Fine powder classification by ferrofluid density separation

Details Fine powder classification by ferrofluid density separation Fine powder classification by ferrofluid density separation

B - Operations, Transporting

03

B

209/16, 31/68

B03B 13/04 (2006.01) B03C 1/32 (2006.01)

Patent

CA 1074988

ABSTRACT OF THE DISCLOSURE A method of separating small diameter non-magnetic particles of different densities by using a low magnetic saturation ferrofluid and a high magnetic gradient to produce levitation by overcoming the magnetic attraction of the particles. Application of a constant gradient field of a level below the magnetic saturation level of the ferrofluid forms the ferrofluid into a density gradient column. Each non-magnetic particle levitates to the level inside the ferrofluid having the same apparent density as the particle. The ferrofluid contains magnetic particles with a mean effective core diameter less than about 50 angstroms and a stabilizing agent layer on the particle exceeding about 50 ang- stroms. Perfluorinated carriers and surfactants are preferred for their relatively high intrinsic density.

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