Selective separation of pyrite and chalcopyrite by biomodulation

Chandraprabha, M. N. ; Natarajan, K. A. ; Modak, Jayant M. (2004) Selective separation of pyrite and chalcopyrite by biomodulation Colloids and Surfaces B: Biointerfaces, 37 (3-4). pp. 93-100. ISSN 0927-7765

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Selective separation of pyrite from other associated ferrous sulphides at acidic and neutral pH has been a challenging problem. This paper discusses the utility of Acidithiobacillus ferrooxidans for the selective flotation of chalcopyrite from pyrite. Consequent to interaction with bacterial cells, pyrite remained depressed even in the presence of potassium isopropyl xanthate collector while chalcopyrite exhibited significant flotability. However, when the minerals were conditioned together, the selectivity achieved was poor due to the activation of pyrite surface by the copper ions in solution. The selectivity was improved when the sequence of conditioning with bacterial cells and collector was reversed, since the bacterial cells were able to depress collector interacted pyrite effectively, while having negligible effect on chalcopyrite. The observed behaviour is analysed and discussed in detail. The separation obtained was significant both at acidic and alkaline pH. This selectivity achieved was retained when the minerals were interacted with both bacterial cells and collector simultaneously.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Acidithiobacillus ferrooxidans; Pyrite; Chalcopyrite; Activation; Selective Flotation
ID Code:24435
Deposited On:29 Nov 2010 08:55
Last Modified:09 Jun 2011 04:13

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