Leaching Of Chalcopyrite

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Chalcopyrite Leaching - Metallurgist & Mineral Processing ...

Leaching Chalcopyrite is the holy grail for hydrometallurgists (Leachers), difficult to leach as the sulfur forms a layer over the mineral and makes the leaching slow. Having said that, it is not 100% not leachable, not unusual for ore dumps (low grade) containing chalcopyrite to be placed under leach but report low recovery +/-30% TCu over several years and the rate is around 0.5-1% per month ...

Chalcopyrite leaching: The rate controlling factors ...

15-05-2010· The processes that determine the rate of chalcopyrite leaching are central to understanding how chalcopyrite (CuFeS 2) behaves under the environmentally adverse conditions of acid rock drainage.To this end the effect of the acid anion on chalcopyrite leach rates using a variety of acidic media (H 2 SO 4, HClO 4, HCl and H 2 SO 4 with 0.25 M NaCl) under carefully controlled …

Leaching of chalcopyrite with ferric ion. Part III: Effect ...

01-08-2008· Chalcopyrite leaching requires almost five times less activation energy with catalysis (29.25 kJ/mol) than without (130.7 kJ/mol). This means that silver ions improve the electrical conductivity of the system. • The factor controlling silver-catalyzed chalcopyrite leaching are mixed: electrochemical, chemical and diffusion.

LEACHING OF CHALCOPYRITE CONCENTRATE IN HYDROGEN …

Leaching of chalcopyrite concentrate in hydrogen peroxide solution 659 Material and methods Material Samples of the chalcopyrite concentrate were taken from the Menka Flotation Plant (Sivas, Turkey), where the CuFeS 2–PbS–ZnS complex ore is enriched. …

Enhancing the Leaching of Chalcopyrite Using ...

Chalcopyrite is the richest copper sulfide mineral in the world, but it is also the most resistant to biohydrometallurgical processing. To promote the bioleaching of chalcopyrite, a nonionic surfactant, t-octyl phenoxy polyethoxy ethanol (Triton X-100), was employed in this paper. Action of Triton X-100 in chalcopyrite leaching using Acidithiobacillus ferrooxidans was explored in shake flasks.

Bacterial and chemical leaching of chalcopyrite ...

10-11-2014· In their review on chalcopyrite leaching, Debernardi and Carlesi (2013) focused on the semiconductor properties of chalcopyrite. The charge excess created during the oxidation of chalcopyrite is distributed within a thin surface space charge region, and this changes the energy level of conduction and valence bands and generates a decrease in the potential that hinders the …

Kinetic Study of Chalcopyrite Leaching with Iron (III ...

Kinetic study of chalcopyrite leaching with iron (III) chloride in methane-sulfonic acid. The increasing rigour of environmental standards for copper extraction and the problems associated with the most common lixiviants used in chalcopyrite leaching make necessary to investigate solutions with less environmental impact.

(PDF) LEACHING OF CHALCOPYRITE CONCENTRATE …

The leaching conditions of chalcopyrite (CuFeS 2) concentrate taken from Koyulhisar (Sivas, Turkey) in a nitric acid medium were investigated by studying the effects of its leaching parameters ...

Thermophilic Bioheap Leaching of Chalcopyrite Concentrates

The chalcopyrite quickly becomes passivated and unacceptable copper extractions are achieved. It was not until the adoption of thermophilic systems that the biological leaching of chalcopyrite became a reality. There are several stirred tank processes currently being put forward for the biological extraction of copper from chalcopyrite including

Leaching of Primary Copper Sulfide Ore in Chloride-Ferrous ...

chalcopyrite may be in between the passive and active state, depending on the form at which that potential was reached. At 755 mV (SHE) the leaching of chalcopyrite becomes slow due to the effect of passivation [28]. Sandström et al. [29] suggested that chalcopyrite leaching should be carried out in

The leaching of chalcopyrite with ferric sulfate ...

The apparent activation energy for chalcopyrite leaching was found to range from 76.8 to 87.7 kJ mol −1, and this suggests that the leaching of chalcopyrite is chemically controlled. The leaching rate of chalcopyrite increases with an increase in Fe(SO 4 ) 1.5 concentration up to 0.1 mol dm −3 , but a further increase of the Fe(SO 4 ) 1.5 concentration has little effect on the leaching rate.

Enhancing the Leaching of Chalcopyrite Using ...

Chalcopyrite is the richest copper sulfide mineral in the world, but it is also the most resistant to biohydrometallurgical processing. To promote the bioleaching of chalcopyrite, a nonionic surfactant, t-octyl phenoxy polyethoxy ethanol (Triton X-100), was employed in this paper. Action of Triton X-100 in chalcopyrite leaching using Acidithiobacillus ferrooxidans was explored in shake flasks.

Comparative Leaching of Chalcopyrite by Selected ...

A systematic study of the bioleaching of chalcopyrite (CuFeS 2 ) was conducted using axenic cultures of 11 species of acidophilic Bacteria and Archaea to obtain a direct comparison of the microbial chalcopyrite leaching capabilities of the different cultures and to …

(PDF) LEACHING OF CHALCOPYRITE CONCENTRATE …

The leaching conditions of chalcopyrite (CuFeS 2) concentrate taken from Koyulhisar (Sivas, Turkey) in a nitric acid medium were investigated by studying the effects of its leaching parameters ...

(PDF) Leaching of chalcopyrite with hydrogen peroxide in ...

During the chalcopyrite leaching with potassium dichromate in sulfuric acid solution, Aydogan et al. [24] showed that chalcopyrite dissolution increased up to 400 rpm stirring speed, and after ...

Leaching of chalcopyrite with sodium hypochlorite - …

Chalcopyrite is the most important copper mineral source and also a refractory mineral for leaching. Several processing routes have been proposed to overcome the environmental problems related to copper extraction from chalcopyrite. In this study, the leaching of chalcopyrite has been investigated with a new reagent sodium hypochlorite (NaOCl).

Kinetic Study of Chalcopyrite Leaching with Iron (III ...

Kinetic study of chalcopyrite leaching with iron (III) chloride in methane-sulfonic acid. The increasing rigour of environmental standards for copper extraction and the problems associated with the most common lixiviants used in chalcopyrite leaching make necessary to investigate solutions with less environmental impact.

(PDF) Leaching of Chalcopyrite in Acidified Nitrate Using ...

The leaching of copper from industrial copper ore with 4.8 wt % chalcopyrite by acidified nitrate with seawater based media was investigated. Water quality (pure water and seawater), temperature ...

Thermophilic Bioheap Leaching of Chalcopyrite Concentrates

The chalcopyrite quickly becomes passivated and unacceptable copper extractions are achieved. It was not until the adoption of thermophilic systems that the biological leaching of chalcopyrite became a reality. There are several stirred tank processes currently being put forward for the biological extraction of copper from chalcopyrite including

Leaching of Primary Copper Sulfide Ore in Chloride-Ferrous ...

chalcopyrite may be in between the passive and active state, depending on the form at which that potential was reached. At 755 mV (SHE) the leaching of chalcopyrite becomes slow due to the effect of passivation [28]. Sandström et al. [29] suggested that chalcopyrite leaching should be carried out in

Enhancing the Leaching of Chalcopyrite Using ...

Chalcopyrite is the richest copper sulfide mineral in the world, but it is also the most resistant to biohydrometallurgical processing. To promote the bioleaching of chalcopyrite, a nonionic surfactant, t-octyl phenoxy polyethoxy ethanol (Triton X-100), was employed in this paper. Action of Triton X-100 in chalcopyrite leaching using Acidithiobacillus ferrooxidans was explored in shake flasks.

Comparative Leaching of Chalcopyrite by Selected ...

A systematic study of the bioleaching of chalcopyrite (CuFeS 2 ) was conducted using axenic cultures of 11 species of acidophilic Bacteria and Archaea to obtain a direct comparison of the microbial chalcopyrite leaching capabilities of the different cultures and to …

Leaching of chalcopyrite in cupric chloride solution

1 Leaching of chalcopyrite in cupric chloride solution Mari Lundströma*, Jari Aromaaa, Olof Forséna, Olli Hyvärinenb and Michael H. Barkerb. a Helsinki University of Technology, Laboratory of Corrosion and Material Chemistry, P.O. Box 6200, 02015 HUT, Finland b Outokumpu Research Oy, Kuparitie 10, P.O. Box 60, 28101 Pori, Finland * Corresponding Author

Thermophilic Bioheap Leaching of Chalcopyrite Concentrates

The chalcopyrite quickly becomes passivated and unacceptable copper extractions are achieved. It was not until the adoption of thermophilic systems that the biological leaching of chalcopyrite became a reality. There are several stirred tank processes currently being put forward for the biological extraction of copper from chalcopyrite including

Kinetic Study of Chalcopyrite Leaching with Iron (III ...

Kinetic study of chalcopyrite leaching with iron (III) chloride in methane-sulfonic acid. The increasing rigour of environmental standards for copper extraction and the problems associated with the most common lixiviants used in chalcopyrite leaching make necessary to investigate solutions with less environmental impact.

Leaching of Chalcopyrite in Acidified Nitrate Using ...

Leaching of Chalcopyrite in Acidified Nitrate Using Seawater-Based Media Pía C. Hernández 1,* ID, María E. Taboada 1,2, Osvaldo O. Herreros 3, Teófilo A. Graber 1,2 and Yousef Ghorbani 4 ID 1 Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Avda.

The leaching of chalcopyrite with ferric sulfate - NASA/ADS

The leaching kinetics of natural chalcopyrite crystals with ferric sulfate was studied. The morphology of the leached chalcopyrite and the electrochemical properties of chalcopyrite electrodes also were investigated. The leaching of chalcopyrite showed parabolic-like kinetics initially and then showed linear kinetics. In the initial stage, a dense sulfur layer formed on the chalcopyrite surface.

Leaching of Primary Copper Sulfide Ore in Chloride-Ferrous ...

chalcopyrite may be in between the passive and active state, depending on the form at which that potential was reached. At 755 mV (SHE) the leaching of chalcopyrite becomes slow due to the effect of passivation [28]. Sandström et al. [29] suggested that chalcopyrite leaching should be carried out in

LEACHING KINETICS OF COPPER FROM CHALCOPYRITE …

leaching product on the mineral surface, as confirmed using XRD and SEM/EDX. The semi-empirical equation explaining the reaction rate under the present conditions was expressed as follows: X X t C e T 4096.7 0,83 0 0.96 NaNO 4 3 2 2 1 56.53 10 3 2 1 J. Keywords: chalcopyrite, pressure leaching, nitrogen species, kinetics Introduction

Chalcopyrite Leaching by Thermophilic Bacteria

Hydrometallurgy offers innovations in copper dump leaching, new developments in in-situ leaching of copper and heap-leaching uranium and improved schemes for leaching of metal concentrates. Although increased research effort has produced techniques which are now commonly used in extraction of copper and uranium, techniques for extraction of recalcitrant chalcopyrite have not been refined.