The effect of surface potential on the flotation of chromite

Sysilä, S.; Laapas, H.; Heiskanen, Kari; Ruokonen, Eeva

doi:10.1016/0892-6875(96)00040-4

Cited by 13 publications

(6 citation statements)

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“…The electrokinetic properties of chlorite minerals have been reported in a number of studies (Alvarez-Silva et al, 2010;Edwards et al, 1980;Hussain et al, 1996;Sondi and Pravdic, 1998;Sondi and Velimir, 1996;Sondi et al, , 1997Sysila et al, 1996). Values of pH pzc reported in these studies vary in the range of 3,pH pzc ,6 dependent upon the particular chlorite mineral species, the prevailing solution conditions and the method of mineral preparation.…”

Section: Chlorite Crystal Structure and Surface Charging Mechanismsmentioning

confidence: 92%

Surface and chemical properties of chlorite in relation to its flotation and depression

Silvester

Bruckard

Woodcock

2011

Mineral Processing and Extractive Metallurgy

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The chlorite group of minerals exhibit a wide range of surface charging properties in aqueous suspensions. A systematic review of the literature as it relates to the flotation, depression and surface properties of chlorite and related minerals was undertaken, with a view to using this information to help develop suitable reagent schemes which might allow the selective removal of chlorite from sulphide and oxide flotation systems. The surface charge on chlorite mineral particles originates from permanent charges on basal planes of the crystallites and pH dependent (amphoteric) charge on crystallite edges, typical of clay minerals. The net charge on chlorite particles depends upon the edge/face plane ratio (crystallite size), the solution pH and the presence of specifically adsorbing ions (principally Ca 2z ). Both cationic and anionic surfactants (collectors) are observed to adsorb on chlorite particles, over a wide range of pH conditions. This apparently contradictory behaviour is most likely due to the dual modes of surface charging and the effects of cation substitution into the chlorite lattice. In the case of anionic collectors, some specific (chemical) adsorption energy may also contribute to the adsorption properties. Chlorite depressants used in oxide and sulphide flotation are typical of those used for other silicate minerals. The most common of these depressants are sodium silicate (Na 2 SiO 3 ), carboxymethylcellulose and fluoro compounds (hydrogen fluoride and sodium hexafluorosilicate). There have been no studies of the effects of the chlorite surface charging properties upon depressant selection, although it appears likely that the edge/face plane ratio will strongly influence the depressant adsorption behaviour.

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Section: Chlorite Crystal Structure and Surface Charging Mechanismsmentioning

confidence: 92%

Surface and chemical properties of chlorite in relation to its flotation and depression

Silvester

Bruckard

Woodcock

2011

Mineral Processing and Extractive Metallurgy

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“…However, if one considers the changes on zeta potential of each mineral, it is clear that while both minerals acquired close values in the concentration range of 1x10 -7 mol/dm 3 to 1x10 -4 mol/dm 3 , serpentine became more negative at concentrations higher than 1x10 -4 mol/dm 3 which can be probably explained by the chemisorption of oleate on mineral surfaces that may become stronger for serpentine at higher collector concentrations (Sysila et al, 1996;Gallios et al, 2007).…”

Section: Zeta Potential Measurementsmentioning

confidence: 99%

“…Many papers can be found on fundamentals of chromite and serpentine flotation including the effects of different reagents (Palmer et al, 1975;Sysila et al, 1996;Guney et al, 1999), modifiers and other relevant conditions (Gallios et al, 2007). However, there is no study directed towards the contribution of particle shape on the flotation separation of these minerals.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle shape properties on selective separation of chromite from serpentine by flotation

Güven¹,

Serdengeçti²,

Tunç³

et al. 2020

Physicochem. Probl. Miner. Process.

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Although many studies have been conducted on the morphological variations and its effects on flotation recoveries of a single mineral system, a systematic study for the flotation behavior of mixtures of minerals has not dwelled much. In this study, th flotation behavior of chromite and serpentine minerals was investigated to distinguish and isolate the contribution of morphology in single and binary systems. For this purpose, the shape analyses for the minerals ground as single and mixture were performed, and their flotation behaviors determined with the micro-flotation experiments. Additionally, the zeta potential measurements were carried out in the presence of sodium oleate as a collector. The shape analysis of the ground samples showed that while the roundness values of chromite and serpentine (gangue) minerals as single were quite different, the particle shape of chromite favored serpentine in the mixture system which in turn suggested that the mineral with the high hardness value dominates the shape characteristics in binary grinding conditions. Accordingly, while the flotation characteristics of chromite in the mixture followed the same trend with the flotation of a single chromite system as a function of particle shape, almost a reverse trend was obtained for the shape and flotation of serpentine in the mixture compared to a single serpentine system. Thus, at roundness values of chromite particles from 0.797 to 0.732, the flotation recoveries of chromite in the mixture increased from 51.0% to 75.4%. On the other hand, likewise chromite, the flotation recoveries of serpentine increased from 20.0% to 37.3% proportional to the roundness range of 0.757 and 0.709. These findings in turn showed that the grinding conditions dictate the soft component to be monitored by the harder and denser component which dominates the angularity and floatability of the mixture.

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“…Most of the studies have been devoted to finding out the underlying mechanisms to beneficiate these kinds of ores [1][2][3][4][5][6]. Although the possible enrichment conditions of single mineral systems are reported in many studies, there are still many points to investigate for mixed systems with close similarities in their physical and chemical properties [7][8][9][10]. Thus, according to its silicate content and similar properties to quartz, Swarna et al [1], investigated the solubility of wollastonite and its Hallimond flotation behavior as a function of dodecyl amine concentration and pH value.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Characterization of Natural Wollastonite and Calcite

2020

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Wollastonite and calcite minerals are significant raw materials and are extensively used due to their unique properties. Wollastonite is used in plastics, paint, ceramics, paper, resins, and in construction as a substitution for asbestos due to its chemical stability, thermal resistivity, needle-like shape, and brightness. Calcite is one of the most used raw materials because of its low hardness, high alkalinity, sorptive properties, white and bright color. Wollastonite and calcite are two minerals found together in nature. The most common method used for separating these two minerals is flotation. In this study, the surface properties of pure mineral samples were investigated. The pH profiles of both minerals were obtained by measuring the surface charge of particles followed by the measurement of the zeta potential in different collector concentrations. The wettability of minerals was examined by measuring their contact angles.

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The effect of surface potential on the flotation of chromite

Cited by 13 publications

References 0 publications

Surface and chemical properties of chlorite in relation to its flotation and depression

Surface and chemical properties of chlorite in relation to its flotation and depression

Effect of particle shape properties on selective separation of chromite from serpentine by flotation

Physicochemical Characterization of Natural Wollastonite and Calcite

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