The effect of slime coatings of the serpentine minerals, chrysotile and lizardite, on pentlandite flotation

Edwards, C. R. W.; Kipkie, W.B.; Agar, G.E.

doi:10.1016/0301-7516(80)90035-6

Cited by 142 publications

(53 citation statements)

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“…For the presence of chelating group, the addition of sodium pyrophosphate may promote the formation of metal ion-pyrophosphate, preventing its reaction with collector [20]. It was demonstrated that sodium pyrophosphate could reduce the adverse effect of serpentine on the flotation of pentlandite by shifting the slime surface charge [21]. In addition, sodium pyrophosphate has also been used in scheelite flotation [22,23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

Chen,

Feng,

Zhang

et al. 2018

Minerals

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In this study, the effect of sodium pyrophosphate (NaPP) on the separation of apatite from dolomite by flotation was systematically investigated. Flotation results revealed that NaPP could selectively depress the flotation of apatite, thus realizing the separation of apatite from dolomite. Further, the selective depression mechanism of NaPP was studied through zeta potential measurements, contact angle measurements, and X-ray photoelectron spectroscopy (XPS) analysis. The results demonstrated that the adsorption of sodium oleate (NaOL) onto apatite surface was depressed by the preferential interaction of NaPP with active Ca sites. For dolomite, while the presence of NaPP hindered the interaction of NaOL with active Ca sites, it appeared to enhance the reactivity with active Mg sites. Thus, the adsorption of NaOL onto dolomite surface was hardly influenced. In this way, the separation of apatite from dolomite was achieved.

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Section: Introductionmentioning

confidence: 99%

Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

Chen,

Feng,

Zhang

et al. 2018

Minerals

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“…Economic beneficiation of the Ni ores containing large amounts of serpentines (Mg silicates) has been a longstanding challenging problem in the mineral industry (Claridge and Tenbergen, 1975;Edwards et. al., 1980;Eltham, J.…”

Section: Introductionmentioning

confidence: 99%

Transport of fibrous gangue mineral networks to froth by bubbles in flotation separation

Patra¹,

Bhambhani²,

Vasudevan³

et al. 2012

International Journal of Mineral Processing

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Flotation beneficiation of ores containing fibrous minerals is highly problematic due to transport of such gangue minerals from pulp to the froth phase. Earlier studies have attributed such transport to the entrainment of fibrous minerals. In this work, this problem is investigated for the case of flotation of ultramafic Ni ore with fibrous serpentines (Mg silicates) interfering with their separation. Serpentines are proposed to form large (~1-2 cm) networks in pulp and thus unlikely to be transported by entrainment. Various simulation based studies suggest that the networks are stable under the dynamic flotation conditions. Furthermore, the pores in the networks are relatively small (e.g. < 20 microns -SEM studies) for the bubbles (1-2 mm) to penetrate through the network of fibers in the pulp. This leads to the hypothesis that bubbles which cannot penetrate through the network accumulate below the network in the pulp with the buoyancy force of the bubbles thrusting the network to the froth phase. Model system studies were carried out with nylon fibers of size similar to that of serpentines. The phenomenon, of bubble-flux driven A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT transport of fibrous serpentines was clear from the model system studies, and is proposed to be the key mechanism of transport of fibrous serpentines to flotation concentrate.

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“…Fig 2.3 shows that in neutral and weakly alkaline solutions, pentlandite is negatively charged, but serpentine is positively charged, resulting in electrostatic interaction between them. The coating of serpentine minerals on pentlandite surfaces explains the poor flotation behaviour of pentlandite as shown in Fig 2.4 (Edwards, G.R., 1980;Bremmell, K.E., 2005). Hydrophilic silicate slime coatings on valuable sulphide minerals reduce surface wettability and thus decrease both the flotation rate and recovery of sulphide minerals.…”

Section: Slime Coatings On Valuable Minerals In Flotationmentioning

confidence: 99%

“…This is agreed with the measurement in other literatures (Arnold and Aplan, 1986;Vane and Zang, 1997 The electrostatic attraction between gangue and valuable minerals has been reported to attribute to slime coatings. It has been well documented that clay slime coatings occur on galena, coal and bitumen surfaces through the electrostatic attraction, reduce surface hydrophobicity and then depress the flotation significantly (Arnold and Aplan, 1986b;Edwards et al, 1980).…”

Section: Slime Coatings On Valuable Minerals In Flotationmentioning

confidence: 99%

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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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The effect of slime coatings of the serpentine minerals, chrysotile and lizardite, on pentlandite flotation

Cited by 142 publications

References 1 publication

Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

Transport of fibrous gangue mineral networks to froth by bubbles in flotation separation

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

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