Magnetite particles and process for production thereof

Details Magnetite particles and process for production thereof Magnetite particles and process for production thereof

1998-12-21

2000-05-09

Koslow, C. Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6251, 252 6259, 252 626, 252 6262, 252 6264, C01G 4908, G03G 9083, H01R 111

Patent

active

06059988&

ABSTRACT:
Magnetite particles continuously contain a total amount of 0.2 to 1.2 wt. %, based on magnetite, of a silicon component and an aluminum component expressed as silicon and aluminum, in a region ranging from the center to the surface of the particle, a total amount of 0.01 to 0.5 wt. % of the silicon component and the aluminum component, expressed as silicon and aluminum, being exposed on the surface of the particle, and an outer shell of the particle being coated with a metal compound comprising at least one metal component bound to the silicon component and the aluminum component, the metal component being selected from the group consisting of Zn, Mn, Cu, Ni, Co, Cr, Cd, Zr, Sn, Mg, Ti, Ce, W and Mo and a process for their preparation.

REFERENCES:
patent: 6013193 (2000-01-01), Hashiuchi et al.
Patent Abstracts of Japan, Publication #58060753, Publication date: Nov. 4, 1983.

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