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Clays and Clay Minerals

, Volume 50, Issue 2, pp 248–253 | Cite as

A microwave-assisted method for the rapid removal of K from phlogopite

  • Stephen A. Stout
  • Sridhar KomarneniEmail author
Article

Abstract

The ability to remove K rapidly with a solution containing sodium tetraphenylborate (NaTPB) from the interlayers of naturally-occurring phlogopite using a microwave-assisted technique has been examined. Samples were equilibrated with a 1.0 N sodium chloride (NaCl) — 0.2 N NaTPB — 0.01 M disodium ethylenediaminetetraacetic acid (EDTA) solution at 60, 80 and 100°C under both conventional and microwave-assisted heating methods and for periods of time ranging from 1 to 3 h. The samples also underwent treatments of either continuous time periods or for successive treatments of 1 h with a washing step between each treatment.

Following sample treatment, the expansion of the c-axis value (d001) from 10.0 to 12.2 Å indicated the presence of hydrated Na ions in the phlogopite structure. Under most treatment conditions the 10.0 Å peak remained even after treatment due to incomplete K removal. Chemical analysis and X-ray diffraction (XRD) revealed that samples heated using microwave radiation exchanged their interlayer K for Na much more rapidly than under conventional heating for all treatment times and temperatures. The successive treatments also degraded the mica more rapidly than the continuous treatments. The greatest amount of K (95%) was removed when the mica was treated three times for 1 h at 60°C. The results suggest that successive treatments of phlogopite mica heated under microwave radiation will rapidly remove K from the mica. Decreasing the amount of time required to prepare K-depleted phlogopite micas will make these materials more appealing as ion exchangers for separation of Cs from nuclear wastes.

Key Words

Ion Exchange K-depleted Phlogopite Mica Microwave Radioactive Waste Disposal 

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References

  1. Amphlett, G.B., McDonald, L.A. and Redman, M.J. (1958) Synthetic ion exchange materials: I. Zirconium phosphate. Journal of Inorganic and Nuclear Chemistry, 6, 220–235.CrossRefGoogle Scholar
  2. Bortun, A.I., Bortun, L.N., Khainakov, S.A. and Clearfield, A. (1998) Ion exchange properties of the sodium phlogopite and biotite. Solvent Extraction and Ion Exchange, 16, 1067–1090.CrossRefGoogle Scholar
  3. Bracke, G., Satir, M. and Krauß, P. (1995) The cryptand [222] for exchanging cations of micas. Clays and Clay Minerals, 43, 732–737.CrossRefGoogle Scholar
  4. Cundy, C.S. (1998) Microwave techniques in the synthesis and modification of zeolite catalysts. A review. Collection of Czechoslovak Chemical Communications, 63, 1699–1723.CrossRefGoogle Scholar
  5. Johnson, J. (1999) DOE needs new waste separation technology. Chemical & Engineering News, 23, 8.Google Scholar
  6. Komarneni, S. (1985) Phillipsite in Cs decontamination and immobilization. Clays and Clay Minerals, 33, 145–151.CrossRefGoogle Scholar
  7. Komarneni, S. and Roy, R. (1982a) Use of γ-zirconium phosphate for Cs removal from radioactive waste. Nature, 299, 707–708.CrossRefGoogle Scholar
  8. Komarneni, S. and Roy, R. (1982b) Alternative radwaste solidification route for Three Mile Island wastes. Journal of the American Ceramic Society, 65, c–198.CrossRefGoogle Scholar
  9. Komarneni, S. and Roy, R. (1988) A cesium-selective ion sieve made by topotactic leaching of phlogopite mica. Science, 239, 1286–1288.CrossRefGoogle Scholar
  10. Komarneni, S., Roy, R. and Li, Q.H. (1992) Microwave-hydrothermal synthesis of ceramic powders. Materials Research Bulletin, 27, 1393–1405.CrossRefGoogle Scholar
  11. Mercer, B.W. and Ames, L.L. (1978) Zeolite ion exchange in radioactive and municipal waste treatment. Pp. 451–462 in: Natural Zeolites: Occurrence, Properties, Use (L.B. Sand and F.A. Mumpton, editors). Pergamon Press, New York.Google Scholar
  12. Neas, E.D. and Collins, M.J. (1988) Microwave heating, theoretical concepts and equipment design. Pp. 7–32 in: Introduction to Microwave Sample Preparation, Theory and Practices (H.M. Kingston and L.B. Jassie, editors). American Chemical Society, Washington, D.C.Google Scholar
  13. Nelson, J.L. and Mercer, B.W. (1963) Ion exchange separation of cesium from alkaline waste supernatant solutions. US Atomic Energy Commission Doc. No. HW-76449.Google Scholar
  14. Ponder, S.M. and Mallouk, T.E. (1999) Recovery of ammonium and cesium from aqueous waste streams by sodium tetraphenylborate. Industrial & Engineering Chemistry Research, 38, 4007–4010.CrossRefGoogle Scholar
  15. Reed, MG. and Scott, AD. (1966) Chemical extraction of potassium from soils and micaceous minerals with solutions containing sodium tetraphenylboron: IV. Muscovite. Soil Science Society of America Proceedings, 30, 185–188.CrossRefGoogle Scholar
  16. Scott, A.D. and Reed, M.G. (1962a) Chemical extraction of potassium from soils and micaceous minerals with solutions containing sodium tetraphenylboron: II. Biotite. Soil Science Society of America Proceedings, 26, 41–45.CrossRefGoogle Scholar
  17. Scott, A.D. and Reed, M.G. (1962b) Chemical extraction of potassium from soils and micaceous minerals with solutions containing sodium tetraphenylboron: III. Illite. Soil Science Society of America Proceedings, 26, 45–48.CrossRefGoogle Scholar
  18. Scott, A.D. and Smith, S.J. (1966) Susceptibility of interlayer potassium in micas to exchange with sodium. Clays and Clay Minerals, 14, 69–81.CrossRefGoogle Scholar
  19. Smith, S.J. and Scott, A.D. (1966) Extractable potassium in Grundite illite, I. Method of extraction. Soil Science, 102, 115–122.CrossRefGoogle Scholar
  20. Scott, A.D., Hunziker, R.R. and Hanway, J.J. (1960) Chemical extraction of potassium from soils and micaceous minerals with solutions containing sodium tetraphenylboron. I. Preliminary experiments. Soil Science Society of America Proceedings, 24, 191–194.CrossRefGoogle Scholar
  21. Srikanth, V., Roy, R. and Komarneni, S. (1992) Acoustic-wave stimulation of the leaching of layer silicates. Materials Letters, 15, 127–129.CrossRefGoogle Scholar
  22. Vaidhyanathan, B. and Rao, K.J. (1996) Rapid microwave assisted synthesis of hydroxyapatite. Bulletin of Materials Science, 19, 1163–1165.CrossRefGoogle Scholar

Copyright information

© The Clay Minerals Society 2002

Authors and Affiliations

  1. 1.Department of Crop and Soil Sciences and Materials Research InstituteThe Pennsylvania State UniversityUniversity ParkUSA

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