Process for producing acicular iron .alpha.-oxyhydroxide particl

Details Process for producing acicular iron .alpha.-oxyhydroxide particl Process for producing acicular iron .alpha.-oxyhydroxide particl

1987-11-12

1989-02-21

Stoll, Robert L.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423633, 423634, C01G 4502

Patent

active

048063355

ABSTRACT:
A process for producing acicular .alpha.-FeOOH particle powder having a narrow particle size distribution and a rectified shape and being highly dispersed is provided, which process comprises mixing with stirring an aqueous solution of a Fe(II) salt with an aqueous solution of an alkali in an equivalent ratio of alkali to Fe(II) salt of 1.5 or more, oxidizing the mixture with a O.sub.2 -containing gas, heat treating the resulting suspension of iron .alpha.-FeOOH particle powder to 60.degree. to 100.degree. C., further adding an aqueous solution of a FE(II) salt in a proportion of atom to molecule of Fe(II)/.alpha.-FeOOH of 0.5 to 10% and again oxidizing the mixture with a O.sub.2 -containing gas at 35.degree. to 55.degree. C.

REFERENCES:
patent: 4073878 (1978-02-01), Otsuki et al.
patent: 4597958 (1986-07-01), Takagi et al.
The Elements of Chemistry, No. 9, 1985, Edited by Japan Chemical Society, "Inorganic Reactions Related to Solids", p. 72.

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