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2016.1.1 Flotation circuits in commercial gold concentrators are described, along with modern plant practice for various ore types, including refractory gold, arsenopyrite,
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2023.8.1 Abstract. Thionocarbamate, specifically modified Isopropyl Ethyl Thionocarbamate (IPETC) is selective in the separation of pyrite from arsenopyrite,
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2020.1.1 The role of gold in arsenopyrite increases with depth. Ores are of the gold-quartz-sulfide type. Quartz in ore up to 90 %, sulfides from 3 to 5 %. The content of
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The structural chemistry of gold in arsenian pyrite (FeS 2) and arsenopyrite (FeAsS) is as yet unknown, despite the economic importance of this
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2020.8.5 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...
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2019.4.16 Mineralogy and Geochemistry of Pyrite and Arsenopyrite from the Zaozigou Gold Deposit in West Qinling Orogenic Belt, Central China: Implications for Ore
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2012.1.25 J. Chen, Y. Chen, Z. Wei, and F. Liu, Bulk flotation of auriferous pyrite and arsenopyrite by using tertiary dodecyl mercaptan as collector in weak alkaline pulp,
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Flotation performance of gold-bearing pyrite in refractory gold ores depend upon the interplay among process water chemistry, grinding chemistry, and ore mineralogy. The
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2023.12.23 1. Introduction Pyrite and arsenopyrite are the most important mineral phases in sulphide refractory gold ores due to their associative property in hosting gold
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2018.4.15 The recovery of gold associated with arsenopyrite and pyrrhotite has a similar response pattern from both collector and pH viewpoints as illustrated in Figures 8 and 9. It is sometimes desired to
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6 天之前 The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides. This type of gold is typically very fine gold or locked in solid 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.
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2021.6.1 Thionocarbamate collectors are noted for their high flotation selectivity against pyrite under alkaline condition. In this study, selectivity of O-isopropyl-N-ethyl thionocarbamate (IPETC) is investigated in decoupling flotation response of pyrite and arsenopyrite under single mineral and artificial composite systems.The influence of
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2016.1.1 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 be carried out at higher pH values of 9–10, since this favors the depression of talc minerals and avoids the use of expensive gangue depressants.
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1997.9.1 Pyrite and arsenopyrite are the most common hosts for invisible gold, but pyrite and arsenic are refractory during conventional sulfide oxidation, which significantly challenges subsequent gold extraction. One option is high-temperature pretreatment of arsenical materials to sequester > 90% of the arsenic as a gas, then convert it to a stable
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2022.6.13 The largest gold ore object in Kazakhstan is the Vasilkovskoye deposit, 17 km northwest of the city of Kokshetau. The Vasilkovskoye deposit belongs to the gold-quartz moderately sulfide formation. The main ore minerals of primary ores are arsenopyrite, pyrite, bismuth minerals and native gold. Arsenopyrite sharply predominates of all the minerals.
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2022.5.15 The flotation recovery of arsenopyrite far exceeded that of pyrite with the addition of 50, 150 and 300 mg/l CuSO 4 concentration, in conformity with flotation behaviour reported in single mineral study (Forson et al., 2021a). As discussed in the preceding section, a change of the nature of IPETC interaction at high pH (>11) may be
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2021.6.1 1. Introduction. Flotation is often used as a preconcentration step in processing of auriferous refractory ores [11, 19] .The process separates valued mineral sulphides into a froth concentrate, mostly predominated by pyrite and arsenopyrite [6].These minerals hosts fine-grained gold particles encapsulated in their matrix [7] often requiring
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2021.1.1 The flotation of auriferous pyrite is of great importance in gold mining industry. Gold occurs at micro grain size, colloidal or solid solution in pyrite (Cook and Chryssoulis, 1990). Concentrating pyrite as much as possible, therefore gold, at the flotation stage is the main goal of flotation plants in gold mines.
More2022.12.21 The activation properties of ammonium oxalate on the flotation of pyrite and arsenopyrite in the lime system were studied in this work. Single mineral flotation tests showed that the ammonium oxalate strongly activated pyrite in high alkalinity and high Ca2+ system, whereas arsenopyrite was almost unaffected. In mineral mixtures tests, the
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2016.7.13 REAGENTS USED IN FLOTATION OF GOLD ORES. Conditioning agents are commonly used, especially when the ores are partly oxidized. Soda ash is the most widely used regulator of alkalinity. Lime
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2005.1.1 In the industry, the flotation of gold-bearing pyrite is operated in a broad range of pH and collector concentration with different types of grinding media. Following the previous study at pH 5.0 and 7.0, the current study investigated the interaction of grinding media with collector and its effect on pyrite flotation at pH 8.5.
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Mineralogical Investigation of Gold Ores. S.L. Chryssoulis, J. McMullen, in Gold Ore Processing (Second Edition), 2016 3.3.8 Response to Ultrafine Grinding CIL. UFG of pyrite concentrates for subsequent leaching is used in ores, where refractoriness to direct cyanidation arises from fine to ultrafine (0.02 μm) gold mineral inclusions in the
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1994.7.1 PREFERENTIAL DEPRESSION-FLOTATION Many gold bearing ores consist of mixtures of sulphides and hence it is often necessary to carry out a differential flotation which may involve the selective depression of one or more ores. Pyrite-Arsenopyrite It is often found that gold is associated with arsenopyrite in a pyrite-arsenopyrite system
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2021.10.30 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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2010.10.1 Gold 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 role in this
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Abstract. Problem ores that yield low (say less than 80%) gold recovery by cyanidation when “normally ground” are defined as refractory. The term, as well as the technical methods used to treat such ores, are relatively new. Rose and Newman’s very comprehensive book, The Metallurgy of Gold, does not even contain the term refractory in its ...
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2004.8.15 Gold in such refractory sulfide ores is preferentially associated with the arsenopyrite matrix. Separation or selective depression of pyrite from arsenopyrite becomes imperative in order to achieve economical extraction of gold. ... Differential flotation of the pyrite–arsenopyrite mixture was carried out by interacting 0.5 g each of the two ...
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2018.10.23 als and the gold. The sulfide minerals with which gold is associated are typically pyrite and arsenopyrite. Flotation of sulfide minerals from refractory gold ores is crucial because it is directly linked to gold recovery (Teague et al. , 1998). The concentrate can then be pretreated by processes such as fine
More2016.8.1 Refractory gold ores are classified as if a cyanidation process cannot recover more than 80% of gold even though fine grinding is used (Guay, 1981). The reason for the refractoriness of gold ores is either because gold is hosted in solid solution, or as colloidal particles, in pyrite and/or arsenopyrite.
More2023.3.28 occurs mainly as submicroscopic gold in arsenopyrite and pyrite and is recovered by roasting a flotation concentrate followed by cyanidation (Wang et al., 1994). gold orEs and MinErals According to the mode of occurrence, gold is classified as three categories: microscopic gold, submicroscopic gold and surface-bound gold (Table 2). Gold
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During flotation processing of polymetallic ores, gold is simultaneously recovered in appropriate concentrates (copper, zinc, etc.). The extraction of gold into copper and zinc concentrates is from 30 to 35 %, the remaining gold goes into pyrite concentrate and 10-15 % into dump tailings. We have established the optimal regime of the flotation ...
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2019.9.1 The depression mechanism involving Fe 3+ during arsenopyrite flotation is a complicated process that requires a combination of techniques to understand. This work discussed changes at the arsenopyrite/water interface and the mineral surface following treatment with Fe 3+, and their implications for arsenopyrite flotation.
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2014.6.5 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
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2020.6.1 Flash flotation concentrate containing sulphides and carbonaceous matter has been studied for roasting behaviour under microwave irradiation. The major minerals present in the concentrate were quartz, pyrite, arsenopyrite and muscovite. Thermogravimetric analysis indicated a total loss in mass of 24.5%. The mass loss
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In the case of mesothermal pyritic gold ores, pyrite and arsenopyrite are sufficiently coarse grained, which allows for good liberation at modest grind fineness (P 80 of 75–120 μm) and results in high-grade concentrates with good recoveries. In some of these ores, submicroscopic gold is exclusively carried by arsenopyrite, which makes separation
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2020.6.1 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 trioxide (As 2 O 3), sulphur dioxide (SO 2) and carbon dioxide
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Gold–antimony ores usually contain stibnite (1.5–4.0% Sb), pyrite, arsenopyrite gold (1.5–3.0 g t −1) and silver (40–150 g t −1). Several plants in the USA (Stibnite, Minnesota and Bradly) and Russia have been in operation for some time. There are two commercial processes available for treatment of these ores. •
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Flotation of Gold Ores. Srdjan M. Bulatovic, in Handbook of Flotation Reagents: Chemistry, Theory and Practice, 2010 17.10 Flotation of Arsenical Gold Ores. There are two major groups of arsenical gold ores of economical value. These are the massive base metal sulphides with arsenical gold (i.e. the lead–zinc Olympias deposit, Greece) and arsenical
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2014.6.1 Abstract. The occurrence of gold (Au) in pyrite and its effects on the electronic and structural details were investigated by performing first principles calculations based on density functional theory (DFT). It was found that gold would most likely exist in pyrite by incorporating into interstitial lattice sites and by substituting for S atoms.
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