Photochemical oxidation and dissolution of arsenopyrite …
Arsenic-containing pyrite, realgar and arsenopyrite are main sulfide minerals, and arsenopyrite is the most common arsenic-containing sulfide minerals (Yu et al., 2007, Murciego et al., 2011). The As content in arsenopyrite can reach up to 45 wt.% (Paikaray, 2015). Therefore, the mechanisms of the oxidative dissolution of arsenopyrite …
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Phase relations of arsenian pyrite and arsenopyrite
Abstract. Arsenian pyrite containing above 1 wt% As plays a crucial role in deposition and deportment of Au and other chalcophile elements. The importance of …
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Mineralogy and geochemistry of gold-bearing arsenian pyrite …
Sulfides in the deposit are mainly arsenian pyrite, arsenopyrite, and marcasite with minor orpiment, realgar, and stibnite. Gangue minerals include quartz, dolomite, calcite, and clay minerals (e.g., kaolinite). Gold mineralization and paragenesis. ... have located regions containing large concentrations of gold nanoparticles (5–10 nm) ...
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Stability, Structure, and Electronic Properties of the …
ABSTRACT: 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 …
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Arsenopyrite
Pyrite can contain significant amounts of arsenic. Concentrations of up to 10 wt% (Fleet et al., 1993), 19 wt% (Reich et al., 2005), and 12 wt% (Paktunc et al., 2006) have been …
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Trace Element Characteristics of Pyrite and …
Gold mineralization is consistently associated with acicular arsenopyrite, and to a lesser degree with pyrite, disseminated in host rocks, sulphide veinlets, quartz …
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Arsenopyrite
The overall reactions of pyrite and arsenopyrite with oxygen can be summarized in Eqs. (1) and (2), respectively. Ferric hydroxide is the product in both cases. ... The use of arsenic-containing pesticides in the past has left large areas of agricultural land contaminated [100]. Arsenic enters the human body via inhalation and the ...
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Effect of Carbon Sources on Pyrite-Arsenopyrite …
The goal of the present work was to evaluate the effect of carbon sources on the bio-oxidation of the concentrate containing 56% pyrite and 14% arsenopyrite at different temperatures (40 and 50 ...
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Application of Silicate-Based Coating on Pyrite and Arsenopyrite …
An effective layer containing Si and Fe can be developed on the pyrite particles following treatment with solutions having variable Si concentrations (0.8–300 mM) ... The surface of coated pyrite and arsenopyrite particles was examined by scanning electron microscopy (SEM) using a Jeol6380LV microscope at 15–20 kV accelerating …
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A Brief Review of Auriferous Sulphide Flotation Concentration; Pyrite
Separation of pyrite and arsenopyrite in the absence and presence of MAA and preaeration (Tapley and Yan, 2003) ... (1998), " Floatabilities of gold-containing pyrite .
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Pyrite-promoted dissolution of arsenopyrite in the …
The weathering of arsenopyrite in mine wastes is crucial for the formation of arsenic-containing acid mine drainage (AMD). ... but increasing the mass ratio of pyrite to arsenopyrite above 1 had ...
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Minerals | Free Full-Text | Origin of Disseminated Gold …
In disseminated pyrite and arsenopyrite (up to 5–8%) in carbonaceous clastic rocks with pyrite–arsenopyrite–sericite–carbonate-quartz alterations, there is also "invisible" gold, which is in the form of a solid solution or nanoparticles [6,9,10,11,12]. Currently, the greatest economic value in the YKMB is Au-quartz veins and/or the ...
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Arsenopyrite
Arsenopyrite was observed to be more reactive than pyrite, chalcopyrite, galena, and sphalerite. Oxidation of arsenopyrite led to the formation of scorodite on the surface. The activation energies for arsenopyrite oxidation varied from 18 kJ mol –1 at 0–25 °C, to a slightly negative Ea of−6 kJ mol −1 at 25–60 °C.
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Textures and trace element signatures of pyrite and …
In addition to Au, pyrite and arsenopyrite can contain a range of trace elements, including Sb, Cu, Co, and Ni measurable by laser ablation-inductively coupled …
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Frontiers | Arsenopyrite Bio-Oxidization Behavior in …
In arsenopyrite bioleaching, the interfacial reaction between mineral and cells is one of the most important factors. The energy of the interface is influenced by the mineralogical and microbiological characteristics. In this paper, the interfacial energy was calculated, and the surface of arsenopyrite during the bioleaching process was …
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Gold Ore
Pyrite–arsenopyrite concentrates containing up to 34% pyrite sulfur and 24% arsenic can be successfully treated. A number of commercial bioreactor operations have been developed around the world, the major among them designed and erected by BIOX-Outotec. Others include BacTech and BIONORD as illustrated in Table 8.1.
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Arsenopyrite Mineral | Uses and Properties
Uses of Arsenopyrite and Arsenic. Arsenopyrite is the primary ore of arsenic metal. The mineral contains approximately 46% arsenic by weight. Arsenic metal is used to produce a variety of alloys. It was historically used to harden lead in ammunition, but this use was nearly eliminated by the late 1900s.
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Arsenic Pyrite Gold Extraction by Alkaline …
Ores containing high carbonates will result in high acid consumption. Finally, silver recovery from the procedure is usually poor because during oxidation silver has the propensity to combine with …
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Review on arsenic removal from sulfide minerals: An …
Catalytic effect of pyrite on the leaching of arsenopyrite in sulfuric acid and acid culture medium. Electrochim. Acta (2018) ... Results showed that all of iron oxides/hydroxides phases, all of rhodochrosite particles, and parts of pyrite were arsenic-containing, with the average contents of As measured to be 0.142, 0.052, and 0.047 % ...
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Minerals | Free Full-Text | Flotation Depression of Arsenopyrite …
Arsenopyrite is a common arsenic-containing mineral that is often closely associated with sulfide minerals, such as pyrite, chalcopyrite, pyrrhotite, galena, and sphalerite, and with precious metals, such as gold and silver. The selective inhibition of arsenopyrite is an important method used to reduce the arsenic content of processed …
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Solved Question 4 (40 marks) A. A plant treats an ore
A plant treats an ore containing Pyrite (FeS2), Arsenopyrite (FeAss) and chalcopyrite (CuFeS2). After ore upgrading and analysis, the Arsenic (As), Copper (Cu) and Iron (Fe) concentration in the concentrate were 9.6%, 13.5% and 63.3% respectively. What is the concentration of pyrite, arsenopyrite, chalcopyrite in the concentrate?
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Investigating the selective flotation of auriferous arsenian pyrite …
Thionocarbamate, specifically modified Isopropyl Ethyl Thionocarbamate (IPETC) is selective in the separation of pyrite from arsenopyrite, following copper activation. In this work, the flotation response of a refractory gold (Au) ore containing arsenic (As) mainly in the form of arsenian pyrite is investigated to reject gold-barren …
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Stability, Structure, and Electronic Properties of the Pyrite
Pyrite and arsenopyrite calculated band gaps as a function of the Hubbard (U−J) parameter. Black and red dashed lines represent the experimental band gap for pyrite 38 (0.90 eV) and arsenopyrite ...
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Oxidation mechanism of arsenopyrite under alkaline …
The research results have important theoretical significance for the backfilling process of tailings containing arsenopyrite. ... ROS formation and the redox conversion of As during the interaction between pyrite and arsenopyrite as function of O 2, pH and pyrite surface oxidation were investigated. Pyrite promoted arsenopyrite oxidation and As ...
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Bio-oxidation of Arsenopyritic and Pyritic Containing Gold …
The sample Ore was sieved to -0.075 mm before used for all leaching experiments. X-ray diffraction analysis of the sample showed pyrite (FeS 2) as the major phase and Chemical analyses also indicated that the sample contained arsenical pyrite or arsenopyrite (FeAsS). The particle size of the sample was 80% below 75 μm (Figure 1).
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Textures and trace element signatures of pyrite and arsenopyrite …
The Gutaishan deposit is a slate-hosted lode Au–Sb deposit in the Xiangzhong Sb–Au metallogenic province, South China. The deposit has a proven reserve of ca. 9 -t gold at an average grade of 13-g/t and contains 2500-t Sb. The deposit represents the product of a complex ore-forming process, comprising four different stages, of which …
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The nature and partitioning of invisible gold in the pyrite …
As a result of these limitations, the mechanisms of Au incorporation in hydrothermal pyrite and arsenopyrite and the role of arsenic and other elements played in this process still remain hypothetical. For example, some earlier studies invoked gold transport by the fluid phase in the form of Au-As-S (Sb, Se, Te) aqueous complexes and …
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An underexploited invisible gold resource in the Archean
LA ICP-MS was carried out on 800 grains of oxides (hematite, goethite/limonite, rutile) and sulphides (pyrite, arsenopyrite, galena, sphalerite, chalcopyrite, pentlandite and pyrrhotite) from the ...
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Pyrite | Earth Sciences Museum | University of Waterloo
Back to Rocks and Minerals Articles Kathy Feick Pyrite group of minerals Pyrite Chalcopyrite Marcasite Arsenopyrite Chromate Copper Arsenate Pyrite FeS2 (Isoclinic) Pyrite's name comes from the Greek, pyrites lithos, "the stone which strikes fire." The crystals form in the Isometric System; cubes, octahedrons, pyritohedrons and …
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Kinetics, stoichiometry, and mechanism of arsenopyrite …
The suspension, made by mixing 0.15 g arsenopyrite in 50 ml NaCl and Na 2 SO 3 solution, was treated ultrasonically for 30 s and divided into 9 bottles containing 5 ml each with pH adjusted from ∼1 to ∼9 using HCl and NaOH. Zeta potential measurement for the mixtures was performed by a Litesizer™ 500 instrument (Anton Paar).
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