Study on the second stage of chalcocite leaching in column with redox potential control and its implications

Niu, Xiaopeng; Руан, Ренман; Tan, Qiaoyi; Jia, Yan; Sun, Hanwen

doi:10.1016/j.hydromet.2015.04.022

Cited by 26 publications

(25 citation statements)

References 47 publications

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“…Chalcocite is the most abundant copper sulfide mineral after chalcopyrite [5,12], and it is the copper sulfide the most easily treated by hydrometallurgical routes [13]. Several investigations have been carried out for the leaching of this mineral with the use of multiple additives and in different media such as; bioleaching [14][15][16][17][18], ferric sulfate solution [19], chloride media [20][21][22][23], pressure leaching for chalcocite [24] and synthetic chalcocite (white metal) [25].…”

Section: Introductionmentioning

confidence: 99%

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Leaching of Pure Chalcocite in a Chloride Media Using Sea Water and Waste Water

Toro

Briceño

Pérez

et al. 2019

Metals

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Chalcocite is the most important and abundant secondary copper ore in the world with a rapid dissolution of copper in an acid-chloride environment. In this investigation, the methodology of surface optimization will be applied to evaluate the effect of three independent variables (time, concentration of sulfuric acid and chloride concentration) in the leaching of pure chalcocite to extract the copper with the objective of obtaining a quadratic model that allows us to predict the extraction of copper. The kinetics of copper dissolution in regard to the function of temperature is also analyzed. An ANOVA indicates that the linear variables with the greatest influence are time and the chloride concentration. Also, the concentration of chloride-time exerts a significant synergic effect in the quadratic model. The ANOVA indicates that the quadratic model is representative and the R2 value of 0.92 is valid. The highest copper extraction (67.75%) was obtained at 48 h leaching under conditions of 2 mol/L H2SO4 and 100 g/L chloride. The XRD analysis shows the formation of a stable and non-polluting residue; such as elemental sulfur (S0). This residue was obtained in a leaching time of 4 h at room temperature under conditions of 0.5 mol/L H2SO4 and 50 g/L Cl−.

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Section: Introductionmentioning

confidence: 99%

“…When operating in sulphated or chloride media, the oxidative dissolution of the chalcocite occurs in two stages [13,19,20,23,25].…”

Section: Introductionmentioning

confidence: 99%

Leaching of Pure Chalcocite in a Chloride Media Using Sea Water and Waste Water

Toro

Briceño

Pérez

et al. 2019

Metals

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“…Several researchers [23,24,[30][31][32] have reported two phases in which copper dissolves from chalcocite in a sulfate or chloride media:…”

Section: Introductionmentioning

confidence: 99%

“…According to Niu et al [30], the leaching from chalcocite to covellite is fast (Equation (4)) because of its low activation energy (4-25 kJ/mol); then, the reaction is controlled by the effect diffusive of an oxidant on the mineral surface. Otherwise, the stage expressed in Equation (5), which corresponds to the transformation of covelline to dissolved copper, is slower and requires an activation energy close to 72 kJ/mol, suggesting electrochemical control [24,33].…”

Section: Introductionmentioning

confidence: 99%

Statistical Study for Leaching of Covellite in a Chloride Media

Pérez

Toro

Saldaña

et al. 2020

Metals

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Covellite is a secondary copper sulfide, and it is not abundant. There are few investigations on this mineral in spite of it being formed during the leaching of chalcocite or digenite; the other investigations on covellite are with the use of mineraloids, copper concentrates, and synthetic covellite. The present investigation applied the surface optimization methodology using a central composite face design to evaluate the effect of leaching time, chloride concentration, and sulfuric acid concentration on the level of copper extraction from covellite (84.3% of purity). Copper is dissolved from a sample of pure covellite without the application of temperature or pressure; the importance of its purity is that the behavior of the parameters is analyzed, isolating the impurities that affect leaching. The chloride came from NaCl, and it was effectuated in a size range from –150 to +106 μm. An ANOVA indicated that the leaching time and chloride concentration have the most significant influence, while the copper extraction was independent of sulfuric acid concentration. The experimental data were described by a highly representative quadratic model obtained by linear regression (R2 = 0.99).

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“…Many publications show that the dissolved process of chalcocite acidic ferric sulfate leaching can be divided into two stages, with the production of secondary covellite as an intermediate (Equations (1) and (2)) [13,[20][21][22][23][24][25][26], whilst ferric ions were regenerated by Equation (3). Cu 2 S + 2Fe 3+ → Cu 2+ + 2Fe 2+ + CuS (1) CuS + 2Fe 3+ → Cu 2+ + 2Fe 2+ + S 0 (2)…”

Section: Introductionmentioning

confidence: 99%

Synchrotron Radiation XRD Investigation of the Fine Phase Transformation during Synthetic Chalcocite Acidic Ferric Sulfate Leaching

Fang

Wang

et al. 2018

Minerals

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The fine phase transformation process of chalcocite (Cu2S) leaching in acidic ferric sulfate solution was studied by leaching experiments and synchrotron radiation X-ray diffraction (SRXRD) tests. The results showed that the dissolution process of chalcocite was divided into two stages. In the first stage, Cu2S was firstly transformed to Cu5FeS4 and Cu2−xS, then the galvanic effect between Cu5FeS4 and Cu2−xS accelerated the dissolution process of Cu1.8S → Cu1.6S → CuS, and finally Cu5FeS4 was also transformed to CuS. While in the second stage, CuS was transformed to elemental sulfur, which formed the passivation layer and inhibited the leaching of chalcocite. Specifically, Cu5FeS4 was detected during the chalcocite leaching process by SRXRD for the first time. This research is helpful for revealing the detailed leaching process of chalcocite.

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Study on the second stage of chalcocite leaching in column with redox potential control and its implications

Cited by 26 publications

References 47 publications

Leaching of Pure Chalcocite in a Chloride Media Using Sea Water and Waste Water

Leaching of Pure Chalcocite in a Chloride Media Using Sea Water and Waste Water

Statistical Study for Leaching of Covellite in a Chloride Media

Synchrotron Radiation XRD Investigation of the Fine Phase Transformation during Synthetic Chalcocite Acidic Ferric Sulfate Leaching

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