Thermodynamic Analysis of Possible Chalcopyrite Dissolution Mechanism in Sulfuric Acidic Aqueous Solution

Lu, Diankun; Wang, Wei; Chang, Yuqing; Xie, Feng; Jiang, Ke

doi:10.3390/met6120303

Cited by 14 publications

(8 citation statements)

References 28 publications

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“…Table II displays the speciation results for the tailings samples obtained using phreeqc simulation software and were accurately predicted within a 10% error threshold: As seen from Table II, a reduction in the formation of calcium salt species (CaSO 4 ) along with an increase in calcium ion (Ca 2+ ) occurs over the course of the leaching period (12 hours), evident from the pH evolution behavior (Fig. 2) as higher concentrations of Ca 2+ free hydrated ionic species compete with hydrogen ion to stabilize solution pH [46]. The speciation data for Cu species also agree with the observed recovery behavior (Fig.…”

Section: Speciation Resultsmentioning

confidence: 81%

“…Fe displays similar behavior to that of Cu indicating that during acid attack of hematite (the main constituent of Fe in the carbonatite tails solutions), Fe is more likely to form ferrous iron (Fe 2+ ). From previous studies it was observed that Fe is preferentially released in solution [46] before Cu as Fe 2+ ions compete with Cu 2+ ions; competition of Cu with Fe could reduce the concentration of soluble species in solution which contributes to the observed extraction behavior.…”

Section: Resultsmentioning

confidence: 97%

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The Kinetic Dissolution of Copper from Chalcopyrite-containing Carbonatite Tailings Samples in Sulphate Media

2019

SETWM-19, ACBES-19, EEHSS-19 Nov. 18-19, 2019 Johannesburg (South Africa)

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The aim of this study was to determine the rate at which Cu is extracted from the surface of chalcopyrite contained in the tailings from the carbonatitic ore obtained from the carbonate complex in Loolekop, Phalaborwa, South Africa; the rate formation of the passivation phenomena during mineral dissolution was also observed. The objectives of the study, in which the mineral was subjected to sulphate based leaching with ferric sulphate as oxidant were as follows: firstly, to observe the effects of room temperature conditions (25°C) on the extraction rate of Cu in the carbonatite tailings system and secondly to determine the effects of mineralogical composition of species within the host ore on the extraction rate and passivation rate formation. The tailings was subjected to X-ray florescence spectroscopy (XRF) for mineralogical characterization as well as X-ray diffraction spectroscopy (XRD) for bulk elemental composition. Phreeqc simulation software was used for the prediction of mineral species using acidity, alkalinity, chloride ion, pH, ORP and sulphate ion as input parameters. The tailings associated with calcite-magnesium, hematite and quartz was prone to acid attack at room temperature conditions during the initial phases of leaching. During the course of the set leaching time, accumulation of gypsum and jarosite occurred, disrupting the transfer of ions from the mineral surface as 5.55wt% Cu extraction was obtained after the leaching period (12 hour) as opposed to the peak extraction rate after 4 hours of leaching (16.58wt%).

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Section: Speciation Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 97%

The Kinetic Dissolution of Copper from Chalcopyrite-containing Carbonatite Tailings Samples in Sulphate Media

2019

SETWM-19, ACBES-19, EEHSS-19 Nov. 18-19, 2019 Johannesburg (South Africa)

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“…The most abundant type of copper mineral is chalcopyrite [1][2][3][4][5]. Chalcopyrite has traditionally been treated by conventional pyrometallurgical techniques [6], which consist of flotation, smelting and refining, and electrorefining [7].…”

Section: Introductionmentioning

confidence: 99%

Leaching Chalcopyrite with High MnO2 and Chloride Concentrations

Torres

Ayala

Jeldres

et al. 2020

Metals

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Most copper minerals are found as sulfides, with chalcopyrite being the most abundant. However; this ore is refractory to conventional hydrometallurgical methods, so it has been historically exploited through froth flotation, followed by smelting operations. This implies that the processing involves polluting activities, either by the formation of tailings dams and the emission of large amounts of SO2 into the atmosphere. Given the increasing environmental restrictions, it is necessary to consider new processing strategies, which are compatible with the environment, and, if feasible, combine the reuse of industrial waste. In the present research, the dissolution of pure chalcopyrite was studied considering the use of MnO2 and wastewater with a high chloride content. Fine particles (−20 µm) generated an increase in extraction of copper from the mineral. Besides, it was discovered that working at high temperatures (80 °C); the large concentrations of MnO2 become irrelevant. The biggest copper extractions of this work (71%) were achieved when operating at 80 °C; particle size of −47 + 38 µm, MnO2/CuFeS2 ratio of 5/1, and 1 mol/L of H2SO4.

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“…From previous studies it was found that CuSO 4 does not promote leaching in a sulphate system Error! Reference source not found.. Iron might also be released into the solution prior to copper which might also explain the low Cu 2+ concentration [30]. This will explain the reduction in the dissolution rate from hour one to twelve from 18.8% to 1.02% dissolution rate of copper in the ferric sulphate media as the dominant Cu species is CuSO 4 which gradually increases from hours one to twelve with an overall decrease in the Cu 2+ concentration as well as an increase observed in the concentration of free hydrated iron species Fe 2+ .…”

Section: Speciation Resultsmentioning

confidence: 99%

Prediction of Dissolution of Copper from a Chalcopyrite Carbonatite Ore of South Africa

Barlow¹,

Fosso‐Kankeu²,

Nyembwe³

et al. 2018

ASETH-18,ACABES-18 &Amp; EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa)

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Chalcopyrite accounts for 70% of all copper bearing minerals and therefore has been studied closely to understand the dissolution kinetics in hope of overcoming the passivation film and increasing the extraction rates of copper. In this study carbonatite samples were obtained from a mining company in South Africa. The carbonatite samples were leached and the leachates were assessed for the metal ions content, pH, electrical conductivity (EC), RedOx potential (RP), acidity, major anions (sulphate, chloride) as well as iron ion concentration for speciation prediction. Speciation of metal ions was conducted through the use of PHREEQC modelling software. The main objective of the study was to determine the kinetic dissolution pattern of the run of mine (ROM) chalcopyrite samples from the carbonatite host rock over time as a varying factor. The mineralogical investigation showed that the ROM sample was dominated by calcite magnesium (Ca0.97 Mg 0.03 (CO 3 )). The elemental investigation showed that the sample was dominated by Ca and Fe with mass% of 49.81 and 26.31 respectively. The dissolution curve for copper displayed and overall decrease in dissolution rate of copper clearly showing the effects of passivation on the chalcopyrite mineral; a peak dissolution rate (22.8%) was observed after 7 hours of leaching. From the ICP data the major cation in the leachate of the ROM was determined to be Ca, Cu, Fe and Mg. The PHREEQC results showed that Ca, Cu and Mg was dominant as sulphate salt species while Fe was dominant as a free ionic species (Fe 2+ ).

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Thermodynamic Analysis of Possible Chalcopyrite Dissolution Mechanism in Sulfuric Acidic Aqueous Solution

Cited by 14 publications

References 28 publications

The Kinetic Dissolution of Copper from Chalcopyrite-containing Carbonatite Tailings Samples in Sulphate Media

The Kinetic Dissolution of Copper from Chalcopyrite-containing Carbonatite Tailings Samples in Sulphate Media

Leaching Chalcopyrite with High MnO2 and Chloride Concentrations

Prediction of Dissolution of Copper from a Chalcopyrite Carbonatite Ore of South Africa

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