Thermodynamic analysis of the reactions of iron oxides: Dissolution in oxalic acid

Panias, D; Taxiarchou, M; Douni, I; Paspaliaris, I; Kontopoulos, A

dc.contributor.author	Panias, D	en
dc.contributor.author	Taxiarchou, M	en
dc.contributor.author	Douni, I	en
dc.contributor.author	Paspaliaris, I	en
dc.contributor.author	Kontopoulos, A	en
dc.date.accessioned	2014-03-01T01:12:26Z
dc.date.available	2014-03-01T01:12:26Z
dc.date.issued	1996	en
dc.identifier.issn	0008-4433	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12101
dc.subject	Iron	en
dc.subject	Iron Oxide	en
dc.subject	Organic Acid	en
dc.subject	Oxalic Acid	en
dc.subject	Thermodynamics	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.other	Agents	en
dc.subject.other	Chemical reactions	en
dc.subject.other	Dissolution	en
dc.subject.other	Free energy	en
dc.subject.other	Ions	en
dc.subject.other	Organic acids	en
dc.subject.other	pH	en
dc.subject.other	Solutions	en
dc.subject.other	Solvents	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Non reductive dissolution	en
dc.subject.other	Oxalic acid	en
dc.subject.other	Reductive dissolution	en
dc.subject.other	Solvent reagents	en
dc.subject.other	Iron oxides	en
dc.title	Thermodynamic analysis of the reactions of iron oxides: Dissolution in oxalic acid	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0008-4433(96)00018-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0008-4433(96)00018-3	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	The mechanism of dissolution of pure iron oxides by means of organic acids comprises two different chemical pathways: (a) non-reductive dissolution and (b) reductive dissolution. In this paper, the thermodynamic analysis of these pathways for the iron oxides-oxalic acid system is presented. In low acid solutions (pH higher than 3) the only thermodynamically stable complex ions of bivalent and trivalent iron are [Fe2+(C2O4)(2)](2-) and [Fe3+(C2O4)(3)](3-). Uncomplexed Fe2+ ion can be identified only in high acid solutions, while uncomplexed Fe3+ ion is not likely to build-up in oxalic acid solutions. In the pH range 1-2 the [Fe3+(C2O4)(2)](-) and [Fe3+C2O4](+) ions are stable, while at pH less than 1, the [Fe3+HC2O4](2+) is the only ion existing. Copyright (C) 1996 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Canadian Metallurgical Quarterly	en
dc.identifier.doi	10.1016/S0008-4433(96)00018-3	en
dc.identifier.isi	ISI:A1996WC39600006	en
dc.identifier.volume	35	en
dc.identifier.issue	4	en
dc.identifier.spage	363	en
dc.identifier.epage	373	en