The recovery of pyrite at 5 min of flotation is 97.8%, and at 7 min of flotation the maximum estimated recovery of 99.1% is reached. In order to produce a concentrate with a pyrite grade closest to 90%, and a recovery above 90%, 3.5 min were selected for the recleaner flotation stage as the optimum flotation time. 3.3.
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 ...
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%.
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 …
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.
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).
Flotation is a cost effective and relatively easy way to concentrate gold locked in sulphides. Simple cyanidation will not leach gold locked in sulphides so flotation is an …
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 ...
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 …
Tarnish on the Mountain copper pyrite tended to prevent flotation. Sulfuric acid was the most effective addition agent in removing the tarnish, and giving good …
Even at optimum pH 6, over dosage of collector will negate flotation selectivity and recover copper as well as iron/lead/zinc. Also …
The selective sulfidation of lead smelter slag with pyrite in the presence of carbon and Na salts, and the flotation behavior of synthetic ZnS were studied. The effects of temperature, time, pyrite dosage, Na salts, and carbon additions were investigated based on thermodynamic calculation, and correspondingly, the growth mechanism of …
The selectivity indexes were 2.65 (CB) and 1.58 (CIB) at the optimal conditions. ... Large quantities of oxidation products are generated on the pyrite surface, thus inhibiting the pyrite flotation in a low-carbon-steel medium. Peng et al. [27] found that the chalcopyrite froth flotation recovery of a high‑chromium alloy (30% chromium) …
As a solid waste, kaolinite-type pyrite flotation tailings (KPFT) are a type of low-quality kaolin that contain impurities, such as iron and titanium. In this study, KPFT were calcined at 800 °C for two hours. The calcined production (CKPFT), which is mainly metakaolin, was used as the silicon and aluminum source to synthesize 4A zeolite …
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 …
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 ...
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 …
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.
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 ...
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 …
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.
B.Tapley et al. researched the inhibition behavior of methylarsonic acid (MMA) on the pyrite/arsenopyrite separation, and they found that MMA can strongly inhibit the arsenopyrite flotation while ...
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 ...
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 ...
The study of Fairthorne et al. indicated that the flotation of chalcopyrite and pyrite at pH 7 increased with the concentration of O-isobutyl-Nethoxycarbonyl thionocarbamate (IBECTC) and that the …
Key fundamental interactions of a surfactin during pyrite flotation investigated and explained. ... This set of experiments has not identified an optimum set of conditions for pyrite flotation using surfactin, and further work is needed in order to optimise concentration, pH, and the potential addition of other frothers to such a mixture. ...
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 ...
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 …
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 …
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 ...
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).
To depress the flotation of copper-activated pyrite, high pH up to 12 with the addition of lime is often applied to promote the formation of hydrophilic Cu (II)/Fe (III) …
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 ...
The CB system performed better than did the CIB system in the flotation separation of chalcopyrite and pyrite. Under the optimal flotation conditions, the Cu grade, S grade, and chalcopyrite recovery of the flotation concentrate in the CB system were 2.90%, 0.70%, and 18.88% higher than those in the CIB system.
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 ...
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.
Although some level of selectivity was achieved at the selected pH and collector concentration, the flotation recovery of both pyrite and arsenopyrite dropped compared with single mineral flotation. Pyrite and arsenopyrite recovery for DTP reduced from 92.85% and 49.61% in the single mineral study to 78.1% and 36.23%, respectively …
Pyrite flotation separation and encapsulation in tailings dams is proposed as a viable way to chemically stabilize tailings. Characterization of potential acid mine …