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EIS studies of chalcopyrite involving iron(II) ions
(2017-01-01)
In this work, we present an Electrochemical Impedance Spectroscopy (EIS) study using a carbon paste electrode modified with chalcopyrite (CuFeS2) containing 50 wt% of the mineral (particle size < 38 μm) and graphite (particle ...
Simulating the main stages of chalcopyrite leaching and bioleaching in ferrous ions solution: An electrochemical impedance study with a modified carbon paste electrode
(2016-06-01)
In this work, we present an electrochemical study using a carbon paste electrode modified with chalcopyrite (CuFeS2) in solution A of T&K medium with different ferrous ion concentrations, in the absence and presence of the ...
Effect of redox potential on chalcopyrite dissolution imposed by addition of ferrous ions
(2017-01-01)
Copper is one of the metals with great economic interest and about 70% of it is found in nature as chalcopyrite mineral (CuFeS2). Due to its slow dissolution kinetics, chalcopyrite dissolution is still a challenge for ...
Optimization of the use of carbon paste electrodes (CPE) for electrochemical study of the chalcopyrite
(Sociedade Brasileira de Química, 2009-01-01)
The use of carbon paste electrodes (CPE) of mineral sulfides can be useful for electrochemical studies to overcome problems by using massive ones. Using CPE-chalcopyrite some variables were electrochemically evaluated. ...
Optimization of the use of carbon paste electrodes (CPE) for electrochemical study of the chalcopyrite
(Sociedade Brasileira de Química, 2009-01-01)
The use of carbon paste electrodes (CPE) of mineral sulfides can be useful for electrochemical studies to overcome problems by using massive ones. Using CPE-chalcopyrite some variables were electrochemically evaluated. ...
New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design
(2022-04-01)
A response surface capable of describing the extraction of copper with high statistical confidence (R2 = 0.9973) was obtained using a central composite factorial design (CCD). The parameters used were the initial concentration ...
Antioxidant enzyme activity in Acidithiobacillus ferrooxidans LR maintained in contact with chalcopyrite
(ELSEVIER SCI LTD, 2010)
The total protein content and activity of the enzymes glutathione reductase (GR), superoxide dismutase (SOD) and thioredoxin reductase (TrxR) were evaluated in Acidithiobacillus ferrooxidans LR cells maintained in contact ...
Oxidative dissolution of chalcopyrite by Thiobacillus ferrooxidans
(1999-12-01)
The oxidative dissolution of research-grade chalcopyrite was characterized in respirometric and growth experiments with Thiobacillus ferrooxidans. In respirometric experiments with chalcopyrite, the pH of mineral salts ...
Oxidation of chalcopyrite by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in shake flasks
(Elsevier B.V., 2002-12-02)
Chalcopyrite oxidation was evaluated with two acidophilic thiobacilli that are important in bioleaching processes. Acidithiobacillus thiooxidans in pure culture did not oxidize CuFeS2 but oxidized externally added S in the ...