Hydrometallurgical Processing of Gold-Bearing Copper Enargite Concentrates

Anderson, Corby; Twidwell, L.G.

doi:10.1179/cmq.2008.47.3.337

Cited by 27 publications

(18 citation statements)

References 3 publications

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“…In addition, at the initial moment, NO + ions could be formed, which, according to Anderson et al [44], acts as the strongest oxidizer in such systems.…”

Section: Chemistry Of Hno3 Leachingmentioning

confidence: 99%

Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid

Rogozhnikov

Shoppert

Dizer

et al. 2019

Metals

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The processing of refractory gold-containing concentrates by hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of arsenic in the ores. This paper describes the investigation of the kinetics of HNO3 leaching of sulfide gold-containing concentrates of the Yenisei ridge (Yakutia, Russia). The effect of temperature (70–85 °C), the initial concentration of HNO3 (10–40%) and the content of sulfur in the concentrate (8.22–22.44%) on the iron recovery into the solution was studied. It has been shown that increasing the content of S in the concentrate from 8.22 to 22.44% leads to an average of 45% increase in the iron recovery across the entire range temperatures and concentrations of HNO3 per one hour of leaching. The leaching kinetics of the studied types of concentrates correlates well with the new shrinking core model, which indicates that the reaction is regulated by interfacial diffusion and diffusion through the product layer. Elemental S is found on the surface of the solid leach residue, as confirmed by XRD and SEM/EDS analysis. The apparent activation energy is 60.276 kJ/mol. The semi-empirical expression describing the reaction rate under the studied conditions can be written as follows: 1/3ln(1 − X) + [(1 − X)−1/3 − 1] = 87.811(HNO3)0.837(S)2.948e−60276/RT·t.

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“…In addition, at the initial moment, NO + ions could be formed, which, according to Anderson et al [44], acts as the strongest oxidizer in such systems.…”

Section: Chemistry Of Hno3 Leachingmentioning

confidence: 99%

Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid

Rogozhnikov

Shoppert

Dizer

et al. 2019

Metals

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“…This is conditioned by the fact that in this case the rock-forming sulphide minerals and the reagent contain sulphur as the main element. Moreover, as it was indicated in our previous publications [1], [6], sulphur in combination with hydrothermal waters are the "causers" of gold ore deposit formation. Sulphur with water, forming in the natural environment various oxygen-free, and with the access of air, oxygen chemical compounds (hydrosulphides, sulphides, thiosulphates, etc.)…”

Section: Methodsmentioning

confidence: 78%

“…It is known that the technology of hydrometallurgical processing of gold-bearing sulphide raw materials includes two main process stages [1]- [4]. At the first process stage, the raw materials are oxidized with the conversion of sulphur, iron and arsenic into elements with a higher degree of oxidation.…”

Section: Introductionmentioning

confidence: 99%

Leaching process intensification of gold-bearing raw materials

Begalinov¹,

Shautenov²,

Almenov³

et al. 2022

Min. miner. depos.

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Purpose. Research on the process intensification of gold-bearing product hydrometallurgical processing based on mechanochemical milling of the initial sulphide material. Methods. Mechanochemical activating (oxidation) of sulphide gold-bearing concentrate under conditions of superfine milling, sulphite-thiosulphate leaching of the milled product after liquid phase separation. The float concentrate sample with a particle size of -0.074 mm, the Au content is 15.5 g/t is tested. When loading into the mill of an initial concentrate sample weighing 300 g, 600 ml of a calcium hydroxide solution with a concentration of 143 g/l are added. The weight of balls loaded into the mill in relation to the concentrate weight is 10:1. The remainder of the solid product after milling is subjected to lea-ching with a sulphite-thiosulphate reagent. Findings. A sharp increase in the milled product of 10 µm fractions (from 14.05 to 34.63%) has been determined, and the mass fraction of gold in the final milling product decreases from 15.5 to 13.0 g/t. This corresponds to the recovery of gold into solution at this stage at the level of 16%. It has been found that with an additional supply of 1 g/l of copper sulphate for copper in the process of milling, it is possible to reduce the gold content in the milled product to 8.3 g/t. Thus, the recovery of gold into solution at the stage of milling increases from 16 to 48%. During the milling process, partial leaching of gold by reagents formed from its own sulphur has been revealed. It has been found that the transition of gold into solution is caused by the formation of a water-soluble hydrosulphide complex of gold during milling (AuS). As a result of leaching with the reagent, an additional 27% of gold has been recovered. Originality. Phase transformations of the sulphide gold-bearing beneficiary product as a result of mechanochemical activation have been determined. For the first time this process has been implemented to intensify the leaching process of gold-bearing mineral raw materials. Practical implications. The research results can be used in technological processes for the processing of refractory gold-bearing ores and technogenic raw materials.

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“…The use of hydrometallurgical technologies for these materials is complicated by the formation of multicomponent solutions and the difficulty of separating copper from arsenic [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…The lowest soluble As compounds are arsenic sulfides [26], calcium arsenite, calcium arsenate [27,28] and iron arsenate [29][30][31][32][33]. Each of these precipitates exhibits relatively low solubility in the corresponding pH range, but these methods lead to loss of copper with arsenic-containing precipitates due to Cu co-precipitation, and do not yield high-quality respective copper products [20,29,34].…”

Section: Introductionmentioning

confidence: 99%

Leaching Kinetics of Arsenic Sulfide-Containing Materials by Copper Sulfate Solution

Karimov

Rogozhnikov

Shoppert

2019

Metals

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The overall decrease in the quality of mineral raw materials, combined with the use of arsenic-containing ores, results in large amounts of various intermediate products containing this highly toxic element. The use of hydrometallurgical technologies for these materials is complicated by the formation of multicomponent solutions and the difficulty of separating copper from arsenic. Previously, for the selective separation of As from copper–arsenic intermediates a leaching method in the presence of Cu(II) ions was proposed. This paper describes the investigation of the kinetics of arsenic sulfide-containing materials leaching by copper sulfate solution. The cakes after leaching of arsenic trisulfide with a solution of copper sulfate were described using methods such as X-ray diffraction spectrometry (XRD), X-ray fluorescence spectrometry (XRF), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy analysis (EDS). The effect of temperature (70–90 °C), the initial concentration of CuSO4 (0.23–0.28 M) and the time on the As recovery into the solution was studied. The process temperature has the greatest effect on the kinetics, while an increase in copper concentration from 0.23 to 0.28 M effects an increase in As transfer into solution from 93.2% to 97.8% for 120 min of leaching. However, the shrinking core model that best fits the kinetic data suggests that the process occurs by the intra-diffusion mode with the average activation energy of 44.9 kJ/mol. Using the time-to-a-given-fraction kinetics analysis, it was determined that the leaching mechanism does not change during the reaction. The semi-empirical expression describing the reaction rate under the studied conditions can be written as follows: 1/3ln(1 − X) + [(1 − X) − 1/3 − 1] = 4560000Cu3.61e−44900/RT t.

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Hydrometallurgical Processing of Gold-Bearing Copper Enargite Concentrates

Cited by 27 publications

References 3 publications

Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid

Leaching Kinetics of Sulfides from Refractory Gold Concentrates by Nitric Acid

Leaching process intensification of gold-bearing raw materials

Leaching Kinetics of Arsenic Sulfide-Containing Materials by Copper Sulfate Solution

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