Catalytic effect of ethylene thiourea on the leaching of ...

2020-9-1 · However, chalcopyrite (CuFeS₂) is the most abundant copper mineral, representing 70% of the known global copper reserve (Schlesinger et al., 2011). Copper extraction from chalcopyrite has been hindered due to its extremely slow dissolution rate and passivation layer observed under standard heap leaching conditions (Hackl et al., 1995).

Electrochemical aspects of leaching copper from …

Electrochemical aspects of semiconductors are used to interpret well established observations on the kinetics of leaching of chalcopyrite. The oxidation of this n-type semiconductor is dominated by a surface film which is thermally unstable and breaks down in CS2, acetone or acidified water, or under dry nitrogen, over comparable time periods.

Kinetic study of copper leaching from chalcopyrite ...

Copper sulfide and copper sulfate precipitates were found in the leaching liquor at 22 °C test. Poorly crystalline copper-iron sulfate phase was observed in the leaching liquor at 35 and 45 °C. This precipitation is believed to be one of the factors to decrease the copper recovery from chalcopyrite.

Copper leaching from nanoparticles of chalcopyrite ...

2008-7-6 · In this research, the effect of mechanical activation, via ball milling, of copper sulfide concentrate on the efficiency and mechanism of copper leaching in an acidic ferric chloride solution was investigated. Copper concentrate, containing chalcopyrite as the main constituent, was supplied from Sarcheshme mine, located in the central part of Iran. By 24 hours of ball milling, the size of the ...

Leaching of Copper from Chalcopyrite Using 50 L Pressure ...

Leaching tests of imported chalcopyrite were performed using a pilot-scale (50 L) pressure oxidation autoclave. The effects of oxygen pressure, temperature, leaching time, and particle size on the leaching efficiencies of copper and iron were investigated by measuring the metal concentrations in the leaching solution and by investigating the leached residue by X-ray diffractometry (XRD).

Oxygen pressure leaching of copper from primary ...

The leaching of primary porphyry chalcopyrite ore under simulated solution-mining conditions was studied using a packed-bed reactor. A mathematical model incorporating the intrinsic leaching kinetics of chalcopyrite and pyrite grains, the pore diffusion of dissolved oxygen within the ore fragments, liquid-solid mass transfer, and the effect of fluid flow and axial dispersion was formulated and ...

Leaching of copper concentrates

2020-4-2 · copper oxides have been in common use for some time. Prior to the development of the Sherritt-Gordon process for nickel and cobalt in which copper is recovered as high grade copper sulfide, copper sulfides were economically recovered in a hydrometallurgical process only during the leaching of waste dumps. . Need for Hydrometallurgical Processes

Copper leaching from chalcopyrite concentrate by …

2019-9-26 · leaching of copper from chalcopyrite [2,3,14-18]. Optimization of the leaching process for the selected raw mineral material requires extensive work on testing the influence of various parameters on the leaching degree of copper. Development of a mathematical model that can be used to predict the ...

Leaching kinetics of copper from chalcopyrite concentrate ...

Treating chalcopyrite flotation concentrates by hydrometallurgical techniques seems to be the most convenient method for leaching copper due to concerns over air pollution and regulations regarding the emission of sulfur dioxide that result from smelting. In this study, the leaching recovery-time trajectories of bulk chalcopyrite concentrate obtained from a flotation plant in the Kastamonu ...

Electrochemistry of the oxidative leaching of copper from ...

1981-2-10 · Electrochemical aspects of semi-conductors explain many features of chalcopyrite leaching by iron (III) and copper (II) salts. A surface film thought to be a metal deficient polysulfide, which is a semi-conductor, forms on chalcopyrite during oxidation. This film is thermally unstable and slows transport of ions, slows electron transfer to ...

Recovery of copper from a surface altered chalcopyrite ...

2014-2-25 · chalcopyrite under natural environmental conditions using percola-tion columns using bacterial film oxidation (BACFOX) bioreactor technology [4]. In addition, the optimal conditions for solvent extrac-tion (SX) and electrowinning (EW) of copper have also been estab-lished to recover pure cathode copper from the Cu-loaded bacterial lixiviant.

Recovery of copper from chalcopyrite

One of the world''s major sources of copper is the ore chalcopyrite (CuFeS 2). The traditional method for recovering copper from copper concentrates which are comprised principally of chalcopyrite is by smelting. In the conventional smelting of copper sulfide concentrates, a copper-iron-sulfide matte is produced in a reverberatory-type furnace.

Copper Leaching from Chalcopyrite: Mechanochemical …

2018-2-13 · Copper Leaching from Chalcopyrite: Mechanochemical Approach Matej TEŠINSKÝ1), Peter BALÁŽ2) Abstract In the presented work, possibilities of intensification of copper leaching from chalcopyrite CuFeS2 induced by mechanical activation was studied. In this article, the influence of mechanical activation time on copper leaching efficiency is ...

LEACHING KINETICS OF COPPER FROM CHALCOPYRITE …

2013-9-7 · Leaching kinetics of copper from chalcopyrite concentrate in nitrous-sulfuric acid 403 samples, determined from measurements on an HORIBA/Partica LA-950V2 Particle Size Analyzer, was 35 μm. Ultrafine milling of the as-received material to 15 μm was performed using a ball mill. The size of the product was confirmed by particle size

Leaching of Copper from Chalcopyrite Using 50 L Pressure ...

The results suggest that chalcopyrite is passivated by a thin ( <1 μm) copper-rich surface layer which forms as a result of solid state changes that occur in the mineral during leaching.

Bioleaching of copper from chalcopyrite ore by fungi

2016-7-20 · Significant leaching of copper from chalcopyrite was achieved upto 0.15 mm, with further increase in the particle size there was a gradual decrease in the copper leaching and only 30-40% leaching was achieved at 0.6 mm. Sugars are the best source of organic carbon and energy. The influence of different sugars (glucose,

Solvometallurgical process for extraction of copper from ...

for copper extraction from chalcopyrite, which can be applied to low grade copper ores due to the lower operating costs.2 Many works have been reported for hydrometallurgical leaching of chalcopyrite. The most often used lixiviants are acidic chloride media, acidic sulfate media and basic ammonia solutions, together with various oxidizing ...

Effect of Ultrasound on the Oxidative Copper Leaching …

2021-8-2 · The objective of this study is to compare the reaction kinetics of copper leaching from chalcopyrite in acidic ferric sulfate media with (UAL) and without (non-UAL) ultrasound assistance. Four leaching parameters were evaluated and optimized. The parameter with the strongest effect was temperature, followed by ultrasonic power, the solid-to-liquid ratio (S/L), and acid concentration.

Extraction of copper from chalcopyrite with potassium ...

2021-9-7 · Developing new and sustainable leaching system with limited release of pollutant and low acid and energy consumption is a challenge for copper extraction from chalcopyrite. In this work, a hydrometallurgical process for chalcopyrite dissolution in 1 ...

Recovery of copper from chalcopyrite utilizing copper ...

Copper is recovered from chalcopyrite by means of a pollution-free hydrometallurgical process which entails leaching and converting the chalcopyrite with copper sulfate in order to produce an insoluble copper sulfide, a soluble iron sulfate and sulfuric acid.

Comparison of various extractants for recovery of …

2021-9-7 · Comparison of various extractants for recovery of Copper from Sarcheshmeh Chalcopyrite concentrate Ammonia/Ammonium Carbonate Leaching M. Ghanbari1, H. Naderi1* and M. Torabi2 1. Mining and Metallurgical Engineering Department, Yazd University, Yazd, Iran 2. Research & Development Division, Sarcheshmeh Copper Complex, Kerman, Iran

BACTERIAL LEACHING OF COPPER FROM LOW GRADE …

This organism was used for leaching out the copper from low grade chalcopyrite ore which contained 0·6 per cent copper. The copper contents of the samples of low grade chalcopyrite ore ranged from 0·2 to O· 8 per cent. Sporadic deposits of higher grade copper ores also occur at Ingal­ dhal; the copper contents of such ores ranged from 1·8 ...

Improving of copper extraction from chalcopyrite by using ...

2018-5-5 · A case of ferrous sulfate addition enhancing chalcopyrite leaching [J]. Hydrometallurgy, 1997, 47: 37–45. Article Google Scholar [2] ARBITER N, MCNULTY T. Ammonia leaching of copper sulfide concentrates [C]// Copper 99-Proceedings of the

Copper leaching from chalcopyrite concentrates

Chalcopyrite (CuFeS 2 ) 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 ...

US7686866B2

A process for recovering copper from chalcopyrite is disclosed. The process includes oxidising sulphur in chalcopyrite with a solution under predetermined contact conditions and thereby releasing at least part of the copper in the chalcopyrite into the solution as copper ions. The process includes a subsequent step of reducing sulphur in a solid product from step (a) to a minus two, ie ...

(PDF) Copper Leaching from Nanoparticles of Chalcopyrite ...

Abstract: Chalcopyrite concentrate as huge source of copper has some difficulties in the leaching process due to formation of the product layer through the leaching especially in sulphate media.

A conceptual process for copper extraction from ...

2007-6-1 · The dissolution of copper from chalcopyrite was investigated in the presence of hydrogen peroxide and ethylene glycol. Hydrogen peroxide was used as oxidant in the leaching process. Addition of a small amount of ethylene glycol significantly improved the copper dissolution. The copper leaching mechanism was established by examining the ...

A conceptual process for copper extraction from ...

2017-7-1 · 1. Introduction1.1. Background to chalcopyrite leaching. The objective of this research was to evaluate a proposed conceptual flowsheet for the leaching of chalcopyrite using aqueous glycine in an alkaline environment with a suitable oxidant, and to identify potentially feasible routes for copper recovery from such a pregnant leach solution with concomitant reagent regeneration.

Hydrometallurgical Production of Copper From Flotation ...

kinetics of chalcopyrite dissolution by simultaneous grind­ ing and ferric sulfate leaching in the turbomill. The So 3 barrier would be ground from the chalcopyrite during leaching in the turbomill, exposing fresh chalcopyrite surface and enhancing the leaching rate. After leaching,

Comparative Leaching Study on Conichalcite and ...

2019-4-5 · Keywords: conichalcite, chalcopyrite, leaching, hydrogen peroxide 1. INTRODUCTION In 2015, the copper recovered by leaching accounts for 43% of total copper production in the US [1]. The hydrometallurgical process for copper recovery is well developed over

[PDF] LEACHING KINETICS OF COPPER FROM …

Treating chalcopyrite flotation concentrates by hydrometallurgical techniques seems to be the most convenient method for leaching copper due to concerns over air pollution and regulations regarding the emission of sulfur dioxide that result from smelting. In this study, the leaching recovery-time trajectories of bulk chalcopyrite concentrate obtained from a flotation plant in the Kastamonu ...

Leaching of Copper Sulphides

2016-6-8 · bornite and chalcopyrite (Cu 5 FeS 4 and CuFeS 2, respectively) as well as copper sulphides, such as chalcocite, digenite and covellite (Cu 2 S, Cu 9 S 5 and CuS, respectively). LEACHING OPTIONS Three copper sulphide leaching processes are discussed in …

Investigating the Leaching Behavior of Copper from ...

Also, the higher dissolution rates of copper from chalcopyrite can be because of the formation of copper-chloro complexes (Cu+, Cu2+ complexes Keywords:Copper leaching, Chalcopyrite concentrate, HydroCopper® process, Cupric chloride, D-optimal design (DOD). solid ratio of 6.8 mL/g, CuCl 2 concentration of 21.79 g/L and leaching time of ~8 h.