Sequential Separation of Carbonate and Siliceous Gangue Minerals During Phosphate Ore Processing

  • I. Anazia
  • John Hanna


A unique fatty acid flotation process is described for sequential separation of carbonate and siliceous gangue minerals from low grade phosphate ores. The process involves a first stage of selective carbonate/phosphate separation followed by phosphate/silica separation during the second stage. In the first stage, a carbonate rich froth is removed without specific depression of the phosphate minerals and without conditioning of the pulp with the fatty acid collector prior to flotation. In the second stage, the same collector was selectively used to produce a market grade phosphate concentrate in the froth, in the presence or absence of a silica depressant. Selectivity was achieved using commercial grade fatty acid collectors, frothers and pH modifiers. The factors affecting carbonate/phosphate and phosphate/silica separation are discussed. Tests on a high-MgO siliceous phosphate matrix from south Florida, yielded phosphate concentrates analyzing 31% P2O5, 0.7% MgO and 4% acid insoluble matter with a P2O5 recovery of 80%.


Sodium Silicate Carbonate Froth Sequential Separation Collector Dose Collector Addition 
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  1. 1.
    I.J. Anazia and J. Hanna, Min. and Metall. Proc., pp. 196–202, (November, 1987 ).Google Scholar
  2. 2.
    I.J. Anazia and J. Hanna Int’l J. Mineral Processing 23, pp. 311314, (1988).Google Scholar
  3. 3.
    J. Hanna and I.J. Anazia, “Carbonate/Phosphate Flotation Separation by the MRI No-Conditioning Process”, 118th AIME/SME National Meeting, Las Vegas, Nevada, Feb. 27-March 2, 1989, Preprint #89–144.Google Scholar
  4. 4.
    J. Hanna, et al., “Process for Separating Carbonate and Non-Carbonate Salt-Type Minerals”, U.S. Patent pending Serial No. 07/395,996, August 21, 1989.Google Scholar
  5. 5.
    G.H. McClellan and J.R. Lehr, American Mineralogists 54, pp. 1374–1391, (1969).Google Scholar
  6. 6.
    N.S. Schulz, Trans. SME/AIME 247, pp. 81–87, (1970).Google Scholar
  7. 7.
    B.M. Moudgil and P. Sumasundaran: Advances in Mineral Processing, P. Sumasundaran, ed. (AIME/SME), pp. 426–441, (1986).Google Scholar
  8. 8.
    M. Bertolucci, F. Jantzef, and D.L. Chamberlain, Interaction of Liquids at Solid Substrates, R.F. Gould, ed. (ACS ), Advances in Chemistry Series, Washington, D.C., 1968, pp. 124–132.CrossRefGoogle Scholar
  9. 9.
    D.J. Johnston and J. Leja, Trans., Canad. Inst. of Min. and Metall. 87, pp. 237–242, (1978).Google Scholar
  10. 10.
    V.I. Klassen and V.A. Mokrousov, An Introduction to the Theory of Flotation, J. Leja and G.W. Poling eds., ( London, Butterworths, 1963 ) pp. 321–335.Google Scholar
  11. 11.
    M.A. Eigeles, “Theoretical Basis of the Flotation of Non-Sulfide Minerals”, Metallurgizdat, (1950).Google Scholar
  12. 12.
    N.A. Ianis, “The Effect of Alkali Regulators on the Adsorption of Sodium Silicate by Calcium Minerals”, Proc. 2nd Sci Tech. Sess, Metallurgizdat, 1952.Google Scholar

Copyright information

© Elsevier Science Publishing Co., Inc. 1990

Authors and Affiliations

  • I. Anazia
    • 1
  • John Hanna
    • 1
  1. 1.Mineral Resources InstituteThe University of AlabamaTuscaloosaUSA

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