Method for preparing iron oxides

Details Method for preparing iron oxides Method for preparing iron oxides

C - Chemistry, Metallurgy

01

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C01G 49/02 (2006.01) B01J 23/745 (2006.01) B01J 35/10 (2006.01) B01J 37/12 (2006.01) C01G 49/06 (2006.01) C09C 1/24 (2006.01) B01J 37/08 (2006.01)

Patent

CA 2421363

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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