Dissolution of hematite in acidic oxalate solutions

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

dc.contributor.author	Taxiarchou, M	en
dc.contributor.author	Panias, D	en
dc.contributor.author	Douni, I	en
dc.contributor.author	Paspaliaris, I	en
dc.contributor.author	Kontopoulos, A	en
dc.date.accessioned	2014-03-01T01:12:46Z
dc.date.available	2014-03-01T01:12:46Z
dc.date.issued	1997	en
dc.identifier.issn	0304-386X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12240
dc.subject	Iron	en
dc.subject	Visible Light	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.other	Composition effects	en
dc.subject.other	Dissolution	en
dc.subject.other	Impurities	en
dc.subject.other	Ions	en
dc.subject.other	Iron	en
dc.subject.other	Organic compounds	en
dc.subject.other	Oxidation	en
dc.subject.other	pH effects	en
dc.subject.other	Solutions	en
dc.subject.other	Thermal effects	en
dc.subject.other	Acidic oxalate	en
dc.subject.other	Hematite	en
dc.subject.other	Minerals	en
dc.title	Dissolution of hematite in acidic oxalate solutions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0304-386X(96)00075-8	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0304-386X(96)00075-8	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	The dissolution of hematite in acidic oxalate solutions has been studied under various experimental conditions. The effect of temperature, oxalate concentration and pH on hematite dissolution were studied. In order to study the effect of atmospheric oxygen and light on the dissolution reaction, experiments were carried out in an inert atmosphere (purging with argon), in an 'oxidising atmosphere' (without purging), in the presence of visible light and in darkness. It was found that the dissolution process is much faster in an inert atmosphere under visible light. The dissolution process in all other cases was very slow, including a characteristic induction period, attributed to ferrous ion generation in solution through a heterogeneous, time-consuming reductive pathway. In an oxidising atmosphere the dissolution process is seriously retarded due to the oxidation of ferrous to ferric ions by the dissolved atmospheric oxygen. Iron dissolution is highly dependent on temperature and pH of the solution, while it is practically independent of the total oxalate concentration.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Hydrometallurgy	en
dc.identifier.doi	10.1016/S0304-386X(96)00075-8	en
dc.identifier.isi	ISI:A1997WK77400002	en
dc.identifier.volume	44	en
dc.identifier.issue	3	en
dc.identifier.spage	287	en
dc.identifier.epage	299	en