Removal of iron from silica sand by leaching with oxalic acid

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	2014-03-01T01:13:18Z
dc.date.available	2014-03-01T01:13:18Z
dc.date.issued	1997	en
dc.identifier.issn	0304-386X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12422
dc.subject	Iron	en
dc.subject	Oxalic Acid	en
dc.subject	Process Parameters	en
dc.subject	Silica	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.other	Carboxylic acids	en
dc.subject.other	Dissolution	en
dc.subject.other	Extraction	en
dc.subject.other	Iron	en
dc.subject.other	Leaching	en
dc.subject.other	pH effects	en
dc.subject.other	Silica sand	en
dc.subject.other	Thermal effects	en
dc.subject.other	Oxalic acid	en
dc.subject.other	Hydrometallurgy	en
dc.title	Removal of iron from silica sand by leaching with oxalic acid	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0304-386X(97)00015-7	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0304-386X(97)00015-7	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	The removal of iron from silica sand with oxalic acid has been studied under various experimental conditions in order to optimise the process parameters and reach a high degree of iron removal at minimum operating cost. The parameters studied were: temperature, pH of the solution, oxalate concentration, Ar purging, and ferrous ions addition to the solution. For the specific silica sand sample used, at temperatures varying between 90-100 degrees C the maximum iron extraction that can be achieved is approximately 40%. At temperatures lower than 80 degrees C this extraction is decreased to 30%. At these temperatures purging of the oxalate solution with Ar and ferrous ions addition has no effect on the iron extraction, while at temperatures lower than 25 degrees C iron dissolution is accelerated with the addition of ferrous ions. Iron dissolution is significantly affected by the pH, while it is practically independent of the oxalate concentration and the pulp density. Without the addition of bivalent iron, iron extraction is optimised in high acid solutions; when ferrous ions are added in the oxalate solution, best results are achieved at pH 3. (C) 1997 Elsevier Science B.V.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Hydrometallurgy	en
dc.identifier.doi	10.1016/S0304-386X(97)00015-7	en
dc.identifier.isi	ISI:A1997XW75700017	en
dc.identifier.volume	46	en
dc.identifier.issue	1-2	en
dc.identifier.spage	215	en
dc.identifier.epage	227	en