Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Li, Yubiao; Wei, Zhenlun; Qian, Gujie; Li, Jun; Gerson, Andrea R.

doi:10.3390/min6030083

Cited by 26 publications

(17 citation statements)

References 77 publications

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“…Watling (2013b) summarized current knowledge in respect of the hydrometallurgical systems of acidic sulfate, sulfate-chloride and sulfate-nitrate, and proposed that atmospheric pressure processes required catalysts, fine grinding or temperature. Li et al (2016) studied the kinetics and mechanisms of chalcopyrite dissolution at controlled redox potential of 750 mV in sulfuric acid solution and found that the addition of aqueous iron played an important role in accelerating Cu leaching rates, especially at lower temperature.…”

Section: Introductionmentioning

confidence: 99%

Roles of oxidants and reductants in bioleaching system of chalcopyrite at normal atmospheric pressure and 45 °C

Zhao

Wang

Tao

et al. 2017

International Journal of Mineral Processing

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Section: Introductionmentioning

confidence: 99%

Roles of oxidants and reductants in bioleaching system of chalcopyrite at normal atmospheric pressure and 45 °C

Zhao

Wang

Tao

et al. 2017

International Journal of Mineral Processing

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“…These concentrations have been calculated using ICP-OES results, Eh of leachates (both given in Table S2, Supplementary Materials), and the Nernst equation (Equation (3); [25,26]) and are shown in Figure 5. The reaction rate between pyrite and ferric iron was observed by Moses et al [27] to be one to two orders of magnitude greater than between pyrite and dissolved O2 in the pH range of 2-9.…”

Section: Leachate Chemistrymentioning

confidence: 99%

Strategies for Reduced Acid and Metalliferous Drainage by Pyrite Surface Passivation

Qian

Schumann²,

et al. 2017

Minerals

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Acid and metalliferous drainage (AMD) is broadly accepted to be a major global environmental problem facing the mining industry, requiring expensive management and mitigation. A series of laboratory-scale kinetic leach column (KLC) experiments, using both synthetic and natural mine wastes, were carried out to test the efficacy of our pyrite passivation strategy (developed from previous research) for robust and sustainable AMD management. For the synthetic waste KLC tests, initial treatment with lime-saturated water was found to be of paramount importance for maintaining long-term circum-neutral pH, favourable for the formation and preservation of the pyrite surface passivating layer and reduced acid generation rate. Following the initial lime-saturated water treatment, minimal additional alkalinity (calcite-saturated water) was required to maintain circum-neutral pH for the maintenance of pyrite surface passivation. KLC tests examining natural potentially acid forming (PAF) waste, with much greater peak acidity than that of the synthetic waste, blended with lime (≈2 wt %) with and without natural non-acid-forming (NAF) waste covers, were carried out. The addition of lime and use of NAF covers maintained circum-neutral leachate pH up to 24 weeks. During this time, the net acidity generated was found to be significantly reduced by the overlying NAF cover. If the reduced rate of acidity production from the natural PAF waste is sustained, the addition of smaller (more economically-feasible) amounts of lime, together with application of NAF wastes as covers, could be trialled as a potential cost-effective AMD mitigation strategy.

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“…Sulfidni minerali imaju stabilnu kristalnu rešetku, pa prilikom njihovog luženja rastvor mora sadržati oksidaciono sredstvo za oksidaciju sulfidnog sumpora. Feri, kupri, nitratni i nitritni joni, kiseonik, bakterije i drugi oksidansi koriste se kao sredstva za luženje sulfidnih minerala u sulfatnim i hloridnim rastvorima pri standardnom i povišenom pritisku [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

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Effects of structural and textural grain characteristics on leaching of sulphide minerals from a polymetallic concentrate by sodium nitrate and sulphuric acid solution

Sokić

Stojanovic

Marković

et al. 2017

Hem Ind

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In this paper, the influence of structural and textural characteristics of sulfide minerals on their leaching from a polymetallic concentrate by sulfuric acid and sodium nitrate solution is presented. The starting material was Pb?Zn?Cu sulphide polymetallic concentrate enriched during the flotation of a polymetallic ore in the "Rudnik" flotation plant (Rudnik ? Serbia). Leaching experiments were carried out in a closed glass reactor, which provides stable hermetic conditions and allows heating at constant temperature. Chemical, XRD, qualitative and quantitative microscopic and SEM/EDX analyses were used to characterizes samples of the polymetallic concentrate and leach residue. It was determined that chalcopyrite, sphalerite, galena, pyrrhotite and quartz were present in the polymetallic concentrate. The content of sulphide minerals was 69.5%, of which 60.9% occurred as liberated grains: 88.3% of chalcopyrite, 59.3% of sphalerite, 25.1% of galena and 51.6% of pirrhotite. The rest of chalcopyrite, sphalerite, galena and pirrhotite grains were in the forms of inclusions, impregnations, and simple and complex intergrowths. During the leaching process by sodium nitrate and sulphuric acid solution, it was shown previously that the leaching rate of sulphide minerals decreased with time while a part of the sulphide minerals remained in the leach residue. After leaching at 80?C for 120 min, the yields were 69.8, 82.7 and 67.1% for Cu, Zn and Fe, respectively. Lead, in the form of insoluble anglesite, remained in the leach residue. In addition to the anglesite, unleached sulfide minerals and quartz, elemental sulfur was found in the solid residue. The content of sulphide minerals was 35% of which 33.7% minerals occur independently. In specific, 54.7% of chalcopyrite, 31.9% of sphalerite, 8.2% of galena and 37.6% of pyrrhotite appear as separate grains with highly corroded surfaces. Therefore, the structural assembly of sulphide grains in the polymetallic concentrate is favourable and it is not the reason for the observed decrease in the leaching rate in the final process stages. The obtained findings may be explained by the presence of elemental sulphur that is formed during the reaction and precipitated at the grain surfaces, thus creating a diffusion barrier for the leach solution. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. TR34023]

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Kinetics and Mechanisms of Chalcopyrite Dissolution at Controlled Redox Potential of 750 mV in Sulfuric Acid Solution

Cited by 26 publications

References 77 publications

Roles of oxidants and reductants in bioleaching system of chalcopyrite at normal atmospheric pressure and 45 °C

Roles of oxidants and reductants in bioleaching system of chalcopyrite at normal atmospheric pressure and 45 °C

Strategies for Reduced Acid and Metalliferous Drainage by Pyrite Surface Passivation

Effects of structural and textural grain characteristics on leaching of sulphide minerals from a polymetallic concentrate by sodium nitrate and sulphuric acid solution

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