Phosphate glasses for radioactive, hazardous and mixed waste imm

Details Phosphate glasses for radioactive, hazardous and mixed waste imm Phosphate glasses for radioactive, hazardous and mixed waste imm

1998-07-27

1999-03-09

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 27, 501155, 501 45, 501 48, 588 11, 106DIG1, C03L 3062, G21F 934

Patent

active

058800450

ABSTRACT:
Lead-free phosphate glass compositions are provided which can be used to immobilize low level and/or high level radioactive wastes in monolithic waste forms. The glass composition may also be used without waste contained therein. Lead-free phosphate glass compositions prepared at about 900.degree. C. include mixtures from about 1 mole % to about 6 mole %.iron (III) oxide, from about 1 mole % to about 6 mole % aluminum oxide, from about 15 mole % to about 20 mole % sodium oxide or potassium oxide, and from about 30 mole % to about 60 mole % phosphate. The invention also provides phosphate, lead-free glass ceramic glass compositions which are prepared from about 400.degree. C. to about 450.degree. C. and which includes from about 3 mole % to about 6 mole % sodium oxide, from about 20 mole % to about 50 mole % tin oxide, from about 30 mole % to about 70 mole % phosphate, from about 3 mole % to about 6 mole % aluminum oxide, from about 3 mole % to about 8 mole % silicon oxide, from about 0.5 mole % to about 2 mole % iron (III) oxide and from about 3 mole % to about 6 mole % potassium oxide. Method of making lead-free phosphate glasses are also provided.

REFERENCES:
patent: 4847008 (1989-07-01), Boatner et al.
patent: 4847219 (1989-07-01), Boatner et al.
patent: 5529960 (1996-06-01), Aitken et al.
patent: 5613244 (1997-03-01), Oden et al.
patent: 5750824 (1998-05-01), Day

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