Production of acicular magnetic iron oxides

Details Production of acicular magnetic iron oxides Production of acicular magnetic iron oxides

1977-11-01

1979-01-23

Vertiz, O. R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423633, 423634, C01G 4902

Patent

active

041361580

ABSTRACT:
In the production of acicular ferromagnetic iron oxide of highly uniform particle size by oxidizing an iron (II) hydroxide suspension at a pH of at least 11 with an oxygen-containing gas to form acicular iron (III) oxide hydroxide, reducing and optionally further reoxidizing this into ferromagnetic iron oxide, the improvement which comprises providing the iron (II) hydroxide suspension with a water-soluble silicate in an amount of less than 1.7% by atom based on the amount of the iron (II) hydroxide in the suspension and calculated as the ratio of Si to Fe (II) while prior to the oxidation of the suspension with the oxygen-containing gas.

REFERENCES:
patent: 3912646 (1975-10-01), Leitner et al.
patent: 3931025 (1976-01-01), Woditsch et al.
patent: 3947502 (1976-03-01), Leitner et al.
patent: 3956005 (1976-05-01), Sugahara et al.
patent: 3974079 (1976-08-01), Woditsch et al.

Affiliated with

Also associated with

Rating

Production of acicular magnetic iron oxides does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Production of acicular magnetic iron oxides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production of acicular magnetic iron oxides will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2273255