Mechanism for Elevated Temperature Leaching
Long-term, elevated temperature leaching and subsequent electron microprobe analysis of simulated waste glass and ceramic materials have been completed. A cyclic leaching pattern was found in all systems over a 20-month period. It appears that the leaching of mobile ions by simple diffusional processes is modified by more complex chemical interactions. The release of immobile ions is primarily a function of their chemical interactions in the matrix which suggests that these ions may be complex species when released into solution. A mechanism is proposed which incorporates these ideas and the cyclic phenomenon observed.
KeywordsElectron Microprobe Ceramic Sample Waste Form Immobile Element Nuclear Waste Management
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- 2.J. E. Mendel, A Review of Leaching Test Methods and the Leachability of Various Solid Media Containing Radioactive Waste, USDOE Rept. BNWL-1765, Battelle Pacific Northwest Labs, Richland, WA, 44 (1973).Google Scholar
- 3.Report BNWL-1841, 29, Table VIII, Battelle Northwest Laboratories, Richland, WA, (1974).Google Scholar
- 4.R. G. Dosch, “Ceramic Forms for Nuclear Waste,” Radioactive Waste in Geologic Storage (S. Fried, ed., ACS Symposium Series 100, 1979 )Google Scholar
- 5.B. T. Kenna, K. D. Murphy and H. S. Levine, “Long-Term Elevated Leaching of Solid Waste Forms,” Scientific Basis for Nuclear Waste Management 1 (G. J. McCarthy, ed., Plenum Press, NY, 157, 1979 ).Google Scholar
- 6.K. Scheffler, U. Riege, K. Louwrier, Hf. Matzke, I. Ray and H. Thiele, Long Term Leaching of Silicate Systems: Testing Procedure, Actinides Behavior and Mechanism, EUR-5509e, Kernfurschugezentrum Karlruhe, Germany, 60 (1977).Google Scholar
- 7.H. Born, The Mechanism of Dissolution of Silica in HC1-HF Mixtures, PhD Thesis, University of Texas, Austin, TX (1976).Google Scholar
- 8.M.N. Elliot and D. B. Auty, “The Durability of Glass for the Disposal of Highly Radioactive Waste,” Glass Tech. 9, 5 (1968).Google Scholar