Flotation behaviour of malachite in mono- and di-valent salt solutions using sodium oleate as a collector

Choi, Jin-Young; Choi, Siyoung Q.; Park, Kyuhyeong; Han, Yosep; Kim, Hyung-Seok

doi:10.1016/j.minpro.2015.11.011

Cited by 78 publications

(23 citation statements)

References 58 publications

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“…However, chalcopyrite recovery was gradually decreased within this pH region, indicating that CaOH + and Ca(OH) 2(aq) complexes might play a predominantly negative role on chalcopyrite flotation. Choi et al [14] and Liu and Zhang [39] reported that hydrolyzed species had a strong affinity to a negatively charged solid surface, i.e., chalcopyrite surface in this study. The adsorption of these hydrolyzed species decreased natural hydrophobicity of chalcopyrite surface, thereby reducing its recovery.…”

Section: Species Calculationsupporting

confidence: 59%

“…Compared to Ca complexes, Mg(OH) 2(s) played a more significant role in reversing chalcopyrite zeta potential to positive values. Choi et al [14] also reported a similar zeta potential change of malachite from negative to positive when treated in CaCl 2 solution. Schott [43] found that the zero point of charge of Mg(OH) 2(s) was at pH 10.8, indicating that the zeta potential of Mg(OH) 2(s) was positive when pH was lower than 10.8.…”

Section: Species Calculationmentioning

confidence: 64%

“…In the flotation process, the presence of salt ions can increase the complexity of flotation pulp environment by changing pulp water structure, mineral particle properties (e.g., hydration and electrical double layer) and bubble properties (e.g., bubble coalescence and froth stability), which in turn influencing the mineral-bubble attachment and flotation efficiency [2,[11][12][13]. For instance, some monovalent salts (i.e., NaCl and KCl) were found to enhance mineral flotability by compressing electrical double layers, reducing the energy bar for particle-bubble attachment and even changing bubble stability [14][15][16]. In contrast, the presence of some divalent cations such as Ca 2+ and Mg 2+ might form metal hydroxyl-complexes and colloidal precipitation onto hydrophobic mineral surfaces under alkaline conditions, reducing mineral surface hydrophobicity and the adsorption of collectors [17][18][19].…”

Section: Concentrator Location Processing Content Referencesmentioning

confidence: 99%

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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: Species Calculationsupporting

confidence: 59%

Section: Species Calculationmentioning

confidence: 64%

Section: Concentrator Location Processing Content Referencesmentioning

confidence: 99%

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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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“…This can be explained by two approaches: The first is the consequence of the "salting-out effect" whereby the solubility of proteins decreased with salt concentration [30,35,36]. The second is the result of the hydration effect occurring when the concentration was significantly high (i.e., 1 M NaCl) [38,39]. The maximum value of removal turbidity efficiency (91.07%) was obtained for the coagulant agent extracted with a 0.5 M NaCl solution.…”

Section: Effect Of Coagulant Dosage On Turbidity Removal Efficiency Fmentioning

confidence: 99%

Use of Acorn Leaves as a Natural Coagulant in a Drinking Water Treatment Plant

Benalia

Derbal

Pánico

et al. 2018

Water

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In this study, the use of acorn leaves as a natural coagulant to reduce raw water turbidity and globally improve drinking water quality was investigated. The raw water was collected from a drinking water treatment plant located in Mila (Algeria) with an initial turbidity of 13.0 ± 0.1 NTU. To obtain acorn leaf powder as a coagulant, the acorn leaves were previously cleaned, washed with tap water, dried, ground and then finely sieved. To improve the coagulant activity and, consequently, the turbidity removal efficiency, the fine powder was also preliminarily treated with different solvents, as follows, in order to extract the coagulant agent: (i) distilled water; (ii) solutions of NaCl (0.25; 0.5 and 1 M); (iii) solutions of NaOH (0.025; 0.05 and 0.1 M); and (iv) solutions of HCl (0.025; 0.05 and 0.1 M). Standard Jar Test assays were conducted to evaluate the performance of the coagulant in the different considered operational conditions. Results of the study indicated that at low turbidity (e.g., 13.0 ± 0.1 NTU), the raw acorn leaf powder and those treated with distilled water (DW) were able to decrease the turbidity to 3.69 ± 0.06 and 1.97 ± 0.03 NTU, respectively. The use of sodium chloride solution (AC-NaCl) at 0.5 M resulted in a high turbidity removal efficiency (91.07%) compared to solutions with different concentrations (0.25 and 1 M). Concerning solutions of sodium hydroxide (AC-NaOH) and hydrogen chloride (AC-HCl), the lowest final turbidities of 1.83 ± 0.13 and 0.92 ± 0.02 NTU were obtained when the concentrations of the solutions were set at 0.05 and 0.1 M, respectively. Finally, in this study, other water quality parameters, such as total alkalinity hardness, pH, electrical conductivity and organic matters content, were measured to assess the coagulant performance on drinking water treatment.

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“…On the other hand, due to the water quality, dissolution of minerals and consumption of grinding medium, a certain amount of metal ions, such as Ca 2+ , Mg 2+ , Al 3+ and Fe 3+ , are inevitably present in the pulp of the actual flotation system [1,2]. Extensive research [2][3][4][5][6][7][8][9] has proven that the floatability of various minerals can be adversely affected by metal ions in the pulp.…”

Section: Introductionmentioning

confidence: 99%

Effects of Metal Ions on the Flotation of Apatite, Dolomite and Quartz

et al. 2018

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Abstract:The effects of Ca 2+ , Mg 2+ , Al 3+ , and Fe 3+ on the flotation behaviors of apatite, dolomite and quartz were investigated through a micro-flotation test, and the influence of calcium ions on the flotation of these minerals was further elucidated by solution chemistry study, zeta potential measurement, and X-ray photoelectron spectroscopy (XPS) analyses. The results indicate that an appropriate amount of Ca 2+ and Mg 2+ can improve the floatability of apatite but had a negligible effect on the flotation performance of dolomite, whereas Al 3+ , Fe 3+ , and excessive amounts of Ca 2+ decreased the recovery of apatite and dolomite. The studied metal cations can activate quartz at a particular pH. It can be inferred from solution chemistry and zeta potential measurement that the influence of metal ions on the flotation of different minerals should be attributed to the adsorption of various hydrolysis species on the mineral surfaces. XPS analyses reveal that calcium ions can enhance the adsorption of anionic collector on apatite and quartz surfaces, and there are no apparent changes to be observed on the surface of dolomite in the absence and presence of calcium ions at a concentration of 2.5 × 10 −3 M, which was in good agreement with the micro-flotation results.

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Flotation behaviour of malachite in mono- and di-valent salt solutions using sodium oleate as a collector

Cited by 78 publications

References 58 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

Use of Acorn Leaves as a Natural Coagulant in a Drinking Water Treatment Plant

Effects of Metal Ions on the Flotation of Apatite, Dolomite and Quartz

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