Effect of iron powder on copper extraction by acid leaching of chalcopyrite concentrate.

Sanchez, Ezequiel Cruz; Umetsu, Yoshiaki; Sanda, Fumio

doi:10.1252/jcej.29.720

Cited by 11 publications

(3 citation statements)

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“…Other researchers studied the catalytic effect of inorganic compounds, like pyrite [20], iron powder [21], nanosized silica [22], and, more recently, coal, carbon black, or activated carbon [14,23]. The use of activated carbon enhances the kinetics of sulfide minerals leaching in sulfate media, leading to a substantial increase in copper extraction rate [24].…”

Section: Introductionmentioning

confidence: 99%

Hydrometallurgical Recovery of Cu and Zn from a Complex Sulfide Mineral by Fe3+/H2SO4 Leaching in the Presence of Carbon-Based Materials

Álvarez

Fidalgo

Gascó

et al. 2021

Metals

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Chalcopyrite, the main ore of copper, is refractory in sulfuric media with slow dissolution. The most commonly employed hydrometallurgical process for the oxidation of chalcopyrite and copper extraction is the sulfuric acid ferric sulfate system The main objective of the present work is to study the use of cheap carbon-based materials in the leaching of copper and zinc from a sulfide complex mineral from Iberian Pyrite Belt (IPB). The addition effect of commercial charcoal (VC) and two magnetic biochars (BM and HM) that were obtained by pyrolysis of biomass wastes was compared to that of commercial activated carbon (AC). The experimental results performed in this work have shown that the presence of carbon-based materials significantly influences the kinetics of chalcopyrite leaching in the sulfuric acid ferric sulfate media at 90 °C. The amount of copper and zinc extracted from IPB without the addition of carbon-based material was 63 and 72%, respectively. The highest amount of extracted zinc (>90%) was obtained with the addition of VC and AC in IPB/carbon-based material ratio of 1/0.25 w/w. Moreover, it is possible to recover more than 80% of copper with the addition of VC in a ratio 1/0.25 w/w. Moreover, an optimization of the properties of the carbon-based material for its potential application as catalyst in the leaching of metals from sulfide is necessary.

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Section: Introductionmentioning

confidence: 99%

Hydrometallurgical Recovery of Cu and Zn from a Complex Sulfide Mineral by Fe3+/H2SO4 Leaching in the Presence of Carbon-Based Materials

Álvarez

Fidalgo

Gascó

et al. 2021

Metals

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“…Despite the advantages of the hydrometallurgical process such as short construction time, low cost, operation simplicity, typically less energy-intensive, more suitable for low grade and complex ore types, and lower environmental impacts [18,[38][39][40][41][42], the extraction of copper from chalcopyrite in acidic medium is both very slow and ineffective at low temperatures due to the stable passivation layers [11,17,19,22,[33][34][35][42][43][44][45][46][47][48]. It has been stated in the literature that grinding to a very fine particle size [49], pressure, temperature, powerful oxidizing agents [7,19,32,36,[50][51][52][53][54][55][56][57][58], and roasting/calcination of the ore/concentrate [19,30,59] can be used to increase the dissolution kinetic and copper extraction recovery by eliminating the effect of this passivation layer forms, whose chemistry, nature, and formation mechanism are still poorly understood [11,15,32,42,[60][61]…”

Section: Introductionmentioning

confidence: 99%

Optimization of sulfuric acid leaching of roasted chalcopyrite concentrate with Box–Wilson experimental design

et al. 2020

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Chalcopyrite (CuFeS 2 ) is commonly used ore in production of copper, but leaching of this ore is very slow and inefficient due to "passivation" during leaching at atmospheric conditions. In this study, in order to overcome drawbacks of the passivation layers, the concentrate supplied from Eti Bakır A.Ş. Küre Plant in Turkey was roasted at 600 °C for 1 h and after leached. Box-Wilson procedure of statistical experimental design was utilized to identify the effects of significant leaching variables for instance leaching time (X 1 ; 10-120 min), solid/liquid ratio (X 2 ; 0.01-0.20), and H 2 SO 4 concentration (X 3 ; 0.01-1.00 M) on Cu extraction (%) from roasted concentrate and was tried to be optimized. The coefficients of response functions have been calculated by regression analysis, and the estimates have been found to be well in line with the experimental outcomes. The optimal leaching parameters, time, solid/liquid rate and H 2 SO 4 concentration were determined as 115 min, 0.116, and 0.71 M, respectively, and the highest Cu extraction (%) value was calculated as 92.45%.

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“…Activation of the mineral surfaces using ultrafine grinding (d 80 = 5-10 µm) has been employed to accelerate the oxidation kinetics and increase copper extraction from chalcopyrite [11,12]. Other methods to accelerate chalcopyrite dissolution include the addition of activated carbon [13], coal [14], silver [15], nitrate [16], nitrite [17,18], iron powder [19], or by controlling the redox potential [20]. The fundamental mechanisms and kinetics of the leaching of chalcopyrite remain poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Cupric and Chloride Ions: Leaching of Chalcopyrite Concentrate with Low Chloride Concentration Media

et al. 2019

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In this paper, the effect of the cupric and chloride ions concentrations on copper dissolution from chalcopyrite concentrate was studied in acidified media. Variables included three different concentrations of Cu2+ (0.5, 1.5, and 2.5 g L−1), four different concentrations of Cl− (0, 5, 7, and 10 g L−1), two different pH values of 1 and 2, and a constant temperature of 60 °C. Results indicated that addition of Cl− to the system improves copper extractions, especially at higher concentrations of Cu2+. Initial copper concentrations in the leaching solution did not significantly affect the copper extraction when Cl− was not present. Better copper extractions were obtained at pH 1 as compared with pH 2. As the Cu2+ and Cl− concentrations were increased, higher values of redox potential were obtained. According to the formation constants of the chloro-complexes, the predominant species in the Cu2+/Cl− system in the studied interval were CuCl+ and Cu2+. Using a model of copper speciation in the experimental range predicted for a single copper concentration with increasing Cl− concentration, the Cu2+ concentration decreased significantly while the concentration of the chloro-complex species CuCl+ increased. In the leached residue, evidence of sulfur formation was found using SEM and corroborated by XRD analysis. When chloride is present in the medium, the amounts of copper and iron in the residue decrease, confirming a positive effect of chloride on the extraction of copper from concentrate for the studied conditions.

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Effect of iron powder on copper extraction by acid leaching of chalcopyrite concentrate.

Cited by 11 publications

References 1 publication

Hydrometallurgical Recovery of Cu and Zn from a Complex Sulfide Mineral by Fe3+/H2SO4 Leaching in the Presence of Carbon-Based Materials

Hydrometallurgical Recovery of Cu and Zn from a Complex Sulfide Mineral by Fe3+/H2SO4 Leaching in the Presence of Carbon-Based Materials

Optimization of sulfuric acid leaching of roasted chalcopyrite concentrate with Box–Wilson experimental design

Cupric and Chloride Ions: Leaching of Chalcopyrite Concentrate with Low Chloride Concentration Media

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