternate embodiment, waste containing metal anions are stabilized in phosphate ceramic products by the addition of a reducing agent to the phosphate ceramic mixture. The reduced metal ions are more stable and/or reactive with the phosphate ions, resulting in the formation of insoluble metal species within the phosphate ceramic matrix, such that the resulting chemically bonded phosphate ceramic product has greater leach resistance.
REFERENCES:
patent: 5645518 (1997-07-01), Wagh et al.
patent: 5830815 (1998-11-01), Wagh et al.
patent: 5846894 (1998-12-01), Singh et al.
patent: 5939039 (1999-08-01), Sapieszko et al.
Modified Phosphate Ceramics for Stabilization and Solidification of Salt Mixed Wastes, authored by Dileep Singh, Kartikey Patel, Arun S. Wagh, Seung-Young Jeong, published in the Proceedings of Spectrum '98, International Conference on Decommissioning and Decontamination and on Nuclear and Hazardous Waste Management, Denver, Colorado, Sep. 13-18, 1998.
Modified Phosphate Ceramics for Stabilization of Salt Mixed Wastes, thesis authored by Kartikey Patel, submitted for review on or after May 7, 1998 and defended on Jun. 26, 1998.
U.S. Patent Application Ser. No..sub.-- /124,822, Continuation-in-part of U.S. Patent Nos. 5,846,894 and 5,830,815.
U.S. Patent Application Serial No..sub.-- /617,284, Continuation-in-part of U.S. Patent No. 5,830,815.
PCT Patent Application No. PCT/US97/04132.
Jeong Seung-Young
Singh Dileep
Wagh Arun S.
Dvorscak Mark P.
Griffin Steven P.
Moser William R.
Smith Bradley W.
The United States of America as represented by the United States
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