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 …
Electrochemical flotation separation of chalcocite from …
DOI: 10.1016/0301-7516(83)90035-2 Corpus ID: 98580861; Electrochemical flotation separation of chalcocite from molybdenite @article{Chander1983ElectrochemicalFS, title={Electrochemical flotation separation of chalcocite from molybdenite}, author={Subhash Chander and Douglas Winston Fuerstenau}, journal={International …
Adsorption of dextrin onto sulphide minerals and its …
The major constituents of the Inco matte, chalcocite (Cu2S) and heazlewoodite (Ni3S2), are separated by differential flotation with diphenylguanidine as collector. To select an effective organic depressant, many dextrins were tested and tapioca dextrin 12 was found to …
Mechanism study on flotation separation of molybdenite from chalcocite
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 …
Effect of oxidation treatment on the selective separation of
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 ...
Froth Flotation Process
"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 …
Managing clay minerals in froth flotation—A critical review
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) …
Minerals | Free Full-Text | Mineralogical Prediction on the Flotation
The copper ore in Chilean copper porphyry deposits is often associated with molybdenum minerals. This copper–molybdenum (Cu–Mo) sulfide ore is generally mined from various locations in the mining site; thus, the mineral composition, oxidation degree, mineral particle size, and grade vary. Therefore, in the mining operation, it is common to …
WO1993022060A1
Modifiers facilitate collection of desired minerals. Modifiers include several classes of chemicals such as activators, alkalinity regulators and dispersants. ... Next, the slurry is subjected to a froth flotation process by which chalcocite is depressed and selectively collected as underflow product, the enargite is collected as the froth product.
2-mercaptobenzothiazole and derivatives in the flotation …
Their specific surface areas were as follows: PbS: 0.48 m2/g, Cu2S: 0.86 m21g, ZnS: 1.83 m2/g. 2-Mercaptobenzothiazole in flotation of galena, chalcocite and sphalerite 1377 Flotation testing Finely ground mineral was pre-stirred for five minutes before the addition of any reagents and it was further conditioned for five minutes after …
The critical degree of bornite surface oxidation in flotation
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 …
The effect of cathodic surface areas on galvanic
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).
Mechanism study on flotation separation of molybdenite from chalcocite
Effects of collectors (butyl xanthate (BX), O-isopropyl-N-sulfur ethyl carbamate (Z-200) and emulsified kerosene), dereagent (sodium sulfide) and depressant thioglycollic acid (TGA) on the flotation of chalcocite and molybdenite were investigated through flotation. The first principle theory was adopted to understand the difference of their surfaces and reaction …
DEXTRINS AS SELECTIVE FLOTATION DEPRESSANTS …
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.
Froth Flotation Process
Conditioning: The ore is combined with water and several flotation reagents, such as modifiers, collectors, and frothers, after it has been processed. This makes the minerals become hydrophobic due to the selective adsorption of collectors, which are surface-active compounds. ... (Cu 5 FeS 4), and chalcocite (Cu2S).
Flotation Conditioners -Modifiers -Activators -Depressants
The goal of flotation is the SEPARATION and RETRIEVAL of the valuable metals from the unwanted minerals and waste rock. Once we have identified the mineral …
Enhancing flotation separation of chalcopyrite and …
The micro-flotation experiments and zeta potential measurements showed that combined depressant consisting of PAAS and GA could efficiently reduce the …
International Journal of Sciences: Basic and Applied …
Modifiers are chemicals used extensively in flotation to modify the action of the collector, making collector action more selective towards certain minerals [3; 7]. Modifiers can be …
Effect of oxidation treatment on the selective separation of
Molybdenite is associated with primary and secondary copper sulfide minerals.Few studies have focused on the selective flotation of molybdenite to separate it from secondary copper sulfide minerals, such as chalcocite.This study evaluated the use of oxidation treatment to separate molybdenite from chalcocite. The effects of oxidation …
Limitations of conventional sulphidisation in restoring the
Hydrogen peroxide (H 2 O 2) (30% w/v), of AR grade, was used to oxidise chalcocite surface. The pH modifiers, hydrochloric acid (HCl) and sodium hydroxide …
Classification of the Major Copper Sulphides into
Empirically arranged flotation domains of chalcopyrite (Cpy), bornite (Bor), chalcocite (Cc), and Covellite (Cov) in terms of Eh and pH values, with Pourbaix …
Chalcopyrite or chalcocite recovery as a function of flotation …
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 ...
(PDF) Thermodynamics of chalcocite dissolving in solutions of flotation …
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 separation of chalcopyrite and chalcocite from pyrite in …
In this study, the differences between the separation of chalcopyrite and chalcocite from pyrite in cleaner flotation after regrinding were investigated. In the rougher flotation prior to regrinding, high chalcopyrite and chalcocite recovery were obtained in conjunction with high pyrite flotation recovery due to the activation of pyrite by copper ions during …
Effect of hydrogen peroxide on selective flotation of chalcocite …
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.
Froth Flotation of Chalcopyrite/Pyrite Ore: A Critical Review
Modifier: hydrogen peroxide (H 2 O 2) at 30% as oxidant. Pyrite and arsenopyrite in demineralized water. Particle size −75 + 38 µm. pH = 6.4 fixed with H 2 …
Principles and practice of sulphide mineral flotation
Current flotation practice often involves the separation of three or four sulphides from the same ore. Industrially important sulphide minerals include galena, chalcopyrite, …
The potential dependence of flotation of chalcocite with …
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 with the corresponding chemisorption isotherms. The initial chemisorbed collector layer rendered the mineral hydrophobic and induced …
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 …
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 …