Kinetics of chalcopyrite dissolution by hydrogen peroxide in sulphuric acid

Antonijević, Milan M.; Janković, Z.; Dimitrijević, Mirjana

doi:10.1016/s0304-386x(03)00082-3

Cited by 145 publications

(91 citation statements)

References 11 publications

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“…High values obtained (Figure 3a) indicate the initial stage of chalcopyrite leaching is controlled by surface chemical reaction [4,22,23,25,43]. The values derived from leaching at pH 1.0 (with and without iron addition), 1.5 and 2.0 (without aqueous iron addition) are within the error range.…”

Section: Effect Of 4 Mmol Iron Additionmentioning

confidence: 54%

“…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].…”

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

confidence: 99%

“…Most previous studies have concluded that chalcopyrite leaching is surface chemical reaction controlled on the basis of derivation of high activation energies (E a ) [3,4,[22][23][24][25]. However, a few studies have reported that chalcopyrite leaching is surface diffusion controlled with commensurately small E a values [26].…”

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: Effect Of 4 Mmol Iron Additionmentioning

confidence: 54%

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

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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“…Hence, it could be estimated that more addition amount of hydrogen peroxide should achieve a much better copper recovery, as that was previously reported. 8) Certainly, the experiments were carried out with two particle sizes (À0:15 mm and À0:02 mm) in the 1.5 and 3.0-dose sulfuric acid containing 1.5-dose hydrogen peroxide. The effect of particle size on copper leaching is shown in Fig.…”

Section: )mentioning

confidence: 99%

Copper Leaching Behavior of Iron-Oxide Hosted Copper-Gold Ore in Sulfuric Acid Medium

et al. 2008

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Iron-oxide hosted copper-gold (IOCG) deposit is a newly recognized raw material for copper recovery. A poor understanding of its hydrometallurgical behavior has limited the development of its commercial practice for copper extraction. In this paper, the leaching behavior of IOCG ore in sulfuric acid medium containing hydrogen peroxide were studied in shaking flask and rolling-ball (RB) vessel. The dissolved copper and iron, pH and oxidation-reduction potential were monitored versus time. It was found that the IOCG ore is more difficult to leach than primary and secondary copper ores. Furthermore, some variables including sulfuric acid dosage, hydrogen peroxide addition and particle sizes were considered and investigated. The similar copper recovery was observed with the variation of the amount of sulfuric acid, and the addition of hydrogen peroxide did not enhance copper yield considerably. Although the higher copper recovery occurred with smaller particle sizes, the highest copper extraction was still not over 40% even for À0:02 mm size. The dissolved copper level behavior with time in shaking flask indicates the hindered dissolution is occurring. Moreover, more than 90% copper recovery in RB leaching confirmed the existing hindered dissolution in shaking flask. The passivation candidates of elemental sulfur was detected and confirmed by X-ray diffraction further, which were responsible for the low copper yield in shaking flask.

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“…Recently, much attention has been focused on the hydro-metallurgical route, particularly acid leaching, which suggests a viable alternative approach to extract copper from low-grade sulfide ores, complex ores and tailings [11][12][13][14] . There are many studies related to the development of hydrometallurgical routes to extract copper from low-grade sulfide ores by atmospheric leaching and biological leaching processes [15][16][17][18] . Authors have concluded that both direct atmospheric and biological leaching of copper from its ore are extremely slow due to the formation of an elemental sulfur passivation layer on the surface of unreacted particles 3 .…”

Section: Introductionmentioning

confidence: 99%

Copper Recovery from Silicate-Containing Low-Grade Copper Ore Using Flotation Followed by High-Pressure Oxidative Leaching

Han

Altansukh

Haga

et al. 2017

Resources Processing

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In this paper, we present the results for recovery of copper from silicate-containing low-grade copper ore using flotation followed by atmospheric and high-pressure oxidative leaching. The effects of various flotation parameters, such as flotation time, PAX dosage, slurry pH and air injection rate on beneficiation of copper from the low-grade copper ore were studied. The recovery of copper reached 93.1% and the grade of copper improved to 18.2 mass% from 0.4 mass% under collector-less optimum flotation conditions. The enrichment ratio of copper in the concentrate was 45. The copper concentrate obtained from flotation of the low-grade copper ore was treated by atmospheric leaching and high-pressure oxidative leaching processes. A maximum recovery (>93.0%) of copper was obtained by high-pressure oxidative leaching in the water, whereas the copper recovery was lower than 12% in the sulfuric acid solution under atmospheric leaching conditions. The copper concentration in a pregnant leach solution enriched up to 15.0 g/L under the optimized leaching conditions. The effect of impurity such as iron in the sample on the froth flotation and both leaching processes is also considered. A process flow for the recovery of copper from silicate-containing low-grade copper ores is proposed as a result of these studies.

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Kinetics of chalcopyrite dissolution by hydrogen peroxide in sulphuric acid

Cited by 145 publications

References 11 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

Copper Leaching Behavior of Iron-Oxide Hosted Copper-Gold Ore in Sulfuric Acid Medium

Copper Recovery from Silicate-Containing Low-Grade Copper Ore Using Flotation Followed by High-Pressure Oxidative Leaching

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