LEACHING OF NICKEL AND IRON GREEK NON-SULFIDE NICKELIFEROUS ORES BY ORGANIC-ACIDS

TZEFERIS, PG; AGATZINILEONARDOU, S

dc.contributor.author	TZEFERIS, PG	en
dc.contributor.author	AGATZINILEONARDOU, S	en
dc.date.accessioned	2014-03-01T01:42:50Z
dc.date.available	2014-03-01T01:42:50Z
dc.date.issued	1994	en
dc.identifier.issn	0304-386X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23959
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.title	LEACHING OF NICKEL AND IRON GREEK NON-SULFIDE NICKELIFEROUS ORES BY ORGANIC-ACIDS	en
heal.type	journalArticle	en
heal.language	English	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.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	HYDROMETALLURGY	en
dc.identifier.isi	ISI:A1994PP87400006	en
dc.identifier.volume	36	en
dc.identifier.issue	3	en
dc.identifier.spage	345	en
dc.identifier.epage	360	en