Separation mechanism of chalcopyrite and pyrite due to H2O2 treatment in low-alkaline seawater flotation system

Yang, Xu; Li, Yubiao; Fan, Rong; Duan, Wanqing; Huang, Lingyun; Xiao, Qing

doi:10.1016/j.mineng.2021.107356

Cited by 25 publications

(12 citation statements)

References 54 publications

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“…Figure shows the O 1s on chalcopyrite and pyrite before and after treatment with TA. Before treatment, as depicted in Figure a, the 530.33 and 531.75 eV peaks were ascribed to H 2 O and O 2 , respectively, which may be adsorbed from the air during testing. , The peak at 533.15 eV was attributed to OOH/SO 4 2– , which originated from the oxidation of chalcopyrite . When TA interacted with chalcopyrite, the peaks of H 2 O, O 2 , and OOH/SO 4 2– appeared at 530.47, 533.70, and 533.05 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Utilization and Mechanisms of Tannic Acid as a Depressant for Chalcopyrite and Pyrite Separation

Sun

Zhang

et al. 2023

ACS Omega

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Current flotation practices using lime or cyanide as depressants in chalcopyrite and pyrite separation have significant disadvantages, such as substantial reagent consumption, high slurry pH, and environmental hazards. This work aimed to explore the utilization and mechanisms of tannic acid (TA) as an eco-friendly alternative to lime or cyanide in chalcopyrite–pyrite separation. Flotation results showed that TA selectively depressed pyrite yet allowed chalcopyrite to float at neutral or alkaline pH. Adsorption density and zeta potential results indicated that TA adsorbed intensely on pyrite but minorly on chalcopyrite. Besides, potassium ethyl xanthate was still largely adsorbed on chalcopyrite but not on pyrite after TA adsorption. Surface analysis by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy further showed that the oxidation species of FeOOH and Fe2 (SO4)3, particularly FeOOH were the main active sites for TA chemical adsorption. Owing to the greater and faster oxidation of pyrite, more FeOOH and Fe2 (SO4)3 were generated on the pyrite surface, and the chemical adsorption of TA was more pronounced on the pyrite surface than on the chalcopyrite surface.

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Section: Resultsmentioning

confidence: 99%

“…In natural deposits, chalcopyrite often grows together with other sulfide minerals, particularly pyrite (FeS 2 ). In the beneficiation process of chalcopyrite, it is crucial to separate pyrite from chalcopyrite to obtain a high-grade copper concentrate . Flotation is the dominant method for separating these two sulfide minerals.…”

Section: Introductionmentioning

confidence: 99%

Utilization and Mechanisms of Tannic Acid as a Depressant for Chalcopyrite and Pyrite Separation

Sun

Zhang

et al. 2023

ACS Omega

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“…The concentrations of H 2 O 2 were 0.06, 0.1, 0.14 and 1 vol.% (v/v). The XPS survey spectra were collected with a pass energy of 100 eV and a step size of 1.0 eV from 1350 to 0 eV [10] while the high-resolution XPS spectra were collected with a dwell time of 0.1 s and 5 sweeps, with a step size of 0.1 eV and a pass energy of 30 eV [17]. The Avantage 5.9 software was used for data analysis.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

“…In addition, the surface oxidation of chalcopyrite is significantly increased in pulp containing various ions, especially in seawater. For instance, Yang et al [10] reported that the recovery (58%) of chalcopyrite oxidized with 0.1 vol.% H 2 O 2 in seawater was 37% lower than that (95%) in pure water due to the greater oxidation of chalcopyrite in seawater. Based on these findings, many researchers [7,11,12] have attempted to enhance the separation selectivity of chalcopyrite via applying surface oxidation treatments, such as plasma and the addition of oxidants.…”

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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“…H2O2 could oxidize pyrite in the wide pH of 5-11 (Forson et al, 2021;Khoso et al, 2019a). This oxidant could also be used in the special flotation of pyrite using seawater (Yang et al, 2022). H2O2 is also generated on the pyrite surface during the wet grinding of pyrite (Javadi Nooshabadi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

New insights into pyrite-hydrogen peroxide interactions during froth flotation: experimental and DFT study

Cao¹,

Yan²,

Liu³

et al. 2022

Physicochem. Probl. Miner. Process.

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Hydrogen peroxide (H2O2) is an efficient depressant for pyrite (FeS2) flotation. However, the depressing mechanism of H2O2 is not fully understood. In this paper, the depressing capacity of H2O2 for pyrite was examined by flotation tests. Results revealed that pyrite flotation could be inhibited by H2O2 at pH 6.4. The pyrite powder in H2O2 solution enhanced the release of O2 from H2O2. However, the O2 concentration in the solution was less than that of H2O2; thus, H2O2 is the major oxidant in the solution. Moreover, density functional theory calculations were performed to study the interactions between H2O2 and hydrated pyrite (100) surface. The H2O2 molecule tended to react with the pyrite surface to generate one S=O bond and an H2O molecule. The possible binding models of O2 molecules on the pyrite (100) surface were also studied for comparison. The O2 dissociation on the pyrite surface was more favorable than the adsorption of O2 as a whole. In addition, the orbital interaction in the S=O bond raised from the reaction of H2O2/O2 with the pyrite surface was also investigated by the density states analysis. These results provide some insights into the oxidizing effect of H2O2 in pyrite flotation.

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Separation mechanism of chalcopyrite and pyrite due to H2O2 treatment in low-alkaline seawater flotation system

Cited by 25 publications

References 54 publications

Utilization and Mechanisms of Tannic Acid as a Depressant for Chalcopyrite and Pyrite Separation

Utilization and Mechanisms of Tannic Acid as a Depressant for Chalcopyrite and Pyrite Separation

A Quantitative Relationship between Oxidation Index and Chalcopyrite Flotation Recovery

New insights into pyrite-hydrogen peroxide interactions during froth flotation: experimental and DFT study

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