Arsenopyrite Pyrite Leaching

Catalytic effect of pyrite on the leaching of arsenopyrite in ...

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 impact on the further leaching of arsenopyrite.

Leaching of the arsenopyrite/pyrite flotation concentrates ...

The data in Figure 2 show the variation of arsenopyrite/pyrite decomposition with pH at an iron to concentrate ratio of 0 and set leaching temperature of 105°C. The results exhibit an inverse near linear relationship between arsenopyrite/pyrite decomposition and pH.

Kinetics and mechanism of arsenopyrite leaching in nitric acid ...

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.

(PDF) Arsenopyrite and pyrite bioleaching: evidence from ...

DiscussionIn contrast to studies on pure minerals such as pyrite [12,13,15,18], arsenopyrite [14] or enargite [8,9,14,17], in this work, a technical flotation concentrate (mixture of pyrite and arsenopyrite) of Fairview mine was

The impacts of pyrite/pyrrhotite on aqueous arsenic species ...

2020/08/15 · 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). At an oxygen pressure of 28 bar and room temperature, the solution As existed as As(V) (0.5 M H 2 SO 4 coexisting with arsenopyrite (Aspy), arsenopyrite/pyrite or arsenopyrite/pyrrhotite).

OXIDATION OF PYRITE AND ARSENOPYRITE IN ...

arsenopyrite were subjected to bacterial leaching tests at 3% w/v pulp density and the degrees of oxidation were calculated and compared to with previous experimental studies. These results provided the basis to assess the behaviour of the above minerals in waste

Biological Leaching-Pressure Oxidation for Auriferous ...

A process has been evaluated, on a continuous pilot plant scale, to treat refractory gold arsenopyrite/pyrite concentrates. The process consisted of biological leaching to partially oxidise sulphides, followed by pressure leaching for

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

294 A.P.Chandra,A.R.Gerson/SurfaceScienceReports65(2010)293–315 4. Spatiallyresolvedsurfacecharacterisation.....308 ...

Pyrite−Arsenopyrite Galvanic Interaction and ...

Catalytic effect of pyrite on the leaching of arsenopyrite in sulfuric acid and acid culture medium. Electrochimica Acta 2018, 263, 8-16. DOI: 10.1016/j.electacta.2018.01.043. Can …

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.

Corrosion Behavior of a Pyrite and Arsenopyrite Galvanic Pair ...

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 ...

Effect of pyrite on bioleaching of arsenopyrite

2013/01/01 · 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 ...

An XPS and XANES Study on the Bioleaching of Arsenopyrite ...

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).

The ferric leaching kinetics of arsenopyrite

The variation in the ferric leaching rate of the arsenopyrite as a function of the solution redox potential displayed similar trends, irrespective of the conditions employed. The ferric leaching rate of the arsenopyrite decreased with decreasing redox potential of the leaching solution and could be abEyEX.

PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE ...

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

Potential Role of Thiobacillus caldus in Arsenopyrite Bioleaching

The third hypothetical mechanism by which T. caldus affects arsenopyrite leaching is the production of surface-active agents to solubilize the S 0. The yeast extract may act as a wetting agent to allow S 0 to be dispersed in the medium, thereby allowing further oxidation of the mineral.

Ural Federal University: Researchers Explored Alternative ...

2021/01/11 · Its increase from 50 to 80 ° C increases the efficiency of arsenic extraction from arsenopyrite from 68 to 83% after 1 hour of leaching with a solution of 10% nitric acid. The presence of pyrite and particle size reduction have the same beneficial effect.

Acid‐bacterial and ferric sulfate leaching of pyrite single ...

1982/01/01 · Pyrite leaching in ferric sulfate solutions was observed to be different when compared to acid‐bacterial leaching. Ferric sulfate leaching required nearly 2 × 10 3 ppm of Fe 3+ at 30°C while acid‐bacterial leaching at 30°C occurred without additions of Fe 3+ , …

arsenopyrite pyrite said

arsenopyrite (är'sĭnōpī`rīt, ärsĕn`ō–) or mispickel (mĭs`pĭkəl), silver-white to steel-gray mineral with the metallic luster characteristic of a pyrite pyrite or iron pyrites, pale brass-yellow mineral, the …

Biooxidation of a gold-bearing pyrite-arsenopyrite concentrate ...

1993/07/01 · The specific rates of bioxidation of pyrite and arsenopyrite were very similar for the bulk concentrate at about 0.15 day −1. However, it was significant that the biooxidation of arsenopyrite in the mixed mineral preceded that of pyrite

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