The role of sodium chloride on surface properties of chalcopyrite leached with ferric sulphate

Carneiro, Maria Fernanda Coimbra; Leão, Versiane Albis

doi:10.1016/j.hydromet.2007.01.005

Cited by 110 publications

(71 citation statements)

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“…This would change the kinetic behaviour to that described by a shrinking core model: 1-3(1-X) 2/3 + 2(1-X) = 6 CDr o -2 ρ -1 t, where D = diffusion coefficient of reactant or product (m 2 s -1 ) through a porous solid on the surface. For example, Carneiro and Leao (2007) showed the validity of this model for the leaching of chalcopyrite by ferric sulfate in non-chloride solutions. Bertram and Hillrichs (1981) noted that the adsorption of metastable copper oxides (hydroxides) as well as a product layer of S/CuO (Fig.…”

Section: Factors Affecting Apparent Rate Constantsmentioning

confidence: 96%

“…The beneficial effect of low chloride addition for the leaching of copper-nickel sulfides in sulfate systems, previously reported by Subramanian and Ferrajuolo (1976), has also attracted renewed interest in atmospheric and pressure oxidation processes for a range of sulfides (Lu et al, 2000a,b;Deng et al, 2001;Berezowsky and Trytten, 2002;Peacy et al, 2003;Ferron et al, 2003;Kinnunen and Puhakka, 2004;McDonald and Muir, 2007a,b;Carneiro and Leao, 2007). For example, low chloride has a beneficial effect upon the acid-pressure leaching of copper and nickel from finely ground sulfide concentrates in the ACTIVOX process (Johnson and Streltsova, 1999).…”

Section: Introductionmentioning

confidence: 94%

“…3 Despite some detailed studies, reasons for the beneficial role of low chloride in sulfide leaching in sulfate systems remain unresolved (Cheng and Lawson, 1991a,b;Fisher et al, 1992;Kinnunen and Puhakka, 2004;Brown and Papangelakis, 2005;Carneiro and Leao, 2007). The general view is that during atmospheric leaching in the presence of sodium chloride in sulfuric acid, a porous and somewhat crystalline sulfur layer is formed on the sulfide surface, instead of a tight passivating sulfur layer which blocks the surface Lawson, 1991a, Muir andHo, 2006;Carneiro and Leao, 2007).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…The general view is that during atmospheric leaching in the presence of sodium chloride in sulfuric acid, a porous and somewhat crystalline sulfur layer is formed on the sulfide surface, instead of a tight passivating sulfur layer which blocks the surface Lawson, 1991a, Muir andHo, 2006;Carneiro and Leao, 2007). Elemental sulfur formed during the leaching of chalcopyrite with ferric chloride is also more porous than that formed with ferric sulfate, thus the leaching rate is an order of magnitude larger in the former (Majima et al, 1985).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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A review of chloride assisted copper sulfide leaching by oxygenated sulfuric acid and mechanistic considerations

Senanayake

2009

Hydrometallurgy

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Please cite this article as: Senanayake, G., A review of chloride assisted copper sulfide leaching by oxygenated sulfuric acid and mechanistic considerations, Hydrometallurgy (2009), doi: 10.1016/j.hydromet.2009.02.010 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T AbstractThe beneficial effect of chloride on sulfide leaching in sulfuric acid has been widely reported over the last 3 to 4 decades but the reasons have not been resolved. A review of recent literature shows that sulfide leaching is complex due to alternative reaction paths, competitive reactions and interim compounds formed on solid surfaces or in solutions. This study focuses on analysis of rate data for covellite leaching by oxygenated sulfuric acid in the presence of sodium chloride and comparison with the leaching data of chalcocite. The published results for initial copper leaching from covellite are analysed on the basis of a shrinking particle kinetic model to determine the apparent rate constants and reaction orders with respect to the concentrations of chloride, dissolved oxygen, and hydrogen ions. The first stage leaching of chalcocite to an intermediate CuS appears to be controlled by the mass transport of oxygen to the sulfide surface. A comparison has been made between the second stage leaching of chalcocite and the initial leaching of pure covellite to produce elemental sulfur by considering the effect of temperature on dissolved oxygen concentration and apparent rate constants. The Arrhenius plots gave comparable values for activation energy for covellite (101 kJ. mol -1 ) and second stage leaching of chalcocite (96 kJ mol -1 ). A linear correlation of stability constants was used to determine equilibrium constants for the formation of CuS 2 and Cu(OH)(Cl). The peak potentials of voltammograms of covellite are in reasonable agreement with the predicted potentials based on thermodynamics of a range of solid phases including CuS, CuS 2 , Cu(OH)Cl, and Cu 2 Cl(OH) 3 . These observations are used to propose a reaction mechanism via mixed-ligand complex species.

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Section: Factors Affecting Apparent Rate Constantsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 94%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

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A review of chloride assisted copper sulfide leaching by oxygenated sulfuric acid and mechanistic considerations

Senanayake

2009

Hydrometallurgy

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“…더미 용출에서 Cu 용출률을 향상시키기 위하여 NaCl을 첨가하는 방법 (Carneiro and Leao, 2007;van Hille et al, 2010), 용출-용액의 균일 침투 흐 름을 유도하는 덩어리 형성 (Dhawan et al, 2013) 등이 연구되었다.…”

Section: 유용금속 용출 및 맥석광물의 용해 특성unclassified

The Characteristic Dissolution of Valuable Metals from Mine-Waste Rock by Heap Bioleaching, and the Recovery of Metallic Copper Powder with Fe Removal and Electrowinning

Kim¹,

Cho²,

Choi³

et al. 2014

Journal of the Mineralogical Society of Korea

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: In order to recover the metallic copper powder from the mine-waste rock, heap bioleaching, Fe removal and electrowinning experiments were carried out. The results of heap leaching with the mine-waste rock sample containing 0.034% Cu showed that, the leaching rate of Cu were 61% and 62% in the bacteria leaching and sulfuric acid leaching solution, respectively. Sodium hydroxide (NaOH), hydrogen peroxide (H 2 O 2 ) and calcium hydroxide (Ca(OH) 2 ) were applied to effectively remov Fe from the heap leaching solution, and then H 2 O 2 was selected for the most effective removing Fe agent. In order to prepare the electrolytic solution, H 2 O 2 were again treated in the heap leaching, and Fe removal rates were 99% and 60%, whereas Cu removal rates were 5% and 7% in the bacteria and *Corresponding author: +82-62-230-7878, E-mail: cybpark@chosun.ac.kr 김봉주⋅조강희⋅최낙철⋅박천영 -208 -sulfuric acid leaching solutions, respectively. After electrowinning was examined in these leaching solution, the recovery rates of Cu were obtained 98% in bacteria and obtained 76% in the sulfuric leaching solution. The dendritic form of metallic copper powder was recovered in both leaching solutions.

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Sodium Chloride

Götzfried,

Beraud

2023

Ullmann's Encyclopedia of Industrial Chemistry

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The role of sodium chloride on surface properties of chalcopyrite leached with ferric sulphate

Cited by 110 publications

References 27 publications

A review of chloride assisted copper sulfide leaching by oxygenated sulfuric acid and mechanistic considerations

A review of chloride assisted copper sulfide leaching by oxygenated sulfuric acid and mechanistic considerations

The Characteristic Dissolution of Valuable Metals from Mine-Waste Rock by Heap Bioleaching, and the Recovery of Metallic Copper Powder with Fe Removal and Electrowinning

Sodium Chloride

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