arsenopyrite pyrite leaching

Catalytic effect of pyrite on the leaching of arsenopyrite ...
Feb 10, 2018 The pyrite-promoted arsenopyrite leaching in sulfuric acid was attributed to the galvanic interaction and the control of pH and redox potential, which led to the depressed formation of well-crystallized ferric arsenate (scorodite). But while leaching in iron-free 9K medium, the catalytic effect of pyrite on arsenopyrite oxidation was only ...
Catalytic effect of pyrite on the leaching of arsenopyrite ...
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.
Arsenopyrite and pyrite bioleaching: evidence from XPS ...
高达12%返现 Aug 17, 2011 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 and S) at the surface of the bioreactor feed particles and of the residue after bioleaching was investigated by X-ray ...
Leaching of the arsenopyrite/pyrite flotation concentrates ...
arsenopyrite component. The cyanide leach of the reductive leach residues showed very little improvement in gold recovery. The reductive leach process for arsenopyrite/pyrite has considerable limitations in terms of both desulphurization and precious metals liberation. Keywords: Pyrite, arsenopyrite reductive leaching, hydrogen sulphide ...
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
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
Arsenic Pyrite Gold Extraction by Alkaline Leaching
Jul 22, 2017 The arsenopyrite and pyrite are oxidized by an alkaline oxidative leach, and the precious metals are extracted by cyanidation of the leach residue. The alkaline leach solution is purified by precipitating arsenate and sulfate in successive steps and is recycled to the oxidative leach.
ALTA Gold 2012 E-Doc - Home Albion Process
leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either ... solution within sulphide minerals pyrite and arsenopyrite (FeAsS). The arsenic bearing pyrite is commonly known as arsenian pyrite and can contain gold in its structure. Rimming of pyrite with
Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores
arsenopyrite dissolution were determined using cyclic voltammetry and chronocoulometry. Initial arsenopyrite dissolution occurred at -0.20 V versus standard hydrogen electrode (SHE) in a sodium hydroxide (Na0H) solution. Leaching of a high-grade arsenopyritic ore containing, in percent, 28.2 As,
(PDF) Arsenopyrite and pyrite bioleaching: evidence from ...
Arsenopyrite and pyrite bioleaching: evidence from XPS, XRD and ICP techniques. Analytical and bioanalytical chemistry, 2011. Bernhard Elsener. Giovanni Loi. Giovanni Rossi. ... Laboratory-scale continuous bio-oxidation of a gold concentrate of high pyrite and enargite content.
Catalytic effect of pyrite on the leaching of arsenopyrite ...
In this study, the influence of pyrite on the leaching of arsenopyrite in sulfuric acid and iron-free 9K medium was investigated by leaching experiments and electrochemical analysis.
Leaching of the arsenopyrite/pyrite flotation concentrates ...
arsenopyrite component. The cyanide leach of the reductive leach residues showed very little improvement in gold recovery. The reductive leach process for arsenopyrite/pyrite has considerable limitations in terms of both desulphurization and precious metals liberation. Keywords: Pyrite, arsenopyrite reductive leaching, hydrogen sulphide ...
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).
An XPS and XANES Study on the Bioleaching of Arsenopyrite ...
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 ...
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
An XPS and XANES Study on the Bioleaching of Arsenopyrite ...
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, X-ray Photoelectron ...
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
Acid mine drainage formation and arsenic mobility under ...
Nov 15, 2020 For the XPS measurements, pyrite grains from the leaching residues of Case 1A after 29 days and Case 2B after 21 days were hand-picked to avoid any contamination of silicates and arsenopyrite. XPS analysis was conducted using a JEOL JPS-9200 spectrometer (JEOL Ltd., Japan) equipped with a monochromatized Al Kα X-ray source operating at 100 W ...
Arsenic stability in arsenopyrite-rich cemented paste ...
Arsenic (As) is a toxicant in tailings from sulphur deposits. It represents an environmental risk because of its high solubility. Tailings can be mixed with water (typically 25%) and a low proportion of hydraulic binder (3-7%) to produce a cemented paste backfill (CPB), stored in underground mine openings. CPB is a tailings storage technique, but it could also provide environmental advantages ...
[Thermoacidophilic micirobial community oxidizing the gold ...
An aboriginal community of thermophilic acidophilic chemolithotrophic microorganisms (ACM) was isolated from a sample of pyrite gold-bearing flotation concentrateat 45-47 degrees C and pH 1.8-2.0. Compared to an experimental thermoacidophilic microbial consortium formed in the course of cultivation
Development Status of Pre-arsenic Removal Technology in ...
Arsenic pyrite (arsenopyrite), realgar orpiment and arsenic are the major gold arsenic minerals. Arsenic pyrite is one of the most common gold-bearing minerals, often surrounded by finely divided particulate gold. In this case, the ore does not completely disintegrate the gold particles even by ultrafine grinding. ... so that the leaching rate ...
EP0119685A1 - Hydrometallurgical arsenopyrite process ...
A process for the hydrometallurgical recovery of gold from arsenical pyrite concentrate. The process comprises decomposing the concentrate by using a leach composed of higher valence nitrogen oxides present in acidic solution; subjecting the decomposed product to a solid-liquid separation to produce a residue and a liquid fraction; recovering gold from the residue by conventional means; and ...
Technology – Antilles Gold
Albion Leach uses near neutral pH leach conditions to oxidise gold bearing pyrite and arsenopyrite, plus any 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).
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.
Catalytic effect of pyrite on the leaching of arsenopyrite ...
In this study, the influence of pyrite on the leaching of arsenopyrite in sulfuric acid and iron-free 9K medium was investigated by leaching experiments and electrochemical analysis.
[Optimization of bioleaching and oxidation of gold-bearing ...
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 ...
arsenopyrite pyrite leaching - samariter-rubigen.ch
Chemical leaching of the concentrate (slurry density at 200 g/L) by ferric sulfate biosolvent (initial concentration at 3 We examined the chemical leaching and biooxidation stages in a two-stage biooxidation process of an auriferous sulfide concentrate containing pyrrhotite, arsenopyrite and pyrite.
Corrosion Behavior of a Pyrite and Arsenopyrite Galvanic ...
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 spectroscopy (EIS)) and frontier orbit calculations. The results show that (i) the linear sweep voltammetry curve and Tafel curve of the galvanic ...
Pressure Oxidation of a Refractory Sulfide Concentrate and ...
Aug 11, 2018 Oxidation of Pyrite and Arsenopyrite Oxidation of pyrite has been the subject of numerous studies which have been summarized in two comprehensive reviews (Hiskey and Schlitt, 1982, Lowson, 1982). Basic studies involving pressure oxidation of pyrite, particularly under the conditions applicable to autoclave leaching of gold-sulfide ores have ...
Enhanced Leaching of Arsenopyrite Concentrates as a ...
Apr 20, 2017 Enhanced Leaching of Arsenopyrite Concentrates as a Pretreatment for Gold Recovery from Refractory Ores Published on April 20, 2017 April 20, 2017 • 6 Likes • 0 Comments
Separating arsenopyrite from pyrite - Laboratory Testing ...
I require a high arsenopyrite concentrate with as little pyrite in it as possible for some leaching testwork but have not had any luck. Does anybody have any experience with this? I have tried using several reagents like hydrogen peroxide to float the pyrite out of the bulk concentrate, but the remaining concentrate has a low grade.
ALTA Gold 2012 E-Doc - Home Albion Process
leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either ... solution within sulphide minerals pyrite and arsenopyrite (FeAsS). The arsenic bearing pyrite is commonly known as arsenian pyrite and can contain gold in its structure. Rimming of pyrite with
Acid mine drainage formation and arsenic mobility under ...
Nov 15, 2020 For the XPS measurements, pyrite grains from the leaching residues of Case 1A after 29 days and Case 2B after 21 days were hand-picked to avoid any contamination of silicates and arsenopyrite. XPS analysis was conducted using a JEOL JPS-9200 spectrometer (JEOL Ltd., Japan) equipped with a monochromatized Al Kα X-ray source operating at 100 W ...
Pressure oxidation of pyrite-arsenopyrite refractory gold ...
The biooxidation of refractory pyrite-arsenopyrite gold-bearing concentrates was reinforced efficiently in the continuous pilot experiments. ... The oxygen pressure leaching of pyrite has been ...
Development Status of Pre-arsenic Removal Technology in ...
Arsenic pyrite (arsenopyrite), realgar orpiment and arsenic are the major gold arsenic minerals. Arsenic pyrite is one of the most common gold-bearing minerals, often surrounded by finely divided particulate gold. In this case, the ore does not completely disintegrate the gold particles even by ultrafine grinding. ... so that the leaching rate ...
[Investigation of stages of chemical leaching and ...
Chemical leaching of the concentrate (slurry density at 200 g/L) by ferric sulfate biosolvent (initial concentration at 3 We examined the chemical leaching and biooxidation stages in a two-stage biooxidation process of an auriferous sulfide concentrate containing pyrrhotite, arsenopyrite and pyrite.
Galvanic interaction of grinding media with arsenopyrite ...
converted into by-products. Cyanide gold leaching was the most eﬃcient when the 30% chromium media was used during the grinding of the ore for both pyrite and arsenopyrite. In addition, in the presence of pyrite, due to the lower galvanic current between pyrite and grinding media in comparison with arsenopyrite, the amount of