The critical degree of mineral surface oxidation in copper sulphide
Contrary to chalcopyrite flotation, chalcocite flotation as a function of the degree of surface oxidation was best described by a second-order polynomial function, as expressed by Eq. (2): (2) y = i n t e r c e p t + B 1 X + B 2 X 2. The parameters y a n d x represent chalcocite recovery and the degree of surface oxidation, respectively.
Oxidation-Reduction effects in the flotation of chalcocite …
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 ...
Classification of the Major Copper Sulphides into
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, ...
Oxidation-Reduction effects in the flotation of chalcocite and cuprite
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 …
Predictive Geometallurgical Modeling for Flotation …
The reasons for chalcocite losses in a flotation process are multifaceted and may include galvanic interactions, surface oxidation, and suboptimal flotation …
Use of chelating agents as collectors in the flotation of …
The flotation of malachite is generally similar to that of the copper sulfides, indicating the special effectiveness of copper in the crystal lattice for collector attachment. ... The general order of mineral floatability with these reagents is chalcopyrite = chalcocite > covellite > bornite » pyrite. The flotation of malachite is generally ...
Electrochemical control of chalcocite and covellite-xanthate 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 interactions of thiol collectors with frothers on pyrite, …
Equilibrium contact angle and flotation recovery of chalcocite in the presence of diethyl dithiophosphate at pH 9.2 have been determined as a function of potential, and the relationships compared ...
2-mercaptobenzothiazole and derivatives in the flotation …
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 …
Effect of oxidation treatment on the selective separation of
DOI: 10.1016/j.powtec.2023.119078 Corpus ID: 264398242; Effect of oxidation treatment on the selective separation of molybdenite from chalcocite using flotation @article{Berdakh2023EffectOO, title={Effect of oxidation treatment on the selective separation of molybdenite from chalcocite using flotation}, author={Daniyarov Berdakh …
Increasing selectivity of chalcopyrite and chalcocite flotation from
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 ...
New collectors in the flotation of sulphide minerals: a study …
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 …
Selective flotation of chalcopyrite and molybdenite using …
Flotation results showed that the consumption of H 2 O 2 reagent could be reduced by the addition of FeSO 4 without losing the flotation selectivity. ... Meanwhile, Barzyk et al. (1981) reported that the floatability of chalcocite (Cu 2 S) decreased with increasing surface oxidation using oxygen. However, the oxidation phenomenon and …
Titanium Ore Processing and Beneficiation
High density conditioning in a slightly acid circuit, pH 6.0 to 6.5, with H2SO4, sodium fluoride, and oleic acid actuates the titanium minerals for rapid flotation. This computation effectively rejects the gangue minerals and any apatite. Flotation is in "Sub-A" Flotation Machines with 30-35% solids with fuel oil and a frother added as ...
Froth Flotation of Chalcopyrite/Pyrite Ore: A Critical …
Flotation of chalcopyrite in seawater, pure water, and water with 0.05 M MgCl 2. Particle size 38–75 µm. pH 10 fixed with NaOH. XFGⅡ5-35 microflotation cell. …
CHAPTER 7 FLOTATION OF SULPHIDE MINERALS …
Flotation of chalcopyrite, galena, sphalerite, pyrite. Selective flotation. Pb-Zn bulk flotation. Sulphide minerals are floated by sulphydryl collectors (thio-componds) …
Froth Flotation of Chalcopyrite/Pyrite Ore: A Critical Review
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 ...
(PDF) Preliminary study on collectorless flotation of chalcocite
The data presented in Figs. 2-4 clearly show that there is no flotation of shale, chalcocite and . bornite in pure water. Some pa rticles recover y, after a long time of flotation, points to their.
Cyanide chemistry and its effect on mineral flotation
Flotation recovery as a function of potential for chalcocite, chalcopyrite, and pyrite at pH = 9.2; [EX] = 1.44 × 10 −5 M for chalcocite and 2 × 10 −5 M for other sulphides (Ralston, 1991). In the presence of free cyanide, the surface potential of pyrite may be lower than the xanthate/dixanthogen equilibrium potential, thus inhibiting the ...
The Life Cycle of Water Used in Flotation: a Review
In order to mitigate the negative effect of clay minerals (e.g., kaolinite) on copper-bearing minerals such as chalcocite flotation, …
Electrochemical flotation of sulfides: the bornite
The electrochemical nature of mineral-collector interactions and their relationship to flotation have been investigated to develop a better understanding of the factors controlling sulfide mineral beneficiation. Spectrophotometric and electrochemical techniques have been used to examine the reactions occurring on electrodes composed of a bed of bornite …
CHAPTER 7 FLOTATION OF SULPHIDE MINERALS
Flotation of Chalcocite (Cu 2 S) Chalcocite (Cu 2 S) and chalcopyrite (CuFeS 2) are the two most commonly floated copper sulphide minerals. Bornite (Cu 5 FeS 4) and covellite (CuS) and energite (Cu 3 AsS 4) are normally present in lesser quantities. The complete flotation of chalcocite is achieved between ph = 1 to ph = 10 with ethyl xanthate.
The separation of chalcopyrite and chalcocite from pyrite …
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 ...
Oxidation-Reduction effects in the flotation of chalcocite …
The Action of Potassium n-Amyl Xanthate on Chalcocite. A. Gaudin R. Schuhmann. Chemistry. 1935. 24. Semantic Scholar extracted view of "Oxidation-Reduction effects in the flotation of chalcocite and cuprite" by G. Heyes et al.
Mechanism study on flotation separation of molybdenite from chalcocite
The flotation behaviors of chalcocite and molybdenite as a function of TGA dosage are indicated in Fig. 5. Recovery of chalcocite shows a substantially descending tendency with addition of TGA, while recovery of molybdenite is essentially constant with trivial decline. All this shows TGA is an effective inhibitor for chalcocite.
Classification of the Major Copper Sulphides into
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 …
Minerals | Free Full-Text | Investigating the Influence of the
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
The separation of chalcocite (Cu 2 S) and heazlewoodite (Ni 3 S 2) from high nickel matte can be achieved by maintaining the proper pH and pulp potential while using xanthates as collectors.The flotation recovery of Cu 2 S and Ni 3 S 2 has been studied by adjusting the oxidation–reduction potential of the flotation pulp with (NH 4) 2 S 2 O 8 and KMnO …
Mechanism study on flotation separation of molybdenite from chalcocite
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 ...
Effect of oxidation treatment on the selective …
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% …