The galvanic interaction between gold and pyrite in the presence of ferric ions

Huai, Yangyang; Plackowski, Chris; Peng, Yongjun

doi:10.1016/j.mineng.2018.01.040

Cited by 13 publications

(5 citation statements)

References 27 publications

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“…It should be noting that the disappearance of those intermediates was in the order of Cu 1.8 S → Cu 7.2 S 4 → Cu 8 S 5 → Cu 5 FeS 4 → CuS, according to Figures 3 and 4. In addition, it has been reported by many researchers that there exists a galvanic effect between different semiconductor minerals when they are leached [49][50][51]. In the first stage of chalcocite leaching, several copper sulfide minerals appeared; the other potentials of these minerals were different and there existed a galvanic effect between them.…”

Section: Disscussion Of the Fine Phase Transformation Of Chalcocite Amentioning

confidence: 98%

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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Section: Disscussion Of the Fine Phase Transformation Of Chalcocite Amentioning

confidence: 98%

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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“…Pyrite (FeS 2 ) is also known as the fool’s gold due to its similarity with gold in appearance, which earned its gangue nature 1 , 2 , is presumed to be the most common sulfide mineral. Hence, it is of little surprise that it is often found when mining for other valuable minerals, such as gold 3 . This gangue nature of pyrite has led to the development of several processes in separating pyrite from other minerals.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical removal of pyrite scale using green formulations

Ahmed

Hussein

Onawole

et al. 2021

Sci Rep

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Pyrite scale formation is a critical problem in the hydrocarbon production industry; it affects the flow of hydrocarbon within the reservoir and the surface facilities. Treatments with inorganic acids, such as HCl, results in generation toxic hydrogen sulfide, high corrosion rates, and low dissolving power. In this work, the dissolution of pyrite scale is enhanced by the introduction of electrical current to aid the chemical dissolution. The electrolytes used in this study are chemical formulations mainly composed of diethylenetriamine-pentaacetic acid–potassium (DTPAK5) with potassium carbonate; diethylenetriamine pentaacetic acid sodium-based (DTPANa5), and l-glutamic acid-N, N-diacetic acid (GLDA). DTPA and GLDA have shown some ability to dissolve iron sulfide without generating hydrogen sulfide. The effect of these chemical formulations, disc rotational rate and current density on the electro-assisted dissolution of pyrite are investigated using Galvanostatic experiments at room temperature. The total iron dissolved of pyrite using the electrochemical process is more than 400 times higher than the chemical dissolution using the same chelating agent-based formulation and under the same conditions. The dissolution rate increased by 12-folds with the increase of current density from 5 to 50 mA/cm2. Acid and neutral formulations had better dissolution capacities than basic ones. In addition, doubling the rotational rate did not yield a significant increase in electro-assisted pyrite scale dissolution. XPS analysis confirmed the electrochemical dissolution is mainly due to oxidation of Fe2+ on pyrite surface lattice to Fe3+. The results obtained in this study suggest that electro-assisted dissolution is a promising technique for scale removal.

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“…Pyrite is the most widely distributed sulfide mineral in nature and is often associated with gold [9], copper [10] and zinc minerals [11]. In the bioleaching process, pyrite plays an important role in the leaching of other minerals, including the formation of galvanic cells with other minerals [12,13], encapsulation of other minerals [14,15], etc. Therefore, bioleaching of pyrite has attracted widely attention [5,6,8,9,12,3].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Yang¹,

Lin²

2020

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Bacterial adsorption on mineral surface is one of the key steps in bioleaching process. The bacteria adsorb on the mineral surface via the extracellular polymeric substances (EPS) layer. In this paper, the behavior of glucuronic acid, one of the key substances in EPS layer, adsorbed on the pyrite surface is studied using DFT and electrochemical methods. A dsorption capacity of glucuronic acid is stronger than that of water. G lucuronic acid adsorbs on pyrite surfaces and it follows a mixed type of interactions (physisorption and chemisorption). Adsorption of glucuronic acid on pyrite surface followed Langmuir's adsorption isotherm with adsorption standard free energy of -27.67kJ mol -1 . The structural and electronic parameters were calculated and discussed.

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The galvanic interaction between gold and pyrite in the presence of ferric ions

Cited by 13 publications

References 27 publications

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

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

Electrochemical removal of pyrite scale using green formulations

Archives of Metallurgy and Materials

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