Process for producing acicular geothite particles and acicular m

Details Process for producing acicular geothite particles and acicular m Process for producing acicular geothite particles and acicular m

1993-02-25

1995-01-03

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6262, 423632, 423633, 423634, 427127, 427128, C01G 4906, C01G 4908

Patent

active

053783808

ABSTRACT:
Disclosed herein are a process for producing acicular goethite particles comprising the step of: blowing an oxygen-containing gas into a ferrous salt reaction solution containing colloidal ferrous hydroxide or iron-containing colloidal precipitates which is obtained by reacting an aqueous ferrous salt solution with less than one equivalent of an aqueous alkali hydroxide solution, an aqueous alkali carbonate solution, or an aqueous alkali hydroxide and alkali carbonate solution based on Fe.sup.2+ in said aqueous ferrous salt solution, in the presence of ascorbic acid or a salt thereof so as to oxidize said colloidal ferrous hydroxide or iron-containing colloidal precipitates and to produce acicular goethite particles throught green rust; and a process for producing acicular magnetic iron oxide particles by reducing the acicular goethite particles obtained in the above process to produce acicular magnetite particles, and if necessary, oxidizing the acicular magnetite particles to obtain acicular maghemite particles, and if necessary, modifying the acicular magnetite or maghemite particles with Co or Co and Fe.sup.2+.

REFERENCES:
patent: 3946103 (1976-03-01), Hund
patent: 4033891 (1977-07-01), Matsui et al.
patent: 4136049 (1979-01-01), Horishi et al.
patent: 4136158 (1979-01-01), Okuda et al.
patent: 4495164 (1985-01-01), Okuda et al.
patent: 4873010 (1989-10-01), Takedoi et al.

Affiliated with

Also associated with

Rating

Process for producing acicular geothite particles and acicular m does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing acicular geothite particles and acicular m, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing acicular geothite particles and acicular m will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2209234