Selective Deslimings of Fine Iron Ores Based on Aggregation Between Magnetite and Hematite

  • Qun Xu
  • M. J. Zhang
  • J. K. Lou
  • P. Somasundaran


Hematite fines were found to form aggregates with magnetite particles in the same slurry, without the help of any flocculants. Because of this aggregation, fine iron ores containing hematite and magnetite can be successfully concentrated by multi-stage deslimings, provided that the ore is finely ground and silicate gangues properly dispersed. The effectiveness of this technique has been tested on a commercial scale(100 ton/h). The increased magnetic attraction between magnetite and hematite due to the terrestrial magnetization of magnetite and its size effect are revealed as responsible for the aggregation, considering the fact that the hematite-magnetite system is already in relatively week dispersion because of their low zeta potentials.


Sodium Silicate Magnetite Particle Pulp Density Ferrite Powder Terrestrial Magnetization 


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Copyright information

© Elsevier Science Publishing Co., Inc. 1990

Authors and Affiliations

  • Qun Xu
    • 1
  • M. J. Zhang
  • J. K. Lou
    • 2
  • P. Somasundaran
    • 1
  1. 1.Langmuir Center for Colloid and Interlaces, Henry Krumb School of MinesColumbia UniversityNew YorkUSA
  2. 2.Beijing General Research Institute of Mining & MetallurgyBeijingP.R. China

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