Comparing the effect of salts and frother (MIBC) on gas dispersion and froth properties

Quinn, J.J.; Kracht, Willy; Gómez, C.O.; Gagnon, Christian; Finch, J.A.

doi:10.1016/j.mineng.2007.07.007

Cited by 152 publications

(77 citation statements)

References 13 publications

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“…Batu Hijau Indonesia Using sea water to process a gold-rich porphyry copper ore [7] Las luses Chile Grinding and flotation using mixed sea water and tailing dam water [6] Çayeli Bakır Is letmeleri A.S. Turkey Processing Cu-Zn sulfide ore using dissolved metal ions and sulfide ions (SO 4 2− and S 2 O 3 2− ) [8] Mt Keith Australia Processing nickel minerals using bore water with high ionic strength [9] Raglan Canada Flotation without frother using saline water with salt levels ranging 20,000~35,000 ppm [10] Inevitably, the application of those solutions with a very high salinity brought many challenges for mineral processing. One of the crucial issues is how to maintain the recovery and grade of valuable minerals as well as minimize the dosage of flotation reagents [3].…”

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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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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“…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].…”

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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“…It has been recognized that use of process water or saline water especially under a turbulent condition can increase flotation recovery and reduce frother dosage (Craig et al, 1993;Li and Somasundaran, 1993;Ozdemir et al, 2009;Castro and Laskowski, 2011;Castro et al, 2013;Quinn et al, 2007Quinn et al, , 2014. For instance, Quinn et al (2007) found that 23,400 ppm (= 0.4 M) NaCl could give a bubble size and a gas hold up similar to those of 10 ppm of MIBC, suggesting the importance of water quality on flotation performance and thus the need to investigate the interactions between frothers and inorganic electrolytes. There are a number of studies that have reported the interactions between different types of electrolytes and MIBC (Kurniawan et al, 2011;Castro et al, 2013;Bournival et al, 2014a) but none has addressed such interactions with MCHM.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

A comparative study of methyl cyclohexanemethanol and methyl isobutyl carbinol as frother for coal flotation

Park

Wang

2016

International Journal of Mineral Processing

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Methyl isobutyl carbinol (MIBC), an aliphatic alcohol, is widely used as a frothing reagent in coal flotation but it has safety concerns owing to its low flash point (approximately 40 °C). In the present work, we studied a cyclic alcohol, methyl cyclohexanemethanol (MCHM) with a high flash point (approximately 110 °C) and compared its coal flotation performance with that of MIBC. A bottom-driven mechanical flotation cell and two coking coals of distinct floatability, namely A and B, were used. Collectorless flotation tests were carried out with process water for coal A. Flotation tests with diesel as collector at 50 ppm were carried out with simulated process water (0.03 M NaCl solution) and highly saline water (0.5 M NaCl solution), respectively, for coal B. The flotation results showed that MCHM was an effective alternative to MIBC. The highly saline water produced sufficient frothing, obviating the necessity of adding MIBC or MCHM. To understand the effect of frother type and concentration and NaCl concentration on the coal flotation performance, we conducted surface tension measurement for the frother solutions, characterised the dispersion of air near bubble sparger, and measured the stabilities of froth, foam, and foam film. It was found that MCHM was more surface active and more capable of stabilizing froth and foam than MIBC.Foam film stability measured at a broad range of interface approach velocity followed a bellshaped trend and at a given NaCl concentration, the observed peak foam film stability of 15 ppm MCHM was higher than that of 15 ppm MIBC. Increasing NaCl concentration from 0.03 M to 0.5 M had the effect of stabilizing the froth and foam but destabilising the thin foam film.

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Comparing the effect of salts and frother (MIBC) on gas dispersion and froth properties

Cited by 152 publications

References 13 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 Influence of Common Monovalent and Divalent Chlorides on Chalcopyrite Flotation

A comparative study of methyl cyclohexanemethanol and methyl isobutyl carbinol as frother for coal flotation

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