Production of magnetic iron oxides

Details Production of magnetic iron oxides Production of magnetic iron oxides

1981-07-23

1982-11-09

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

106304, 423633, 423634, C01G 4908

Patent

active

043584314

ABSTRACT:
In the production of needle-shaped magnetic iron oxide pigments by treating iron with a nitro-aromatic in the presence of .alpha.-FeOOH nuclei to form .alpha.-FeOOH particles and an amino-aromatic, and thereafter dehydrating the .alpha.-FeOOH particles and reducing them, the improvement which comprises forming the .alpha.-FeOOH nuclei at about 0.degree. to 90.degree. C. in a suspension of metallic iron, an iron-(II)-salt and a nitro-aromatic by adding a basic precipitant in about 10 to 95% of the amount required for the complete precipitation of the iron in the iron-(II)-salt. Advantageously the metallic iron comprises cast iron, the nitro-aromatic comprises nitrobenzene, the amino-aromatic comprises aniline, the basic precipitant comprises at least one of ammonia and a basically reacting alkali metal, alkaline earth metal or ammonium salt, the nuclei formation is carried out at about 10.degree. to 60.degree. C., and the basic precipitant is added in about 20 to 80% of the amount required for the complete precipitation of the iron in the iron-(II)-salt, additional iron and nitrobenzene being added to the suspension of precipitated nuclei to form the .alpha.-FeOOH particles.

REFERENCES:
patent: 3015627 (1962-01-01), Ayers et al.
patent: 4234348 (1980-11-01), Brunn et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-745560