Enhancing chalcopyrite leaching by tetrachloroethylene-assisted removal of sulphur passivation and the mechanism of jarosite formation

Kartal, Muhammet; Xia, Fang; Ralph, D.E.; Rickard, William D.A.; Renard, François; Li, Wei

doi:10.1016/j.hydromet.2019.105192

Cited by 56 publications

(19 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Leaching mechanisms for chalcopyrite with different lixiviants, such as sulfates, chlorides, ammonia and nitrates, have been proposed. At present, the leaching mechanism researches mainly focus on the product layer formed on the surface of chalcopyrite and the effects of these surface species on the leaching process [11,13]. Common surface products of chalcopyrite leaching are sulfur, sulfide and iron oxides.…”

Section: Discussion Of Reaction Mechanismmentioning

confidence: 99%

“…However, when there are enough chloride ions in the solution, the leaching kinetics becomes less affected by the concentration of chloride ions. The chloride concentration is greater than 0.5M, and increasing the chloride ion has little effect on the leaching rate of chalcopyrite [11]. When strong oxidants, such as chlorate and hypochlorous acid, etc., are added to the chloride system, most of the sulfur in chalcopyrite can be directly oxidized to SO 4 2− (Equations ( 9) and ( 10)), and the oxidizing property of hypochlorous acid is higher than that of chlorate [7].…”

Section: Discussion Of Reaction Mechanismmentioning

confidence: 99%

“…Moreover, a passivation layer can be easily formed on the surface of the chalcopyrite mineral during the leaching process to prevent its further dissolution, especially in the sulfate system [10]. The components of these passivation layers include elemental sulfur, polysulfide, or iron compounds [11]. Therefore, one of the research hotspots is to study the formation and elimination of the surface passivation layer; for example, using high-temperature and high-pressure conditions [12], ultrafine grinding of minerals [13] microwave or ultrasonic-assisted leaching [14,15], adding silver ions for catalytic desulfurization, applying solvents to dissolve sulfur [2], etc.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rapid Atmospheric Leaching of Chalcopyrite Using a Novel Reagent of Trichloroisocyanuric Acid

et al. 2021

View full text Add to dashboard Cite

With the decrease in high-grade chalcopyrite resources, the copper extraction from low-grade chalcopyrite has attracted more and more attention. However, the kinetic rates of chalcopyrite leaching with traditional oxidants are usually very slow due to the formation of the passivation layer. In this study, a novel reagent of chlorinated oxidant, trichloroisocyanuric acid (TCCA), was used to leach chalcopyrite for the first time. The experimental results showed that when the initial oxidant concentration for TCCA was 0.054 mol·L−1, the leaching temperature was kept at 55 °C, and the pH of the pulp was controlled at 1, the oxidation efficiency of Cu can reach above 90% in less than 30 min. Various analyses of chalcopyrite mineral ore and its oxidized residues, such as chemical composition analysis, X-ray diffraction analysis, scanning electron microscopy analysis and X-ray photoelectron spectroscopy, were conducted, respectively. No obvious passivation layer was found on the chalcopyrite surface, though the sulfur product can also be generated during the leaching. Reaction kinetic analysis results showed that the different influence of surface reaction and diffusion process on the dissolution of chalcopyrite is little due to the fast leaching speed. After calculation, the activation energy of the whole leaching reaction is 9.06 kJ·mol−1, much lower than that in other reports. The mechanism was also proposed that TCCA was hydrolyzed in the solution to form hypochlorous acid, which is the strong oxidant, and cyanuric acid, which prevents the formation of a passivation layer. The processing in this study is expected to be applied as a novel method for atmospheric leaching of chalcopyrite.

show abstract

Section: Discussion Of Reaction Mechanismmentioning

confidence: 99%

Section: Discussion Of Reaction Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rapid Atmospheric Leaching of Chalcopyrite Using a Novel Reagent of Trichloroisocyanuric Acid

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Nevertheless, the addition of these two organic agents does not completely inhibit passivation and, although there are improvements in the leaching process, the effect is limited. Kartal et al [19] investigated the improvement of chalcopyrite leaching by the addition of 20% vol of tetrachloroethylene (C 2 Cl 4 ). These authors found that tetrachlorethylene-assisted leaching led to 80% of copper extraction before passivation.…”

Section: Introductionmentioning

confidence: 99%

Hydrometallurgical Recovery of Cu and Zn from a Complex Sulfide Mineral by Fe3+/H2SO4 Leaching in the Presence of Carbon-Based Materials

Álvarez

Fidalgo

Gascó

et al. 2021

Metals

View full text Add to dashboard Cite

Chalcopyrite, the main ore of copper, is refractory in sulfuric media with slow dissolution. The most commonly employed hydrometallurgical process for the oxidation of chalcopyrite and copper extraction is the sulfuric acid ferric sulfate system The main objective of the present work is to study the use of cheap carbon-based materials in the leaching of copper and zinc from a sulfide complex mineral from Iberian Pyrite Belt (IPB). The addition effect of commercial charcoal (VC) and two magnetic biochars (BM and HM) that were obtained by pyrolysis of biomass wastes was compared to that of commercial activated carbon (AC). The experimental results performed in this work have shown that the presence of carbon-based materials significantly influences the kinetics of chalcopyrite leaching in the sulfuric acid ferric sulfate media at 90 °C. The amount of copper and zinc extracted from IPB without the addition of carbon-based material was 63 and 72%, respectively. The highest amount of extracted zinc (>90%) was obtained with the addition of VC and AC in IPB/carbon-based material ratio of 1/0.25 w/w. Moreover, it is possible to recover more than 80% of copper with the addition of VC in a ratio 1/0.25 w/w. Moreover, an optimization of the properties of the carbon-based material for its potential application as catalyst in the leaching of metals from sulfide is necessary.

show abstract

“…The influences of solution concentration, temperature, particle size, and stirring speed, as well as the kinetics of reaction were determined for the chalcopyrite leaching in sulfuric acid by sodium nitrate. Elemental sulfur was formed during the leaching process as an inhibitor of the leaching rate [26][27][28]. The influences of ferrous ions on oxidation of chalcopyrite with ferric ion in solutions of sulfuric acid were studied.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effects of ferric sulfate addition and mechanical activation on leaching of Sarcheshmeh copper sulfide concentrate

Asl

Razavizadeh

2021

jcc

View full text Add to dashboard Cite

In this paper, the leaching of a sulfide concentrate, from "Sarcheshmeh Copper Complex", by sulfuric acid is studied. The influences of sulfuric acid concentration and leaching temperature were scrutinized to optimize the processing parameters and to disclose the kinetics of the extraction process. The leaching rate of copper was not significantly improved with enhancing the temperature and concentration of sulfuric acid. The formation of elemental sulfur was found as a reducer of the leaching rate. Only ~70% of copper was extracted by adding 1M ferric sulfate as the oxidant agent, as well as increasing the leaching temperature up to 85 °C. By leaching the mechanically activated concentrate in Fe 2 (SO 4 ) 3 -doped H 2 SO 4 at 85 °C, the amount of extracted copper was ~90% after 180 min. The experimental results were excellently fitted with the diffusion-controlled kinetic model as the activation energy of ~27 kJ/mol was estimated.

show abstract

Enhancing chalcopyrite leaching by tetrachloroethylene-assisted removal of sulphur passivation and the mechanism of jarosite formation

Cited by 56 publications

References 78 publications

Rapid Atmospheric Leaching of Chalcopyrite Using a Novel Reagent of Trichloroisocyanuric Acid

Rapid Atmospheric Leaching of Chalcopyrite Using a Novel Reagent of Trichloroisocyanuric Acid

Hydrometallurgical Recovery of Cu and Zn from a Complex Sulfide Mineral by Fe3+/H2SO4 Leaching in the Presence of Carbon-Based Materials

Synergistic effects of ferric sulfate addition and mechanical activation on leaching of Sarcheshmeh copper sulfide concentrate

Contact Info

Product

Resources

About