Agglomerated ferromagnetic iron particles

Details Agglomerated ferromagnetic iron particles Agglomerated ferromagnetic iron particles

H - Electricity

01

F

31/121, 75/155,

H01F 1/06 (2006.01) B22F 1/00 (2006.01) G11B 5/706 (2006.01)

Patent

CA 1168430

Agglomerated ferromagnetic iron particles ABSTRACT OF THE DISCLOSURE Spherical agglomerates of surface-stabilized primary particles substantially consisting of iron, having a BET surface of about 5 to 50 m2/g, measured on the agglomerate, in non-pyrophoric form and having a bulk density of about 0.5 to 2.0 kg/l and an agglomerate diameter of about 0.5 to 10 mm are produced by a) reducing in dry phase particles consisting essentially of iron oxide, b) intensively dispersing the particles in liquid phase, c) coating the particles with an inorganic and/or organic coating optionally containing corrosion inhibitors, d) separating the particles from the liquid phase by evaporating the volatile components with a continuously rotating and simultaneously tumbling movement, and e) subjecting the resulting granulates to a thermal treatment. The particles are especially useful for the production of magnetic recording media. Le A 20 724

392568

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