Kinetics of chalcopyrite leaching by sodium nitrate in sulphuric acid

Sokić, Miroslav; Marković, Branislav; Živković, Dragana

doi:10.1016/j.hydromet.2008.06.012

Cited by 176 publications

(107 citation statements)

References 33 publications

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“…Fe 3+ can also form via oxidation of Fe 2+ by iron-oxidising microorganisms [4,5,[58][59][60][61][62][63][64][65][66][67][68] or due to the presence of other oxidants such as H2O2 [23,24,69]. Previous publications have discussed factors affecting chalcopyrite leaching with effects from temperature, pH and Fe 3+ having been considered [2,5,11,19,24,26,33,70]. The empirical dissolution rate law applied by Kimball et al [4] for the relative surface area normalised leach rates is shown in Equation (5) which can be converted to Equation (6) when a log scale is applied.…”

Section: Kinetic Analysis By Multiple Linear Regression (<10% Cu Extrmentioning

confidence: 99%

“…Non-oxidative chalcopyrite leach mechanisms [4,5,19], which involve the consumption of H + can be neglected due to the oxidising conditions applied here. Hence, H + consumption is likely to occur primarily in conjunction with Fe 2+ oxidation (Equation (11)) when significant aqueous iron is present in solution.…”

Section: Identification Of Reactions and Mechanismsmentioning

confidence: 99%

“…Chalcopyrite is one of the most difficult minerals to process economically [6] with Cu primarily produced pyrometallurgically. However, a great deal of attention has been paid to the development of hydrometallurgical processing routes [5][6][7][8][9][10][11][12][13][14][15][16][17] due to the potentially attractive economics, especially when chalcopyrite is present at a low grade, and reduced environmental impact [18,19]. However, the extremely slow dissolution rate continues to limit implementation of hydrometallurgical extraction strategies [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Wei

Qian

et al. 2016

Minerals

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Abstract:To better understand chalcopyrite leach mechanisms and kinetics, for improved Cu extraction during hydrometallurgical processing, chalcopyrite leaching has been conducted at solution redox potential 750 mV, 35-75˝C, and pH 1.0 with and without aqueous iron addition, and pH 1.5 and 2.0 without aqueous iron addition. The activation energy (E a ) values derived indicate chalcopyrite dissolution is initially surface chemical reaction controlled, which is associated with the activities of Fe 3+ and H + with reaction orders of 0.12 and´0.28, respectively. A surface diffusion controlled mechanism is proposed for the later leaching stage with correspondingly low E a values. Surface analyses indicate surface products (predominantly S n 2´a nd S 0 ) did not inhibit chalcopyrite dissolution, consistent with the increased surface area normalised leach rate during the later stage. The addition of aqueous iron plays an important role in accelerating Cu leaching rates, especially at lower temperature, primarily by reducing the length of time of the initial surface chemical reaction controlled stage.

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Section: Kinetic Analysis By Multiple Linear Regression (<10% Cu Extrmentioning

confidence: 99%

Section: Identification Of Reactions and Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Wei

Qian

et al. 2016

Minerals

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“…Of these models, the previously established shrinking-core model plays an important role in the fluid-solid system and has been applied in the study of leaching for various sulfides [34][35][36][37][38][39][40][41]. Therefore, the shrinking-core model was applied to describe the leaching kinetics for this experiment.…”

Section: Kinetics Of Copper Leaching For the Mechanically Activated Cusmentioning

confidence: 99%

Effect of Mechanical Activation on the Kinetics of Copper Leaching from Copper Sulfide (CuS)

Lee

Kim

et al. 2018

Metals

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Abstract:The effect of mechanical activation on the copper leaching of copper sulfide, CuS, in 1 M HNO 3 (slurry density: 10 g/L) was investigated by analysis of the leachability and the apparent activation energy. Mechanical activation produced an increase in the leachability and a decrease of the activation energy in this leaching reaction. The leachability increased proportionally to the degree of mechanical activation, reaching 96.6% leaching within 60 min at 80 • C from CuS ground at 700 rpm for 15 min. This leaching process was controlled by surface chemical reaction following the shrinking-core model. The apparent activation energy of leaching for CuS (71.5 kJ/mol) in the range of 50 to 80 • C decreased with an increase of the degree of mechanical activation, reaching 44.3 kJ/mol for Cu leaching from CuS ground at 700 rpm for 15 min.

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“…Ferric and cupric ions, bacteria, oxygen, and other oxidants have been used as leaching agents of sulphide in sulphate and chloride media under atmospheric or pressure leaching conditions [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Complex sulphide-barite ore leaching in ferric chloride solution

Sokić¹,

Matković²,

Marković³

et al. 2016

Metall Mater Eng

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The results of research on the leaching process of complex sulphide-barite ore were presented in this paper. The leaching process was carried out in a laboratory autoclave by ferric chloride solution. Considering that those minerals are represented in complex structural-textural relationships, it is not possible to extract lead, zinc and copper minerals from ore by flotation methods. The obtained results confirmed possibility of the ore processing directly, by chemical methods. The effect of temperature, time and oxygen partial pressure on the lead, zinc and copper dissolution was studied. The maximal leaching degree was achieved at 100 C and amount of 91.5 % for Pb, 96.1 % for Zn and 60.7 % for Cu). Leaching at temperatures above 100 C is impractical.

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Kinetics of chalcopyrite leaching by sodium nitrate in sulphuric acid

Cited by 176 publications

References 33 publications

Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Effect of Mechanical Activation on the Kinetics of Copper Leaching from Copper Sulfide (CuS)

Complex sulphide-barite ore leaching in ferric chloride solution

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