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modifiers for chalcocite flotation

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modifiers for chalcocite flotation

Flotation of an Oxidized Copper Sulfide Ore

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 ...

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Managing clay minerals in froth flotation—A …

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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Enhancing flotation separation of chalcopyrite and …

Effect of modifiers on flotation of serpentine and talc mixed minerals at pH = 7, c(PBX) = 80 mg/L, talc: − 150 + 37 μm, serpentine: − 10 μm. Full size image. Figure 3 showed the effect of ...

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The Importance of pH in Flotation

In flotation, pH control is a vital method to control selective mineral separation. A standard depressant that is used is an Alkali. An Alkali is any substance that when mixed with Acid will neutralize each …

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Principles and practice of sulphide mineral flotation

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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Principles and practice of sulphide mineral flotation

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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Electrochemical behavior of chalcocite exposed to 2

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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Pyrite depression by dextrin in flotation with xanthates.

The previous flotation experiments with heazlewoodite (Ni3S2) and chalcocite (Cu2S), two major constituents of the Inco matte, revealed that the heazlewoodite flotation was strongly depressed by ...

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Limitations of conventional sulphidisation in restoring the

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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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.

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Limitations of conventional sulphidisation in restoring the

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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Effect of hydrogen peroxide on selective flotation of chalcocite …

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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The effect of cathodic surface areas on galvanic interactions …

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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Principles and practice of sulphide mineral flotation

Mechanisms of the action of various flotation reagents, including collectors, activators and depressants, commonly used in sulphide mineral flotation are discussed in terms of the …

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Mechanism study on flotation separation of molybdenite from chalcocite

Flotation responses of chalcocite and molybdenite as a function of pH. ... The experimental studies of grinding fineness, the amount of roughing modifier, depressant and collector were completed ...

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The effect of clay minerals on the process of flotation of copper ores

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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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 …

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Dextrin as a non-toxic depressant for pyrite in flotation with

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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Lime use and functionality in sulphide mineral flotation: A …

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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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 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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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 …

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Lime use and functionality in sulphide mineral flotation: A …

This paper reviews: lime preparation factors that influence the reagent performance properties; mechanisms of lime interaction with collector chemicals and …

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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 …

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Control of Non-Ferrous Metal-Sulfide Minerals' …

Studies on the dependence of the technological results of non-ferrous sulfide ore (copper—arsenic-bearing and non-arsenic-bearing—lead–zinc, and polymetallic) flotation on the pulp potential Eh …

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Copper Flotation

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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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 …

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Electrochemistry of Flotation of Sulphide Minerals

"Electrochemistry of Flotation of Sulphide Minerals" systematically covers various electrochemical measurements, especially electrochemical corrosive methods, electrochemical equilibrium calculations, surface analysis, semiconductor energy band theory as well as molecular orbital theory. Behaviour and mechanism of collectorless …

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Principles and practice of sulphide mineral flotation

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 Life Cycle of Water Used in Flotation: a Review

Due to the limitation of freshwater sources and increasingly stringent disposal standards [13, 74, 79], the minerals industry has attempted to increase water use efficiency, reduce freshwater utilization, and minimize water discharge, or seek alternatives to fresh water [57, 59, 78, 84, 101].It is widely accepted that flotation is the most …

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The selective flotation of enargite from other copper …

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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