The critical degree of mineral surface oxidation in copper sulphide flotation

Moimane, Tiisetso; Plackowski, Chris; Peng, Yongjun

doi:10.1016/j.mineng.2019.106075

Cited by 34 publications

(13 citation statements)

References 27 publications

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“…Oxidation of sulfide minerals notably affects their hydrophobicity and floatability but flotation reagents play the main role in their recovery and separation [2,5,[8][9][10]18,22,[91][92][93][94]. Sulfhydryl collectors, particularly alkyl xanthates are the most common reagents [2,5,8,10], so we restrict this overview to xanthates as a representative example.…”

Section: Flotation Reagentsmentioning

confidence: 99%

“…The main efforts of researchers have been concentrated on elucidating the chemical state of adsorbates [10,18,22,23,[29][30][31][95][96][97][98][99][100][101][102][103]. It has been established [92][93][94][95][96][97][98][99][100][101][102][103] that alkyl xanthates of alkali metals can be attached to sulfide mineral surfaces as chemisorbed xanthate radicals, metal xanthates, or dialkyl dixanthogens, depending on the nature of the mineral, collector concentration, electrochemical potential and mineral pre-oxidation, and other conditions. Nevertheless, a large amount of uncertainty still remains because the analytical techniques have insufficient surface sensitivity and the lack of in situ measurements, particularly in technological media.…”

Section: Flotation Reagentsmentioning

confidence: 99%

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X-ray Photoelectron Spectroscopy in Mineral Processing Studies

Mikhlin

2020

Applied Sciences

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Surface phenomena play the crucial role in the behavior of sulfide minerals in mineral processing of base and precious metal ores, including flotation, leaching, and environmental concerns. X-ray photoelectron spectroscopy (XPS) is the main experimental technique for surface characterization at present. However, there exist a number of problems related with complex composition of natural mineral systems, and instability of surface species and mineral/aqueous phase interfaces in the spectrometer vacuum. This overview describes contemporary XPS methods in terms of categorization and quantitative analysis of oxidation products, adsorbates and non-stoichiometric layers of sulfide phases, depth and lateral spatial resolution for minerals and ores under conditions related to mineral processing and hydrometallurgy. Specific practices allowing to preserve volatile species, e.g., elemental sulfur, polysulfide anions and flotation collectors, as well as solid/liquid interfaces are surveyed; in particular, the prospects of ambient pressure XPS and cryo-XPS of fast-frozen wet mineral pastes are discussed. It is also emphasized that further insights into the surface characteristics of individual minerals in technological slurries need new protocols of sample preparation in conjunction with high spatial resolution photoelectron spectroscopy that is still unavailable or unutilized in practice.

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Section: Flotation Reagentsmentioning

confidence: 99%

Section: Flotation Reagentsmentioning

confidence: 99%

X-ray Photoelectron Spectroscopy in Mineral Processing Studies

Mikhlin

2020

Applied Sciences

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“…Chalcopyrite, as the most abundant and widespread copper-bearing mineral (accounting for nearly 70% of the Earth's copper), is a primary source of copper [1][2][3]. Froth flotation is the most often used method to obtain chalcopyrite from natural ores due to its natural floatability stemming from different surface properties [4,5]. However, surface oxidation due to exposure to air or solution during the flotation process may alter the surface wettability of chalcopyrite, thereby influencing the adsorption of collectors and the subsequent separation from gangue minerals [6].…”

Section: Introductionmentioning

confidence: 99%

A Quantitative Relationship between Oxidation Index and Chalcopyrite Flotation Recovery

Yang

Chen

et al. 2022

Minerals

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The surface oxidation of chalcopyrite is one of the most important factors affecting its flotation performance. In this study, a critical oxidation degree is proposed to define “slight” and “significant” oxidation in terms of surface species and chalcopyrite flotation recovery. Slight oxidation enhanced chalcopyrite hydrophobicity, but significant oxidation reduced its recovery apparently. Microthermokinetic measurements indicated that the apparent activation energy (Ea) of chalcopyrite oxidation was reduced from around 173 kJ·mol−1 to 163 kJ·mol−1 when the reaction changed from slight oxidation to significant oxidation when applying H2O2. The surface oxidation degree was defined as the ratio of hydrophilic species to hydrophobic species. The highest recovery (94.8%) and contact angle (93°) were achieved at a concentration of 0.1 vol.% H2O2, with the lowest oxidation degree of 0.388 being observed. The oxidation degree was correlated to the flotation recovery, with a quantitative relationship (y = −298.81x + 213.05, y and x represent flotation recovery and oxidation degree, respectively, 0.388 ≤ x ≤ 0.618) being established, thereby giving a guideline to better manage chalcopyrite flotation by controlling its surface oxidation and SBX adsorption on chalcopyrite surfaces.

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“…A study on the impact of the process parameter modification was presented in [17,18]. The surface oxidation level was investigated in [19]. Furthermore, various attempts in the modeling of the whole process or parts of it, introducing different types of algorithms, were presented in many papers [20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Multidimensional Optimization of the Copper Flotation in a Jameson Cell by Means of Taxonomic Methods

et al. 2021

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Three factors were measured in the flotation process of copper ore: the copper grade in a concentrate (β), the copper grade in tailings (ϑ), and the recovery of copper in a concentrate (ε). The experiment was conducted by means of a Jameson cell. The factors influencing the quality of the process were the particle size (d), the flotation time (t), the type of collector (k), and the dosage of the collector (s). The considered vector function is then (β(d, t, k, s), ϑ(d, t, k, s), ε(d, t, k, s)). In this work, the optimization was based on determining the values of the adjustable factors (d, t, k, s). The goal was to obtain the possibly highest values of the functions β and ε (maximum) with the possibly lowest values of the function ϑ (minimum). To this end, taxonomic methods were applied. Thanks to the applied method, the optimum—with the adopted assumptions—was found. The presented methodology can be successfully applied in the search for the optima in a variety of technological processes.

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The critical degree of mineral surface oxidation in copper sulphide flotation

Cited by 34 publications

References 27 publications

X-ray Photoelectron Spectroscopy in Mineral Processing Studies

X-ray Photoelectron Spectroscopy in Mineral Processing Studies

A Quantitative Relationship between Oxidation Index and Chalcopyrite Flotation Recovery

Multidimensional Optimization of the Copper Flotation in a Jameson Cell by Means of Taxonomic Methods

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