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Iron phosphate compositions for containment of hazardous metal waste

Patent ·
OSTI ID:871540
 [1]
  1. Rolla, MO
+ Show Author Affiliations

An improved iron phosphate waste form for the vitrification, containment and long-term disposition of hazardous metal waste such as radioactive nuclear waste is provided. The waste form comprises a rigid iron phosphate matrix resulting from the cooling of a melt formed by heating a batch mixture comprising the metal waste and a matrix-forming component. The waste form comprises from about 30 to about 70 weight percent P.sub.2 O.sub.5 and from about 25 to about 50 weight percent iron oxide and has metals present in the metal waste chemically dissolved therein. The concentration of iron oxide in the waste form along with a high proportion of the iron in the waste form being present as Fe.sup.3+ provide a waste form exhibiting improved chemical resistance to corrosive attack. A method for preparing the improved iron phosphate waste forms is also provided.

Research Organization:
BATTELLE MEMORIAL INSTITUTE
DOE Contract Number:
AC06-76RL01830
Assignee:
Curators of University of Missouri (Columbia, MO)
Patent Number(s):
US 5750824
OSTI ID:
871540
Country of Publication:
United States
Language:
English

References (7)

Structural study of iron in phosphate glasses journal October 1989
Compositions and Durabilities of Glasses for Immobilization of Plutonium and Uranium report February 1995
Redox State of Iron and Its Related Effects in the CaO-P2O5-Fe2O3 Glasses journal January 1991
Lead-Iron Phosphate Glass: A Stable Storage Medium for High-Level Nuclear Waste journal October 1984
Systems approach to nuclear waste glass development journal July 1986
Physical and chemical characteristics of lead-iron phosphate nuclear waste glasses journal January 1986
Electric melting of nuclear waste glasses State of the art journal July 1986

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