Flotation separation of a chalcocite-pyrite mineral mixture by controlled potential was achieved using ethylxanthate, but the flotation behavior of chalcocite and pyrite from the mixture does not follow the flotation behavior of the individual minerals. That is, the presence of another sulfide mineral alters the flotation behavior with ethylxan­

Abstract. A laboratory study of the batch flotation of chalcocite from chalcocite-quartz mixtures and of cuprite from cuprite-quartz mixtures with potassium ethyl xanthate as collector has shown that the oxidation-reduction state of the flotation pulp can have a pronounced influence on mineral floatabilities. At pH 11 chalcocite floated over a ...

The reasons for chalcocite losses in a flotation process are multifaceted and may include galvanic interactions, surface oxidation, and suboptimal flotation …

For the chalcocite flotation, a 45% maximum recovery in the electrochemical Denver cell is obtained between - 100 and + 100 mV vs. SCE, and this only for solutions containing 100 ppm KEtX. This is related to the presence of Cu-EtX species only as active com- pounds for flotation since from the SACV-results the formation of dixantho- gen on ...

The flotation of four copper sulfide minerals (chalcopyrite, chalcocite, bornite, covellite) and pyrite with xanthates shows that a minimum in the collector concentration necessary for flotation ...

The interaction between chalcocite and various flotation reagents can now be better analyzed since the oxidation and reduction process of the mineral have been delineated. A voltammogram of chalcocite in the presence of octyl hydroxamate is shown in Fig. 3. This voltammogram is characterized by a new peak (A2) at about 150 mV prior …

Flotation of chalcopyrite, galena, sphalerite, pyrite. Selective flotation. Pb-Zn bulk flotation. Sulphide minerals are floated by sulphydryl collectors (thio-componds) …

Flotation tests of pure and mixed minerals indicated that H2O2 treatment reduced the floatability of chalcocite and enargite by forming sulfate and copper hydroxide on their surfaces.

A flotation test was conducted using a Chilean copper ore that contained chalcocite, bornite, and chalcopyrite, and the flotation recovery of each mineral was consistent with the surface ...

COLLOIDS AND A Colloids and Surfaces SURFACES ELS EVI ER A: Physicochemical and Engineering Aspects 122 (1997) 207-225 New collectors in the flotation of sulphide minerals: a study of the electrokinetic, calorimetric and flotation properties of sphalerite, galena and chalcocite G.S. Maier *, X. Qiu, B. Dobias …

Results of flotation tests revealed that selectivity of emulsified kerosene is the best of three collectors in separation of chalcocite and molybdenite, though the others also display excellent ...

Beneficiation of sulphide ores by flotation is ascribed to the natural electrochemical activity associated with sulphide minerals. Flotation is an electrochemical process comprising many interdependent conditions that are difficult to decouple in terms of controlling flotation performance. The extent of electrochemical activity is mineral …

Chalcocite flotation tests showed that the H 2 O 2 treatment significantly reduced the recovery of chalcocite due to the formation of copper hydroxide and sulfate species on the chalcocite surface, which altered its surface hydrophobicity. On the other hand, the low surface oxidation of molybdenite led to high flotation recovery after the ...

The flotation practice and the previous studies have demonstrated that chalcocite flotation can be depressed by the slime coating of clay minerals (Peng and Zhao, 2011; Zhao and Peng, 2012). In this study, how kaolinite coats chalcocite surface and how electrolytes mitigate this coating were studied using electrochemical impedance …

The flotation results for chalcocite in 2 µM KAX indicate that the concentration of adsorbed xanthate was insufficient to reduce the oxidizing effect of H 2 …

A high flotation recovery of 94.7% was obtained for the bornite treated at 0 wt% H 2 O 2.The treatment of bornite at 1 wt% H 2 O 2 led to a flotation recovery of 85.8%, which dramatically decreased to 6.15% at which bornite flotation reached a plateau, the recovery by entrainment, upon the treatment at 2 wt% H 2 O 2.A comparison with the …

The other key factor reported was the pH, which for values between 8 < pH < 11 produced strong chalcocite flotation. The electrochemistry of the chalcocite-xanthate system was investigated by O'Dell et al. (1986). This cyclic voltammetry work concluded that there was a chemisorbed product, ...

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) …

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).

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 ). 4 X. CHEN AND ...

In order to mitigate the negative effect of clay minerals (e.g., kaolinite) on copper-bearing minerals such as chalcocite flotation, Zhao and Peng investigated the effects of saline water. The results showed that chalcocite recovery was increased when the electrolyte concentration was increased, probably due to the reduced kaolinite …

The flotation of chalcopyrite and talc remained above 90% (pH = 2–12), but adding xanthan gum, the chalcopyrite depressed in acid conditions, recovering 10% at pH = 2. This effect disappears at pH = 8, returning to 90% recovery, even with xanthan gum. ... Chalcocite >14: Open in a separate window. Pyrite's flotation range is between pH 3 ...

In order to mitigate the negative effect of clay minerals (e.g., kaolinite) on copper-bearing minerals such as chalcocite flotation, …

the flotation of chalcocite as shown by the ratios being less than one in most cases. pH 5 in DIW shows a particularly high preference for bornite flotation, while pH 3 in DIW and

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 …

However, few studies have focused on separating enargite and secondary copper sulfide minerals, such as chalcocite, using flotation. Chalcocite is the main copper sulfide mineral in oxide and secondary sulfide zones of copper porphyry deposits in Chile [17]. Chalcocite accounts for 30% of the total copper minerals in the oxide zone. This ...

The flotation of copper bearing minerals is always a hot topic in the field of minerals processing. In this paper, the adsorption of a flotation collector, 2-mercaptobenzothiazole(MBT), onto a typical secondary copper sulfide mineral, chalcocite, depending on electrochemical potential was investigated with the help of shell-isolated …

Oxidation treatment with a 10 mM H 2 O 2 solution at a pH of 9 for 20 min resulted in a separation efficiency of 87%, with 98% molybdenite recovery and 11% …

Recoverable economic copper sulphide minerals such as chalcopyrite, bornite, chalcocite and covellite often occur together in varying proportions in the major copper-bearing ores, and have individual flotation requirements and characteristics. Pyrite also occurs in these ores to varying extents as the sulphide gangue, and is problematic …

The flotation of copper bearing minerals is always a hot topic in the field of minerals processing. In this paper, the adsorption of a flotation collector, 2-mercaptobenzothiazole(MBT), onto a typical secondary copper sulfide mineral, chalcocite, depending on electrochemical potential was investigated with the help of shell-isolated …