A mobile flotation facility, based on two 5 L minicells equipped with on-line monitoring of pH, dissolved oxygen and pulp potential, was used to study flotation of pyrite from zinc concentrate (i ...
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Research on the low-potential hydrophobic state of pyrite, with potassium amyl xanthate (PAX) as collector, is reported to help …
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The results of the flotation experiments showed that PCA could selectively depress the flotation of pyrite rather than that of chalcopyrite when using SBX as the collector, and the optimum separation performance was realized at the reagent scheme of 60 mg/L PCA and 15 mg/L SBX when pH was 8.16. Meanwhile, the selective depression …
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The results showed that the flotation recovery of pyrite could be remarkably affected by DO concentration in pulp; it increased first and then decreased with the increase of DO concentration; an optimal DO concentration (DO = 3.3 mg/L) was helpful for pyrite flotation recovery; both the formation of dixanthogen and the avoidance of excessive ...
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Gold grains are observed in a variety of forms, such as coarse-liberated native gold grains, and ultra-fine grains associated with sulfide or non-sulfide mineral …
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Figure 3 shows there is an optimum impeller speed at which (coincident) maximum gold and silver recoveries are both achieved. ... was reported in a recent study on auriferous pyrite flotation ...
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Then, to reach an optimum operational condition in terms of flotation time and reagent usage, a few tests were performed and finally the flotation time of 5 min along with a collector dosage of ...
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In addition, lime is known to be an effective depressant for iron sulfides (especially for pyrite), inducing flotation selectivity in favor of other metal sulfides, which are often present in the same sulfide ores (Sutherland and Wark, 1955, Gaudin, 1957, Klassen and Mokrousov, 1963).
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The correlation between DO concentration and pyrite floatability was established and the optimal DO concentration for pyrite flotation was proposed to further improve the relevant sulfide ore flotation theoretical basis, which had practical guiding significance to some extent for the flotation of sulfide ores, especially pyrite. 2.
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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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no flotation can occur. Contact between particles and bubbles can be accomplished in a flotation cell such as the one shown schematically in Figure 5. Figure 5: Simplified schematic of a conventional flotation cell. The rotor draws slurry through the stator and expels it to the sides, creating a suction that draws air down the shaft of the stator.
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The pyrite flotation results clearly demonstrate that different flotation domains exhibit significantly different pyrite recoveries. Overall, these values are similar to those ... to achieve better liberation or a more optimum particle size distribution is unlikely to result in a relative difference in flotation performance between the ...
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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 …
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In the present work an intense bibliographic search is developed, with updated information on the microscopic fundamentals that govern the behavior of flotation operations of chalcopyrite, the main …
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Pyrite is separated from other minerals mainly by flotation. However, the hydrophilicity of pyrite is affected by many factors, causing it to easily enter the concentrate and consequently reduce the quality of concentrate. Highly efficient pyrite depressants can be selectively adsorbed on the surface of pyrite to improve its hydrophilicity, thereby …
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It appears that pH 7 is the optimal condition for KMnO 4 to depress pyrite flotation. The flotation behavior of chalcopyrite was also examined for comparison. The chalcopyrite recoveries ranged from 80–90% in the pH region of 3–11 (Fig. 2 b). it seems that the pH of the solution had little effect on the flotation of chalcopyrite with ...
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The results of the flotation experiments showed that PCA could selectively depress the flotation of pyrite rather than that of chalcopyrite when using SBX as the collector, and the optimum separation performance was realized at the reagent scheme of 60 mg/L PCA and 15 mg/L SBX when pH was 8.16.
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As studied previously, pyrite flotation was depressed in alkaline solutions, but the addition of copper ions significantly increased pyrite recovery within the pH 6-10 range by activating the ...
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However, in the flotation of pyrite-galena mixtures chitosan selectively depressed pyrite while galena was floated and the optimum separation result was observed around pH 4 (Huang et al., 2013). The difference indicated that when both minerals were present, chitosan preferred to adsorb on pyrite, which was confirmed by ToF-SIMS measurement.
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Does anyone have flotation data defining optimum Eh and pH for arsenian pyrite flotation? Arsenian pyrite contains 0.58% As and is a type p semiconductor.
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Finally, a flotation test was performed to enrich Zn and Pb in the sulfidation product. A flotation concentrate with 8.78% Zn and 9.25% Pb was obtained, and the recovery of Zn and Pb reached 56.14% and 75.94%, respectively. ... reaction time and pyrite dosage. The optimum operating process parameters of sulfidation roasting were determined to ...
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2.1. Effect of Collector Concentration on Flotation Recovery. Xanthates are the salts of xanthic acid (alkyl/aryl dithiocarbonic acid) and are formed through the replacement of two oxygen atoms in carbonic acid by sulfur and replacement of one hydrogen atom by an alkyl/aryl group. 22 They are commonly used as a standard …
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At first, the optimal condition for flotation of pyrite were obtained. In flotation without collector and frother reagents, pyrite recovery was 20.63%. By adding pine oil as frother in two concentrations of 40 ppm and 100 ppm, pyrite recovery reached 55.57% and 57.5%, respectively. Then the flotation was examined with collector and …
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The extensive literature on sulfide flotation indicates that pyrite poorly floats under alkaline condition. Xanthate concentration has a positive effect on pyrite flotation, but above a pH of 11, pyrite seems to be strongly depressed, independently of the concentration in xanthate. In this investigation, aeration and xanthate concentration effects were studied …
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The effect of conditioning time, pH, collector and frother dosage, and a number of flotation stages on grade and recovery of pyrite were studied at laboratory scale, using a fresh tailing sample ...
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The results of the flotation experiments showed that PCA could selectively depress the flotation of pyrite rather than that of chalcopyrite when using SBX as the collector, and the optimum ...
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Under the optimal reagent scheme, flotation recoveries of pyrite, sphalerite and galena vary slightly within a pH range of 4–10. In particular, flotation recoveries of sphalerite and galena collected by CSC-1 stand as high as 76% and 88% respectively over a wide pH range (pH 4–10), while that of pyrite is below 34%.
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At a pyrite flotation plant in South Africa, ... The selection of an optimal flotation reagent scheme is very dependent on the specific mineralogy of the gold ore to be processed (Blaskett and Woodcock, 1953, Elvey and Woodcock, 1985, Woodcock, 1980). 10.1. Refractory Gold Ores.
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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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The flotation of pyrite is pH-dependent, and pH 5 is a boundary value where pyrite has a naturally hydrophobic surface with both negative and positive hydroxy ... it was suggested that the pyrite depression by CMC increases only up to an optimum concentration value. It was documented that in the case of native and oxidized starches, …
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Flotation separation of chalcopyrite from pyrite using lime or cyanides as depressants results in serious problems, such as the blockage of pipelines and environmental pollution. Eco-friendly organics are a future trend for beneficiation plants. In this research, the eco-friendly organic depressant sodium humate (SH) was chosen as a …
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Liu et al. (2009) found that the selective depression of pyrite in the flotation of chalcopyrite-pyrite mixtures was due to the preferential adsorption of lignosulfonate …
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This article reviews the microscopic fundamentals and modern reagents of chalcopyrite flotation, the main copper mineral in nature. It also discusses the effect of pyrite, a non-valuable mineral, and …
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In this study, the effective parameters on the flotation process including grinding condition and chemical parameters were evaluated in order to decrease the active pyrite recovery by flotation. Firstly, optical microscopic and grinding studies were carried out to determine the optimal particle size and grinding time.
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The obtained results show that the optimal pH value is 7, in this condition; we can get an optimal adsorption and maximum recovery of Pyrite up to 90%. Tailings issued from polymetallic ore flotation of Chaabat el-Hamra mine contain sulfides such as Galena (PbS), Pyrite (FeS2) and Chalcopyrite (CuFeS2).
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