Paper Titles
Sulfur Product Layer in Sphalerite Biooxidation: Evidences for a Mechanism of Formation
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Monitoring of Hydrocarbon Gaseous Compounds formed During Bioleaching of Copper Sulphide Minerals with Mesophilic Microorganisms
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Bioleaching of a Mixed Copper Dust Emanating from Copper Smelters
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Investigation of Viscosity and Thermodynamic Properties on the Bioleaching Solution with and without Mesophilic Bacteria
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Process Enhancement of Bioleaching of Covellite Concentrate through Modification of Solution Potential
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The Effect of Aluminium and Magnesium Sulphate on the Rate of Ferrous Iron Oxidation by Leptospirillum ferriphilum in Continuous Culture
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Kinetic Measurement of Biological Oxidation of Ferrous Iron at Low Ferric to Ferrous Ratios in a Controlled Potential Batch Reactor
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Bioleaching of Multimetal Black Shale by Thermophilic Micro-Organisms
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Effect of Temperature on Bioleaching of Chalcopyrite Concentrates containing High Concentrations of Silver: Opposite Rules Apply
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Process Enhancement of Bioleaching of Covellite Concentrate through Modification of Solution Potential

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Abstract:

Based on the bioleaching mechanism and electrochemical studies of covellite, the dissolution rate of covellite mineral is accelerated through increasing the redox potential (Eh) of the leach. In the present work, some methods were adopted to enhance the bioleaching of covellite concentrate (collected from Zijinshan copper mine, Fujian province, China) by adding different oxidants such as pure pyrite, ferric ions and H2O2. The goal of this study was to provide appropriate operating parameters for the industry application and increase the efficiency of the bioleaching of copper mine. The results showed that the optimal way to increase the redox potential (Eh) level was the addition of pure pyrite. This method could effectively raise the Eh of bioleaching process while the effect of environmental change was negligible. It could quicken the leaching process and enhance the final copper recovery through the addition of pyrite by 1:1 or 1:2 ratio of covellite concentrate to pyrite.

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Periodical:

Advanced Materials Research (Volumes 20-21)

Pages:

152-155

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.20-21.152

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Online since:

July 2007

Authors:

E. Zhou, Jian Kang Wen, Ren Man Ruan, Dian Zuo Wang

Keywords:

Bioleaching, Covellite, Enhancement

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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