Production method of goethite

Details Production method of goethite Production method of goethite

1991-01-04

1992-08-18

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423632, 252 6256, 252 626, 252 6262, C01G 4906

Patent

active

051397676

ABSTRACT:
A method for producing goethite having an axial ratio of at least 7 and a specific surface area of 20-80 m.sup.2 /g and suitable for use in the production of .alpha.-iron powder, which method comprises intermittently feeding an oxidizing gas into a suspension of ferrous hydroxide, which has been obtained by reacting a ferrous salt with an alkali hydroxide, preferably while controlling the oxidation rate of ferrous hydroxide below 7% per each feeding-feed-stopping cycle of the oxidizing gas and also controlling the feeding time period of the oxidizing gas within 10 minutes and shorter than a quarter of the feed-stopping time period per each feeding-feed-stopping cycle of the oxidizing gas.

REFERENCES:
patent: 3743707 (1973-07-01), Iwase et al.
patent: 4060596 (1977-11-01), Nakamura
patent: 4061726 (1977-12-01), Ohlinger et al.
patent: 4112063 (1978-09-01), Buxbaum et al.
patent: 4376714 (1983-03-01), Pingaud

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