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Method for solidification of radioactive and other hazardous waste

United States Patent

October 29, 2002
View the Complete Patent at the US Patent & Trademark Office
Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website
Solidification of liquid radioactive waste, and other hazardous wastes, is accomplished by the method of the invention by incorporating the waste into a porous glass crystalline molded block. The porous block is first loaded with the liquid waste and then dehydrated and exposed to thermal treatment at 50-1, C. The porous glass crystalline molded block consists of glass crystalline hollow microspheres separated from fly ash (cenospheres), resulting from incineration of fossil plant coals. In a preferred embodiment, the porous glass crystalline blocks are formed from perforated cenospheres of grain size -400+50, wherein the selected cenospheres are consolidated into the porous molded block with a binder, such as liquid silicate glass. The porous blocks are then subjected to repeated cycles of saturating with liquid waste, and drying, and after the last cycle the blocks are subjected to calcination to transform the dried salts to more stable oxides. Radioactive liquid waste can be further stabilized in the porous blocks by coating the internal surface of the block with metal oxides prior to adding the liquid waste, and by coating the outside of the block with a low-melting glass or a ceramic after the waste is loaded into the block.
Anshits; Alexander G. (Krasnoyarsk, RU), Vereshchagina; Tatiana A. (Krasnoyarsk, RU), Voskresenskaya; Elena N. (Krasnoyarsk, RU), Kostin; Eduard M. (Zheleznogorsk, RU), Pavlov; Vyacheslav F. (Krasnoyarsk, RU), Revenko; Yurii A. (Zheleznogorsk, RU), Tretyakov; Alexander A. (Zheleznogorsk, RU), Sharonova; Olga M. (Krasnoyarsk, RU), Aloy; Albert S. (Saint-Petersburg, RU), Sapozhnikova; Natalia V. (Saint-Petersburg, RU), Knecht; Dieter A. (Idaho Falls, ID), Tranter; Troy J. (Idaho Falls, ID), Macheret; Yevgeny (Idaho Falls, ID)
The United States of America as represented by the Department of Energy (Washington, DC)
09/ 721,963
November 27, 2000
The United States Government has certain rights in this invention including rights pursuant to contract DE-AC07-99ID13727 awarded by the U.S. Department of Energy.