Process for making goethite

Details Process for making goethite Process for making goethite

1994-12-19

1997-07-22

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423633, C01G 4902

Patent

active

056501315

ABSTRACT:
Spindle-shaped goethite particles are produced by oxidizing a ferrous carbonate intermediate in the presence of a growth modifier, or alternatively by changing the flowrate of oxidizing gas during oxidation. The goethite particles thus produced have a narrow size distribution, high aspect ratio and are substantially dendrite-free. These properties make the inventive goethite particles suitable for use in preparation of high density magnetic recording media.

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