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The electrochemistry of chalcocite with ethyl xanthate reported by Heyes and Trahar (1979), concluded that chalcocite flotation was strongly dependent on the Eh, ... For this reason it is common to see the use of lime as a pH modifier in a copper circuit to reject pyrite. 2.2. Case 2: Copper and iron sulphide minerals with an arsenical tenor
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Since the electrochemistry of the sulphide mineral/aqueous solution interface and of various sulphide mineral/aqueous thio-compound systems has been amply investigated over the …
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Some emerging challenges include the use of nanoparticles and new rheology modifiers. ... (CuFeS 2), chalcocite (Cu 2 S), covellite (CuS), bornite ... In copper and lead flotation it has been found that the recovery of non-metallic gangue is increased between 5% when having a particle size of 40 μm to 20–30% in particles of 10 μm ...
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Nowadays, froth flotation of chalcopyrite ore has developed a large number of reagents that make it possible to improve the mineral's buoyancy conditions, both in …
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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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Chalcopyrite or chalcocite recovery as a function of flotation time in the presence and absence of bentonite (a) and zeta potentials of the three minerals (b) (Peng and Zhao 2011).
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As the iron content in the copper sulfide mineral becomes reduced, e.g. from chalcopyrite to bornite to chalcocite, the lower Eh is preferred for flotation [13]. Quite amount of Eh modifier, typically sodium hydrosulfide, has to be consumed in molybdenum circuit [14], [15], [16]. One of the obstructions are the lack of in-situ techniques to ...
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Download scientific diagram | Chalcopyrite or chalcocite recovery as a function of flotation time in the presence and absence of bentonite (a) and zeta potentials of the three minerals (b) (Peng ...
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The nature of the change in the chalcocite electrode potential depending on the type of modifier and storage device, as well as on pH, has been experimentally clarified.
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Therefore, depression of pyrite is desirable in the concentration of base metal sulfides by flotation. This can be achieved by floating in alkaline solutions (lime) using highly selective inorganic modifiers such as cyanides, sulfites, ferrocyanides and cyanides in combination with zinc sulfate (Fuerstenau et al., 1985).
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The micro flotation test was executed in a Plexiglas cell (40 mL). 2 g single mineral sample was used in every single test, then it was ultrasonically cleaned for 5 min with 20 mL distilled water to remove the oxidation layer covered on the surface.In determining the influence of collectors on selective flotation of chalcocite and …
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flotation of the investigated sulfides appears at a rather high, about 20 kg/ton, admixture. When either N- or G- dextrins were added, chalcocite was more sensitive to depression than galena. S-dextrins depressed neither galena nor chalcocite. Fig. 1. Flotation of chalcocite in the presence of various dextrins (pH = 6.4-7.2) Fig. 2.
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In this context, this study investigated the effect of hydrogen peroxide (H 2 O 2) treatment on the flotation behavior of chalcocite and enargite. ... It is proposed that oxidizing reagents as surface modifiers could selectively change the flotation behavior of the minerals involved in the concentration process. Hence, it is essential to ...
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Flotation of chalcopyrite, galena, sphalerite, pyrite. Selective flotation. Pb-Zn bulk flotation. Sulphide minerals are floated by sulphydryl collectors (thio-componds) Adsorption of …
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"The single most important method used for the recovery and upgrading of sulfide ores", that's how G. J. Jameson described the froth flotation process in 1992. And it's true: this process, used in several processing industries, is able to selectively separate hydrophobic from hydrophilic materials, by taking advantage of the different categories …
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The flotation of chalcocite, bornite, chalcopyrite, and pyrite in an electrochemical-flotation cell. In: XVth International Mineral Processing Congress, tome II, 1985. p. 198–210. Google Scholar Gebhardt J.E. and others. Electrochemical conditioning of a mineral particle bed electrode for flotation.
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It was revealed that all the Cu (II) oxidation species on chalcocite were sulphidised to the desired Cu (I)-S product at the lower potential of −0.20 V. Intriguingly, …
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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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Specific flotation separations are as follows.•Copper sulphides such as chalcocite and copper oxides such as cuprite could be floated from enargite at pH 11 after setting the potential to about ...
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This paper presents both the fundamentals of sulphide mineral flotation and the practical aspects of sulphide ore flotation. The fundamental aspects of the flotation of sulphide minerals both in the absence and presence of thiol collectors are discussed in relation to their crystal structure, surface chemistry and electrochemical characteristics. Since the …
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The subject was reviewed by Lotter and Bradshaw in 2010, and proposed a synergy between ideally-selected different reagent types to deliver improved …
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2.3. Chalcocite grinding and flotation. Crushed chalcocite, 100 g, was wet ground in a stainless steel grinding mill using stainless steel rods to obtain a P 80 = 106 µm. After grinding, the slurry was transferred to a mechanical flotation cell of 1.5 dm 3.Using the pH modifiers, the pulp pH was adjusted to 9.5, which was maintained throughout …
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This can be achieved by floating in alkaline solutions (lime) using highly selective inorganic modifiers such as cyanides, sulfites, ferrocyanides and cyanides in combination with ... (Ni 3 S 2) in the flotation of chalcocite in the processing of INCO matte with amyl xanthate at a pH of 11.7. Reports on the use of dextrin as a depressant …
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Flotation reagents are significant for modifying the interfacial characteristics of mineral grains to achieve the effective separation of minerals. Since the 1960s, when quantum chemistry was first introduced into the study of flotation reagents, many achievements have been made, although some controversial topics remain. The …
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To understand froth flotation, first read that article and come back to read about sequential flotation of Copper, Lead and Zinc.. Given a baseline amount of frother ...
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Review on the application and research progress of chalcopyrite materials in the field of energy storage. Xiaofan Fu, ... Wei Dong, in Journal of Energy Storage, 2024. 2.1.1 The ore-forming mechanism of natural CuFeS 2. Natural chalcopyrite is a copper iron sulfide mineral with a chemical formula of CuFeS 2.Natural chalcopyrite is a copper-iron sulfide …
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The iron-contamination from oxidation of chalcopyrite had little effect on the flotation. ... chalcocite-like at −165 mV and covellite-like at −315 mV, were proposed to form on the oxidised chalcopyrite. ... The pH modifiers were used to adjust and maintain the pulp pH at 9.5. Air bubbles were generated by introducing air into the flotation ...
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The ready availability and relatively low cost of lime makes it the preferred pH modifier used in the flotation of these ores. Dosage and addition points of lime in the circuit require however careful consideration for a cost-effective use of lime. ... (1985) showed that the flotation of chalcocite, bornite, chalcopyrite and pyrite with ...
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Although basic porphyry copper flotation and metallurgy has remained virtually the same for many years, the processing equipment as well as design of the mills has continually been improved to increase production while reducing operating and maintenance costs. Also, considerable attention is paid to automatic sensing devices …
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The nature of the change in the chalcocite electrode potential depending on the type of modifier and storage device, as well as on pH, has been experimentally clarified. The differences in the collective action of a one-component accumulator and a mixture of flotation reagents were revealed based on the thermodynamics analysis of …
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galena, chalcopyrite, sphalerite, pyrite, chalcocite and molybdenite. Traditionally, these minerals have been separated from each other using relatively simple flotation schemes to process high-grade, coarse-grained ores. Because of the depletion of these easy-to-process ores, however, flotation scientists and engineers are
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The increased chalcocite flotation recovery with an increase in chalcocite oxidation found in this study could be explained by the formation of copper hydroxide (Cu(OH) 2) via initial surface oxidation as shown in Reaction (8) (Fullston et al., 1999).
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