公开(公告)号：US20040202606A1

公开(公告)日：2004-10-14

申请号：US10836304

申请日：2004-04-30

Applicant: SUD Chemie MT S.r.l.

Inventor： Esterino Conca ,  Carlo Rubini ,  Guido Petrini

IPC: C01G049/06

CPC classification number: B41F1/08 ,  B01J23/745 ,  B01J35/10 ,  B01J35/1014 ,  B01J35/1019 ,  B01J37/086 ,  B01J37/12 ,  B41F1/50 ,  C01G49/02 ,  C01G49/06 ,  C01P2006/12 ,  C01P2006/13 ,  C09C1/24

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 350null 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.