Vitrification of ion exchange resins
First Claim
Patent Images
1. A process for directly vitrifying an organic ion exchange resin having metal ions adsorbed thereon, comprising:
- adding borosilicate glass formers and an oxidizer selected from the group consisting of ferric oxide, a ferric oxide producer, and mixtures thereof, to said organic ion exchange resin to form a glass forming mixture;
directly and continuously heating said glass forming mixture at a substantially constant rate to a temperature of about 1050°
C. to about 1150°
C. for a time sufficient to form a melt; and
cooling the melt to form a vitreous solid.
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Abstract
The present invention relates to vitrification of ion exchange resins that have become loaded with hazardous or radioactive wastes, in a way that produces a homogenous and durable waste form and reduces the disposal volume of the resin. The methods of the present invention involve directly adding borosilicate glass formers and an oxidizer to the ion exchange resin and heating the mixture at sufficient temperature to produce homogeneous glass.
20 Citations
16 Claims
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1. A process for directly vitrifying an organic ion exchange resin having metal ions adsorbed thereon, comprising:
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adding borosilicate glass formers and an oxidizer selected from the group consisting of ferric oxide, a ferric oxide producer, and mixtures thereof, to said organic ion exchange resin to form a glass forming mixture;
directly and continuously heating said glass forming mixture at a substantially constant rate to a temperature of about 1050°
C. to about 1150°
C. for a time sufficient to form a melt; and
cooling the melt to form a vitreous solid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A process for directly vitrifying an organic ion exchange resin having metal ions adsorbed thereon, comprising:
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adding borosilicate glass formers and an oxidizer selected from the group consisting of ferric oxide, a ferric oxide producer, and mixtures thereof, to said organic ion exchange resin to form a glass forming mixture;
heating said glass forming mixture to a temperature and for a time sufficient to form a melt; and
cooling the melt to form a glass composition, wherein the glass composition comprises immobilized organic ion exchange resin and;
about 8 to about 16 wt % B2O3, about 10 to about 15 wt % CaO, about 16 to about 22 wt % Fe2O3, about 8 to about 14 wt % Na2O, about 41 to about 49 wt % SiO2. - View Dependent Claims (15)
about 9 wt % B2O3, about 15 wt % CaO, about 22 wt % Fe2O3, about 8 wt % Na2O, about 46 wt % SiO2.
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16. A process for directly vitrifying an organic ion exchange resin having metal ions adsorbed thereon, comprising:
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adding borosilicate glass formers comprising CaO provided by adding Ca(OH)2 and an oxidizer selected from the group consisting of ferric oxide, a ferric oxide producer, and mixtures thereof, to said organic ion exchange resin to form a glass forming mixture;
directly and continuously heating said glass forming mixture at a substantially constant rate to a temperature and for a time sufficient to form a melt; and
cooling the melt to form a vitreous solid.
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Specification
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Current AssigneeUnited States Department of Energy
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Original AssigneeWestinghouse Savannah River Company
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InventorsWorkman, Rhonda Jackson, Cicero-Herman, Connie A.
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Primary Examiner(s)Griffin, Stephen P.
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Assistant Examiner(s)NAVE, EILEEN ENAD
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Application NumberUS09/354,864Time in Patent Office879 DaysField of Search252/628, 252/629, 588/7, 588/12, 588/13, 588/15, 588/16, 588/256, 501/1, 501/53, 501/55, 501/65, 501/68US Class Current588/12CPC Class CodesC03C 1/002 Use of waste materials, e.g...G21F 9/305 Glass or glass like matrix ...
