Lead iron phosphate glass as a containment medium for disposal of high-level nuclear waste

Patent · Sun Jan 01 00:00:00 EST 1989

OSTI ID:867029

Boatner, Lynn A ^[1]; Sales, Brian C ^[1]

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1. Oak Ridge, TN

Lead-iron phosphate glasses containing a high level of Fe.sub.2 O.sub.3 for use as a storage medium for high-level radioactive nuclear waste. By combining lead-iron phosphate glass with various types of simulated high-level nuclear waste, a highly corrosion resistant, homogeneous, easily processed glass can be formed. For corroding solutions at 90.degree. C., with solution pH values in the range between 5 and 9, the corrosion rate of the lead-iron phosphate nuclear waste glass is at least 10.sup.2 to 10.sup.3 times lower than the corrosion rate of a comparable borosilicate nuclear waste glass. The presence of Fe.sub.2 O.sub.3 in forming the lead-iron phosphate glass is critical. Lead-iron phosphate nuclear waste glass can be prepared at temperatures as low as 800.degree. C., since they exhibit very low melt viscosities in the 800.degree. to 1050.degree. C. temperature range. These waste-loaded glasses do not readily devitrify at temperatures as high as 550.degree. C. and are not adversely affected by large doses of gamma radiation in H.sub.2 O at 135.degree. C. The lead-iron phosphate waste glasses can be prepared with minimal modification of the technology developed for processing borosilicate glass nuclear wasteforms.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• Assignee: United States of America as represented by Department of Energy (Washington, DC)
• Patent Number(s): US 4847008
• OSTI ID: 867029
• Country of Publication: United States
• Language: English

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phosphate
glass
containment
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disposal
high-level
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waste
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glasses
containing
level
storage
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combining
various
types
simulated
highly
corrosion
resistant
homogeneous
easily
processed
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corroding
solutions
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borosilicate
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800
exhibit
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1050
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550
adversely
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gamma
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135
minimal
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wasteforms
high-level radioactive
lead-iron phosphate
iron phosphate
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corrosion resistant
temperature range
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storage medium
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ph values
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phosphate waste
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