Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Low sintering temperature glass waste forms for sequestering radioactive iodine

Patent ·
OSTI ID:1078337
; ; ;

Materials and methods of making low-sintering-temperature glass waste forms that sequester radioactive iodine in a strong and durable structure. First, the iodine is captured by an adsorbant, which forms an iodine-loaded material, e.g., AgI, AgI-zeolite, AgI-mordenite, Ag-silica aerogel, ZnI.sub.2, CuI, or Bi.sub.5O.sub.7I. Next, particles of the iodine-loaded material are mixed with powdered frits of low-sintering-temperature glasses (comprising various oxides of Si, B, Bi, Pb, and Zn), and then sintered at a relatively low temperature, ranging from 425.degree. C. to 550.degree. C. The sintering converts the mixed powders into a solid block of a glassy waste form, having low iodine leaching rates. The vitrified glassy waste form can contain as much as 60 wt % AgI. A preferred glass, having a sintering temperature of 500.degree. C. (below the silver iodide sublimation temperature of 500.degree. C.) was identified that contains oxides of boron, bismuth, and zinc, while containing essentially no lead or silicon.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC04-94AL85000
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Number(s):
8,262,950
Application Number:
12/727,353
OSTI ID:
1078337
Country of Publication:
United States
Language:
English

References (8)

Some phase relationships between basic bismuth chlorides in aqueous solutions at 25 °C journal December 1987
The crystal structure of Bi4O5I2 and its relation to the structure of Bi4O5Br2 journal January 2002
Applicability of V 2 O 5 -P 2 O 5 Glass System for Low-Temperature Vitrification journal January 1996
In-situ Formation of Bismuth-Based Iodine Waste Forms journal January 2007
Ceramic Wasteforms for the Conditioning of Spent MO x Fuel Wastes journal January 2003
Immobilization of Radioactive Iodine Using AgI Vitrification Technique for the TRU Wastes Disposal: Evaluation of Leaching and Surface Properties journal January 2008
Silver Zeolites: Iodide Occlusion and conversion to Sodalite – a potential 129 I waste form? journal January 2006
The crystal structure of α-Bi5O7I journal January 2001

Similar Records

Development of iodine waste forms using low-temperature sintering glass.
Conference · Tue Jun 01 00:00:00 EDT 2010 · OSTI ID:1021093
Optimization of sintered AgI-Mordenite composites for {sup 129}I storage
Conference · Mon Jul 01 00:00:00 EDT 2013 · OSTI ID:22264227
Determine Minimum Silver Flake Addition to GCM for Iodine Loaded AgZ
Technical Report · Tue Apr 01 00:00:00 EDT 2014 · OSTI ID:1163297

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY