Process for making goethite

Details Process for making goethite Process for making goethite

1995-07-17

1997-06-24

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423633, 252 6256, C01G 4902

Patent

active

056414706

ABSTRACT:
This invention provides a method of producing goethite particles comprising the steps of
a) reacting, in aqueous solution, less than a stoichiometric amount of an alkali compound with an iron (II) salt to form a precipitated complex intermediate,
b) oxidizing iron (II) in the complex intermediate to iron (III) at an average rate less than 10 g iron(III)/l/hr to form goethite seed particles until 20 to 70% of iron (II) in the precipitated complex intermediate has been converted to iron (III), and
c) after 20 to 70% of iron (II) in the precipitated complex intermediate has been convened to iron (III), increasing the average oxidation rate to greater than 10 g iron(III)/l/hr.

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patent: 5399278 (1995-03-01), Yamashita et al.

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