Process for producing acicular goethite particles and acicular m

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

1994-09-21

1996-01-02

Bonner, C. Melissa

Compositions

Magnetic

Iron-oxygen compound containing

423632, 423633, C01G 4906, C01G 4908

Patent

active

054805716

ABSTRACT:
Disclosed herein are a process for producing acicular goethite particles comprising the step off: 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:
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patent: 4136049 (1979-01-01), Horishi et al.
patent: 4136158 (1979-01-01), Okuda et al.
patent: 4188302 (1980-02-01), Becker et al.
patent: 4495164 (1985-01-01), Okuda et al.
patent: 4873010 (1989-10-01), Takedoi et al.
patent: 5314750 (1994-05-01), Takedoi et al.
Patent Abstracts of Japan, & JP -A-60 021 307 (Nippon Soda) Feb. 2, 1985.
Patent Abstracts of Japan, & JP-A-22 93 330 (Ishihara Kaisha) Apr. 12, 1990.

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