Phosphate glasses for radioactive, hazardous and mixed waste immobilization

Patent · Tue Nov 24 00:00:00 EST 1998

OSTI ID:871995

Cao, Hui ^[1]; Adams, Jay W ^[2]; Kalb, Paul D ^[3]

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1. Middle Island, NY
2. Stony Brook, NY
3. Wading River, NY

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.

• Research Organization: Associated Universities, Inc., Upton, NY (United States)
• DOE Contract Number: AC02-76CH00016
• Assignee: Brookhaven Science Associates (Upton, NY)
• Patent Number(s): US 5840638
• Application Number: 08/772,982
• OSTI ID: 871995
• Country of Publication: United States
• Language: English

Related Subjects

phosphate
glasses
radioactive
hazardous
mixed
waste
immobilization
lead-free
glass
compositions
provided
immobilize
level
wastes
monolithic
forms
composition
contained
therein
prepared
900
degree
mixtures
mole
iron
iii
oxide
aluminum
15
20
sodium
potassium
30
60
provides
ceramic
400
450
50
70
silicon
method
lead-free phosphate
monolithic waste
glass compositions
waste form
glass ceramic
mixed waste
aluminum oxide
radioactive waste
contained therein
silicon oxide
glass composition
radioactive wastes
phosphate glass
sodium oxide
phosphate glasses
level radioactive
waste forms
compositions prepared
waste immobilization
/501/588/