Pyrrhotite floats best in acid circuits. The pH range for flotation for gold sulfide ores containing pyrite and arsenopyrite is generally between 7 and 9. Flotation may …
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DOI: 10.1016/j.mineng.2022.107524 Corpus ID: 247889226; Flotation of auriferous arsenopyrite from pyrite using thionocarbamate @article{Forson2022FlotationOA, title={Flotation of auriferous arsenopyrite from pyrite using thionocarbamate}, author={Philip Forson and M. H. A. Zanin and George Blankson Abaka-Wood and …
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A 2 kg/t hydrogen peroxide addition and 120 g/t PAX collector concentration gave the best separation efficiency with 63.1% pyrite and 5.1% arsenopyrite recovery into the flotation concentrate.
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1.. IntroductionGold generally occurs in association with sulphide minerals including pyrite, arsenopyrite and chalcopyrite. Many techniques are used to process gold ores, such as gravity separation, cyanidation and froth flotation (Tapley and Yan, 2003, Allan and Woodcock, 2001).The flotation of free gold and sulphides plays an important …
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The ongoing depletion of gold and silver-containing ore deposits demands a shift towards the processing of more complex sources. Leaching of gold or silver from these sources, which are named refractory and are typically low-grade, can be complicated due to one or more of the following effects: (1) kinetic or thermodynamic impediments on …
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At the ore scale, there is a decline in the concentration of arsenopyrite inclusions, thickness of pyrite rims, and thus gold concentration, from proximal to distal …
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The gold particles of ALRG gold ore are almost wrapped by pyrite and arsenopyrite, and the direct gold leaching extent is less than 40 %, making it an extremely refractory gold ore. The ore sample in this study has an extremely low gold content of 0.85 g·t −1, iron content of 3.21 %, sulfur content of 2.27 %, and arsenic content of 0.19 %.
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Gold-bearing arsenopyrite and pyrite in refractory ores: analytical refinements and new understanding of gold mineralogy - Volume 71 Issue 2 22 August 2024: Due to technical disruption, we are experiencing some delays to publication.
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Gold-bearing arsenopyrite and pyrite in refractory ores: analytical refinements and new understanding of gold mineralogy - Volume 71 Issue 2 22 August 2024: Due to …
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In order to overcome the difficulty of extracting gold from gold-bearing sulfide ore by cyanide process, flotation was adopted based on mineralogical analysis. Mineralogy shows that gold particles are of superfine structure and mainly enclosed by sulfide ores. Primary gold-bearing sulfide ore is fine-grained pyrite and arsenopyrite. The paper …
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This study deals with an ore containing coarse and fine free gold associated with arsenopyrite, pyrrhotite, pyrite and graphite in a quartz and slate gangue. The sulphides and graphite constitute 10 to 12% of the ore. Treatment required utmost economy. The flowsheet was developed from batch and pilot tests with the required …
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Chalcopyrite–pyrite ore flotation tailings (dump-drain system) A. ferrooxidans, A. thiooxidans, T. thioparus, L. ferrooxidans, SRB: d) ... Biooxidation in the presence of A. ferrooxidans is used in the liberation of encapsulated gold particles from arsenopyrite which undergoes dissolution.
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Flotation is also the best method for recovery of gold from base metal ores and gold-containing PGM ores. Excluding gravity preconcentration, flotation remains the most …
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3.3. Conventional roasting of flotation concentrate. Roasting in the auriferous industry involves the heating of complex or refractory gold concentrates containing sulphides (mainly pyrite and arsenopyrite) and carbonaceous materials in air to produce volatile arsenic xide (As 2 O 3), sulphur dioxide (SO 2) and carbon dioxide (CO …
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A typical example of a mixed gold ore is one having some level of free or native gold occurring with the remainder being associated with ... smelting). Mixed pyrite-arsenopyrite flotation concentrate, from a given refractory ore, is achieved conventionally with relative ease owing to similarities in flotation response and electrochemical ...
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The following possibilities exist in the case of sulfidic gold ores: • Bulk sulfide flotation for further treatment (ultrafine grinding [UFG] ... Separation of gold-bearing arsenopyrite from barren pyrite. When attempting to concentrate submicroscopic and in particular solid–solution gold, it is important to keep in mind the following two ...
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Gold ores containing sulphides and carbonaceous matter are difficult to treat depending on the refractory components present and their association with the gold particles. ... pyrite and arsenopyrite. The release of carbon, sulphur and arsenic was monitored, and the changes in preg-robbing behaviour of the concentrate were also …
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Micron-scale (2–10 μm) remobilized gold is accompanied by fine particles (200 nm–2 μm) and nanoparticles (<200 nm) of gold. The extensive variation of Au …
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Gold can be recovered through bulk flotation or selective flotation processes according to the distribution of gold in pyrite and arsenopyrite [24,25]. The selective flotation of arsenopyrite from …
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The selective flotation of pyrite from arsenopyrite was achieved at around pH 11, employing HTA without using any regulators to depress arsenopyrite. ... Gold was recovered from one copper-bearing ...
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Semantic Scholar extracted view of "Decoupling pyrite and arsenopyrite in flotation using thionocarbamate collector" by P. Forson et al. ... Abstract High-efficiency beneficiation of low-grade gold ore becomes an inevitable trend with the depletion of high-grade gold ore. The work innovatively proposed a novel beneficiation process for a …
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In complex auriferous ores, pyrite and arsenopyrite are the main hosts of gold. Pyrite and arsenopyrite are often found in close association with each other in this ore type ... (Fig. 3 b) and could imply that there was simultaneous flotation of gold-rich arsenian pyrite with barren sulphides. Thus, a much more complex mineralogical …
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ABSTRACT Four oxidants, NaClO, KMnO4, K2Cr2O7, and H2O2, were used to promote the flotation separation of pyrite (FeS2) from arsenopyrite (FeAsS). Ore flotation results indicate that H2O2 has the best selectivity for the As-S separation. When H2O2 is used, the As content in pyrite concentrate decreases from 2.27% without …
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The results showed no pyrite and arsenopyrite flotation at pH 11 until CuSO 4 (2.5 × 10 −5 mol/l) ... 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 sulphidic phases.
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lue in the ore. Pyrite and arsenopyrite are the main Au-bearing ... 1,2 The flotation technology in the gold ore processing industry has experienced a remarkable development in recent years. 3, 4 ...
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The preferential concentration of valuable metals such as gold in arsenopyrite in comparison to pyrite drives current research interest, despite challenges associated with separating arsenopyrite from pyrite during froth flotation (Asamoah et al., 2019b, Beattie and Duteroue, 1992, McCarthy et al., 2018, Zhang et al., 2016).
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Notwithstanding, in the separation of gold bearing sulphides during froth flotation, a concentrate made up of both pyrite and arsenopyrite is obtained due to their similar characteristics and ...
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The type of gold hosted by sulfide matrices like pyrite and arsenopyrite is known as refractory ores [50]. Previous studies showed that the direct leaching of refractory ore leads to low gold ...
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Separation of gold predominated arsenopyrite minerals from less economical pyrite phase maximises downstream unit feed and improves financial performance of the …
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Ores with invisible gold are characterized by trace amounts of gold hosted in sulfide minerals (from a few parts per million to several thousand parts per million), predominantly pyrite and arsenopyrite (Cook and Chryssoulis, 1990), and this is now a common resource for the gold mining industry.
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