Parameters influencing kinetics of nickel extraction from a Greek laterite during leaching with sulphuric acid at atmospheric pressure

Halikia, Iliana

dc.contributor.author	Halikia, Iliana	en
dc.date.accessioned	2014-03-01T01:40:49Z
dc.date.available	2014-03-01T01:40:49Z
dc.date.issued	1991	en
dc.identifier.issn	03719553	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23255
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0026225125&partnerID=40&md5=6933eaea37b3f274aecdfe44a6a4a684	en
dc.subject.other	Clay Minerals	en
dc.subject.other	Extractive Metallurgy	en
dc.subject.other	Leaching	en
dc.subject.other	Reaction Kinetics	en
dc.subject.other	Sulfuric Acid	en
dc.subject.other	Greek Laterite	en
dc.subject.other	Nickel	en
dc.title	Parameters influencing kinetics of nickel extraction from a Greek laterite during leaching with sulphuric acid at atmospheric pressure	en
heal.type	journalArticle	en
heal.publicationDate	1991	en
heal.abstract	The influence of kinetic parameters on the extraction of nickel from a hematitic-type laterite during leaching with sulphuric acid at atmospheric pressure was examined. The mineralogical composition of the ore was determined and the mineral phases with which nickel is associated were identified. The ore was prepared by grinding to -420 μm and classification into granulometric fractions. Prior to the main series of experiments the effect of agitation rate on nickel recovery was investigated. Then the influence of sulphuric acid concentration, temperature and particle size on the kinetics of nickel extraction was studied, both qualitatively and quantitatively, over fixed value intervals. Particular attention was paid to the effect of these parameters on nickel recovery, on the stability of the predominant mechanism and on extraction rate using initial values of the `mean' and `instantaneous' rates calculated from the experimental data. Application of the initial rate method enabled determination both of the order of reaction with respect to sulphuric acid concentration and of the activation energy for the dissolution of nickel. The results indicate that a physical mechanism can be ruled out as the rate-determining step in the extraction of nickel from the ore and that a chemical mechanism is more likely.	en
heal.journalName	Transactions of the Institution of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy	en
dc.identifier.volume	100	en
dc.identifier.spage	154	en
dc.identifier.epage	164	en