The role of cations in copper flotation in the presence of bentonite

Wang, Yanhong; Peng, Yongjun; Nicholson, Timothy M.; Lauten, Rolf Andreas

doi:10.1016/j.mineng.2016.06.012

Cited by 24 publications

(15 citation statements)

References 31 publications

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“…) has been found to be effective in reducing the high pulp viscosity of high-clay-content suspensions (Heller and Keren 2001;Lagaly and Ziesmer 2003;Suzuki et al 2005). The effects of these ions on pulp rheology in flotation and on flotation performance have been reviewed previously (Cruz et al 2013(Cruz et al , 2015a(Cruz et al , 2015b(Cruz et al , 2015cZhang et al 2015b;Wang et al 2016). These studies have confirmed that pulp viscosity can be reduced by the addition of some ions, which then improves the flotation performance.…”

Section: -mentioning

confidence: 95%

“…Illite group clay minerals have the least negative effect on flotation among the three types of clay minerals. Recent research findings at The University of Queensland showed that the negative effects of clay minerals on flotation are mainly relevant to the network structures formed (Cruz et al 2015b;Zhang et al 2015bZhang et al , 2015cWang et al 2016). It is therefore important to critically review these previous studies to understand the various effects of clay minerals on flotation and also identify the future work required for a more complete understanding of the mechanisms behind the problems.…”

Section: Introductionmentioning

confidence: 99%

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Managing clay minerals in froth flotation—A critical review

Chen

Peng

2018

Mineral Processing and Extractive Metallurgy Review

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Clay minerals are widely present in various ore deposits as gangue minerals. The processing of high-claycontent ores is becoming a significant challenge for the mining industry owing to the poor flotation performance caused by the presence of clay minerals. Different types of clay minerals are typically present in ore bodies, and they cause several detrimental effects to flotation that require different treatments. In this article, a comprehensive review of the studies on understanding and mitigating the negative effects of clay minerals in flotation is presented. It starts with a review of the classification and structures of clay minerals commonly occurring in ore deposits and their properties that determine the behavior of clay minerals in flotation. It is followed by a critical review of two main negative effects of clay minerals on flotation, the recent research findings mainly from The University of Queensland group. The first negative effect is the coating of clay minerals on the surface of valuable minerals that decreases the floatability of valuable minerals. The second negative effect is the formation of network structures in the slurry. Depending on the type and strength of the network structure, it can cause either high pulp viscosity or increased gangue entrainment, which reduces the flotation recovery and flotation product grade, respectively. In this section, the mechanisms and key factors behind each negative effect are presented and critically discussed. Then, the approaches and techniques developed to mitigate the different negative effects of clay minerals are reviewed. To conclude, future directions for a more complete understanding of mechanisms and problem solving are recommended.

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Section: -mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Managing clay minerals in froth flotation—A critical review

Chen

Peng

2018

Mineral Processing and Extractive Metallurgy Review

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“…For instance, Haga et al [21] reported that the Cu grade was improved when conditioning Cu minerals (in which the main valuable mineral is chalcopyrite) into sea water. In a Cu-Au ore flotation with chalcopyrite as the major valuable Cu mineral in the presence of bentonite, Wang et al [22] found that divalent cations of Mg 2+ and Ca 2+ had a more significant role than monovalent cations of Na + and K + in reducing bentonite viscosity due to stronger compression of electrical double layers of bentonite particles, thereby increasing flotation efficiency, similar to that found in Hirajima et al [17]. Recently, Li et al [16] reported that at pH 10, the presence of Na + , K + , Ca 2+ increased chalcopyrite recovery due to lower energy barrier for bubble-particle attachments through compressing electrostatic double-layer while the addition of Mg 2+ decreased chalcopyrite flotation efficiency due to the adsorption of formed Mg(OH) 2 precipitation onto chalcopyrite surface to reduce its hydrophobicity.…”

Section: Concentrator Location Processing Content Referencesmentioning

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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“…The presence of inorganic salts leads to more complex bubble coalescence, as inorganic ions-similar to frothers-can stabilize foams against coalescence and reduce bubble size [19,25]. The effects of salts on both floatability and frothability have been examined for copper ores [3,19,21,22,[26][27][28][29][30]. However, the effects of frothing characteristics of specific chloride salts on chalcopyrite flotation remain unclear.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Common Monovalent and Divalent Chlorides on Chalcopyrite Flotation

Xiao

et al. 2017

Minerals

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Much attention has been paid to the flotation of chalcopyrite using saline seawater. However, the influence of salt ions on mineral flotation is complex, and different salts may play various roles-either beneficial or detrimental. This study investigated the effects of common chlorides (Cl − ) of Na + , K + , Mg 2+ , and Ca 2+ in seawater on chalcopyrite floatability. The presence of Na + , K + , and Ca 2+ resulted in greater chalcopyrite recovery, with this effect being more pronounced for the monovalent cations. In contrast, the addition of Mg 2+ resulted in decreased chalcopyrite flotation efficiency. Contact angle measurements showed that the presence of monovalent cations increased the hydrophobicity of the chalcopyrite surface, while the presence of divalent cations reduced its hydrophobicity, depending on the concentration. Zeta potential, pulp species, and X-ray photoelectron spectroscopy (XPS) cross-confirmed the precipitation of Mg(OH) 2 on the chalcopyrite surface when Mg concentration was 10 −2 M and pulp pH was 10.

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The role of cations in copper flotation in the presence of bentonite

Cited by 24 publications

References 31 publications

Managing clay minerals in froth flotation—A critical review

Managing clay minerals in froth flotation—A critical review

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

The Influence of Common Monovalent and Divalent Chlorides on Chalcopyrite Flotation

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