Use of dispersants in flotation of molybdenite in seawater

Rebolledo, Erick; Laskowski, J.; Gutiérrez, Leopoldo; Castro, Saturnino Sanz de

doi:10.1016/j.mineng.2016.10.004

Cited by 57 publications

(34 citation statements)

References 4 publications

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“…Therefore, it is impractical to reduce the pulp pH to neutral or acidity when using sea water in chalcopyrite flotation. Other researchers have attempted to add some reagents to achieve the goal [19,[24][25][26][27]. For instance, Jeldres et al [24] reported that the addition of CaO-Na 2 CO 3 mixtures can remove cations before flotation.…”

Section: Concentrator Location Processing Content Referencesmentioning

confidence: 99%

“…Moreover, Rebolledo et al [26] reported that the addition of SHMP can remove Mg hydroxyl-complexes and hydroxide from molybdenite surface. However, it is not fully understood that if SHMP has similar positive effects on enhancing chalcopyrite recovery in the presence of divalent cations.…”

Section: Concentrator Location Processing Content Referencesmentioning

confidence: 99%

“…It should be noted that SHMP can not only act as a dispersant, but also can be used as a complexing agent or softener [26,39] to react with metal cations such as Ca 2+ and Mg 2+ , generating soluble complexes (Equations (1)-(3)) [26,34,36,41]. Therefore, the presence of SHMP possibly reduced the formation of Ca and Mg complexes and hydroxide, thereby relieving negative effects of divalent cations.…”

Section: Species Calculationmentioning

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: Concentrator Location Processing Content Referencesmentioning

confidence: 99%

Section: Concentrator Location Processing Content Referencesmentioning

confidence: 99%

Section: Species Calculationmentioning

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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“…Other studies have shown that the precipitates formed in saline or seawater at pH > 9.5 dominated molybdenite depression. 8,[21][22][23] Nevertheless, no generally accepted understanding of the inuence of various salts has been available to explain why saline water improves or reduces molybdenite recovery. Most studies have indicated that the anisotropic features of molybdenite with van de Waal forces occurring within its basal planes (face) and Mo-S covalent bonds at edges 11,13,24,25 play an important role in inuencing molybdenite otation.…”

Section: Introductionmentioning

confidence: 99%

“…Downloaded on 10/15/2020 9:54:11 PM. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.adsorption of hydrophilic and positive complexes and/or precipitation onto molybdenite surfaces 2,22,23.…”

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confidence: 99%