Effects of ore mineralogy on the microbial leaching of low grade complex sulphide ores
The effect of ore mineralogy on the microbial leaching of low grade complex sulphide ores was investigated by utilizing mineralogical data on the variations in mineral and phase distribution within particle sizes of − 53, 53, 75 and 106 μm of a Nigerian ore consisting of siderite, sphalerite, galena...
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| Published in: | Hydrometallurgy Vol. 86; no. 1; pp. 96 - 104 |
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| Format: | Journal Article |
| Language: | English |
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Elsevier B.V
01-04-2007
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| Abstract | The effect of ore mineralogy on the microbial leaching of low grade complex sulphide ores was investigated by utilizing mineralogical data on the variations in mineral and phase distribution within particle sizes of −
53, 53, 75 and 106 μm of a Nigerian ore consisting of siderite, sphalerite, galena and quartz, with traces of pyrite and chalcopyrite. Bioleaching was conducted using mixed cultures of
Acidithiobacillus ferrooxidans,
Acidithiobacillus thiooxidans and
Leptospirillum ferrooxidans in mechanically stirred glass reactors. The highest bioleaching recoveries were obtained at a particle size of 75 μm, while particle sizes of 106 μm gave the least recoveries. Mineral phases and morphologies of the bulk ore and the leached residues respectfully examined with XRD and SEM analysis showed differences both in phase and morphological changes, with the 75 μm having the highest transformation and attack. Higher silica contents which reduced acidity, iron mobility and oxidation led to lower recoveries at particle sizes of 53 and −
53 μm. |
|---|---|
| AbstractList | The effect of ore mineralogy on the microbial leaching of low grade complex sulphide ores was investigated by utilizing mineralogical data on the variations in mineral and phase distribution within particle sizes of -53, 53, 75 and 106 mu m of a Nigerian ore consisting of siderite, sphalerite, galena and quartz, with traces of pyrite and chalcopyrite. Bioleaching was conducted using mixed cultures of Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferrooxidans in mechanically stirred glass reactors. The highest bioleaching recoveries were obtained at a particle size of 75 mu m, while particle sizes of 106 mu m gave the least recoveries. Mineral phases and morphologies of the bulk ore and the leached residues respectfully examined with XRD and SEM analysis showed differences both in phase and morphological changes, with the 75 mu m having the highest transformation and attack. Higher silica contents which reduced acidity, iron mobility and oxidation led to lower recoveries at particle sizes of 53 and -53 mu m. The effect of ore mineralogy on the microbial leaching of low grade complex sulphide ores was investigated by utilizing mineralogical data on the variations in mineral and phase distribution within particle sizes of − 53, 53, 75 and 106 μm of a Nigerian ore consisting of siderite, sphalerite, galena and quartz, with traces of pyrite and chalcopyrite. Bioleaching was conducted using mixed cultures of Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferrooxidans in mechanically stirred glass reactors. The highest bioleaching recoveries were obtained at a particle size of 75 μm, while particle sizes of 106 μm gave the least recoveries. Mineral phases and morphologies of the bulk ore and the leached residues respectfully examined with XRD and SEM analysis showed differences both in phase and morphological changes, with the 75 μm having the highest transformation and attack. Higher silica contents which reduced acidity, iron mobility and oxidation led to lower recoveries at particle sizes of 53 and − 53 μm. |
| Author | Ndlovu, S. Potgieter, J.H. Olubambi, P.A. Borode, J.O. |
| Author_xml | – sequence: 1 givenname: P.A. surname: Olubambi fullname: Olubambi, P.A. email: polubambi@prme.wits.ac.za, polubambi@yahoo.com organization: School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private bag 3, WITS 2050, Johannesburg, South Africa – sequence: 2 givenname: S. surname: Ndlovu fullname: Ndlovu, S. organization: School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private bag 3, WITS 2050, Johannesburg, South Africa – sequence: 3 givenname: J.H. surname: Potgieter fullname: Potgieter, J.H. organization: School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private bag 3, WITS 2050, Johannesburg, South Africa – sequence: 4 givenname: J.O. surname: Borode fullname: Borode, J.O. organization: Department of Metallurgical and Materials Engineering, Federal University of Technology, PMB 704, Akure, Nigeria |
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| Keywords | Bioleaching Particle size Ore mineralogy Sulphide ore Bacterial leaching Hydrometallurgy |
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| Title | Effects of ore mineralogy on the microbial leaching of low grade complex sulphide ores |
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