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

Atmospheric leaching of chalcopyrite in the presence of

01.11.2019· Chalcopyrite, CuFeS 2 is the most important mineral of copper, but it is a refractory mineral and does not easily dissolve in various leaching solutions. In the present work, sulfuric acid solution containing hydrogen peroxide as the oxidant was used for leaching of chalcopyrite at ambient pressure and temperatures up to 65 °C.

Enhancing the Leaching of Chalcopyrite Using

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.

LEACHING OF CHALCOPYRITE CONCENTRATE IN HYDROGEN

Leaching of chalcopyrite concentrate in hydrogen peroxide solution 663 Fig. 6. Microscopic photograph of chalcopyrite concentrate after hydrogen peroxide leaching Conditions: 3.0 M H 2 O 2, 40°C, 2 g/cm 3 (75x53 µm) chalcopyrite concentrate, no stirring Fig. 7. XRD patterns for a pyrite concentrate before (SA3) and after (SA4) the leaching During the leaching, a clear pH decrease was

Determining the Chalcopyrite Leaching Method Using

This processing, until obtaining metallic copper as a cathode, is very expensive, being the leaching of chalcopyrite an alternative to extract it by electrowinning at a lower industrial cost. Chalcopyrite is one of the most difficult copper minerals to leach, being possible to generate a PLS in a very oxidizing medium, but recoveries are too low to consider it as a processing alternative

Mixed Potential Plays a Key Role in Leaching of

The mixed potential plays a key role in leaching of chalcopyrite. Therefore, the impact of Fe 2+ and Fe 3+ on chalcopyrite leaching was investigated in this work. Simultaneously, the chalcopyrite passive film was studied by applying cyclic voltammetry (CV), potentiodynamic, potentiostatic, and Tafel polarization.

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.

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

LEACHING KINETICS OF COPPER FROM CHALCOPYRITE

In this study, the leaching recovery-time trajectories of bulk chalcopyrite concentrate obtained from a flotation plant in the Kastamonu region of Turkey are presented. The effects of various parameters were elucidated in the nitrous-sulfuric acid electrolyte (C NaNO2 :0.05 M–0.15 M, C

Leaching of Primary Copper Sulfide Ore in Chloride-Ferrous

The leaching of chalcopyrite at high potentials (high ferric concentration) has been questioned because some studies have shown that ferric ions inhibit the leaching of chalcopyrite while ferrous ions increase its leaching kinetics. Kametani and Aoki established a critical reduction potential

The leaching of a chalcopyrite concentrate in ammonia

The rate of dissolution of a chalcopyrite concentrate was measured in ammoniacal solutions under oxygen pressure for conditions when chemical reaction rate controlled. Temperatures from 50°‐95°C, oxygen pressures to 689 kPa and ammonia concentrations from 2.5 to 7.0 mol/ l were investigated.

Heap Leaching of Chalcopyrite Copper Physical

Chalcopyrite, CuFeS 2, is the most important copper-bearing mineral in the world and unlike many other ores it is known to be recalcitrant to hydrometallurgical processing. The main hindrance to the commercial applica- tion of biohydrometallurgical processing of chalcopyrite is its slow rate of dissolution. In this piece of review work, the microbiological and other important aspects of

In Situ Electrochemical Investigation of Pyrite Assisted

30.11.2019· An improvement in chalcopyrite leaching kinetics of up to 9 times can be obtained through exploiting galvanic interaction in chalcopyrite leaching. The results corresponded with the leaching results reported by Mehta and Murr, 5,6 they found that the leaching rates reached 2 to 15 times in chalcopyrite leaching when pyrite was added. Zoom In Zoom Out Reset image size Figure 2.

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).

LEACHING KINETICS OF COPPER FROM CHALCOPYRITE

Keywords: chalcopyrite, pressure leaching, nitrogen species, kinetics Introduction Concerns over air pollution and strict environmental regulations regarding the emission of sulfur dioxide, combined with the increased demand of treating complex chalcopyrite ores and concentrates with high recoveries, have led to the development of hydrometallurgical processes as alternatives to smelting

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.

For oxidative leaching of chalcopyrite with dissolved

Corpus ID: 30795911. For oxidative leaching of chalcopyrite with dissolved oxygen and ferric ions in sulfate media @inproceedings{Lu2016ForOL, title={For oxidative leaching of chalcopyrite with dissolved oxygen and ferric ions in sulfate media}, author={Diankun Lu and W. Wang and Y. Chang and Feng Xie and Kaixi Jiang}, year={2016} }

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.

Kinetic study of sulfide leaching by galvanic interaction

Lasse Ahonen, Olli H. Tuovinen, Catalytic effects of silver in the microbiological leaching of finely ground chalcopyrite-containing ore materials in shake flasks, Hydrometallurgy, 10.1016/0304-386X(90)90088-J, 24, 2, (219-236), (1990). Crossref. N. Jyothi, K.N. Sudha, K.A. Natarajan, Electrochemical aspects of selective bioleaching of sphalerite and chalcopyrite from mixed sulphides

Leaching of Primary Copper Sulfide Ore in Chloride-Ferrous

Many chalcopyrite leaching studies have been performed with leachants such as ferric sulfate [4–7], ferric chloride [7,8], sodium nitrate-sulfuric acid [9], hydrochloric acid [10], and sodium chloride-sulfuric acid [11], among others [10]. The slow copper from chalcopyrite dissolution has been attributed to the formation of a passivating layer on the mineral surface. This phenomenon has been

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 with Sodium Hypochlorite

The leaching rate of chalcopyrite in the first stage was controlled by a chemical reaction with the activation energy of 50.2 kJ/mol (12.0 kcal/mol). A leaching scheme was identified in which 98 pct of the chalcopyrite was leached by adding hypochlorite stock solution stepwise in less than 3 hours. Autoren: Ravinder K. Garlapalli, Eung Ha Cho, Ray Y.K. Yang : Journal: Metallurgical and

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).

The leaching of chalcopyrite with cupric chloride

A comparative study of electrochemical leaching and chemical leaching of chalcopyrite was performed mainly at 343 K to elucidate the leaching mechanism of chalcopyrite with CuCl 2 . Also, the morphology of the leached chalcopyrite surface was studied by using a single chalcopyrite crystal. The leaching with CuCl 2 produced a porous elemental sulfur layer on the chalcopyrite surface, showing a

Comparative Leaching of Chalcopyrite by Selected

The characteristics of chalcopyrite leaching by the moderate thermophile Sulfobacillus thermosulfidooxidans,the mesophile Acidithiobacillus ferrooxidans,and the thermophile Acidianus brierleyi were used to elucidate the leaching process. Moderately thermophilic cultures of Sulfobacillus acidophilus, Acidimicrobium ferrooxidans,and Acidithiobacillus caldus were used to study the effects

Leaching of Chalcopyrite with Thiobacillus ferrooxidans

The rate of leaching of chalcopyrite by Thiobacillus ferrooxidans has been greatly accelerated by using shaken flasks in place of stationary bottles or percolators. A further increase in rate and extent of leaching was obtained by the use of Tween 20, 40, 60, and 80, Triton X-100, Quaker TT 5386, and Hyamine 2389. Tween 20 was the most effective surfactant. No individual component of the Tween

Leaching of chalcopyrite in cupric chloride solution

Keywords: Chalcopyrite, leaching of chalcopyrite, cupric chloride, sodium chloride, HydroCopperTM ABSTRACT Outokumpu HydroCopperTM technology was developed by Outokumpu Research. It is a novel copper production method based on the efficient leaching properties of cupric chloride solutions. The leaching is operated at atmospheric pressure, near the boiling point of water in a stirred reactor

Reconstruction of the Chalcopyrite Surfaces—A DFT Study

Leaching of chalcopyrite: An emphasis on effect of copper and iron ions. Journal of Central South University 2018, 25 (10),2380-2386. DOI: 10.1007/s11771-018-3922-5. Yubiao Li, Zhenlun Wei, Qing Xiao, Huimin Gao, Shaoxian Song. A fundamental DFT study of chalcopyrite surface evolution due to impurity divalent ions during leaching process. Minerals Engineering 2018, 121, 205-211. DOI:

THE KINETICS OF THE DISSOLUTION OF CHALCOPYRITE IN

OF LEACHING OF CHALCOPYRITE 142 5.1 Introduction 142 5.2 Electrochemical control of the potential 147 5.3 Control of the potential by oxygen addition 150 5.4 Dissolution of chalcopyrite concentrates from different sources 151 5.4.1 Mineral particle size distribution 155 5.4.2 Leaching experiments within the optimal potential window 157 5.5 Effect of low potentials 161 5.6 Recovery 170

Determining the Chalcopyrite Leaching Method Using

This processing, until obtaining metallic copper as a cathode, is very expensive, being the leaching of chalcopyrite an alternative to extract it by electrowinning at a lower industrial cost. Chalcopyrite is one of the most difficult copper minerals to leach, being possible to generate a PLS in a very oxidizing medium, but recoveries are too low to consider it as a processing alternative

Ferric Chloride Leaching of Copper from Chalcopyrite in

Leaching of chalcopyrite with ferric ion Part I General. Aug 01 2008 · Sullivan concluded that ferric chloride is a better chalcopyrite leaching agent than ferric sulphate and that the effect was more marked at high temperatures Dutrizac et al 1969 found that in a temperature range between 50 and 100 °C the chalcopyrite leaching rate was linear in chloride medium and parabolic in sulphate

The leaching of chalcopyrite with cupric chloride

A comparative study of electrochemical leaching and chemical leaching of chalcopyrite was performed mainly at 343 K to elucidate the leaching mechanism of chalcopyrite with CuCl 2 . Also, the morphology of the leached chalcopyrite surface was studied by using a single chalcopyrite crystal. The leaching with CuCl 2 produced a porous elemental sulfur layer on the chalcopyrite surface, showing a

LEACHING OF CHALCOPYRITE WITH THIOBACILLUS

LEACHING OF CHALCOPYRITE WITH THIOBACILLUS FERROOXIDANS: EFFECT OF SURFACTANTS AND SHAKING. DUNCAN DW, TRUSSELL PC, WALDEN CC. The rate of leaching of chalcopyrite by Thiobacillus ferrooxidans has been greatly accelerated by using shaken flasks in place of stationary bottles or percolators. A further increase in rate and extent of leaching was obtained by

Leaching of Chalcopyrite CORE

Leaching of Chalcopyrite . By and Rui Carnide Hasse Ferreira and Rui Carnide Hasse Ferreira. Abstract. Imperial Users onl Publisher: Department of Physical Metallurgy, Imperial College London. Year: 1972. OAI identifier: oai:spiral.imperial.ac.uk:10044/1/20376

Iodide-assisted leaching of chalcopyrite in acidic ferric

Chalcopyrite leaching in acidic ferric sulfate media at ambient temperature exhibits slow kinetics due to the formation of passivation layers on chalcopyrite surfaces. In this study, we investigated the use of potassium iodide to assist chalcopyrite leaching and proposed mechanisms by which iodide enhanced the leaching efficiency. The effect of ferric concentration, temperature and iodide

Leaching of chalcopyrite: An emphasis on effect of copper

Leaching of chalcopyrite: An emphasis on effect of copper and iron ions YANG Cong-ren(杨聪仁)1, 2, JIAO Fen(焦芬)1, 2, QIN Wen-qing(覃文庆)1, 2 1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; 2. Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South

Mineralogical Characterization of Chalcopyrite Bioleaching

However, the chalcopyrite copper leaching rate is slower than other copper minerals such as chalcocite (Cu 2 S), covellite (CuS), and bornite (Cu 5 FeS 4) . Initial rapid leaching rates decline with time, and bioleaching processes release only part of the copper due to so-called passivation reactions at the mineral surfaces [12, 13].

Bacterial leaching kinetics for copper dissolution from a

Bio-leaching of copper (0.3%) from a low grade Indian chalcopyrite ore of Malanjkhand copper mines, using a native mesophilic isolate predominantly Acidithiobacillus ferrooxidans (A.ferrooxidans), is reported. A bio-recovery of 72% Cu was recorded in the presence of this culture (not adapted), which increased to 75% with an ore adapted culture after 35 days at 35ºC and pH 2.0 with <50fim

Reductive Leaching of Chalcopyrite by Aluminum

Reductive Leaching of Chalcopyrite by Aluminum G.T. Lapidusa,b and F.M. Doylea aUniversity of California, Department of Materials Science and Engineering, 210 Hearst Mining Building, Berkeley, California 94720-1760, USA bDepto.Ingeniería de Procesos e

Determining the Chalcopyrite Leaching Method Using

This processing, until obtaining metallic copper as a cathode, is very expensive, being the leaching of chalcopyrite an alternative to extract it by electrowinning at a lower industrial cost. Chalcopyrite is one of the most difficult copper minerals to leach, being possible to generate a PLS in a very oxidizing medium, but recoveries are too low to consider it as a processing alternative