Study on Chemical Durability of Phosphate Glass Wasteform
Washington state in the United States to Hanford City store different components of the 17 categories of highly radioactive nuclear waste (high level radioactive nuclear waste, HLW) for the study, design containing Cr2O3 4% (mass fraction) simulation HLW. by 25% to 35% of phosphate and Cr2O3 65% to 75% of the HLW simulation of mixed composition, the 1150 ~ 1250 ℃ heat treatment a few hours, can become homogeneous vitreous melt, and then cooled to a HLW . solid sample used (product consistency test, the PCT) test inclusive 70% and 75% of the two kinds of glass HLW curing the various elements of the 90 ℃ for 7 d, elemental Lek out of the total were less than 1.5 g / m2 and 2.0 g/m2. steam hydration erosion (vapor hydration test, VHT) has two kinds of samples at 200 ℃ for the water vapor hydration erosion, 7 d after treatment, the average erosion rate were small at 0.2 g / (m2 d) and 3.5 g / (m2 d). after crystallization of the two kinds of sample test results PCT and VHT crystallization and basically similar. HLW different packages of the capacity of curing glass Infrared spectra indicate that the body: in the higher-capacity glass HLW curing of the structure, easily hydration (PO3) - into a separate structure (P2O7) 4 - or (PO4) 3-.X - ray diffraction analysis showed that: glass separated HLW (P2O7) 4 - and (PO 4) 3 - Mission was anionic metal ions Al3 +, Fe3 +, Cr3 + and Zr4 + connected to form OP-Me-O bond, not only improve the crystallization of glass capacity, but also greatly enhance its chemical stability. samples O / (Si + P) molar ratio of 3.7 to 4.1, the structure of the nuclear waste packages also shows that up to 70 percent capacity ~ 75% of the glass HLW good chemical stability.
W. Huang et al., "Study on Chemical Durability of Phosphate Glass Wasteform," Chinese Journal of Silicates, Zhongguo jian zhu gong ye chu ban she, Jan 2004.
Materials Science and Engineering
Keywords and Phrases
Phosphate Glass; X-Ray Diffraction Analysis; Chemical Stability; Infrared; Nuclear Waste Disposal
Article - Journal
© 2004 Zhongguo jian zhu gong ye chu ban she, All rights reserved.