Nickel and cobalt precipitation from sulphate leach liquor using MgO pulp as neutralizing agent

Oustadakis, P; Agatzini-Leonardou, S; Tsakiridis, PE

dc.contributor.author	Oustadakis, P	en
dc.contributor.author	Agatzini-Leonardou, S	en
dc.contributor.author	Tsakiridis, PE	en
dc.date.accessioned	2014-03-01T01:24:45Z
dc.date.available	2014-03-01T01:24:45Z
dc.date.issued	2006	en
dc.identifier.issn	0892-6875	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17412
dc.subject	Hydrometallurgy	en
dc.subject	pH control	en
dc.subject	Precipitation	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Mineralogy	en
dc.subject.classification	Mining & Mineral Processing	en
dc.subject.other	Atmospheric pressure	en
dc.subject.other	Cobalt	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Hydrometallurgy	en
dc.subject.other	Leaching	en
dc.subject.other	Nickel	en
dc.subject.other	Optical microscopy	en
dc.subject.other	pH effects	en
dc.subject.other	Precipitation (chemical)	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	X ray diffraction analysis	en
dc.subject.other	Neutralizing agent	en
dc.subject.other	PH control	en
dc.subject.other	Precipitates	en
dc.subject.other	Sulphuric acid	en
dc.subject.other	Magnesia	en
dc.title	Nickel and cobalt precipitation from sulphate leach liquor using MgO pulp as neutralizing agent	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.mineng.2005.11.006	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.mineng.2005.11.006	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	The research work presented in this paper determined the conditions at which nickel and cobalt can be recovered, as easily filterable precipitates, from leach liquors, which are produced by sulphuric acid leaching of nickel oxide ores, at atmospheric pressure. More specifically, nickel and cobalt were precipitated as hydroxides at pH = 9, using MgO pulp as a neutralizing agent, by 99.9% and 99.0%, respectively. At this pH value, manganese, which was contained in the leach liquor, was precipitated having a concentration of about 3% in the final mixed precipitate. Statistical design and analysis of experiments were used in order to determine the main effects and interactions of the precipitation factors, which were the pH at equilibrium and the addition of seed material. The characterization of the produced mixed precipitate was carried out by X-ray diffraction, TG-DTA, scanning electron and optical microscopy and particle size distribution analyzer. The main mineralogical phases in the precipitate were theophrastite (Ni(OH)(2)) and brucite (Mg(OH)(2)). The microscopic observation revealed that the presence of brucite was, mainly, due to the un-reacted MgO pulp, during the precipitation process. This brucite content acted as seed material for nickel precipitation. (c) 2005 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Minerals Engineering	en
dc.identifier.doi	10.1016/j.mineng.2005.11.006	en
dc.identifier.isi	ISI:000240835000008	en
dc.identifier.volume	19	en
dc.identifier.issue	11	en
dc.identifier.spage	1204	en
dc.identifier.epage	1211	en