The influence of particle shape properties and associated surface chemistry on the flotation kinetics of chalcopyrite

Vizcarra, T.G.; Harmer, Sarah L.; Wightman, Elaine M.; Johnson, N. W.; Manlapig, E.

doi:10.1016/j.mineng.2011.02.019

Cited by 63 publications

(24 citation statements)

References 19 publications

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“…In other words, SHMP reduced the formation and adsorption of Mg(OH) 2 on chalcopyrite, thereby improving chalcopyrite recovery. Figure 10 shows five S species including monosulfide (S 2− ), disulfide (S 2 2− ), polysulfide (S n 2− ), sulfate (SO 4 2− ) and an energy loss feature (S 3p → Fe 3d) located at 161.3 eV, 162.0 eV, 162.8 eV, 169.1eV and 164.9 eV, respectively [38,[46][47][48][49].…”

Section: Survey Spectramentioning

confidence: 99%

The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

Xiao

et al. 2018

Minerals

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Sea water has been used in flotation plants, showing a promising way to save fresh water usage. Previous studies indicated that divalent salts in sea water played negative roles in chalcopyrite flotation, but not much work have been conducted to understand the eliminating mechanisms. This study systematically investigated the effects of divalent cations of Ca 2+ and Mg 2+ on natural flotability of chalcopyrite in the absence of collectors and frothers. The reduced recovery was mainly due to the adsorption of Mg and Ca hydroxyl complexes and precipitation on chalcopyrite surfaces, giving rise to a less hydrophobic surface. The addition of sodium hexametaphosphate (SHMP), however, significantly improved chalcopyrite recovery. Species calculation, contact angle, zeta potential, FTIR and XPS analyses were conducted to understand the influencing mechanisms of divalent ions and the beneficial effects of SHMP on chalcopyrite recovery. The primary mechanism was that SHMP prevented the adsorption of positively charged Mg and Ca compounds or precipitation with hydrophilic properties such as Mg(OH) 2 on chalcopyrite surfaces, confirmed by the Derjguin-Landau-Verwey-Overbeek (DLVO) theory. Secondly, SHMP reacted with Mg 2+ and Ca 2+ to form dissolvable complexes, thereby declining the formation of insoluble Mg 2+ and Ca 2+ compounds or precipitation.

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Section: Survey Spectramentioning

confidence: 99%

The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

Xiao

et al. 2018

Minerals

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“…Different particle shape may be produced after regrinding in rod and stirred mills. However, as reported by Vizcarra et al (2011), particle shape only influences the flotation of minerals with slow flotation kinetics (e.g., with no collector addition, for gangue minerals). Therefore, this factor was not considered in this study.…”

Section: Resultsmentioning

confidence: 74%

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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“…What was however concluded from this is what is potentially the most important aspect that relates to composite particle flotation, and that is that the grain edges of composite particles may act as a means of pinning the three-phase contact line to provide greater particle-bubble aggregate stability. The outcomes of the work by Vizcarra, et al (2011) may also be seen as indicating that shape features may be more important for composite particles of low hydrophobicity where attachment efficiency to bubbles is low due to low liberation of the hydrophobic minerals.…”

Section: Mineral and Particle Textures Based On 2d Particle Sectionalmentioning

confidence: 99%

“…Vizcarra, et al (2011) studied the role of particle angularity (as defined by Pourghahramani & Forssberg (2005)) on the rate of flotation of pure chalcopyrite in a micro-flotation cell with and without collector addition. In the latter case angularity did play a strong role for particles of low hydrophobicity but when collector was introduced no clear difference was observed in the flotation behaviour between particles of low or high angularity.…”

Section: Mineral and Particle Textures Based On 2d Particle Sectionalmentioning

confidence: 99%

“…Fundamental insights of how this characteristic affects the sub-processes should form a key component in providing more robust propertybased models for the forecasting of flotation performance. The work by Vizcarra, et al ( 2011) for example may be seen as indicating that sharp features may be more important for composite particles of low hydrophobicity where attachment efficiency to bubbles is low due to low liberation of the hydrophobic minerals and this should be considered in future work when examining the impact of particle composition and grain textures.…”

Section: Introductionmentioning

confidence: 99%

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The effect of mineral grain textures at particle surfaces on flotation response

Vos¹

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This research investigates the contribution of the spatial arrangement of hydrophobic mineral grains at particles surface towards their flotation response and its implications for forecasting flotation response. The approach taken was to estimate this grain textural characteristic from particle sections and to identify how it affected the overall rougher and scavenger copper mineral flotation recovery from two industrial copper flotation circuits.For the second circuit the overall rougher flotation kinetic parameters for the copper mineral were also evaluated.The first contribution of this work is the demonstration that a novel textural indicator is relevant to understanding the contribution of exposed mineral grain texture on the flotation process. It is the first mineral grain textural indicator that considers both the size of the grains and the degree to which they are dispersed at the particle surface. When the indicator was applied to particle sections from flotation feed, concentrate and tail samples from two industrial copper flotation circuits, it was shown, for the first time, with confidence that while particle size and perimeter composition affect particle flotation response the spatial arrangement of the copper mineral grains at the particle surface plays a key role.For the iron-oxide-copper-gold ore, copper mineral grains in complex texture classes produced statistically higher overall rougher recoveries for the 0-20% perimeter composition class. Chalcopyrite grains in complex texture classes in the copper porphyry ore produced higher overall rougher and scavenger recoveries for the 20-40% perimeter composition class. For the 0-20% perimeter composition class statistically meaningful differences were observed for the +106 m size class. It was shown that the higher overall recoveries for the complex texture classes in this case were due to increases in the overall rougher rate of flotation, the proportions of recoverable chalcopyrite in the feed or both. For both ores the largest proportions of copper mineral within complex perimeter texture classes were within coarse particles and complex textures were less common when particle perimeters comprised more than 40% of the copper minerals. This demonstrated that in order to study the impact of this textural characteristic for the two ores it must be done within well-defined particle size and perimeter composition classes, an important outcome that has not been reported in the current literature.The second contribution is a three-step method for evaluating the flotation response of copper minerals within different grain texture classes namely; particle perimeter texture II estimation, determining coefficients of variation in the mass proportions of the target mineral within perimeter texture-composition classes and mass reconciliation and recovery calculations. Another key contribution is in applying the bootstrap resampling technique to estimate these coefficients. This demonstrated the sensitivity of seemingly feasible perimeter texture-compos...

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The influence of particle shape properties and associated surface chemistry on the flotation kinetics of chalcopyrite

Cited by 63 publications

References 19 publications

The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

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

The effect of mineral grain textures at particle surfaces on flotation response

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