Sodium hexametaphosphate and sodium silicate as dispersants to reduce the negative effect of kaolinite on the flotation of chalcopyrite in seawater

Ramírez, Adriana Citlali; Rojas, Ailynne; Gutiérrez, Leopoldo; Laskowski, J.

doi:10.1016/j.mineng.2018.05.008

Cited by 58 publications

(34 citation statements)

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“…In both industrial implementation and fundamental studies, sodium silicate (SS) and sodium hexametaphosphate (SH) are commonly used as dispersants to disperse hydrophilic substances from the surface of valuable minerals. [18][19][20] Recently, more attention has been paid to the effects of these dispersants on mineral otation in seawater. For instance, our previous studies 21,22 have shown that the addition of SH can form dissolvable complexes with Mg 2+ , reducing the generation and adsorption of hydrophilic complexes on mineral surfaces.…”

Section: Introductionmentioning

confidence: 99%

New insights into the beneficial roles of dispersants in reducing negative influence of Mg²⁺ on molybdenite flotation

Yang

et al. 2020

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

New insights into the beneficial roles of dispersants in reducing negative influence of Mg²⁺ on molybdenite flotation

Yang

et al. 2020

RSC Adv.

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“…2− , Cl − ), which induce important changes on the surface properties of Cu-Mo sulfides and thus on the flotation efficiency [19][20][21][22][23][24]. Previous studies showed that flotation of molybdenite from Cu-Mo sulfide ores in seawater is depressed as pH is increased to depress pyrite, which was explained by the heterocoagulation between magnesium hydroxo-complexes and molybdenite [25][26][27][28].…”

Section: Seawater Flotationmentioning

confidence: 99%

Influence of Seawater on the Degree of Entrainment in the Flotation of a Synthetic Copper Ore

et al. 2020

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Froth flotation is a process in which hydrophobic particles attach to bubbles forming particle–bubble aggregates, which are transported to the top section of the cell where they overflow to form the concentrate. Particles also reach the concentrate by entrainment, which is a non-selective process that leads to low concentrate grades. The objective of this work was to study and compare the degree of entrainment measured using three methods, in fresh and seawater, and using methyl isobutyl carbinol (MIBC) and DF-250 as frothers. The experimental results indicated that the degree of entrainment decreased in seawater. Besides, water recovery was lower in the experiments with seawater regardless of the frother that was used in the experiments, which correlated with the observed low degrees of entrainment. It is proposed that the reduction of entrainment and water recovery in seawater can be explained by a reduction of air recovery and/or more bubble coalescence in the froth. It is also proposed that surfactant diffusion/convection from the lamellae to the Plateau borders in the froth is reduced in seawater, which reduces the surface tension gradients, and thus the restoring liquid flow from the Plateau borders to the lamellae.

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“…Mathur and Moudgil's [40] study revealed that the simple presence of isolated hydroxyls on oxide surfaces does not necessarily result in adsorption of PEO. [41] evaluated the effect of sodium hexametaphosphate in the flotation of chalcopyrite in the presence of kaolinite in sea water over the pH range from 7 to 11 and reported that this clay dispersant depresses kaolinite under such conditions. The preceding statement corroborates the results obtained in this work.…”

Section: Flocculation Testsmentioning

confidence: 99%

Effect of Electrolyte Concentration in Process Water on Flocculation

Moreno-Chávez

2019

J. Mex. Chem. Soc.

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Abstract. The effect of electrolyte concentration and potential determining ions on the coagulation and flocculation of illite, dolomite, and illite-dolomite mixture suspensions was investigated. Electrokinetic measurements, settling rate tests, and viscosity measurements were performed to examine the stability of these mineral suspensions and to characterize flocculants under various physico-chemical conditions. Two flocculants: A-100 anionic polyacrylamide (PAM) and polyethylene oxide (PEO) were employed. The tests revealed that polyethylene oxide does not flocculate dolomite under any tested conditions. Viscosity results corroborated that the conformation of PAM macro- molecules in water is very sensitive to electrolyte concentration; on the other hand, the conformational state of PEO macromolecules is not affected by ionic strength. The intrinsic viscosity measurements suggest that the unattainable flocculation of dolomite suspensions with PEO must result from poor adsorption of this flocculant onto dolomite particles. In both tested cases, with PAM and PEO, the relationship between coagulation and flocculation was not confirmed. Resumen. Se investigó el efecto de la concentración electrolítica y iones determinantes de potencial en la coagulación y floculación de suspensiones de ilita, dolomita y mezcla de ilita-dolomita. Mediciones electrocinéticas, ensayos de velocidad de sedimentación, y mediciones de viscosidad fueron realizadas para examinar la estabilidad de estas suspensiones minerales y caracterizar floculantes bajo varias condiciones fisicoquímicas. Se empleó dos floculantes: A-100 poliacrilamida aniónica (PAM) y óxido de polietileno (PEO). Los experimentos revelaron que el óxido de polietileno no flocula la dolomita bajo ninguna condición empleada. Los resultados de viscosidad corroboraron que la conformación de las macromoléculas PAM en agua es sensible a la concentración electrolítica; por otro lado, el estado conformacional de las macromoléculas de PEO no se ve afectado por la fuerza iónica. Las mediciones de viscosidad intrínseca sugieren que la floculación inalcanzable de las suspensiones de dolomita con PEO debe ser resultado de una mala adsorción de este floculante en las partículas de dolomita. En ambos casos probados, con PAM y PEO, no se confirmó la relación entre coagulación y floculación.

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Sodium hexametaphosphate and sodium silicate as dispersants to reduce the negative effect of kaolinite on the flotation of chalcopyrite in seawater

Cited by 58 publications

References 10 publications

New insights into the beneficial roles of dispersants in reducing negative influence of Mg²⁺ on molybdenite flotation

New insights into the beneficial roles of dispersants in reducing negative influence of Mg²⁺ on molybdenite flotation

Influence of Seawater on the Degree of Entrainment in the Flotation of a Synthetic Copper Ore

Effect of Electrolyte Concentration in Process Water on Flocculation

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Sodium hexametaphosphate and sodium silicate as dispersants to reduce the negative effect of kaolinite on the flotation of chalcopyrite in seawater

Cited by 58 publications

References 10 publications

New insights into the beneficial roles of dispersants in reducing negative influence of Mg2+ on molybdenite flotation

New insights into the beneficial roles of dispersants in reducing negative influence of Mg2+ on molybdenite flotation

Influence of Seawater on the Degree of Entrainment in the Flotation of a Synthetic Copper Ore

Effect of Electrolyte Concentration in Process Water on Flocculation

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New insights into the beneficial roles of dispersants in reducing negative influence of Mg²⁺ on molybdenite flotation

New insights into the beneficial roles of dispersants in reducing negative influence of Mg²⁺ on molybdenite flotation