Method for preparing iron oxides

Details Method for preparing iron oxides Method for preparing iron oxides

2004-04-30

2008-10-28

Koslow, C. Melissa (Department: 1793)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S634000, C252S062560, C106S456000

Reexamination Certificate

active

07442362

ABSTRACT:
Highly pure iron oxides are prepared by reaction of metallic iron, in the form of microspheroidal particles or of scraps or cuttings, with an agitated aqueous solution of a mono- or polycarboxylic acid with a pKa of 0.5 to 6 relative to the first carboxyl and capable of decomposing, by heating in air at 200 to 350 ° C., to carbon dioxide and water, using 0.03 to 1.5 moles of acid per g-atoms of iron, a water/iron weight ration of 1 to 20, and by oxidation of the ferrous carboxilate to ferric salt, with an agent selected from oxygen, mixtures containing oxygen, hydrogen peroxide, organic peroxides and hydroperoxides.

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Lee et al, “On the Correlation between hyperfine field and the particle size of fine goethite synthesized in chloride solution”, Corrosion Science, 43, pp. 801-808, 2001.
Translation of DE 3622364.
Lee et al.; “On the correlation between the hyperfine field and the particle size of fine goethite syntehsized in chloride solution,”Corrosion Science, 43 (2001) pp. 803-808.

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