Recovery of copper and precious metals from chalcopyrite low grade ores - choice between flotation or microorganisms leaching

Krstev, Boris and Golomeov, Blagoj and Konzulov, Gerasim and Gocev, Zivko (1998) Recovery of copper and precious metals from chalcopyrite low grade ores - choice between flotation or microorganisms leaching. In: IMPC, Turkey.

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Abstract

The conventional flotation technologies cannot provide fair results when to applied to very low grade ores or to "refractory" ores. This class include intimate and nonuniform mineral associations, with partialy oxidized minerals and high secondary mineral content and also high soluble salt content, pre-activated minerals because of the excessive permeability of the deposit and of the intense circulation of waters with heavy metal ions etc. Bacterial oxidation as a means to the recovery of metals from sulphidic deposits has been used for thousands of year. One of the major use of biooxidation is the leaching of copper or the liberation of refractory gold where this is encapsulated in pyrite. In the Bucim copper mine Macedonia, porphiritic type, the final product from flotation is the copper concentrate consisting 20% Cu, 21 g/t gold and 25 g/t silver, with appropriate recoveries: 88% for copper, 60% for gold and 35% for silver. The carried out investigations of the leaching in the agitated tank involve microorganisms, tiobacillus ferro-oxidans and thiobacillus thio-oxidans. The achieved results are following: copper recovery 95%, gold recovery from 70-85% and silver recovery from 70-80%.

Item Type: Conference or Workshop Item (Paper)
Subjects: Engineering and Technology > Other engineering and technologies
Divisions: Faculty of Natural and Technical Sciences
Depositing User: Aleksandar Krstev
Date Deposited: 27 Dec 2012 14:52
Last Modified: 21 Aug 2013 14:03
URI: http://eprints.ugd.edu.mk/id/eprint/4645

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