The effect of clay minerals on the process of flotation of copper ores - A critical review

Jeldres, Ricardo I.; Uribe, Lina; Cisternas, Luís A.; Gutiérrez, Leopoldo; Leiva, Williams H.; Valenzuela, Julio

doi:10.1016/j.clay.2019.01.013

Cited by 55 publications

(43 citation statements)

References 92 publications

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“…Copper concentration operations in freshwater are normally carried out under highly alkaline conditions (above pH 10.5) to depress pyrite and prevent contamination of the concentrate [16][17][18]; however, it is challenging to operate in seawater at this condition and, generally, the processes are restricted to the natural pH (approx. pH 8), requiring further reagents to deal with the quality of concentrates [5,19].…”

Section: Introductionmentioning

confidence: 99%

Viscoelasticity of Quartz and Kaolin Slurries in Seawater: Importance of Magnesium Precipitates

Jeldres

Fuentes

Robles

et al. 2019

Metals

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In this study, the viscoelastic properties of quartz and kaolin suspensions in seawater were analysed considering two distinct conditions: pH 8 and 10.7. Creep and oscillatory sweep tests provided the rheological parameters. An Anton Paar MCR 102 rheometer (ANAMIN Group, Santiago, Chile) was used with a vane-in-cup configuration, and the data were processed with RheoCompassTM Light software (ANAMIN Group, Santiago, Chile). The outcomes were associated with the formation of solid species principally composed of magnesium precipitates. The magnesium in solution reduced in the presence of quartz (68 wt %), from 1380 to 1280 mg/L. Since the difference was not large regarding the solid-free seawater, the disposition of solid complexes at pH 10.7 was expected to be similar. The jump in pH caused both yield stress and viscoelastic moduli to drop, suggesting that the solid precipitates diminished the strength of the particle networks that made up the suspension. For the kaolin slurries (37 wt %), the yield stress raised when the pH increased, but unlike quartz, there was significant adsorption of magnesium cations. In fact, the concentration of magnesium in solution fell from 1380 to 658 mg/L. Dynamic oscillatory assays revealed structural changes in both pulps; in particular, the phase angle was greater at pH 8 than at pH 10.7, which indicates that at more alkaline conditions, the suspension exhibits a more solid-like character.

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Section: Introductionmentioning

confidence: 99%

Viscoelasticity of Quartz and Kaolin Slurries in Seawater: Importance of Magnesium Precipitates

Jeldres

Fuentes

Robles

et al. 2019

Metals

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“…Since the presence of numerous fine/ultrafine particles (colloidal particles and clays) is a characteristic of pulps comprising low-grade and complex ores, interparticle interaction force becomes one of the most important aspects to determine the rheological properties of flotation pulps [10,40]. Various mineral particles with different surface properties and a broad size distribution commonly exist in this type of flotation pulps, and therefore, many interactions can occur.…”

Section: Interparticle Interactionmentioning

confidence: 99%

“…Rheology can be a useful tool for flotation optimization. Many approaches have been tried to mitigate the deleterious effects caused by rheology in flotation, but these methods mainly focus on the pulp zone [40,77]. In mineral flotation, it is known that the nature of pulp and froth determines their rheological behaviour.…”

Section: Mitigating Rheological Problems In Flotationmentioning

confidence: 99%

“…In flotation, the chemicals of many types have been tried to control the rheological properties of flotation pulps. e literature shows that rheology modifiers (dispersants) can be used to reduce the negative rheological impact of problematic ores with clay minerals in flotation [40,76,77]. For example, in studies by Seaman et al [100] and Wei et al [101] where biopolymers such as lignosulfonate-based polymers were used as effective clay dispersants to improve the flotation performance, the possible role of reduced pulp viscosity in the improved flotation was addressed by Chen and Peng [10] in addition to the effect of reduced slime coating of clays onto the valuables.…”

Section: Mitigating Rheological Problems In Flotationmentioning

confidence: 99%

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A Brief Review of Pulp and Froth Rheology in Mineral Flotation

Wang

2020

Journal of Chemistry

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In mineral flotation, rheological problems have limited the efficient upgrading of low-grade and complex ores. Since pulp and froth rheology are deemed to play different roles in influencing the separation performance, in this paper, a brief review on pulp and froth rheology in flotation is provided, with an objective of developing a basic understanding of rheology in flotation. The essential variables that affect the rheology of a flotation pulp and froth are discussed. The methods for measuring pulp and froth rheology are presented. The correlations of pulp and froth rheological properties to flotation performance are reviewed. Strategies that are currently used to mitigate the deleterious effects of problematic ores in flotation are also provided for flotation optimization. Research gaps are also proposed to highlight the need of further exploration of flotation rheology in future.

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“…Clays are highly muddied associated minerals (gangue) (Zhao et al, 2018;Zhang et al, 2019;Zhao et al, 2019a), and it usually exists in microparticles at less than 2 µm (Bergaya et al, 2013;Xiong et al, 2017) in most industrial mine tailings (Pendharker et al, 2017;Zhao et al, 2019b), which has a very adverse effect on the sedimentation (Chen et al, 2016;Chen et al, 2017), separation (Yu et al, 2017;Xing et al, 2017;Jeldres et al, 2019) and dewatering of mine tailings. This is because clay mineral characterized as strong hydrophilic surfaces, extraordinarily fine granularity and strong electronegativity of the particle surfaces.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of methylamine cations on kaolinite basal surfaces: A DFT study

Chen¹,

Min²,

Liu³

et al. 2020

Physicochem. Probl. Miner. Process.

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To explore the interaction of alkylamine surfactants with kaolinite, the density functional theory (DFT) method was used to calculate the single adsorption of different methylamine cation on kaolinite basal surfaces and the competitive adsorption of methylamine cation and water molecule on kaolinite basal surfaces, respectively. Different methylamine cations can adsorb on kaolinite basal surfaces by electrostatic interaction and hydrogen bonds, and the methylamine cations more easily adsorbed on kaolinite Si-O surface. In the case of competitive adsorption with water molecule, the methylamine cation is capable of flushing out the surrounding water molecule to get rid of its steric effect and stably adsorbing on kaolinite basal surfaces, and the adsorption state of the competitive adsorption system is more stable. The adsorption mechanism of methylamine cation on kaolinite basal surface should be the result of electrostatic interaction and hydrogen bonds, and the electrostatic interaction plays the main role.

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The effect of clay minerals on the process of flotation of copper ores - A critical review

Cited by 55 publications

References 92 publications

Viscoelasticity of Quartz and Kaolin Slurries in Seawater: Importance of Magnesium Precipitates

Viscoelasticity of Quartz and Kaolin Slurries in Seawater: Importance of Magnesium Precipitates

A Brief Review of Pulp and Froth Rheology in Mineral Flotation

Adsorption of methylamine cations on kaolinite basal surfaces: A DFT study

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