PARAMETERS INFLUENCING KINETICS OF NICKEL EXTRACTION FROM A GREEK LATERITE DURING LEACHING WITH SULFURIC-ACID AT ATMOSPHERIC-PRESSURE

HALIKIA, I

dc.contributor.author	HALIKIA, I	en
dc.date.accessioned	2014-03-01T01:40:54Z
dc.date.available	2014-03-01T01:40:54Z
dc.date.issued	1991	en
dc.identifier.issn	0371-9553	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23303
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.classification	Mineralogy	en
dc.subject.classification	Mining & Mineral Processing	en
dc.title	PARAMETERS INFLUENCING KINETICS OF NICKEL EXTRACTION FROM A GREEK LATERITE DURING LEACHING WITH SULFURIC-ACID AT ATMOSPHERIC-PRESSURE	en
heal.type	journalArticle	en
heal.language	English	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-mu-m 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.publisher	INST MINING METALLURGY	en
heal.journalName	TRANSACTIONS OF THE INSTITUTION OF MINING AND METALLURGY SECTION C-MINERAL PROCESSING AND EXTRACTIVE METALLURGY	en
dc.identifier.isi	ISI:A1991HM79300006	en
dc.identifier.volume	100	en
dc.identifier.spage	C154	en
dc.identifier.epage	C164	en