Magnetic separation to improve purity of iron oxide pigments

Details Magnetic separation to improve purity of iron oxide pigments Magnetic separation to improve purity of iron oxide pigments

1981-05-29

1983-03-29

McCarthy, Helen M.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

209 39, 209232, 423633, C09C 124

Patent

active

043782523

ABSTRACT:
A process for increasing the color purity of iron oxide pigment particles admixed with color-modifying impurities and obtained by the Penniman process or the aniline process, comprising introducing the particles into a magnetic field, and removing from the magnetic field two fractions of different magnetizability, the first fraction being iron oxide pigment particles of increased color purity and the second fraction being enriched in impurities.

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Sproull, R. L., Modern Physics, pub. by Wiley and Sons, NYC (1965), pp. 322-333.
Gupta, A. et al, "A New Method of Magnetic Separation of Ferro- and Para- Magnetic Minerals From Feebly Magnetic and Non-Magnetic Minerals", Proc., Australas. Inst. Min. Metall., Jun. 1980, (274), pp. 23-35.

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