Fine powder classification by ferrofluid density separation

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

1975-01-29

1976-04-20

Lutter, Frank W.

Classifying, separating, and assorting solids

Miscellaneous

B03B 1304

Patent

active

039517845

ABSTRACT:
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 angstroms. Perfluorinated carriers and surfactants are preferred for their relatively high intrinsic density.

REFERENCES:
patent: 3483968 (1969-12-01), Kaiser
patent: 3784471 (1974-01-01), Kaiser
patent: 3843540 (1974-10-01), Reimers et al.
kaiser et al., "Magnetic Properties of Stable Dispersions of Subdomain Magnetite Particles," Journal of Applied Physics, Vol. 41, No. 3, pp. 1064-1072.

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