The leaching of iron oxides in boehmitic bauxite by hydrochloric acid

Patermarakis, G; Paspaliaris, Y

dc.contributor.author	Patermarakis, G	en
dc.contributor.author	Paspaliaris, Y	en
dc.date.accessioned	2014-03-01T01:07:41Z
dc.date.available	2014-03-01T01:07:41Z
dc.date.issued	1989	en
dc.identifier.issn	0304-386X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10121
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0024755006&partnerID=40&md5=47647d432a5f78621d42af741516933e	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.other	Chemical Reactions--Reaction Kinetics	en
dc.subject.other	Hydrometallurgy	en
dc.subject.other	Iron Oxides--Removal	en
dc.subject.other	Activation Energy	en
dc.subject.other	Boehmitic Bauxite	en
dc.subject.other	Hematite	en
dc.subject.other	Bauxite Ore Treatment	en
dc.title	The leaching of iron oxides in boehmitic bauxite by hydrochloric acid	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1989	en
heal.abstract	The leaching of iron oxides from boehmitic bauxite with hydrochloric acid has been investigated by means of optical microscopy, electron microscopy and electron microprobe analysis methods. Similar rectangular parallelepiped-shaped bauxite specimens were used for the leaching experiments. The experiments were carried out in a magnetically-stirred spherical reactor, thermostatically controlled at different temperatures and concentrations of hydrochloric acid. The kinetics of iron removal were followed by measuring the width of the reacted shell which was formed around the bauxite specimens during leaching. The experimental results suggested that the shrinking unreacted core model applies. The kinetic equation y = k C t2 3 was found to fit the experimental results satisfactorily. An activation energy of 19.6 kJ mol-1 was found, supporting the idea that the slow stage of the overall reaction is the diffusion of hydrochloric acid through the pores formed mainly by dissolution of hematite phases. In all leaching conditions employed the complete removal of iron did not occur. The residual iron in the reacted layer did not appear to be significantly affected by variation of the leaching conditions for which the proposed model applies. © 1989.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Hydrometallurgy	en
dc.identifier.isi	ISI:A1989AX25300006	en
dc.identifier.volume	23	en
dc.identifier.issue	1	en
dc.identifier.spage	77	en
dc.identifier.epage	90	en