Arsenopyrite Pyrite Leaching

Arsenopyrite Pyrite Leaching


Arsenopyrite - an overview | ScienceDirect Topics

In the presence of dissolved oxygen, the relative leaching rates of the sulfides in the ammoniacal thiosulfate system were found to be in the order of chalcopyrite > pyrrhotite > arsenopyrite > pyrite. Electron microscopy and Raman spectroscopy studies indicated the formation of iron oxide (hematite) at the chalcopyrite, pyrrhotite, and pyrite ...

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Studies on the bioleaching of refractory concentrates

The chemical ferric leaching rate of pyrite and arsenopyrite decrease with a decrease in the solution redox and may be described using a modified Butler-Volmer equation. The bacterial ferrous-iron oxidation kinetics of L. ferrooxidans also depend on the redox potential, and can be described using a Michaelis-Menten

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Arsenopyrite Weathering and Leaching of Arsenic in an

Finally, arsenic concentration was determined by ICP-MS. 2.4 Leaching Experiment of Pulverized Minerals A leaching experiment was carried out on the pure and mixed minerals to investigate the influence of the co-existence of pyrite (PY) and chalcopyrite (CP) with arsenopyrite (AP) on arsenopyrite weathering.

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Technology – Antilles Gold

Albion Leach uses near neutral pH leach conditions to oxidise gold bearing pyrite and arsenopyrite, plu tellurides and sellenides contained within the sulphide mineral concentrate. The neutral leach is carried out at a selective pH determined from testwork (typically between pH 4 and pH 6).

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Leaching of pyrite-arsenopyrite concentrate in bioreactors

Sep 25, 2014 · 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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PDF Leaching of the arsenopyrite/pyrite flotation concentrates

LEACHING OF THE ARSENOPYRITE/PYRITE FLOTATION CONCENTRATES 9 Drawing parallels with the pyrite/iron system and the pyrite/sphalerite system, it can be concluded that iron dissolution is supported by the hydrogen evolution reaction on the inert pyrite mineral particle surface.

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Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite

pyrite, with lesser amounts of arsenopyrite (estimated to be 10-20% of the sulfides), and trace to minor chalcopyrite, sphalerite, pyrrhotite, galena and covellite. Serni-quantitative

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Arsenopyrite and pyrite bioleaching: evidence from XPS, XRD

Arsenopyrite and pyrite bioleaching: ... Arsenopyrite and pyrite bioleaching: evidence from XPS, XRD and ICP techniques Abstract 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.

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Migration of arsenic(III) during bacterial oxidation of

During bacterial oxidation of the arsenopyrite that contaminated a chalcopyrite concentrate, the bioextraction of arsenic from the concentrate was examined. A long-term constant As(III) concentration, representing a large portion of the total arsenic, occurred in the leaching medium. As(III) was not further oxidized, either under bioextraction conditions or by Fe(III) in the presence of the ...

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Arsenopyrite - Wikipedia

Arsenopyrite is an iron arsenic sulfide (FeAsS). It is a hard (Mohs 5.5-6) metallic, opaque, steel grey to silver white mineral with a relatively high specific gravity of 6.1.[1] When dissolved in nitric acid, it releases elemental sulfur. When arsenopyrite is heated, it produces poisonous sulfur and arsenic fumes which can be fatal if inhaled ...

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