Correlation between the surface composition and collectorless flotation of chalcopyrite

Zachwieja, J.B.; McCarron, J.J.; Walker, G. W.; Buckley, Alan N.

doi:10.1016/0021-9797(89)90260-9

Cited by 64 publications

(24 citation statements)

References 10 publications

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“…The observed increase in copper recovery was likely due to the recovery of secondary copper minerals such as chalcocite and bornite which do not readily show collectorless flotation behaviour [20,21] but are higher in copper content than chalcopyrite which can float readily in the absence of collector [14,22]. Collector addition was included in further flotation tests as part of regrind-flotation pre-treatment stage due to the observed increase in gold and copper recoveries and continued pyrite depression.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

The development of regrind–flotation pre-treatment of the CIL feed in copper–gold plants

et al. 2014

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This study focused on the development of a new method, regrind-flotation pre-treatment, to improve the performance of the CIL (Carbon-in-Leach) circuit at copper-gold concentrators. Occlusion of gold by iron sulphide gangue minerals and the fine grain size of gold associated with them contribute to the low gold recovery in the CIL circuit. Fine grinding of the CIL feed increased gold recovery significantly from the leaching process. However, fine grinding increased the amount of liberated copper which is cyanide soluble resulting in significantly higher cyanide consumption. A proposed method of regrinding of the CIL feed followed by copper flotation was developed as an appropriate pre-treatment method for the CIL circuit that increased gold recovery while reducing cyanide consumption related to the presence of copper.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

The development of regrind–flotation pre-treatment of the CIL feed in copper–gold plants

et al. 2014

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“…CuFeS 2 → CuFe 1-x S 2 + xFe 2+ + 2xe - Zachwieja et al (1989) studied the oxidation of chalcopyrite agreed with Buckley and Woods (1984) and confirmed that the oxidation of chalcopyrite resulted in the release of iron ions from chalcopyrite. They also found that the floatability of the conditioned mineral was consistent with the hydrophobic sulphur-rich sulphide lattice.…”

Section: The Oxidation On Copper Sulphide Mineralsmentioning

confidence: 55%

Slime coating mitigation on mineral surfaces in froth flotation by saline water

Zhao¹

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Fine and ultra-fine particle flotation is central to the mining industry as a result of the need to treat low grade and difficult ores which require fine grinding to liberate valuable minerals from gangue minerals. However, the flotation of fine and ultra-fine particles is not efficient and a slime coating with slime gangue particles attaching to valuable minerals is one of the most popular barriers. A slime coating prevents the adsorption of collectors on the surface of valuable minerals resulting in low flotation recovery or low product quality.Saline water is also an important issue in the mining industry. In Western Australia, bore water with a high ionic strength has to be used at mine sites for production, site rehabilitation, and downstream processing because fresh water is not available locally. In Queensland, most mine sites have adopted water re-use as a means for making freshwater savings. However, water re-use results in increased salinity in site water stores, which is driven largely by evaporation and ongoing salt inputs from spoil, minerals and groundwater. Flotation relies on a large amount of water and therefore the impact of saline water on flotation performance has gained more and more attention.In this research, the role of saline water in the mitigation of slime coatings was studied and a generic approach to improve fine and ultra-fine particle flotation by using saline water was developed, building on the previous research. A model slime coating system was established by using copper minerals in the presence of clay particles. It was found that chalcocite flotation was depressed in the presence of bentonite slimes while chalcopyrite flotation was less affected.Electrostatic interactions between copper minerals and clay particles were found to be responsible for the different flotation of chalcocite and chalcopyrite in the presence of clay minerals. It was found that surface oxidation occurred during II grinding and changed the surface properties of chalcopyrite and chalcocite.Chalcocite was strongly oxidized while chalcopyrite was slightly oxidized after the grinding with stainless steel media. The different extent of surface oxidation resulted in the different electrical property of chalcocite and chalcopyrite surfaces.The strongly oxidized chalcocite surface became positively charged after grinding at the same pH and electrostatically attractive to bentonite particles resulting in the depressed chalcocite flotation. In contrast, the slightly oxidized chalcopyrite surface remained negatively charged after grinding at pH 9.0 and entropically repulsive from bentonite slime particles. Therefore, bentonite slimes did not influence chalcopyrite flotation as much as chalcocite flotation.Mitigation of slime coatings on chalcocite in flotation by using electrolytes was further investigated and kaolinite was used to introduce the slime. The results indicated that in tap water, the presence of kaolinite slimes depressed chalcocite flotation. With the addition of electrolytes to the flotation...

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“…An analogous reaction in acidic solution was proposed as: Zachwieja et al (1989) confirmed that the oxidation of chalcopyrite resulted in the release of iron ions from chalcopyrite. They found that the oxidation rate increased with pH, because increasing pH resulted in an increase in the ease in which iron ions were removed from the chalcopyrite surface by the formation of iron-hydroxyl species.…”

Section: Chalcopyrite Oxidation and Flotationmentioning

confidence: 85%

“…The metal-deficient sulphide formed on chalcopyrite electrodes in acid electrolyte solutions was confirmed by Biegler and Horne (1985) with a surface layer composed of CuS and S 0 . Zachwieja et al (1989) also correlated the selfinduced flotation response of air-exposed chalcopyrite in alkaline solutions with the surface composition and found that the floatability of the conditioned mineral was consistent with the hydrophobic sulphur-rich sulphide lattice.…”

Section: Chalcopyrite Oxidation and Flotationmentioning

confidence: 87%

“…The metal-deficient sulphide and polysulphide from mild oxidation of chalcopyrite surfaces are hydrophobic, and contribute to the collectorless flotation of chalcopyrite (Gardner and Woods 1979, Buckley and Woods 1984, Zachwieja et al 1989). EDTA extraction was conducted after primary grinding and regrinding of chalcopyrite to study the surface oxidation of chalcopyrite by measuring copper and iron ion production.…”

Section: Flotation Of Chalcopyritementioning

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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Correlation between the surface composition and collectorless flotation of chalcopyrite

Cited by 64 publications

References 10 publications

The development of regrind–flotation pre-treatment of the CIL feed in copper–gold plants

The development of regrind–flotation pre-treatment of the CIL feed in copper–gold plants

Slime coating mitigation on mineral surfaces in froth flotation by saline water

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

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