arsenopyrite pyrite leaching
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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 adsorbed

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Catalytic effect of pyrite on the leaching of

During acid leaching, the addition of pyrite resulted in the further oxidation of arsenopyrite, for the reason that the galvanic interaction made the pH increase and redox potential decrease, and then the formation of arsenate precipitates with high crystallinity was depressed.

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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 three laboratory reactors (D ...

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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.

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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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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

2012-10-4  leaching the host mineral must be broken by mechanical or chemical means. The aim of this study was to study the effect of temperature, oxygen partial pressure and slurry density on pressure oxidation of pyrite-arsenopyrite gold concentrate. Batch oxidation tests in

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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 available for gold extraction.

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Arsenopyrite and pyrite bioleaching: Evidence from

In this study, the influence of pyrite on the biooxidation of arsenopyrite in the presence of Sulfobacillus thermosulfidooxidans was investigated by leaching experiments and surface characterizations.

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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 three laboratory reactors (D ...

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arsenopyrite pyrite leaching - wizytowkifirm

Leaching of pyrite-arsenopyrite concentrate in Leaching of pyrite-arsenopyrite concentrate in bioreactors during continuous cultivation of a thermoacidophilic microbial community I. A. Tsaplina 1, A. E. Panyushkina 1, V. S. Melamud 1, N. V. Grigor''eva 1

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An XPS and XANES Study on the Bioleaching of

In this study, the impact of pyrite and pyrrhotite on the arsenic solution species in arsenopyrite pressure leaching were investigated by in-situ synchrotron X-Ray Absorption Spectroscopy (XAS).

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The ferric leaching kinetics of arsenopyrite - MINTEK

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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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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(PDF) Treatment of a gold bearing arsenopyrite

The kinetics of the chemical oxidation stage (ferric sulphate leaching) is enhanced by the use of silver as a catalyst and moderate high temperature. ... pyrite-arsenopyrite ore by ferric sulfate ...

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Separating arsenopyrite from pyrite - Laboratory

2021-6-25  The first step is to produce pyrite-arsenopyrite concentrate at pH 9 to 10. Sulphuric acid can be used to regulate the pH and copper sulphate to active the sulphides. It is necessary to consider a collector such as PAX, 20 to 30 g/t is a good range to evaluate.

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

2012-10-4  leaching the host mineral must be broken by mechanical or chemical means. The aim of this study was to study the effect of temperature, oxygen partial pressure and slurry density on pressure oxidation of pyrite-arsenopyrite gold concentrate. Batch oxidation tests in

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The mechanisms of pyrite oxidation and leaching: A ...

2017-11-23  A.P.Chandra,A.R.Gerson/SurfaceScienceReports65(2010)293–315 295 Table 1 Restpotentialofsomecommonsulfidemineralsdeterminedunderstandard conditions.

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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 three laboratory reactors (D ...

More

Arsenopyrite and pyrite bioleaching: Evidence from

In this study, the influence of pyrite on the biooxidation of arsenopyrite in the presence of Sulfobacillus thermosulfidooxidans was investigated by leaching experiments and surface characterizations.

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Arsenic Pyrite Gold Extraction by Alkaline Leaching

2017-7-22  Ore A contained approximately 61 pct arsenopyrite and 9 pct pyrite, and ore B contained 35 pct arsenopyrite and 24 pct pyrite. The low-grade ore contained only 1 pct arsenopyrite and 5 pct pyrite. Scanning electron microscopy analysis and X-ray diffraction patterns of the ores indicated that virtually all of the arsenic was present as arsenopyrite.

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The ferric leaching kinetics of arsenopyrite - MINTEK

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

More

(PDF) Treatment of a gold bearing arsenopyrite

The kinetics of the chemical oxidation stage (ferric sulphate leaching) is enhanced by the use of silver as a catalyst and moderate high temperature. ... pyrite-arsenopyrite ore by ferric sulfate ...

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Corrosion Behavior of a Pyrite and Arsenopyrite

In this paper, the galvanic effect of pyrite and arsenopyrite during the leaching pretreatment of gold ores was determined with the use of electrochemical testing (open circuit potential, linear sweep voltammetry, Tafel, and electrochemical impedance

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

2012-10-4  leaching the host mineral must be broken by mechanical or chemical means. The aim of this study was to study the effect of temperature, oxygen partial pressure and slurry density on pressure oxidation of pyrite-arsenopyrite gold concentrate. Batch oxidation tests in

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The Albion Process for Refractory Gold - Core Resources

2019-5-1  Pyrite Leaching – Acidic Conditions FeS 2 + 15/4O 2 + 1/2H 2 O = 1/2Fe 2 (SO4) 3 + 1/2H 2 SO 4 FeS 2 + 9/4O 2 + 1/2H 2 SO 4 = 1/2Fe 2 (SO4) 3 + 1/2H 2 O + S The first reaction is the main pyrite leach reaction, however the leach conditions can be adjusted to favour the second reaction and minimise oxygen consumption if required. Arsenopyrite ...

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The mechanisms of pyrite oxidation and leaching: A ...

2017-11-23  A.P.Chandra,A.R.Gerson/SurfaceScienceReports65(2010)293–315 295 Table 1 Restpotentialofsomecommonsulfidemineralsdeterminedunderstandard conditions.

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(PDF) Role of Ag+ in the Bioleaching of Arsenopyrite

2020-3-22  Arsenopyrite (FeAsS) is often associated with gold, but pre-treatment is necessary prior to gold leaching, mainly due to the gold encapsulation in the matrix of FeAsS.

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