Process for preparing precipitated red iron oxides

Details Process for preparing precipitated red iron oxides Process for preparing precipitated red iron oxides

1979-05-03

1981-03-17

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

106304, C01G 4906

Patent

active

042567238

ABSTRACT:
A precipitated red iron oxide, having high crystallinity, low acicularity, unifrom particle size, and purity of color, is produced by aerating an alkaline mixture of copperas and soda ash to form seed crystals, increasing the temperature, adding additional copperas, and aerating the mixture to form red oxide crystals of the desired color. The final color can vary from a light salmon to a dark maroon.

REFERENCES:
patent: 2574459 (1951-11-01), Bennetch
patent: 2939767 (1960-06-01), Martin
patent: 3845198 (1974-10-01), Marcot
patent: 3946103 (1976-03-01), Hund
patent: 3974267 (1976-08-01), Urban
patent: 4060596 (1977-11-01), Nakamura

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