chalcopyrite film concentration

  • Chalcopyrite - an overview | ScienceDirect Topics

    Chalcopyrite is essentially unleached under the mild oxidizing conditions of heap leaching (very slow leach kinetics). It can, however, be leached under oxidizing conditions at elevated temperatures or by microbial leaching under low-potential conditions (Gericke, Govender, & Pinches, 2010).This has led to extensive study into leaching of chalcopyrite concentrates as an alternative to smelting.

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  • Chalcopyrite - an overview | ScienceDirect Topics

    Chalcopyrite-type materials are currently considered to be the most promising thin-film solar cell materials, because they exhibit direct band gaps well matched to the solar spectrum and because of their very favorable electronic properties that have recently led to solar cell efficiencies surpassing 20%.

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  • Chalcopyrite - an overview | ScienceDirect Topics

    Chalcopyrite is a copper iron sulfide (CuFeS 2) mineral with a brassy to golden yellow color (Fig. 1.36). Chalcopyrite contains 34.5% Cu, 30.5% Fe, and 35.0% S. The mineral is the principal source of copper metal, and one of the major source of sulfur. The mineral also contains traces of elements of gold and nickel and recovered in refinery.

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  • Hydrothermal pretreatment of chalcopyrite concentrate with ...

    Aug 01, 2020 · Chalcopyrite concentrate was upgraded up to 50–55% Cu at optimized conditions. • A parametric model of hydrothermal pretreatment operation was obtained. • A novel process flowsheet was suggested for chalcopyrite concentrates processing. Abstract

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  • (PDF) LEACHING OF CHALCOPYRITE CONCENTRATE IN

    The maximum copper extraction was obtained with the following conditions without stirring: 240 min of leaching time, 3.0 M hydrogen peroxide concentration, 40°C leaching temperature and 53-75 m...

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  • Electrochemical study and XPS analysis of chalcopyrite ...

    Feb 10, 2021 · 1. Introduction. Chalcopyrite (CuFeS 2) is the most abundant copper-bearing mineral in nature and is the primary mineral used for the commercial production of copper.It accounts for approximately 70% of the world's copper reserves .Various studies have considered the dissolution of CuFeS 2 in different aqueous media; such as sulfates , chlorides [3,4], nitrates [4,5] and, ammonia .

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  • Chalcopyrite Mineral Data

    Chalcopyrite Moncheite. Comments: White moncheite with chalcopyrite (orange, blue and violet tarnishing colors) in silicate matrix.Polished section (from microprobe analysis) in reflected light. Location: Lukkulaisvaara ultrabasic Massif, Olanga (Oulanka) River, Oulanka plutonic complex, Karelia Republic, Northern Region, Russia.Scale: Picture size 0.11 mm.

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  • CIGS film from selenized of the electrodeposited CuIn ...

    Oct 11, 2021 · 高达12%返现 · The chalcopyrite thin films can be fabricated by vacuum [1,2,3] or non-vacuum techniques [4, 5]. ... With decreasing oxygen concentration, the Se concentration in CIGS film increased. The enhancement of the ratio of Se/metal was beneficial to the formation of CIGS phase. Table 2 Compositional values of the wide-area EDS measurements.

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  • US5981868A - Thin-film solar cell comprising thin-film ...

    The light absorbing layer is a thin film of p-type Cu(InGa)Se 2 (CIGS) of the Cu-III-VI 2 chalcopyrite structure and has such a gallium concentration gradient that the gallium concentration gradually (gradationally) increases from the surface thereof to the inside, thereby attaining a

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  • Structure and composition of Zn xCd 1-xS films synthesized ...

    Zinc cadmium sulfide (Zn x Cd 1-x S) thin films grown through chemical bath deposition are used in chalcopyrite solar cells as the buffer layer between the n-type zinc oxide and the p-type light absorbing chalcopyrite film. To optimize energetic band alignment and optical absorption, advanced solar cell architectures require the ability to manipulate x as a function of distance from the ...

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  • Gallium gradients in chalcopyrite thin films: Depth ...

    Cu(In,Ga)Se 2 films are used as absorber layers in chalcopyrite thin film solar cells. As the gallium concentration in the absorber can be used to control the band gap, there have been many efforts to vary the gallium concentration in depth to gain an optimum balance of light absorption, carrier collection, and recombination at different depths of the absorber film, leading to improved quantum ...

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  • (PDF) LEACHING OF CHALCOPYRITE CONCENTRATE IN HYDROGEN ...

    The optimum conditions to obtain the main goal of maximum copper and minimum iron extraction from chalcopyrite were determined as to be sulfuric acid concentration of 2.5 M, hydrogen peroxide ...

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  • Effect of microwave pretreatment on chalcopyrite ...

    2 天前 · The charge transfer resistance during the oxidation of chalcopyrite decreased from 573 Ω cm 2 to 135 Ω cm 2, and the resistance of the passive film decreased from 1.45×10 5 Ω cm 2 to 7.48×10 3 Ω cm 2, indicating that microwave pretreatment can be used as a promising strategy for efficiently promoting chalcopyrite leaching.

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  • Chalcopyrite Leaching with Hydrogen Peroxide in Formic ...

    Feb 20, 2020 · The reason why metal extraction from chalcopyrite is difficult is the formation of a passive film on the reactant surface due to by-products such as elemental sulfur, jarosites and metal sulfides . In this sense, there are different options such as pressure leaching, pyrite addition and bioleaching to achieve high metal extraction efficiency ...

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  • Effect of Nonionic Surfactants on Chalcopyrite Leaching

    Mar 04, 2018 · The fact that chalcopyrite leaching becomes insensitive to increasing LA 790 concentration indicates that the chalcopyrite surface becomes sufficiently wettable at a given level of surfactant. Figures 3 and 4 contain data from designs 1 and 2, respectively, as a function of time.

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  • Kinetics of Hydrogen Reduction of Chalcopyrite Concentrate ...

    Jul 22, 2015 · A Ghatshila chalcopyrite concentrate (average particle size, 50 μm) containing primarily CuFeS2 and SiO2 (Cu 16 pct) was reduced by a stream of hydrogen in a thermogravimetric analyzer (TGA) at selected temperatures [1173 K to 1323 K (900 °C to 1050 °C)], hydrogen flow rates, partial pressures of hydrogen (0.33 × 101.3 to 101.3 kPa), and sample bed heights. The product was a

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  • Minerals | Free Full-Text | Leaching of Chalcopyrite under ...

    Fe 3+ ion concentration, pH, ... The sulfur in the reduced state is oxidized to S 0, and a sulfur film is formed on the chalcopyrite surface, thereby inhibiting the leaching of chalcopyrite. The copper leaching rate decreases and pH increases in the EPS layer.

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  • Characteristics and Parameters of Overstressed Nanosecond ...

    Sep 02, 2020 · The electron concentration was in a range of 2.1 × 1020– 2.7 × 1020 m–3, at a current density (612–765) × 106 A/m2 on the electrode surface (at E/N = 1676 Td). Thin films of chalcopyrite were synthesized on substrates of transparent solid dielectrics, which, in a wide spectral range of 200–800 nm, absorb radiation incident of their ...

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  • Mineralogical Characterization of Chalcopyrite Bioleaching ...

    Jun 03, 2015 · 1. Introduction. Chalcopyrite (CuFeS 2) is the most important copper ore, comprising approximately 70% of copper reserves in the world [1,2].In metallurgical applications, chalcopyrite is mainly subjected to pyrometallurgy treatment after concentration by a flotation process [3,4].The interest in bio-hydrometallurgy has increased recently in order to minimize the sulfur dioxide emissions, and ...

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  • US5474622A - Solar cell having chalcopyrite semiconductor ...

    A solar cell device includes an absorber layer or heterojunction-forming layer which comprises a I-III-VI 2 chalcopyrite semiconductor film containing a Group VIIA element as a dopant. The semiconductor film can be made by depositing a I-III-VI 2 chalcopyrite compound film onto a substrate while evaporating onto the substrate a Group VIIA element to obtain a I-III-VI 2 chalcopyrite compound ...

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  • Enhancing flotation separation of chalcopyrite and ...

    Mar 18, 2021 · According to Fig. 7a, within the pH range of 2–12, the zeta potential of chalcopyrite decreased from 20 to − 27 mV. After treated with PAAS and GA,

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  • Interfacial Alkali Diffusion Control in Chalcopyrite Thin ...

    Alkali elements, specifically sodium (Na), are key materials to enhance the energy conversion efficiencies of chalcopyrite and related thin-film photovoltaic solar cells. Recently, the effect of potassium (K) has also attracted attention because elemental K has unique effects different from Na as well as a similar beneficial effect in improving device performance.

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  • Leaching and Kinetic Study on Pressure Oxidation of ...

    Jun 23, 2017 · The leaching of copper from chalcopyrite in H 2 SO 4 solution under pressure-oxidative conditions and its kinetics were investigated in this study. Leaching variables that affect the rate of copper dissolution from chalcopyrite are agitation speed (300–900 rpm), total pressure (0.8–2.0 MPa), temperature (160–180 °C), and sulfuric acid concentration (0.1–2.0 M).

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  • (PDF) LEACHING OF CHALCOPYRITE CONCENTRATE IN HYDROGEN ...

    The optimum conditions to obtain the main goal of maximum copper and minimum iron extraction from chalcopyrite were determined as to be sulfuric acid concentration of 2.5 M, hydrogen peroxide ...

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  • Copper leaching from chalcopyrite concentrates | SpringerLink

    Chalcopyrite (CuFeS2) is one of the most abundant copper-bearing minerals, which accounts for approximately 70 percent of the world’s known copper reserves. For more than 30 years, a significant number of processes have been developed to leach copper from chalcopyrite concentrates. These processes recover copper via hydrometallurgical leaching of the copper component of chalcopyrite ...

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  • (PDF) Leaching Kinetics Of Copper From Chalcopyrite ...

    Effect of the nitrite concentration on copper recovery. Initial electrolyte conditions: C H 2 SO 4 =1 M, d mean = 15 μm, T = 120 C, P tot = 6 atm Results of the chalcopyrite concentrate head ...

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  • Effect of microwave pretreatment on chalcopyrite ...

    2 天前 · The charge transfer resistance during the oxidation of chalcopyrite decreased from 573 Ω cm 2 to 135 Ω cm 2, and the resistance of the passive film decreased from 1.45×10 5 Ω cm 2 to 7.48×10 3 Ω cm 2, indicating that microwave pretreatment can be used as a promising strategy for efficiently promoting chalcopyrite leaching.

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  • Enhancing flotation separation of chalcopyrite and ...

    Mar 18, 2021 · According to Fig. 7a, within the pH range of 2–12, the zeta potential of chalcopyrite decreased from 20 to − 27 mV. After treated with PAAS and GA,

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  • US5474622A - Solar cell having chalcopyrite semiconductor ...

    A solar cell device includes an absorber layer or heterojunction-forming layer which comprises a I-III-VI 2 chalcopyrite semiconductor film containing a Group VIIA element as a dopant. The semiconductor film can be made by depositing a I-III-VI 2 chalcopyrite compound film onto a substrate while evaporating onto the substrate a Group VIIA element to obtain a I-III-VI 2 chalcopyrite compound ...

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  • Interfacial Alkali Diffusion Control in Chalcopyrite Thin ...

    Alkali elements, specifically sodium (Na), are key materials to enhance the energy conversion efficiencies of chalcopyrite and related thin-film photovoltaic solar cells. Recently, the effect of potassium (K) has also attracted attention because elemental K has unique effects different from Na as well as a similar beneficial effect in improving device performance.

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  • 24 questions with answers in CHALCOPYRITE | Science topic

    Apr 01, 2021 · Question. 2 answers. Nov 9, 2015. In chalcopyrite solid solutions with metal transitions chalcogenides generally we observe the formation of magnetic clusters. In

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  • Extraction of copper from chalcopyrite

    Aug 26, 2021 · Chalcopyrite $(\ce{CuFeS2})$ is the most common copper bearing mineral on earth (Approximately 70% of the world’s copper reserves are contained in the mineral chalcopyrite), but also the most stable minerals because of its structural configuration, face-centered tetragonal lattice (Ref.1). At present, there are basically two main methods ...

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  • Evolution of opto-electronic properties during film ...

    Apr 04, 2017 · Chalcopyrite Cu(In,Ga)Se 2 semiconductors have been among the drivers of thin film solar cell technology. The material exhibits excellent opto-electronic properties and can be deposited on a

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  • Absorber composition: A critical parameter for the ...

    Jul 05, 2020 · The chalcopyrite Cu (In,Ga)(S,Se) 2 selenides and sulfides alloy system is a low-cost, non-toxic, and efficient thin-film photovoltaic technology, with Cu (In,Ga)(S,Se) 2 solar cells now at a record efficiency of 23.35% 1 and Cu (In,Ga)S 2 at 15.5%. 2 Further improvement in efficiency will depend critically on a deeper understanding of the role ...

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  • Chalcopyrite Mineral Data

    Chalcopyrite Moncheite. Comments: White moncheite with chalcopyrite (orange, blue and violet tarnishing colors) in silicate matrix.Polished section (from microprobe analysis) in reflected light. Location: Lukkulaisvaara ultrabasic Massif, Olanga (Oulanka) River, Oulanka plutonic complex, Karelia Republic, Northern Region, Russia.Scale: Picture size 0.11 mm.

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  • (PDF) Simulating the main stages of chalcopyrite leaching ...

    Oxidative dissolution of chalcopyrite by Acidithiobacillus ferrooxidans analyzed by electrochemical impedance spectroscopy and atomic force microscopy. By Ismael Diez Perez and D. Bevilaqua. Mineral Processing and Extractive Metallurgy Review: An International Journal Chemical-Electrochemical Approaches to the Study Passivation of Chalcopyrite ...

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