Limitations of conventional sulphidisation in restoring the
The flotation of chalcocite was conducted under various surface conditions, unoxidised, oxidised and sulphidised. The unoxidised chalcocite yielded a very high final …
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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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Froth Flotation of Chalcopyrite/Pyrite Ore: A …
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 the presence of ions that simulate the use of seawater or …
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Froth Flotation Handbook
Thus a copper ore consisting of chalcocite in a gangue of rock-forming silicates will yield, under a given method of treatment, a higher grade of concentrate and show a higher ratio of concentration than another copper ore of identical copper content, in which the copper mineral is chalcocite, but in which pyrite is associated with the other ...
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Selective flotation of enargite and chalcopyrite | Request PDF
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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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 ...
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Basic Principles & Variables Affecting Froth Flotation
pH Modifiers AKA Minor Agents. The role of the minor agents (pH Modifiers) is to increase the grade of concentrate, i.e., aid in selection, and to a lesser extent, aid recovery. Various theories have been advanced to explain …
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Froth Flotation of Chalcopyrite/Pyrite Ore: A …
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 the presence of ions that simulate the use of seawater or process water, and …
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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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Separation efficiency improvement of a low grade …
chalcocite, bornite and others. The recovery of gold-containing pyrite to the ... Mineralogical diagnosis of feed and product streams from the copper flotation circuit have shown that the copper bearing minerals are well liberated and thus further liberation of the copper minerals was not selected as a method
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The effect of clay minerals on the process of flotation of copper ores
Processing of high clay ores is usually related to negative effects in particular in the flotation stages. A good description was made recently in the work by Chen and Peng (2018), who developed a general review about the mechanisms and behaviour of clays in mineral flotation.The background they presented is general and useful for any situation in which clays appear since …
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Dixanthogen
The active surface entities for chalcocite and bornite are metal xanthates, dixanthogen for pyrite, metal xanthate for initial flotation of chalcopyrite and dixanthogen for full flotation. ... But the overdose of potential modifier decreased the flotation recovery, which was attributed to the aggressive oxidation of mineral surface forming ...
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DEXTRINS AS SELECTIVE FLOTATION DEPRESSANTS FOR …
Dextrins from starches thermally modified under ammonia were found to be promising selective depressants in the studies with model (1:1) mixtures of galena and chalcocite but poor …
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Dextrin as a non-toxic depressant for pyrite in flotation with
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 for ...
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Modifiers For Chalcocite Flotation
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 ...
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The effect of various reagents on selective flotation of …
The flotation results show that sodium metabisulfite separated the molybdenite and chalcocite by depressing chalcocite flotation. In addition, the separation efficiency is higher if sodium metabisulfite was used for separating chalcocite and molybdenite that have been treated with thionocarbamate. REFERENCES. 1. A. Ansari
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Flotation Modifiers – Activators – Depressants
It may be found in association with other copper bearing minerals like Bornite and Chalcocite or non-copper bearing minerals like Galena, Zinc, Silver and Gold. To start with, …
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k. hanumantha rao
professor of minerals engineering, Norwegian University of Science and Technology - Cited by 4,834 - mineral processing - minerals bioprocessing - surface chemistry - flotation - molecular modelling
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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 the test, and the flotation …
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pH Ranges for Sequential Cu Pb Zn Flotation | Separation
To understand froth flotation, first read that article and come back to read about sequential flotation of Copper, Lead and Zinc. 911 Metallurgist is a trusted resource for practical insights, solutions, and support in mineral processing engineering, helping industry professionals succeed with proven expertise. | pH Ranges for Sequential Cu Pb ...
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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 the flotation ...
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The Life Cycle of Water Used in Flotation: a Review
In addition, the anions and cations with greater atomic size were found to have a positive effect on chalcocite flotation as these ions tended to modify the hydrophobicity of the chalcopyrite surface. The successful application of saline water in reducing clay coatings on the chalcocite can be investigated further for other mineral separations ...
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Basic Principles & Variables Affecting Froth Flotation
Some sulphides, also, require a less quantity of oil to separate them from a given gangue than do others. Thus galena can be separated from a given ore with less oil than can blend, and chalcocite is separated with the use of a less quantity of oil than pyrite. Some methods of differential flotation are founded on this phenomenon. Pulp-Body
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Influence of Organic and Inorganic Modifiers on the Selective Flotation
flotation separation Flotation tests modifiers were in of a also studied． 2．]E】xpermental The mines and Department Sapporo, minerals calcite of 060, used from IVIineral Japan． were high grade the・Todoroki Resources Materias hand−picked miRes． Development The ad〔et｝ods specimens 43−104 Engineering ...
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The Formulation and Use of Mixed Collectors in Sulphide Flotation …
The resource contains hypogene and supergene geomet units with a transitional zone located inbetween the (upper) supergene and the (lower) hypogene. In the hypogene unit, the major copper sulphides are bornite, chalcopyrite and chalcocite, whilst in the supergene, the sequence is led by chalcocite, then bornite, and finally chalcopyrite .
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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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Differential flotation of a chalcocite-pyrite particle bed by
External control of the electrochemical potential of a bed of mineral particles was investigated by the US Bureau of Mines as a method for controlling particle interaction with organic collectors and, thus, flotation response. A cylindrically shaped, 200- to 300-g bed of sulfide mineral particles was used as the working electrode in an electrochemical-flotation cell. In a pH 9.2 sodium ...
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Effect of hydrogen peroxide on selective flotation of chalcocite …
After reviewing the previous studies, this study focused on the effect of oxidation treatment using H 2 O 2 on the floatability of chalcocite and enargite in the absence and presence of KAX at pH 9. Furthermore, this study investigated the H 2 O 2 treatment in the selective flotation of chalcocite and enargite. In addition, adsorption and surface characterization using …
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A Review of the Flotation of Copper Minerals
Figure 1 shows the principle of froth flotation. Figure 1: Principle of flotation [3]. Froth flotation can be regarded as a system [3], with various sub-processes and interactions. For flotation to take place an air bubble must be able to attach …
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CHAPTER 7 FLOTATION OF SULPHIDE MINERALS
Complete flotation of chalcopyrite is possible from pH 3 to pH 12 with ethyl xanthate. Both electrochemical oxidation of xanthate to dixanthogen as well as chemisorption of xanthate on chalcopyrite are responsible for flotation when xanthate is added as collector.
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