Process for vitrifying liquid radioactive waste
First Claim
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1. A process for vitrifying liquid radioactive waste, comprising the steps of:
- dissolving at least one water-soluble vitrifying-facilitating inorganic compound selected from the group consisting of boric acid, aluminum hydroxide, lithium nitrate, lithium carbonate, lithium sulfate, magnesium nitrate, magnesium carbonate, magnesium sulfate, calcium nitrate, calcium carbonate, barium nitrate, aluminum nitrate, zinc nitrate, zinc sulfate, zirconium oxynitrate and a hydrate thereof, into a liquid radioactive waste acidified with nitric acidadding to the resulting solution an alcoholic silica sol obtainable through hydrolysis with an acid of at least about 1 part by weight of alkyl silicate to 1 part by weight of the at least one inorganic compound, based on the weight of the oxide, and allowing the resulting solution mixture to gel at a temperature of from room temperature to 50? C.,calcining the resulting gel by microwave radiation, andheating the resulting calcined product to melt, followed by cooling to obtain a vitrified product.
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Abstract
A process for vitrifying liquid radioactive waste is provided.
In this process, a solution of a water-soluble vitrifying-facilitating inorganic compound in liquid radioactive waste is mixed with a solution obtained by hydrolyzing an alkyl silicate and then the solution mixture is left to gel. Thereafter, the resulting gel is irradiated with microwave to calcine the gel, and the calcined gel is further heated to melt and then cooled to obtain a vitrified product.
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Citations
3 Claims
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1. A process for vitrifying liquid radioactive waste, comprising the steps of:
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dissolving at least one water-soluble vitrifying-facilitating inorganic compound selected from the group consisting of boric acid, aluminum hydroxide, lithium nitrate, lithium carbonate, lithium sulfate, magnesium nitrate, magnesium carbonate, magnesium sulfate, calcium nitrate, calcium carbonate, barium nitrate, aluminum nitrate, zinc nitrate, zinc sulfate, zirconium oxynitrate and a hydrate thereof, into a liquid radioactive waste acidified with nitric acid adding to the resulting solution an alcoholic silica sol obtainable through hydrolysis with an acid of at least about 1 part by weight of alkyl silicate to 1 part by weight of the at least one inorganic compound, based on the weight of the oxide, and allowing the resulting solution mixture to gel at a temperature of from room temperature to 50? C., calcining the resulting gel by microwave radiation, and heating the resulting calcined product to melt, followed by cooling to obtain a vitrified product. - View Dependent Claims (2, 3)
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Current AssigneeKabushiki Kaisha Square Enix
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Original AssigneeAgency of Industrial Science & Technology (Government of Japan)
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InventorsYamanaka, Hiroshi, Wakabayashi, Hajimu, Terai, Ryohei, Hara, Shigeo
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Primary Examiner(s)Sebastian, Leland A.
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Assistant Examiner(s)Locker, Howard J.
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Application NumberUS06/395,748Time in Patent Office1,029 DaysField of Search252/629, 252/628, 501/12, 252/632, 264/0.5, 423/326, 423/328, 423/329US Class Current588/12CPC Class CodesC03B 1/00 Preparing the batches chemi...C03B 5/005 of glass-forming waste mate...C03B 5/023 by microwave heatingC03C 1/002 Use of waste materials, e.g...C03C 1/006 to produce glass through we...G21F 9/305 Glass or glass like matrix ...Y02P 40/50 Glass production, e.g. reus...
