Method for producing yellow hydrated ferric oxide

Details Method for producing yellow hydrated ferric oxide Method for producing yellow hydrated ferric oxide

1975-09-09

1978-02-14

Vertiz, O. R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4902

Patent

active

040738787

ABSTRACT:
Yellow hydrated ferric oxide having uniform and proper particle size can be economically produced by the present invention which comprises allowing an ammonium salt to be present in a given concentration in a ferrous salt solution, partially neutralizing the mixed solution with ammonia, oxidizing it with air to obtain a seed liquid, adding a ferrous salt solution to said seed liquid and simultaneously adding ammonia thereto to attain a suitable pH value and oxidizing the ferrous salt with air at said pH whereby a uniform particle size can be rapidly obtained.

REFERENCES:
patent: 3845198 (1974-10-01), Marcot
patent: 3970738 (1976-07-01), Matsui et al.

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