Leaching of nickel and iron from Greek non-sulphide nickeliferous ores by organic acids

Tzeferis, PG; Agatzini-Leonardou, S

dc.contributor.author	Tzeferis, PG	en
dc.contributor.author	Agatzini-Leonardou, S	en
dc.date.accessioned	2014-03-01T01:09:58Z
dc.date.available	2014-03-01T01:09:58Z
dc.date.issued	1994	en
dc.identifier.issn	0304386X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11265
dc.subject	Iron	en
dc.subject	Nickel	en
dc.subject	Organic Acid	en
dc.subject.other	Acetic acid	en
dc.subject.other	Chelation	en
dc.subject.other	Dissolution	en
dc.subject.other	Iron	en
dc.subject.other	Leaching	en
dc.subject.other	Metal recovery	en
dc.subject.other	Nickel	en
dc.subject.other	Ores	en
dc.subject.other	Organic acids	en
dc.subject.other	pH effects	en
dc.subject.other	Reaction kinetics	en
dc.subject.other	Sulfuric acid	en
dc.subject.other	Citric acid	en
dc.subject.other	Laterite	en
dc.subject.other	Nickeliferous ores	en
dc.subject.other	Oxalic acid	en
dc.subject.other	Extractive metallurgy	en
dc.title	Leaching of nickel and iron from Greek non-sulphide nickeliferous ores by organic acids	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0304-386X(94)90031-0	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0304-386X(94)90031-0	en
heal.publicationDate	1994	en
heal.abstract	Several organic acids were tested and compared for their ability to solubilise nickel and iron from Greek laterite ores. The results were also compared with sulphuric acid leaching under the same conditions. Citric acid proved to be the most effective organic acid for nickel extraction, achieving recoveries up to 60%. In some instances, citric acid gave as high nickel yields as equimolar sulphuric acid under the same leaching conditions but with slower kinetics. It was, however, found that at specific low pH values, adjusted by the addition of sulphuric acid, the citric acid resulted in higher nickel recoveries than sulphuric acid of the same free acid concentration; the better performance was attributed to its strong chelating action under those conditions. Oxalic acid displayed remarkable selectivity in iron extraction, releasing more than 60% of it, but it could hardly dissolve any nickel. Lactic, formic, acetic and salicylic acids were relatively ineffective compared with sulphuric acid. Considerable variability in nickel and iron recoveries was observed when leaching with different laterite ores, due to their different mineralogical analyses. © 1994.	en
heal.journalName	Hydrometallurgy	en
dc.identifier.doi	10.1016/0304-386X(94)90031-0	en
dc.identifier.volume	36	en
dc.identifier.issue	3	en
dc.identifier.spage	345	en
dc.identifier.epage	360	en