Pulp Potential and Its Implications to Sulfide Flotation

Cheng, Xuan; Iwasaki, I.

doi:10.1080/08827509208914206

Cited by 45 publications

(27 citation statements)

References 22 publications

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“…However, the Eh measurement not only depends on dissolved oxygen but also on the ions present (e.g. Fe 2+ , Cu 2+ ) and impinging mineral particles present in the slurry (Cheng and Iwasaki 1992). In addition, the copper sulphide minerals were recovered into the concentrates, leading to a gradual decrease of their percentage from cell 1 to cell 5.…”

Section: Pulp Chemistry At Telfer Plantmentioning

confidence: 99%

“…EDTA extraction also indicated that the amount of EDTA extractable iron decreased from 85.14 mg/g solid (Table 4.2) to 57.40 mg/g solid (Table 4.4) after the addition of 300 g/t CuSO4·5H2O during regrinding with mild steel. As discussed, the Cu-activated pyrite behaves like copper sulphide products (Leppinen 1990, Voigt et al 1994, and the copper sulphide minerals are more electrochemically active than pyrite (Cheng and Iwasaki 1992). The galvanic interaction between mild steel media and the Cu-activated pyrite is weaker than that between mild steel media and pyrite resulting in less oxidation of the media and generation of less iron oxidation products.…”

Section: Pyrite Flotation With Additional Cu 2+ Added During Regrindingmentioning

confidence: 99%

“…It is not distinguishable whether the oxidation occurred on the carried Cu-activated pyrite surface or new created pyrite surface. It is known that the Cu-activated pyrite behaves like copper sulphide products (Leppinen 1990, Voigt et al 1994, and the copper sulphide minerals are more electrochemically active than pyrite (Cheng and Iwasaki 1992). It is therefore anticipated that the carried Cu-activated pyrite surface which necessitates the pyrite flotation was more oxidized during regrinding resulting in the further depression of pyrite flotation in the cleaner stage.…”

Section: Pyrite Flotation After Regrinding With Different Grinding Mediamentioning

confidence: 99%

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The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

Chen¹

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Regrinding rougher flotation concentrates is typically used to liberate valuable minerals from gangue prior to the cleaner separation stage in processing of low grade ores. Compared to the rougher flotation after primary grinding, it is usually more challenging to achieve a satisfactory performance in post-regrind cleaner flotation especially when fine particles are generated. One main factor which results in this reduction in flotation is the unsuitable particle surfaces produced after regrinding. However, this factor is not usually considered when designing and optimizing the regrinding process.Extensive studies have demonstrated that grinding chemistry can influence mineral floatability.However, earlier studies focused on primary grinding and rougher flotation rather than regrinding and cleaner flotation. In addition, different types of regrind mills are used in industry, and these provide different particle breakage mechanisms which may also influence mineral floatability.Therefore, the overall objective of this thesis study is to investigate the effects of regrinding chemistry and particle breakage mechanisms on the cleaner flotation. The implementation of regrinding in the copper and pyrite flotation circuits at Telfer gold mine was taken as a case study and four research areas were addressed with the objective of developing fundamental understanding to provide practical guidance for the plant operation. The four areas investigated are:1. Effect of regrinding chemistry on copper activation of pyrite and its flotation; 2. Separation of different copper sulphide minerals from pyrite after regrinding; 3. Importance of pulp chemistry during regrinding rougher concentrates; 4. Effect of particle breakage mechanisms on subsequent flotation.In this study, it was found that copper activation of pyrite and its flotation in the cleaner stage were affected by regrinding. In general, a decrease in surface concentration of collectors due to the increased surface area after regrinding contributed to the low pyrite recovery in the cleaner. Surface analysis revealed that both the surfaces that were carried from the rougher flotation concentrate and those which were freshly created were modified by the strong electrochemical reactions occurring inside the regrind mill. Stainless steel media promoted pyrite oxidation, especially on the copper activated surfaces. Mild steel media produced a greater amount of iron oxidation species which could adsorb on the carried surfaces. It was also found that mild steel media generated a reducing condition which favoured the copper activation on the freshly created surfaces.ii The research has also shown that the separability of chalcopyrite and chalcocite from pyrite was significantly different after regrinding, which was related to their electrochemical properties.Chalcocite was more active and therefore presented a stronger galvanic interaction with pyrite.Consequently chalcocite was more oxidised, which not only depressed its flotation but also produced sufficient copper ions...

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Section: Pulp Chemistry At Telfer Plantmentioning

confidence: 99%

Section: Pyrite Flotation With Additional Cu 2+ Added During Regrindingmentioning

confidence: 99%

Section: Pyrite Flotation After Regrinding With Different Grinding Mediamentioning

confidence: 99%

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The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

Chen¹

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“…However, when two (or more) oxidation/reduction couples are present in the system, particularly flotation system, the redox conditions in the system is not characterised by a unique potential value from the Nernst equation, but from a potential called "mixed potential". It means that the mineral particles accept a particular potential value, which is in between of the reversible reactions (Cheng and Iwasaki, 1992, Rao et al, 1992, Chander, 2003, Woods, 2003, Woods, 2010.…”

Section: Mixed Potential Theorymentioning

confidence: 99%

“…Direct control of the potential means the application of an external energy source on the mineral slurry. Redox reagents method uses the chemical reagents to adjust the pulp potential either through the activity of oxygen in the pulp (by changing the oxygen content of the flotation gas) or by adding suitable oxidising agents and reducing agents (Cheng and Iwasaki, 1992, Rao et al, 1992, Kant, 1997.…”

Section: Electrochemical Review Of Sulphide Minerals In the Flotationmentioning

confidence: 99%

Selective flotation of enargite from copper sulphides in complex ore systems

Tayebi-Khorami¹

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Recent research has demonstrated promising results showing the possibility of separating arseniccopper sulphides from other copper minerals by controlling the potential of the flotation pulp. Most of these studies were conducted on single mineral systems, and the selective removal of arseniccopper minerals in real ore systems is not well understood. In real ore systems, the efficiency of the separation strongly depends on the mineralogical characteristics of the ore samples. This study seeks to understand the effect of ore mineralogy on the floatability of enargite in a complex ore system, under a controlled potential flotation environment.A composite of several high arsenic-containing drill core intersections for the high arsenic sample (HAS) and a composite of some low arsenic-containing drill core intersections for the low arsenic sample (LAS) were selected from the Tampakan copper-gold deposit in the Philippines, providing a range of arsenic levels. Arsenic in the HAS sample (enargite) was practically twice that for the LAS sample. The non-enargite copper minerals (NECu) were mostly chalcopyrite and bornite in both samples.Comprehensive size-by-size, chemical and mineralogical analyses were performed on both ore samples. It was observed that the two ore samples had similar mineralogical characteristics in terms of mineral content and liberation distribution, however there are some differences in the proportions of minerals. It was also observed that NECu minerals were mostly distributed to the coarser size fractions, while the proportion of enargite in the finer size fractions was higher than for NECu. The mineral grain size data showed that enargite had the finest grain size distribution compared to other copper minerals.The selective separation of enargite from NECu minerals in a rougher flotation system under controlled pulp potential was investigated for both samples. It was observed that it is possible to selectively separate enargite from other copper minerals after reducing the pulp potential to about -200 mV SHE at pH 11 in the LAS sample. However, no separation between enargite and NECu minerals was observed at a reducing potential for the HAS sample, and enargite did not float very well for this sample as the Eh was changed.The Particle Kinetic Model was used to predict the flotation response of enargite and NECu in the HAS sample based on mineral flotation rates derived from the LAS sample and the mineralogy of the HAS sample. It was observed that the predicted values of enargite recoveries were higher in the HAS sample when compared with the results of actual flotation tests. As the mineralogy of the two ore samples was similar in terms of mineralogical and liberation characteristics, the only reason for the iii poor prediction of the model for the HAS sample was due to the change in the flotation pulp conditions for the HAS sample. There were two possible reasons for this change in the flotation response of the HAS sample. One was the higher levels of pyrite present in the HAS sample com...

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A review of the physicochemical properties and flotation of pyrrhotite superstructures (4C – Fe₇S₈/ 5C – Fe₉S₁₀) in Ni‐Cu sulphide mineral processing

Multani

Waters

2018

Can J Chem Eng

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Pyrrhotite is one of the most abundant sulphide gangue minerals in base metal mining operations. It has little economic value and is a significant contributor of SO2 emissions at the smelting stage, thus it is rejected in most concentrators, requiring a concerted effort to ensure it is well separated from valuable minerals. The mineral processing of pyrrhotite is generally understood, however it has many complex crystallographic structures (superstructures) that behave differently in the flotation pulp for which the information is sparse and dispersed throughout the literature. Traditionally, the superstructures were largely isolated into magnetic/non–magnetic circuits and floated separately. Many operations have now transitioned away from magnetic separators, and treat the superstructures in the same flotation circuit where their flotation responses are quite different. Historically, it was perceived that the superstructures behaved virtually the same; whereas, recent work has clearly demonstrated that there are quantifiable differences in their flotation responses. The available information is scattered in the literature and is also plagued with many contradictions, making it very difficult for researchers to retrieve relevant information pertaining to the superstructures. This review aims to reduce the confusion by summarizing the superstructure nomenclature, characterization methods, aqueous stability, surface charges and superstructure‐reagent interactions, and available flotation data.

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Pulp Potential and Its Implications to Sulfide Flotation

Cited by 45 publications

References 22 publications

The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

Selective flotation of enargite from copper sulphides in complex ore systems

A review of the physicochemical properties and flotation of pyrrhotite superstructures (4C – Fe₇S₈/ 5C – Fe₉S₁₀) in Ni‐Cu sulphide mineral processing

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Pulp Potential and Its Implications to Sulfide Flotation

Cited by 45 publications

References 22 publications

The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

Selective flotation of enargite from copper sulphides in complex ore systems

A review of the physicochemical properties and flotation of pyrrhotite superstructures (4C – Fe7S8/ 5C – Fe9S10) in Ni‐Cu sulphide mineral processing

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A review of the physicochemical properties and flotation of pyrrhotite superstructures (4C – Fe₇S₈/ 5C – Fe₉S₁₀) in Ni‐Cu sulphide mineral processing