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Iodine Immobilization by Sodalite Waste Form

  • T. Nakazawa (a1), H. Kato (a1), K. Okada (a1), S. Ueta (a2) and M. Mihara (a3)...

Abstract

Leachabilities and solubilities of the synthesized iodide sodalite and natural (chloride) sodalite were measured by leach test. The iodide sodalite was synthesized in nitrogen gas flow at 800°C for 2 hours. The crystalline structure of the product was certified by XRD analysis. The natural sodalite containing chlorine was obtained at Bancroft, Canada. The several types of solution were used to evaluate the influence of the solubility of sodalite that included the varied pH and the chemical compositions. The solubilities of chloride sodalite were calculated by the thermodynamics data. The solubility measured for the synthesized iodide sodalite was compared with that calculated. The solubility of the synthesized iodide sodalite was approximately 2 x 10-4 mol/L, which shows a good agreement with the calculated one of the natural sodalite.

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1. Winters, W.I., “The Effect of Hot-Pressing Conditions on the Properties of Iodide Sodalite”, RHO-LD-153, 1980
2. Vance, E.R., Agrawal, D.K. et al., “Ceramic Phase for Immobilization of I-129”, DOE/ET/41900-9, 1981
3. Pereira, C., “Production of Sodalite Waste Forms by Addition of Glass”, ANL/CMT/CP-84675, 1995
4. Koyama, T., Seto, C., Yoshida, T., Kawamura, F., and Tanaka, H., “Immobilization of Halide Salt Waste from Pyrochemical Reprocessing by Forming Natural Occurring Mineral; SODALITE”, International Conference on Evaluation of Emerging Nuclear Fuel Cycle Systems, Global '95, pp.17441751, 1995
5. Nakazawa, T., Kato, H., Takase, T., Ueta, S., “Immobilization of Iodine by Sodalite Waste Form”, J.Nuclear Fuel Cycle and Environment, Vol.6, No.1, Dec 1999 (in Japanese)
6. Parkhurst, D.L., Thorstenson, D.C. and Plummer, L.N., PHREEQE. A Computer program for Geochemical Calculations., U.S.GEOLGICAL SURVEY, Water-Resource Investigations, 80-96, 1980
7. Komada, N., Westrum, E.F. Jr, Hemingway, B.S., Zolotov, M.Y., Semenov, Y.V., and Anovitz, L.M., “Thermodynamic Properties of Sodalite at Temperatures from 15K to 1000K”, J.Chem.Thermodynamics, 27, pp.11191132, 1995
8.Thermodynamic Table for Nuclear Waste Isolation, NUREG/CR-4865

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