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Title: Phosphate glasses for radioactive, hazardous and mixed waste immobilization

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 % tomore » about 6 mole % potassium oxide. Method of making lead-free phosphate glasses are also provided.« less
Authors:
 [1] ;  [2] ;  [3]
  1. (Middle Island, NY)
  2. (Stony Brook, NY)
  3. (Wading River, NY)
Publication Date:
OSTI Identifier:
871995
Report Number(s):
US 5840638
US patent application 08/772,982
DOE Contract Number:
AC02-76CH00016
Resource Type:
Patent
Research Org:
ASSOC UNIVERSITIES INC
Country of Publication:
United States
Language:
English
Subject:
phosphate; glasses; radioactive; hazardous; mixed; waste; immobilization; lead-free; phosphate; glass; compositions; provided; immobilize; level; level; radioactive; wastes; monolithic; waste; forms; glass; composition; waste; contained; therein; lead-free; phosphate; glass; compositions; prepared; 900; degree; mixtures; mole; mole; iron; iii; oxide; mole; mole; aluminum; oxide; 15; mole; 20; mole; sodium; oxide; potassium; oxide; 30; mole; 60; mole; phosphate; provides; phosphate; lead-free; glass; ceramic; glass; compositions; prepared; 400; degree; 450; degree; mole; mole; sodium; oxide; 20; mole; 50; mole; oxide; 30; mole; 70; mole; phosphate; mole; mole; aluminum; oxide; mole; mole; silicon; oxide; mole; mole; iron; iii; oxide; mole; mole; potassium; oxide; method; lead-free; phosphate; glasses; provided; lead-free phosphate; lead-free phosphate; lead-free phosphate; monolithic waste; glass compositions; glass compositions; glass compositions; waste form; glass ceramic; mixed waste; aluminum oxide; aluminum oxide; radioactive waste; contained therein; silicon oxide; glass composition; glass composition; glass composition; glass composition; radioactive wastes; phosphate glass; phosphate glass; phosphate glass; phosphate glass; sodium oxide; sodium oxide; phosphate glasses; phosphate glasses; level radioactive; waste forms; compositions prepared; waste immobilization /501/588/