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Mineral, metal values, and by-products can be recovered by flotation separation. The economic aspect of the recovery of useful valuable minerals (such as gold), contributing to recycling meanwhile with environmental technology and wastewater treatment, was enlightened, for instance, of gold from arsenic-rich auriferous pyrite …
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By separating the pyrite from the tailings by flotation during the final years of operation of a plant, two fundamental aspects could be achieved: (1) a neutral tailings can be produced …
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The gold contained in copper ores is an important resource for the gold industry. In some cases, elemental gold is present and can be recovered by selective flotation. It has been reported that the gold grade and recovery can be increased, without sacing the copper recovery, by replacing AERO 3477 (diisobutyl dithiophosphate …
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Abstract. Treating high-pyrite-containing ores has been problematic in copper flotation plants where selective separation of copper minerals from pyrite is challenging to achieve. Raising pulp pH is common for pyrite depression when pyrite feed grade is low. Whether raising pulp pH can equally depress pyrite in copper flotation when pyrite …
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Bench-scale flotation tests confirmed the feasibility of selective separation of gold from pyrite by using hydrogen peroxide as an oxidizing agent and amyl xanthate as collector.
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The synergistic effect of lime (CaO) and TCSS caused a strong depression of pyrite through its flotation separation from chalcopyrite in a wide pH range of 7–12. The …
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Copper sulphate is frequently helpful in accelerating the flotation of pyrite and arsenopyrite. In rare instances sulphuric acid may be necessary, but the use of it is …
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These particles may be separated from the oxides of iron by washing, and the use of nitric acid, followed by panning, is frequently resorted to in order to detect gold in pyrites. Moreover, although usually invisible, gold can sometimes be seen in unroasted pyrites.
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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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Pyrite depression in the flotation of copper ores is difficult due to the activation of Cu2+ ions on pyrite surface. In this study, the radical chain reaction involving the redox cycling of Cu(I/II) induced by sodium metabisulphite (MBS) was exploited to selectively depress the flotation of copper-activated pyrite at pH 8.0. Electrochemical …
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Bench-scale flotation tests confirmed the feasibility of selective separation of gold from pyrite by using hydrogen peroxide as an oxidizing agent and amyl xanthate as collector. At values of pH 8 depression of pyrite increased significantly, while the high recovery of gold remained practically unchanged. Recommended articles.
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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. The addition of hydrogen peroxide (2 kg/t) had a minor effect on the mineral surface oxidation state according to XPS analysis.
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Pyrite flotation separation and encapsulation in tailings dams is proposed as a viable way to chemically stabilize tailings. Characterization of potential acid mine generation in tailings led to an innovative process in which acid-generating pyrite is separated by flotation from the coarse tailings and incorporated into the slime zone. …
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Effective methods for selective separation using flotation or flocculation of arsenopyrite from pyrite by biomodulation using Acidithiobacillus ferrooxidans are presented here. Adhesion of the bacterium to the surface of arsenopyrite was very slow compared to that to pyrite, resulting in a difference in surface modification of the …
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A satisfactory separation of chalcopyrite and pyrite was achieved at weakly alkaline condition (pH 8), at which the flotation recovery of chalcopyrite was 86.11% and that of pyrite was only 13.85%.
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Flotation preconcentration of gold-bearing sulfides (pyrite and arsenian pyrite) from many Carlin-type refractory gold deposits are challenging, with low recovery and poor …
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Gold and pyrite separation by flotation could possibly be achieved in this system due to the significant differences in hydropho- bicity found between gold and pyrite (Figs. 4 and 5). Fig. 6 shows the results of measurements of the electrophoretic mobility of pyrite as a function of pH for different conditions of superficial oxidation, in the ...
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Natural arsenopyrite and pyrite samples used in this study were obtained from Yunnan Province, China. The elemental compositions of mineral samples are shown in Table 1.High-purity samples were manually selected and ground to −75 μm, of which the −75 + 38 μm particles were used for flotation tests, plasma modification pulp chemistry …
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Arsenopyrite Gold Recovery. Having some arsenopyrite in your gold ore sample does not insure a full refractory gold processes is needed for recovery. The presence of arsenopyrite and heavy …
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Inorganic or organic depressants are normally applied to selectively depress pyrite flotation, as shown in Table 1 [8], [9].However, the application of these reagents increases the potentials in environment pollution [9].In recent years, various oxidizing strategies have been carried out to achieve a selective flotation separation by …
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Due to many problems such as pipe blockage, environmental pollution, and the difficulty of recovering precious metals, caused by extensive use of lime, the conventional program using lime (CaO) as the inhibitor and xanthates (e. g., sodium butylxanthate) (BX) as the collector has become increasingly restricted in use, and lime …
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The Complex zoning of arsenian pyrite posed a challenge to its separation from pyrite. Abstract. Thionocarbamate, specifically modified Isopropyl Ethyl Thionocarbamate (IPETC) is selective in the separation of pyrite from arsenopyrite, following copper activation. ... (Fig. 3 b) and could imply that there was simultaneous …
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DetailsREAGENTS 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 …
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The four flotation concentrates were combined and reground in a rod mill with stainless steel grinding media. The total weight of grinding media was about 10.3 kg.Particle size P 80 = 20 μm was achieved by adjusting the grinding time. The size distribution was determined by Laser Diffraction with a Malvern MasterSizer (Malvern Instrument Ltd., …
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It was found that free cyanide depressed gold and silver flotation through their carrier, pyrite. Cuprous cyanide mainly in the form of Cu(CN)32− depressed pyrite flotation similarly as free ...
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Resembled with the flotation results of copper concentrate containing tennantite, the separation possessed the best result at alkaline condition (pH 11) at where the arsenic content was reduced ...
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To effectively separte pyrite from chalcopyrite, tetrazine thione group and hydrocarbon chain were combined to synthesize tetrazine thione collectors. The flotation performance of tetrazine thione collectors on chalcopyrite and pyrite was investigated, and the influence of different hydrophobic groups on the flotation performance was …
DetailsAs an environmentally-friendly reagent, FeCl 3 might exhibit a potential inhibition against pyrite during its flotation separation from sphalerite [41]. In this study, using 4-amino-5-pentyl-1,2,4-triazole-3-thione (APTT) as a collector, the floatability of sphalerite and pyrite was explored through micro-flotation tests.
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In this study, the surface modification of arsenopyrite and pyrite with low temperature oxygen plasma was developed as an effective approach to improve the flotation separation efficiency of minerals. The micro-flotation experiments results indicated that plasma pre-treatment can achieve selective flotation of arsenopyrite from …
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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 …
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Due to the drawbacks of copper ions used to activate pyrite flotation in gold processing plants where free cyanide occurs in process water and the benefits of lead ions in gold cyanidation, this ...
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Two-stage flotation (copper and pyrite rougher stages) at a p80 of 70 µm indicated that high gold (95.2%) and copper (97.4%) recovery can be achieved, but the levels of pyrite in the concentrate ...
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flotation response. Separation of gold predominated arsenopyrite minerals from less economical pyrite phase maximises downstream unit feed and improves financial performance of the operation. This paper briefly reviews attempts made thus far in exploiting subtle differences between pyrite and arsenopyrite for separation.
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copper-gold sulfide ore from pyrite under Z200 flotation system, and the separation mechanism under this flotation system remains unclear. In this work, a lime-free, eco-friendly reagent scheme that uses Z200 as collector and PGA as inhibitor was creatively adopted for the flotation of copper-gold sulfide ore in Daye, Hubei Province, China.
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