Cobalt recovery from mixed Co-Mn hydroxide precipitates by ammonia-ammonium carbonate leaching

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

dc.contributor.author	Katsiapi, A	en
dc.contributor.author	Tsakiridis, PE	en
dc.contributor.author	Oustadakis, P	en
dc.contributor.author	Agatzini-Leonardou, S	en
dc.date.accessioned	2014-03-01T01:33:00Z
dc.date.available	2014-03-01T01:33:00Z
dc.date.issued	2010	en
dc.identifier.issn	0892-6875	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20274
dc.subject	Ammoniacal leaching	en
dc.subject	Cobalt	en
dc.subject	Manganese	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	Ammoniacal leaching	en
dc.subject.other	Ammonium carbonate	en
dc.subject.other	Cobalt recovery	en
dc.subject.other	Hausmannites	en
dc.subject.other	Leach liquors	en
dc.subject.other	Leached residues	en
dc.subject.other	Main effect	en
dc.subject.other	Mineralogical phasis	en
dc.subject.other	Minor constituents	en
dc.subject.other	Mixed hydroxide	en
dc.subject.other	Solid-to-liquid ratio	en
dc.subject.other	Statistical design	en
dc.subject.other	Sulphates	en
dc.subject.other	Ammonia	en
dc.subject.other	Ammonium compounds	en
dc.subject.other	Carbonates	en
dc.subject.other	Carbonation	en
dc.subject.other	Cobalt	en
dc.subject.other	Leaching	en
dc.subject.other	Magnesium printing plates	en
dc.subject.other	Manganese compounds	en
dc.subject.other	Nickel oxide	en
dc.subject.other	pH effects	en
dc.subject.other	Precipitates	en
dc.subject.other	Recovery	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Manganese	en
dc.title	Cobalt recovery from mixed Co-Mn hydroxide precipitates by ammonia-ammonium carbonate leaching	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.mineng.2010.03.006	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.mineng.2010.03.006	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The research work presented in this paper focused on the recovery of cobalt from mixed Co-Mn hydroxide precipitates (obtained from sulphate leach liquors of nickel oxide ore), using ammonia-ammonium carbonate leaching. The characterization of the initial mixed hydroxide precipitates, as well as the corresponding leached residue was carried out by X-ray Diffraction, TG-DTA and Scanning Electron Microscopy. Cobalt and manganese precipitation was based on the statistical design and analysis of experiments, in order to determine the main effects and interactions of the precipitation factors, which were the equilibrium pH and the temperature. Co and Mn were precipitated as hydroxides at pH = 10.5 and T = 25 degrees C. using 5 M NaOH as a neutralizing agent, by 99.9% and 99.5%, respectively. The main mineralogical phases were, Mn3O4 (Hausmannite), gamma-Mn3O4 and CoMn2O4, while Co(OH)(2) and Mn(OH)(2) (Pyrochroite) were also present as minor constituents. Cobalt and manganese separation was based on selective cobalt recovery by ammonia-ammonium carbonate leaching of the produced mixed hydroxide precipitate. The factors studied were the ammonia-ammonium carbonate concentration and the solid to liquid ratio. The cobalt recovery efficiency reached 93%. Mn3O4 (Hausmannite) was the main mineralogical phase of the leached residue, while MnCO3 (Rhodochrosite) and Mn2O3 were also present. Small quantities of cobalt were also observed in the residue as CoMn2O4. (C) 2010 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.2010.03.006	en
dc.identifier.isi	ISI:000278791400008	en
dc.identifier.volume	23	en
dc.identifier.issue	8	en
dc.identifier.spage	643	en
dc.identifier.epage	651	en