Journal of Materials Science

, Volume 14, Issue 12, pp 2797–2810 | Cite as

Reaction of chlorapatite, Ca5(PO4)3(Cl, F) with sodium carbonate and silica

  • R. P. Gunawardane
  • F. P. Glasser
Papers
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Accepted:

Abstract

The conversion of insoluble phosphorous minerals such as apatite, Ca5(PO4)3(F, OH, Cl), to phases containing phosphorous in soluble form is an essential step in the production of fertilizer grade phosphates. Developing countries lack the capital-intensive industrial base necessary to create a phosphate industry. We examine a process suitable for use in Sri Lanka which uses mainly indigenous raw materials. In this process, a chlorine-rich apatite is fused with Na2CO3 and SiO2 at 900° C and 1300° C for 1 to 2 h to yield a product having >90% available phosphorous. Data necessary for the technological evaluation of the process are presented. Phase equilibria in the lime-rich portions of the system CaO-Na2O-P2O5-SiO2 have been studied. The section Ca3(PO4)2-Ca2SiO4-CaNaPO4 is shown to be a ternary system, and phase relations on the 1100° and 1300° C isothermal sections are presented. A reconnaisance of the system CaO-Ca3(PO4)2-Ca2SiO4-CaNaPO4 has been made. These data, combined with studies of the kinetics of the reaction, point to regions of composition and reaction conditions favouring high yields of available phosphorous.

Keywords

Polymer SiO2 Apatite Phase Equilibrium Ternary System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. 1.
    J. W. Mellor, “Comprehensive treatise on Inorganic and theoretical Chemistry”, Vol. 3, Supplement 3 (Longmans, London, 1971).Google Scholar
  2. 2.
    F. Ullmann, “Encyklopadie der Technischen Chemie” Vol. 6 (Urban and Schwarzenberg, Munchen, Berlin, Wien, 1955).Google Scholar
  3. 3.
    D. E. C. Corbridge, “The Structural Chemistry of Phosphorous” (Elsevier Scientific Publishing Company, Amsterdam, London, New York, 1974).Google Scholar
  4. 4.
    G. Pannetier andM. Gaultier,Bull. Soc. Chem. France (1966) 188.Google Scholar
  5. 5.
    M. A. Bredig,J. Phys. Chem. 46 (1942) 747.Google Scholar
  6. 6.
    W. Eisel andT. Hahn,Z. Krist. 131 (1970) 322.Google Scholar
  7. 7.
    B. Dickens, L. W. Schroeder andW. E. Brown,J. Solid State Chem. 10 (1974) 232.Google Scholar
  8. 8.
    M. Gaultier andG. Pannetier,Bull. Soc. Chem. France (1968) 105.Google Scholar
  9. 9.
    B. Dickens andW. E. Brown,Tschermaks Mineral. Petrog. Mitt. 16 (1971) 1.Google Scholar
  10. 10.
    D. K. Smith, A. Majumdar andF. Ordway,Acta. Cryst. 18 (1965) 787.Google Scholar
  11. 11.
    M. Regourd, M. Bigare, J. Forest andA. Guinier, Proceedings of the Fifth International Symposium on the Chemistry of Cement, Tokyo (The Cement Association of Japan, 1968) p. 44.Google Scholar
  12. 12.
    C. M. Midgley,Acta Cryst. 5 (1952) 307.Google Scholar
  13. 13.
    B. Dickens, E. E. Brown, G. J. Kruger andJ. M. Stewarts,Acta Cryst. B29 (1973) 2046.Google Scholar
  14. 14.
    J. Ando andS. Matsuno,Bull. Chem. Soc. Japan 41 (1968) 342.Google Scholar
  15. 15.
    J. Berak andT. Znamierowska,Rocziniki Chem. 41 (1967) 2065.Google Scholar
  16. 16.
    R. W. Nurse, J. H. Welch andW. Gutt,J. Chem. Soc. (1959) 1078.Google Scholar
  17. 17.
    W. F. H. Heymann andR. Heinke,J. Amer. Ceram. Soc. 52 (1969) 346.Google Scholar
  18. 18.
    I. Kapralik andF. Hanic,Trans. J. Brit. Ceram. Soc. 76 (1977) 126.Google Scholar
  19. 19.
    V. M. Ust'yantsev andM. G. Tretnikova,Izv. Akad. Nauk SSSR, Neorg. Mater. 13 (1977) 865.Google Scholar
  20. 20.
    W. H. Pierre andA. G. Norman, “Soil and Fertilizer Phosphorous in Crop Nutrition” (Academic Press, London, New York, 1953).Google Scholar
  21. 21.
    P. G. Jeffery, “Chemical Methods of Rock Analysis”, (Pergamon Press, Oxford, 1970).Google Scholar
  22. 22.
    C. R. Edmond,Anal. Chem. 41 (1969) 1327.Google Scholar

Copyright information

© Chapman and Hall Ltd 1979

Authors and Affiliations

  • R. P. Gunawardane
    • 1
  • F. P. Glasser
    • 1
  1. 1.Department of ChemistryUniversity of AberdeenOld AberdeenScotland

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