Dissolution of hematite in acidic oxalate solutions: The effect of ferrous ions addition

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	2014-03-01T01:11:54Z
dc.date.available	2014-03-01T01:11:54Z
dc.date.issued	1996	en
dc.identifier.issn	0304-386X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11849
dc.subject	Active Site	en
dc.subject	Iron	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.other	Composition effects	en
dc.subject.other	Dissolution	en
dc.subject.other	Ions	en
dc.subject.other	Iron	en
dc.subject.other	Iron compounds	en
dc.subject.other	pH effects	en
dc.subject.other	Thermal effects	en
dc.subject.other	Oxalate solutions	en
dc.subject.other	Iron ore treatment	en
dc.title	Dissolution of hematite in acidic oxalate solutions: The effect of ferrous ions addition	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0304-386X(96)00004-7	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0304-386X(96)00004-7	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	Studies on the dissolution of hematite in acidic oxalate solutions have shown that there is a strong relationship between dissolution rates and ferrous ion generation in the solution, The effects of temperature, pH of the solution, oxalate and ferrous ions concentration on the dissolution of hematite in acidic oxalate solutions containing ferrous ions were studied, It was found that the pH of the solution is very important for the dissolution as it affects: (1) the activation of hematite surface with adsorbed hydrogen ions; (2) the adsorption of [Fe(C2O4)(2)](2-) complex ions on surface active sites and (3) the speciation in oxalate solutions containing ferrous ions, Iron dissolution is highly dependent on temperature and ferrous ion concentration, while it is practically independent of the total oxalate concentration. The dissolution of hematite in oxalate solutions comprises three stags: (1) activation of the solid surface; (2) generation of ferrous ions in the solution (induction period); and (3) an autocatalytic dissolution period, When ferrous ions are added, the induction period is eliminated and dissolution proceeds through the autocatalytic pathway.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Hydrometallurgy	en
dc.identifier.doi	10.1016/0304-386X(96)00004-7	en
dc.identifier.isi	ISI:A1996VM89200016	en
dc.identifier.volume	43	en
dc.identifier.issue	1-3	en
dc.identifier.spage	219	en
dc.identifier.epage	230	en