Phosphate glasses for radioactive, hazardous and mixed waste immobilization

Patent · Mon Mar 08 23:00:00 EST 1999

OSTI ID:872180

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: ASSOC UNIVERSITIES INC
• DOE Contract Number: AC02-76CH00016
• Assignee: Brookhaven Science Associates (Upton, NY)
• Patent Number(s): US 5880045
• Application Number: 09/122,470
• OSTI ID: 872180
• Country of Publication: United States
• Language: English

Related Subjects

/501/106/588/
15
20
30
400
450
50
60
70
900
aluminum
aluminum oxide
ceramic
composition
compositions
compositions prepared
contained
contained therein
degree
forms
glass
glass ceramic
glass composition
glass compositions
glasses
hazardous
iii
immobilization
immobilize
iron
lead-free
lead-free phosphate
level
level radioactive
method
mixed
mixed waste
mixtures
mole
monolithic
monolithic waste
oxide
phosphate
phosphate glass
phosphate glasses
potassium
prepared
provided
provides
radioactive
radioactive waste
radioactive wastes
silicon
silicon oxide
sodium
sodium oxide
therein
waste
waste form
waste forms
waste immobilization
wastes