US5641470A - Process for making goethite - Google Patents

This invention provides a method of producing 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 ironIII/l/hr to form seed particles ...

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