Arsenic Pyrite Gold Extraction by Alkaline Leaching Oxidation
2017/07/22 · Metallurgical ContentLeaching Chemistry and Process ConsiderationExperimental Procedures ElectrochemicalLeachingPrecious Metal ExtractionArsenic and Sulfur Separation ...
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.
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.
Arsenopyrite and Pyrite Bioleaching - Evidence from XPS
The flotation concentrate was a mixture of pyrite (FeS(2)) and arsenopyrite (FeAsS); after bioleaching, 95% of the initial content of pyrite and 85% of arsenopyrite were dissolved. The chemical state of the main elements (Fe, As
Gold and silver recovery by cyanidation of arsenopyrite ore
--The arsenopyrite matrix, the pyrite, iron arsenate and bismuth do not appear to be attacked by the leaching agent. LEACHING STUDY Materials and procedureThe ore samples used and their composition have been described above. Samples for studies of leaching in cyanide solution were prepared by crushing and grinding in a laboratory ball mill and ...
PDF ALTA Gold 2012 E-Doc - Home | Albion Process
Rimming of pyrite with arsenic-rich assemblages is often common as well as arsenopyrite-marcasite-pyrite associations. The gold-pyrite association is dependent on ore grade and textural features of the ore. When present with pyrite, arsenopyrite commonly will have significantly higher gold grades than the pyrite associations.
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. 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 ...
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).
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
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 ...
The ferric leaching kinetics of arsenopyrite - Mintek
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
Frontiers | Arsenopyrite Bio-Oxidization Behavior in
Arsenopyrite is the dominant arsenic-bearing sulfides in nature, which is usually covered on the gold (Ubaldini et al., 1997). The dissolution extent of arsenopyrite influences the gold recovery in the cyanidation process (Li et al., 2006). It is of great importance to understand the mechanism of arsenopyrite dissolution.
Stability, Structure, and Electronic Properties of the Pyrite
Pyrite is the most common sulfide in the Earth. In the presence of arsenopyrite its oxidation is delayed, and instead, the arsenopyrite increases its oxidation rate, releasing As(III) and As(V) species in the medium. DFT/plane waves calculations were performed on pyrite/arsenopyrite interface models to understand the stability, structure, and electronic properties of the interface. This is the ...
AME 161 Arsenopyrite, Gold & Pyrite | Below BC
Pyrite often forms perfect cubes, which can grow to quite large sizes, because of its crystal structure. The word pyrite comes from the Greek word ‘pyr’ meaning fire, because it will spark if hit with other metal or stone objects. Arsenopyrite is a sulphide similar to pyrite but contains arsenic as well as iron.
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
PDF) Arsenopyrite and pyrite bioleaching: evidence from
DiscussionIn contrast to studies on pure minerals such as pyrite [12,13,15,18], arsenopyrite  or enargite [8,9,14,17], in this work, a technical flotation concentrate (mixture of pyrite and arsenopyrite) of Fairview mine was
Flotation Behavior of Arsenopyrite and Pyrite, and Their
Pyrite had low floatability at both pH 4 and pH 10. Just as for arsenopyrite, the result for pH 10 was caused by the low E H of pulp. Yet, interestingly enough, different from the case of arsenopyrite, pyrite at pH 4 had low floatabilityE
PDF The mechanisms of pyrite oxidation and leaching: A
A.P.Chandra,A.R.Gerson/SurfaceScienceReports65(2010)293-315 295 Table 1 Restpotentialofsomecommonsulfidemineralsdeterminedunderstandard conditions.
The mechanisms of pyrite oxidation and leaching: A
294 A.P.Chandra,A.R.Gerson/SurfaceScienceReports65(2010)293–315 4. Spatiallyresolvedsurfacecharacterisation.....308 ...
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
PDF The ferric leaching kinetics of arsenopyrite
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
Arsenopyrite | Scientific.Net
Journal of Biomimetics, Biomaterials and Biomedical Engineering
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
Biooxidation of a gold-bearing pyrite-arsenopyrite
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, suggesting a sequential mechanism.
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 …
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).
PDF Establishing thE ProcEss MinEralogy of gold orEs
In gold ores, pyrite and arsenopyrite often occur in three morphological types: coarse, porous (blastic) and fine-grained. Framboidal and microcrystalline pyrite are also observed in some gold deposits. Generally, the order of concentration of gold in pyrite and arsenopyrite is: fine-grained>porous>coarse-grained (Figures 8 & 9). In some
PDF 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 complete sulphide oxidation and arsenic precipitation, followed by liquor neutralisation and
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).
PDF) Arsenic stability in arsenopyrite-rich cemented paste
The amount of As5+ increases in behaviour is different in the reference tailings sample, and is mainly OPC and OPC-FA samples, whereas it decreases for OPC-S sample. controlled by arsenopyrite or arsenical pyrite oxidation at neu- For the OPC based mixtures, the leaching tests suggest that cal- tral pH .