Miningheap Bioleaching Of Chalcopyrite

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Study of Bacterial Attachment During the Bioleaching of

11-11-2010In this study the degree of bacterial attachment of the main microorganisms involved in the bioleaching of metal sulfides and their influence on the dissolution rate and final metal extractions were determined Three different mineral sulfides were bioleached chalcopyrite (CuFeS 2 ) sphalerite (ZnS) and pyrite (FeS 2 ) A mixed

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Heap bioleaching of chalcopyrite A review

9 Conclusion present and future of heap bioleaching of chalcopyrite The current scenario of bioleaching in developing countries is quite encouraging Examination of the current large-scale bioleaching operations reveals that an important number of plants are located in developing countries

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Heap bioleaching of chalcopyrite A review

Request PDF on ResearchGate | Heap bioleaching of chalcopyrite A review | Bioleaching is an emerging technology with significant potentials to add value to the mining industries so as to deliver attractive environmental and social benefits to all the associates Chalcopyrite CuFeS2 is the most important copper-bearing mineral in the world and

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Dissolution and Passivation of Chalcopyrite during

2-1-2019Our knowledge on the dissolution and passivation mechanisms of chalcopyrite during bioleaching at low temperature has been limited to date In this study an Acidithiobacillus ferrivorans strain with high tolerance to heavy metals and UV radiation was used for chalcopyrite bioleaching At 6 C no apparent precipitate was detected

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An Experimental Approach for Studying Chalcopyrite

The effect of different microbial consortia on the leaching of chalcopyrite was studied at different temperatures and solution compositions with Boliden's Aitik ore in column reactors simulating heap bioleaching The columns were equipped with sampling chambers and chalcopyrite mineral electrodes in order to investigate the passivation of

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leaching of chalcopyrite

CHALCOPYRITE BIOLEACHING VERSUS PRESSURE BIOLEACHING OF CHALCOPYRITE In the past few years there has been interest to apply bacterial leaching to treat chalcopyrite concentrat For example according to Paul Miller Vice President Acid Leaching of Chalcopyrite

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Bioleaching of copper via iron oxidation from chalcopyrite

could be used for the bioloeaching of chalcopyrite at elevated temperatures 3 3 Effect of temperature adaptation on the bioleaching of chalcopyrite A sub-culture of At ferrooxidans that had previously been adapted to Fe2+ oxidation at 40 C was used for copper and iron dissolution (bioleaching) from chalcopyrite at 40 C and

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Presentation on mechanisms and applications of

1-8-2019This review outlines classic and current research scientific documents and research achievements in bioleaching particularly in respect of the bioleaching of chalcopyrite and pyrite The diversity and commonality of the microbial leaching process can be easily studied through comparing the bioleaching mechanism and the application

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Bioleaching metal solubilization by microorganisms

Abstract Bioleaching is a simple and effective technology for metal extraction from low-grade ores and mineral concentrates Metal recovery from sulfide minerals is based on the activity of chemolithotrophic bacteria mainly Thiobacillus ferrooxidans and T thiooxidans which convert insoluble metal sulfides into soluble metal sulfates

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Bioleaching

Bioleaching of chalcopyrite ores and concentrates using mesophilic microorganisms does not yield acceptable copper extraction mainly due to problems associated with mineral surface passivation by elemental sulfur iron hydroxide precipitates (jarosites) and intermediate polysulfides at the temperatures and redox potentials encountered under

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Investigation of Controlled Redox Potential with Pyrite

Various methods of controlling redox potential (ORP) with electrochemical bioreactor and others have been investigated to increase copper extraction of chalcopyrite in bioleaching but less attention has been paid to reducing ferric to ferrous ions Therefore in this work the redox potential of chalcopyrite bioleaching system in the presence

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Impact of Molecular Hydrogen on Chalcopyrite

Chalcopyrite bioleaching in M sedula cultures was compared to that in abiotic controls 9 days postinoculation Visual inspection of chalcopyrite cultures with an air-only headspace revealed evidence of biotic activity (rust-colored precipitate) compared to their abiotic control

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Interaction mechanism of Cu Fe ions and extracellular

extracellular polymeric substances during bioleaching chalcopyrite by Acidithiobacillus ferrooxidans ATCC2370 Run-lan YU Jing LIU An CHEN Dai-li ZHONG Qian LI Wen-qing QIN Guan-zhou QIU Guo-hua GU Key Laboratory of Biometallurgy Ministry

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Mixed Moderate Thermophilic Bioleaching of Cu Mo and Re

of mixed moderate thermophilic bioleaching approach in extraction of Cu Mo and Re from molybdenite concentrate containing 0 98% Cu 1 56% Fe 53 84% Mo and 0 055% Re Molybdenite was the major phase of Mo-bearing mineral and chalcopyrite covellite and pyrite were distinguished as minor phases

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Kinetics of the Bioleaching of Chalcopyrite Concentrate by

Kinetics of the Bioleaching of Chalcopyrite Concentrate by Acidophilic Thermophile Acidianus brierleyi Yasuhiro Konishi * Satoru Asai and Masahiko Tokushige Department of Chemical Engineering Osaka Prefecture University 1-1 Gakuen-cho Sakai Osaka 599-8531 Japan Toru Suzuki

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Department Keyword A ferrooxidans pyrite pyrrhotite

On the other hand very few studies compared the bioleaching rates of 84 pyrite pyrrhotite and chalcopyrite (Lei et al 2007) The objective of this study was to 85 investigate the dissolution kinetic mechanisms of pyrite pyrrhotite chalcopyrite and 86 compare the bioleaching rates in the presence of A ferrooxidans 87 2

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Enhancing gold recovery by bioleaching of chalcopyrite

ENHANCING GOLD RECOVERY BY BIOLEACHING OF CHALCOPYRITE LOW GRADE ORE Krstev B Golomeov B ** ABSTRACT Andesites are barren in general however copper mineralization associated with fractures The conventional flotation can't provide and joining is found in the andesites as well fair results when applied to very low grade ores After 1979 the

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Bioleaching of chalcopyrite with different crystal phases

Abstract Bioleaching of chalcopyrite with different crystal structures (α-phase β-phase and γ-phase) by Acidianus manzaensis was comparatively studied by synchrotron radiation based X-ray diffraction (SR-XRD) and S K-edge X-ray absorption near edge structure (XANES) spectroscopy

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Presentation on mechanisms and applications of

Liang et al found that the the leaching rate of copper was obviously improved from 64% to 95% during the process of 10 days when 2 g/L of activated carbon was added to the chalcopyrite bioleaching systems with extreme thermophile Acidianus manzaensis

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Current scenario of chalcopyrite bioleaching a review

Chalcopyrite is the primary copper mineral used for production of copper metal Today as a result of rapid industrialization there has been enormous demand to profitably process the low grade chalcopyrite and dirty concentrates through bioleaching

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Study by SEM and EDS of chalcopyrite bioleaching using

In tests where iron was added the precipitates appearing on the solid were analysed by X-ray diffraction Bioleaching tests on powdered mineral were carried out at the same temperature pH and stirring conditions A chalcopyrite concentrate (1% pulp density)

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Sulfobacillus thermosulfidooxidans strain Cutipay

Finally the bioleaching tests showed that strain Cutipay resistance enhances chalcopyrite bioleaching at 50C in the presence of chloride based on its fast iron-oxidizing activity compared to the chloride sensitive strain Sulfobacillus acidophilus DSM 10332

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The Effect of Silver Ion Catalysis on Bioleaching of

The bioleaching effect of different concentrations of silver ion catalysis on chalcopyrite tailings has been investigated in shaking flasks In this paper A t ferrooxidans were selected for conducting the bioleaching process Experiments were carried out under the condition of pulp density 150 g/L inoculation amount 106~7 cells/mL pH around

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Adsorption and leaching of chalcopyrite by Sulfolobus

Chalcopyrite dissolves slowly during the bioleaching process primarily because an inhibitory layer containing polysulfides elemental sulfur and iron-hydroxy precipitate may be present on the surface of chalcopyrite ore In this process bioleaching is facilitated by mesophiles and moderate thermoacidophiles [3–4]

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Mesophilic and thermophilic bioleaching of copper from a

The rates of molybdenite bioleaching reported that bioleaching with mesophilic and thermophilic cultures are highly dependent on the experimental conditions such as the could be used to partially dissolve chalcopyrite from a molybdenite con- inoculum pH temperature aeration bioreactor design pulp density centrate

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Intensified bioleaching of chalcopyrite by communities

The chalcopyrite bioleaching experiments were conducted on a rotary platform at 175 rpm for 27 days with 2 0% (w/v) pulp density The solid particles and liquid medium were sterilized by autoclaving (Karan et al 1996) at 110 C for 40 min and 121 C for 25 min respectively

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EPS

chalcopyrite to passivate chalcopyrite and creates the high redox potential space through concentrating Fe3+ ions to accelerate bioleaching pyrite in chalcopyrite concentrates The results suggest that EPS formation promotes bioleaching pyrite and inhibits bioleaching chalcopyrite especially under high potential condition

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Bioleaching of copper via iron oxidation from chalcopyrite

could be used for the bioloeaching of chalcopyrite at elevated temperatures 3 3 Effect of temperature adaptation on the bioleaching of chalcopyrite A sub-culture of At ferrooxidans that had previously been adapted to Fe2+ oxidation at 40 C was used for copper and iron dissolution (bioleaching) from chalcopyrite at 40 C and

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Bioleaching of chalcopyrite and bornite by moderately

Abstract Interactions between chalcopyrite and bornite during bioleaching by moderately thermophilic bacteria were investigated mainly by X-ray diffraction scanning electron microscopy and electrochemical measurements performed in conjunction with bioleaching experiments

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Effect of polyethylene glycol on chalcopyrite bioleaching

Polyethylene glycol(PEG) was used to improve the bioleaching rate of chalcopyrite by Acidithiobacillus ferrooxidans(At f) strain XZ11 The effect of PEG on the Fe2+ oxidizing activities of Acidithiobacillus ferrooxidan and bioleaching of chalcopyrite were investigated The surface morphologies and phase composition of chalcopyrite after

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