Leaching of chalcopyrite with ferric ion. Part I: General aspects

Córdoba, E.M.; Muñoz, J.A.; Blázquez, M.L.; González, F.; Ballester, A.

doi:10.1016/j.hydromet.2008.04.015

Cited by 319 publications

(186 citation statements)

References 27 publications

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“…Chalcopyrite (CuFeS2) is the most abundant copper containing mineral on the planet, accounting for approximately 70% of the total copper resources [1]. Although copper is predominantly extracted using pyrometallurgical processing, much attention has recently been paid to the development of an effective hydrometallurgical extraction methodology [2][3][4][5][6][7][8] due to the potential for improved economics and reduced environmental impact, especially for ore of low copper grade.…”

Section: Introductionmentioning

confidence: 99%

Chalcopyrite Dissolution at 650 mV and 750 mV in the Presence of Pyrite

Qian

et al. 2015

Metals

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Abstract:The dissolution of chalcopyrite in association with pyrite in mine waste results in the severe environmental issue of acid and metalliferous drainage (AMD). To better understand chalcopyrite dissolution, and the impact of chalcopyrite's galvanic interaction with pyrite, chalcopyrite dissolution has been examined at 75 °C, pH 1.0, in the presence of quartz (as an inert mineral) and pyrite. The presence of pyrite increased the chalcopyrite dissolution rate by more than five times at Eh of 650 mV (SHE) (Cu recovery 2.5 cf. 12% over 132 days) due to galvanic interaction between chalcopyrite and pyrite. Dissolution of Cu and Fe was stoichiometric and no pyrite dissolved. Although the chalcopyrite dissolution rate at 750 mV (SHE) was approximately four-fold greater (Cu recovery of 45% within 132 days) as compared to at 650 mV in the presence of pyrite, the galvanic interaction between chalcopyrite and pyrite was negligible. Approximately all of the sulfur from the leached chalcopyrite was converted to S 0 at 750 mV, regardless of the presence of pyrite.At this Eh approximately 60% of the sulfur associated with pyrite dissolution was oxidised to S 0 and the remaining 40% was released in soluble forms, e.g., SO42− . OPEN ACCESSMetals 2015, 5 1567

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Section: Introductionmentioning

confidence: 99%

Chalcopyrite Dissolution at 650 mV and 750 mV in the Presence of Pyrite

Qian

et al. 2015

Metals

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“…Even if the determination of the exact nitrogen requirements is difficult to estimate (Rawlings, 2005), it is known that the 0Km medium is a quite rich medium, especially concerning the nitrogen source (ammonium). Excess of ammonium and/or other nutrients, by allowing iron and silver precipitation could not only promote chalcopyrite hindering and slow down the copper recovery kinetics (Cordoba et al, 2008a;Klauber, 2008;Sandström et al, 2005) but also limit silver extraction from the bioleached residue (Frías et al, 2002). Reducing the potential impact of the nutrients on precipitation phenomena should be an alternative to improve process metal recovery.…”

Section: Discussionmentioning

confidence: 99%

“…However, there is still a debate concerning the nature of this film. Four candidates are most often proposed: metal deficient sulphides, elemental sulphur, polysulphides and jarosites (Cordoba et al, 2008a;Klauber, 2008;Rodriguez et al, 2003). From a process point of view, many authors agree on the fact that the dissolution rate of chalcopyrite is higher at redox potential of leach solution below a critical value (Hiroyoshi et al 1997(Hiroyoshi et al , 2000(Hiroyoshi et al , 2001.…”

Section: Discussionmentioning

confidence: 99%

“…It has been reported that silver content above 300 mg/kg (Cancho et al, 2007) or 800 mg/kg (Yajie et al, 2007) improves dissolution of this mineral. The reason for that improvement is that the product layer formed by a mixture of sulphur and Ag 2 S is porous and does not exert a barrier effect on the chalcopyrite dissolution (Cordoba et al, 2008a). However, the catalytic effect of silver is also strongly affected by the temperature (Cancho et al, 2007;Yajie et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

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Bioleaching of an organic-rich polymetallic concentrate using stirred-tank technology

et al. 2009

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The bioleaching of a concentrate produced from a black shale ore in an industrial operation in Poland was assessed. Following preliminary batch culture tests, processing in continuous conditions was tested to determine the main specifications for the application of the stirred-tank technology to this organic-rich polymetallic concentrate.The experimental work was carried out in a laboratory-scale unit consisting of 3 stirred tanks (50L or 20L) using an acidophilic and moderate thermophilic bacterial population (42°C). Different configurations of the unit and key operating parameters were tested (nutrient medium composition, solids concentration, agitation and aeration rates). The analysis of both bacterial community structure and mineralogical characteristics of the concentrate and the bioleach residues were implemented in order to better understand the chemical and biochemical reactions occurring in the system. Using the data produced during the continuous operation, downstream processing assessment for both copper and silver recovery was also carried out. 1The best copper recovery obtained in the continuous operation was 92% and a hot brine leaching of the bioleach residue (PLINT process) allowed to recover 92% of the silver.Copper and silver recoveries seemed to be limited by incomplete chalcopyrite dissolution. A preliminary techno-economic evaluation of the concentrate bioprocessing including bioleaching, copper and silver recoveries demonstrated the potential economic feasibility. Recovery of silver plays an important role in the economy of the process. This study presents promising values to further investigate the bioprocessing option.

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“…Chalcopyrite (CuFeS 2 ) is the most abundant and the most refractory copper sulfide mineral which accounts for about 70% of the copper reserves in the world 2 . At present, a large portion of the copper is produced from chalcopyrite ore via flotation followed by the pyrometallurgical method [3][4][5] . Due to the long-term mining activity and economic growth of countries in the world, the reduction of copper grade and depletion of high-grade copper ore have gradually been happened during last several decades 6,7 .…”

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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Leaching of chalcopyrite with ferric ion. Part I: General aspects

Cited by 319 publications

References 27 publications

Chalcopyrite Dissolution at 650 mV and 750 mV in the Presence of Pyrite

Chalcopyrite Dissolution at 650 mV and 750 mV in the Presence of Pyrite

Bioleaching of an organic-rich polymetallic concentrate using stirred-tank technology

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

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