Natural oleophilicity/hydrophobicity of sulphide minerals, I. Galena

Kocabağ, Duran; Kelsall, G. H.; Shergold, H.L.

doi:10.1016/0301-7516(90)90053-2

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…Kocabag et al discussed that collectorless flotation of galena is due to the mineral's natural oleophilicity, which in turn is pH-Eh dependent [66]. A relatively low pH value (but >2) of the flotation pulp favors collectorless flotation of galena (recovery of over 75% with a maximum at a pH of approx.…”

Section: Collectorless Flotation Of Galenamentioning

confidence: 99%

“…A relatively low pH value (but >2) of the flotation pulp favors collectorless flotation of galena (recovery of over 75% with a maximum at a pH of approx. 5.5) due to the formation of elemental sulfur on the mineral's surface, while, in weak alkaline conditions, galena is depressed due to the formation of hydrophilic Pb(OH) 2 and HpbO 2 − [14,66]. Galena exhibits a collectorless floatability in the pH-Eh region where metastable elemental sulfur exists, indicating that the sulfur species are the hydrophobic entities that render the mineral surface hydrophobic.…”

Section: Collectorless Flotation Of Galenamentioning

confidence: 99%

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Control of Non-Ferrous Metal-Sulfide Minerals’ Flotation via Pulp Potential

Panayotova

2023

Minerals

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Studies on the dependence of the technological results of non-ferrous sulfide ore (copper—arsenic-bearing and non-arsenic-bearing—lead–zinc, and polymetallic) flotation on the pulp potential Eh are reviewed. Findings on the relation of Eh and collectorless flotation are presented. Changes in the pulp potential due to different gas applications and various reagent additions are considered. The influence of the grinding medium on the pulp Eh and hence on the flotation results is presented through various examples. The relation between the oxidation–reduction potential and reagent effects is exhibited and explained. pH–Eh ranges of different minerals’ flotation, as recorded in various studies, are summarized and visualized jointly for all mentioned ores. It is concluded that the pulp Eh value, considered together with the pH value, is a useful means for flotation selection controlling and deserves further research, especially under industrial conditions. Some problems and difficulties in using pulp Eh for flotation control are discussed.

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Section: Collectorless Flotation Of Galenamentioning

confidence: 99%

Section: Collectorless Flotation Of Galenamentioning

confidence: 99%

Control of Non-Ferrous Metal-Sulfide Minerals’ Flotation via Pulp Potential

Panayotova

2023

Minerals

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“…The milling environment was believed to be more anoxic through galvanic interactions, by which the noble sulfide minerals will be protected from oxidation because of the sacrificial dissolution of the active grinding media of iron. − Therefore, the surface oxidation of sulfide minerals is most likely inhibited in practical grinding circuits. However, in a laboratory, sample preparation involving wet grinding and ultrasonic cleaning with water could result in considerable surface oxidation prior to flotation, influencing the floatation behavior of sulfide minerals. − These conflicting reports concerning the flotation behavior of galena might have neglected this significant fact.…”

Section: Introductionmentioning

confidence: 99%

Correlation of Surface Adsorption and Oxidation with a Floatability Difference of Galena and Pyrite in High-Alkaline Lime Systems

et al. 2018

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When it comes to Pb-Zn ores with high amounts of pyrite, the major problem encountered is the low separation efficiency between galena and pyrite. By virtue of high dosage of lime and collector sodium diethyl dithiocarbamate (DDTC), pyrite and zinc minerals are depressed, allowing the galena to be floated. However, there have been significant conflicting reports on the flotation behavior of galena at high pH. In this context, correlation of the surface adsorption and oxidation with the floatability difference of galena and pyrite in high-alkaline lime systems would be a key issue for process optimization. Captive bubble contact angle measurements were performed on freshly polished mineral surfaces in situ exposed to lime solutions of varying pH as a function of immersion time. Furthermore, single mineral microflotation tests were conducted. Both tests indicated that the degree of hydrophobicity on the surfaces of galena and pyrite increased in the presence of DDTC at natural or mild pulp pH. While in a saturated lime solution, at pH 12.5, DDTC only worked for galena, but not for pyrite. Surface chemistry analysis by time-of-flight secondary ion mass spectrometry (Tof-SIMS) confirmed the preference of DDTC on the galena surface at pH 12.5, which contributed to a merit recovery. Further important evidence through measurements of Tof-SIMS, ion chromatography, and high-performance liquid chromatography indicated that in high-alkaline lime systems, the merit floatability of galena could exclude the insignificant contribution of elemental sulfur (S) and was dominantly attributed by the strong adsorption of DDTC. In contrast, the poor flotation response of pyrite at high pH was due to the prevailing adsorption of CaOH species. This study provides an important surface chemistry evidence for a better understanding of the mechanism on the better selectivity in the galena-pyrite separation adopting high-alkaline lime systems.

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