arsenopyrite pyrite leaching

  • Catalytic effect of pyrite on the leaching of

    2018-2-10 · Pyrite is another common gold-bearing mineral and often intergrown with arsenopyrite [ 11 ]. The effect of pyrite on leaching of arsenopyrite cannot be ignored. According to the measured rest potentials of sulfide minerals [ 12 ], the rest potential of arsenopyrite is lower than that of pyrite.

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  • Leaching of the arsenopyrite/pyrite flotation concentrates

    2009-10-15 · LEACHING OF THE ARSENOPYRITE/PYRITE FLOTATION CONCENTRATES 1 MAHLANGU, T., GUDYANGA, F.P., and SIMBI, D.J. Leaching of the arsenopyrite/pyrite flotation concentrates using metallic iron in a hydrochloric acid medium. Hydrometallurgy Conference 2009,The Southern African Institute of Mining and Metallurgy, 2009.

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  • Arsenopyrite and pyrite bioleaching: evidence from

    2011-8-17 · After bioleaching, no signals of iron, arsenic and sulphur originating from pyrite and arsenopyrite were detected, confirming a strong oxidation and the dissolution of the particles. On the surfaces of the mineral residue particles, elemental sulphur as reaction intermediate of the leaching process and precipitated secondary phases (Fe–OOH and jarosite), together with

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  • Kinetics and mechanism of arsenopyrite leaching in

    2021-2-1 · The influence of pyrite on the leaching of arsenopyrite is probably associated with its catalytic action in the early stage of the process, which is due to the role of an alternative surface for the reduction of nitrate ions in electrochemical contact with arsenopyrite, while the process is in a kinetic or mixed mode.

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  • Leaching of pyrite-arsenopyrite concentrate in

    2014-9-25 · A community of thermoacidophilic chemolithotrophic microorganisms was shown to exhibit enhanced efficiency of leaching and biooxidation of the gold-bearing pyrite-arsenopyrite flotation concentrate in continuous mode of cultivation. Under the optimal values of growth parameters, the degree of oxidation of sulfide arsenic, iron, sulfur, and antimony in the line of

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  • Catalytic effect of pyrite on the leaching of arsenopyrite in

    2018-1-8 · While leaching in iron-free 9K medium, the buffer action keeping the pH stable promoted arsenopyrite dissolution as compared with acid leaching. And the addition of pyrite facilitated the arsenic extraction, but increasing the amount of pyrite added had no distinct

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  • Arsenic Pyrite Gold Extraction by Alkaline Leaching

    2017-7-22 · The U.S. Bureau of Mines investigated an alkaline oxidative leaching procedure for treating gold-bearing arsenopyrite (FeAsS) ore, as one of the continuing efforts to develop efficient and environmentally safe metallurgical

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  • The impacts of pyrite/pyrrhotite on aqueous arsenic

    2020-8-15 · In this study, the arsenic species in solution during the arsenopyrite pressure leaching with the co-existence of pyrite or pyrrhotite were investigated. In situ XAS has confirmed that the arsenic in solution was present mostly as As(V) at low temperatures and As(III) at elevated temperatures, and the As(III) can be re-oxidised to As(V) during cooling process.

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  • An XPS and XANES Study on the Bioleaching of

    In both chemical leaching and bioleaching, the addition of pyrite decreased the leaching rate of arsenopyrite. The arsenic speciation and minerology changes in the residues were analysed by X-ray Absorption Near Edge Structure (XANES) Spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and powder X-ray Diffraction (XRD).

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  • Galvanic interaction of grinding media with

    2018-1-15 · The amount of free cyanide, ferrocyanide and thiocyanate during leaching in the presence of (a) arsenopyrite and (b) pyrite as a function of leaching time. In the presence of pyrite, due to the lower galvanic current between pyrite and grinding media in comparison with arsenopyrite, the amount of iron hydroxide was lower and thus more free cyanide was

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  • Arsenopyrite and pyrite bioleaching: evidence from

    In this work, a multi-technical bulk and surface analytical approach was used to investigate the bioleaching of a pyrite and arsenopyrite flotation concentrate with a mixed microflora mainly consisting of Acidithiobacillus ferrooxidans. X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and X-ray-induced Auger electron spectroscopy mineral surfaces investigations, along

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  • Arsenopyrite and pyrite bioleaching: evidence from

    2019-12-12 · In this work, a multi-technical bulk and surface analytical approach was used to investigate the bioleaching of a pyrite and arsenopyrite flotation concentrate with a mixed microflora mainly consistin

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  • Effect of pyrite on bioleaching of arsenopyrite--《The

    When the mass ratio of pyrite to arsenopyrite is 10:2 and the particles size of pyrite is less than 74 μm, the highest leaching rate of arsenic is 97.7%, which is about 43.18 % higher than that of the arsenopyrite bioleaching without pyrite.

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  • Corrosion Behavior of a Pyrite and Arsenopyrite Galvanic

    2019-3-9 · pyrite and arsenopyrite in the leaching process has been seldom discussed. The novelty of this paper is the study of the corrosion behavior of pyrite, arsenopyrite, and the galvanic pair in the presence of. Minerals 2019, 9, 169 3 of 14

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  • Catalytic effect of pyrite on the leaching of arsenopyrite in

    2018-1-8 · While leaching in iron-free 9K medium, the buffer action keeping the pH stable promoted arsenopyrite dissolution as compared with acid leaching. And the addition of pyrite facilitated the arsenic extraction, but increasing the amount of pyrite added had no distinct

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  • [Investigation of stages of chemical leaching and

    We examined the chemical leaching and biooxidation stages in a two-stage biooxidation process of an auriferous sulfide concentrate containing pyrrhotite, arsenopyrite and pyrite. Chemical leaching of the concentrate (slurry density at 200 g/L) by ferric sulfate biosolvent (initial concentration at 3

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  • The ferric leaching kinetics of arsenopyrite

    2012-3-13 · reported. However, recent research has shown that the ferric leaching kinetics of pyrite wx wx6,7 and arsenopyrite 11 may be dependent on the ferric–ferrous iron ratio i.e., redox potential,and not a function of the total or ferric iron concentrations.. Boon 6 suggested that the ferric leaching of pyrite could be described by means ofwx

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  • An XPS and XANES Study on the Bioleaching of

    In the present study, we investigated the bioleaching of arsenopyrite with or without pyrite by moderate thermophiles. In both chemical leaching and bioleaching, the addition of pyrite decreased the leaching rate of arsenopyrite. The arsenic speciation and minerology changes in the residues were analysed by X-ray Absorption Near Edge Structure (XANES) Spectroscopy,

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  • [Optimization of bioleaching and oxidation of gold

    Biooxidation of refractory gold-bearing pyrite-arsenopyrite flotation concentrate was optimized and aburidance of predominant groups in the community ofthermophilic acidophilic chemolithotrophic microorganisms at various stages ofbioleaching was determined. The optimal parameters for growth and leaching/oxidation of the mineral components of

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  • Gold Pyrite, Pyrrhotite and Arsenopyrite Recovery

    2018-4-15 · Gold Pyrite, Pyrrhotite and Arsenopyrite Recovery. One of the more common classes of ores containing gold is when gold is associated with pyrite, pyrrhotite, and arsenopyrite. This is the area of gold recovery that has probably received the most research and plant optimization support especially in light of the long history of South African

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