Depressant Action of Ca and Mg on Flotation of Cu Activated Sphalerite

Lascelles, D.; Finch, J.A.; Sui, C.

doi:10.1179/cmq.2003.42.2.133

Cited by 24 publications

(6 citation statements)

References 8 publications

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“…As can be seen, magnesium concentration varies from 11 to 471 mg/L but, since very high concentrations would make very difficult the experimentation, 50 mg/L was chosen as a proper value. This value is in accordance with previous research [8,9]. It is also observed the presence of chemical species as iron, lead, zinc, copper, calcium, and sulfate; these species are derived from the mineral species contained in the ore like copper sulfides (e.g., chalcopyrite and bornite), pyrite, and nonsulfide gangue.…”

Section: Process Water Chemical Charaterizationsupporting

confidence: 92%

“…Mirnezami et al [19] have shown that MgOH + adsorbs onto sphalerite at pH below 10, while at more alkaline conditions, precipitation and coagulation of Mg(OH) 2 also occurs. Thus, decreasing the number of available sites for xanthate adsorption [9]. Magnesium hydroxide (Mg(OH) 2 ) is slightly positively charged at pH from 9.5 to 10, values at which precipitation begins [20].…”

Section: Effect Of Magnesium On the Contact Angle Of Cu-activated Sphaleritementioning

confidence: 99%

“…Lascelles et al [9] studied the effect of magnesium (50 mg/L) on the flotation behavior of Cu-activated sphalerite in the range of pH from 8 to 13 and compared it with the effect of calcium (500 mg/L). The authors found that the flotation of Cu-activated sphalerite with ethyl xanthate was depressed by magnesium at pH above 10.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Magnesium on the Hydrophobicity of Sphalerite

et al. 2021

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The use of untreated recycled water has negative effects in the flotation of zinc sulfide ores due to the presence of dissolved species, such as magnesium and calcium. Although it has been found that magnesium is a more potent depressant than calcium, it has not been investigated in this role or for the effect of adding sodium carbonate. The results of an investigation to evaluate the effect of magnesium on the hydrophobicity of Cu-activated sphalerite conditioned with Sodium Isopropyl Xanthate (SIPX) are presented. Zeta potential of natural and Cu-activated sphalerite as a function of the conditioning pH and Cu(II) concentration, respectively, was first evaluated. Later, the effect of pH and presence of magnesium on the contact angle of Cu-activated sphalerite conditioned with SIPX was studied; it was also evaluated the effect of sodium carbonate to counteract the effect of magnesium. Cu-activation enhances the zeta potential of sphalerite up to a concentration of 5 mg/L. Contact angle tests, thermodynamic simulation, and surface analysis showed that magnesium hydroxide precipitates on the sphalerite surface at pH 9.6, decreasing its hydrophobicity. Addition of sodium carbonate as alkalinizing agent precipitates the magnesium in the form of a species that remained dispersed in the bulk solution, favoring the contact angle of Cu-activated sphalerite and, consequently, its hydrophobicity. It is concluded that the use of sodium carbonate as alkalinizing agent favors the precipitation of magnesium as hydromagnesite (Mg5(OH)2(CO3)4∙4H2O) instead of hydroxide allowing the recovery of sphalerite.

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Section: Process Water Chemical Charaterizationsupporting

confidence: 92%

Section: Effect Of Magnesium On the Contact Angle Of Cu-activated Sphaleritementioning

confidence: 99%

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Effect of Magnesium on the Hydrophobicity of Sphalerite

et al. 2021

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“…Therefore, at high pH condition, Ca 2+ , Mg 2+ and Sr 2+ exerts stronger depression than at low pH condition due to higher adsorption density. The hydrolyzation of Mg 2+ is stronger than that of Ca 2+ and Sr 2+ , at pH 11 magnesium ions mainly presented as Mg(OH) 2 (aq) ( Figure 10b); therefore, the effect of Mg 2+ on zeta potential was more pronounced, leading to stronger depression on flotation [19,31]. The hydrolyzation of Sr 2+ is the weakest among Ca 2+ , Mg 2+ and Sr 2+ , even at pH 11 the percentage of SrOH + relative to the total strontium content was still very low (Figure 10c).…”

Section: Discussionmentioning

confidence: 99%

“…In the flotation of cassiterite, Pb 2+ is adsorbed onto mineral surfaces through the interaction between lead species and oxygen sites of cassiterite surfaces to form Sn-O-Pb + ; this phenomenon increases collector adsorption and, hence, increases the floatability of cassiterite [17], while the adsorption of Fe 3+ on cassiterite surfaces inhibits collector adsorption and depresses cassiterite flotation [18]. Ca 2+ and Mg 2+ commonly presents in flotation process waters and effect the flotation of many minerals: Ca 2+ , Mg 2+ was found to significantly reduce flotation recovery of Cu activated sphalerite when pH exceeded that for the formation of the corresponding hydroxide precipitate [19], while the adsorption of calcium hydroxide on spodumene surfaces effectively activates the flotation of spodumene [20]. Although the influence of metal ions on mineral flotation has been widely studied, nevertheless, the implications of metal ions for bastnaesite flotation are still unclear and minimal information is available in published literature.…”

Section: Introductionmentioning

confidence: 99%

Metal Ion Release in Bastnaesite Flotation System and Implications for Flotation

Cao

et al. 2018

Minerals

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Ca 2+ , Mg 2+ , Sr 2+ and Fe 3+ were found to be commonly released into bastnaesite flotation pulp from minerals with relatively high concentrations. The influence and corresponding mechanism of Ca 2+ , Mg 2+ , Sr 2+ , Fe 3+ and Al 3+ , on bastnaesite flotation, have been studied by micro flotation tests, induction time measurements, adsorption measurements and solution chemistry analysis. It was found that all aforementioned metal ions depressed bastnaesite flotation. The order of depression ability was Fe 3+ > Al 3+ > Mg 2+ > Sr 2+ > Ca 2+ and the depression ability changed along with pH. The depression was mainly attributed to the adsorption of metals ions, which hindered collector adsorption. The species diagrams of metal ions changed along with pH, consequently changing the adsorption of metal ions on mineral surfaces, and therefore leading to different influences on flotation.

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