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Montethe et al. examined hydrogen peroxide in the selective flotation of gold from pyrite with potassium amyl xanthatein (PAX) which showed a high selectivity for gold from pyrite at pH l0 and higher, but with a low increase of recovery [2].In the ores which contain free gold, it may be beneficial to involve selective flotation of the free gold to improve the overall gold …
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The results showed no pyrite and arsenopyrite flotation at pH 11 until CuSO4 (2.5 × 10⁻⁵ mol/l) addition where arsenopyrite displayed remarkably good, CuSO4 concentration dependent flotation ...
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Rose and Newman's very comprehensive book, The Metallurgy of Gold, does not even contain the term refractory in its latest, fourth edition (1937). 1 Dorr and Bosqui's Cyanidation and Concentration of Gold and Silver (2d edition, 1950) has a brief chapter (XIII) on "Cyanicides and Refractory Ores," with only four pages devoted to ...
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Arsenical gold ores: Arsenopyrite can be depressed to promote pyrite flotation by heating the bulk concentrate to 75 °C at a pH of 4.5 in the presence of small quantities of potassium permaganate or disodium phosphate. Alternatively, flotation of pyrite can be achieved using either ethyl xanthate or potassium butyl xanthate as a collector ...
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The results showed no pyrite and arsenopyrite flotation at pH 11 until CuSO4 (2.5 × 10⁻⁵ mol/l) addition where arsenopyrite displayed remarkably good, CuSO4 concentration dependent flotation ...
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A high floatability is desirable for arsenopyrite that is auriferous so as to increase the recovery of gold. When the ore contains gold-poor pyrite and arsenopyrite, a pyrite–arsenopyrite bulk concentrate is recovered first. Further upgrading is accomplished through pyrite flotation and arsenopyrite depression.
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Flotation circuits in commercial gold concentrators are described, along with modern plant practice for various ore types, including refractory gold, arsenopyrite, pyrrhotite, pyrite, telluride ...
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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 ... The most significant item affecting the economics is the amenability of the ore to flotation where gold can be concentrated in a small mass pull ...
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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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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 role in this process allowing …
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Electron microprobe analysis shows that gold occurs in arsenopyrite and pyrite, the gold contents of which can be up to 2700 g/t. The gold and arsenic contents of these minerals are closely ...
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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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Flotation circuits in commercial gold concentrators are described, along with modern plant practice for various ore types, including refractory gold, arsenopyrite, pyrrhotite, pyrite, …
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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 pyrite can be realized by adding a magnesium–ammonium mixture depressant . As we all know, arsenic is a highly toxic substance that causes great ...
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This result correlates well with the assertion that gold particles are finely disseminated and locked up in sulfide minerals such as pyrite and arsenopyrite for sulphidic refractory gold ores [6].
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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. ... It is obvious that the most …
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2, 3 Poor cyanidation results are often obtained when sulfide minerals are present in gold ores. 4 Common sulfide minerals associated with gold ores are pyrite, pyrrhotite, marcasite, copper ...
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The practice of the flotation of pure gold and gold-bearing ores such as tellurides, aurostibite, kerogen, pyrite, pyrrhotite, copper-gold ores and mixed sulphides is reviewed. The …
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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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This pretreatment was applied to an actual refractory gold ore containing arsenopyrite, and it was found that recovery of arsenopyrite increased with sonication time. …
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With improvements in flotation methods, the generally accepted procedure today is to concentrate the gold or silver bearing minerals into a small bulk and roast the concentrate only. ... Recover Gold by Roasting Pyrite Ore. The roasting of straight pyritic ores involves the conversion of the iron sulphides to the oxide under oxidizing ...
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Gold-bearing arsenopyrite and pyrite in refractory ores: analytical refinements and new understanding of gold mineralogy - Volume 71 Issue 2 Skip to main content Accessibility help We use cookies to distinguish you from other users and …
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Research shows pH influences the formation of dixanthogen and pyrite oxidation, consequently affecting the contacting angle and pyrite hydrophobicity, likewise increasing xanthate dosage …
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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. ... 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 ...
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The flotation test of Carlin-type gold ore was carried out at room temperature with tap water. Sulfuric acid and 2# oil were removed, and the remaining test reagents were 1% solution by mass ...
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Gold bonding in arsenopyrite, examined by transmission electron microscopy, is shown to be dispersed within the FeAsS crystal structure. Typical growth patterns and As-Au diffusion …
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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. ... sulphur content was 10.2%, organic carbonaceous matter, 4.4% and gold, 28.6 g/t. The sulphide flotation performance data is ... with pyrite and arsenopyrite. Muscovite ...
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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 [3, 6, 8, 29, 43] interestingly bearing similarities in characteristics and response to chemical treatment [14].Consequently, they exhibit similar performance during froth flotation where differences in …
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positscontainup to 3%pyrite.Size of the gold contained in pyrite ranges from 0.01 to 0.07 m Hydrothermal This type contains a variety of ores, in-cluding: Gold}pyrite ores Gold}copper ores Gold}polymetallic ores Gold}oxideore, usuallyupper zone of sulfide zones The pyrite content of the ore varies from 3% to 90%. Other common waste min-
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Numerous studies have explored the chemical oxidation of gold-bearing pyrite and arsenopyrite sulfides using various oxidizing agents [].Trichlorocyanuric acid (THCC), an organic compound with the chemical formula C 3 N 3 O 3 Cl 3, is a chlorinated isocyanurate.As a cyclic organic chloride containing three chlorine atoms, THCC can compensate for the absence of …
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Several flotation strategies for arsenopyrite have been developed over the last two decades. For refractory gold ores containing arsenopyrite, these flotation techniques have been found to have some limitations. Pretreatment of the ore is necessary to enhance arsenopyrite flotation and thereby increase gold recovery. In the present study, ultrasonic treatment was …
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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 [56,57,58].
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Nanthakumar et al. (2007) investigated the use of microwave energy in pretreating a double refractory gold ore containing 1.56% sulphur and 5.96% total carbon. Wei et al (2009) applied microwave energy in a similar pretreatment of refractory gold ores and reported improvements in the subsequent gold extraction.
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Primary gold-bearing sulfide ore is fine-grained pyrite and arsenopyrite. The paper describes the effects of ratios and dosage of activators and collectors on the recovery and …
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Alternatively using soda ash for pH adjustment can reduce gold depression. Where gold is associated with pyrite in base metal ores where iron sulphides are depressed and report to the tailings, a separate tailings pyrite flotation concentrate should be considered. Producing a pyrite concentrate with associated gold maximizes gold recovery.
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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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