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Low sintering temperature glass waste forms for sequestering radioactive iodine

United States Patent

September 11, 2012
View the Complete Patent at the US Patent & Trademark Office
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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 C. to 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 C. (below the silver iodide sublimation temperature of C.) was identified that contains oxides of boron, bismuth, and zinc, while containing essentially no lead or silicon.
Nenoff; Tina M. (Sandia Park, NM), Krumhansl; James L. (Albuquerque, NM), Garino; Terry J. (Albuquerque, NM), Ockwig; Nathan W. (Spicer, NM)
Sandia Corporation (Albuquerque, NM)
12/ 727,353
March 19, 2010
FEDERALLY SPONSORED RESEARCH The United States Government has rights in this invention pursuant to Department of Energy Contract No. DE-AC04-94AL85000 with Sandia Corporation.