Flotation separation of pyrite from arsenopyrite using sodium carbonate and sodium humate as depressants

Liu, Ruizeng; Li, Jialei; Wang, Yunwei; Liu, Dianwen

doi:10.1016/j.colsurfa.2020.124669

Cited by 31 publications

(8 citation statements)

References 17 publications

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“…As shown in Figure a, the ζ potential of chalcopyrite decreased from positively charged to negatively charged with pH increasing from 2.4 to 12.1 and the isoelectric point (IEP) was located at about 3.1, which was in line with the papers. , After mixing with SH, the ζ potential of chalcopyrite had a negative shift within the experimental pH range, suggesting that the negatively charged SH ions were adsorbed on the negatively charged chalcopyrite surface by overcoming the electrostatic repulsion . It should be noted that the shift (lower than 9.0 mV) was on a relatively small scale, suggesting that SH ions were weakly adsorbed on the chalcopyrite surface.…”

Section: Resultssupporting

confidence: 66%

Selective Separation of Chalcopyrite from Pyrite Using Sodium Humate: Flotation Behavior and Adsorption Mechanism

Sun,

Li,

et al. 2023

ACS Omega

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Flotation separation of chalcopyrite from pyrite using lime or cyanides as depressants results in serious problems, such as the blockage of pipelines and environmental pollution. Eco-friendly organics are a future trend for beneficiation plants. In this research, the eco-friendly organic depressant sodium humate (SH) was chosen as a depressant to separate chalcopyrite from pyrite by flotation. The results indicated that SH could selectively depress pyrite owing to the oxidation species (FeOOH, Fe2(SO4)3) on its surface. The oxidation species were the adsorption sites for the COO– in the SH structure and impeded the subsequent collector potassium ethyl xanthate (KEX) adsorption. However, chalcopyrite was slightly oxidized with fewer oxidation species for SH adsorption, and KEX could be adsorbed and functioned effectively. This research suggested that SH could be an effective and eco-friendly depressant in chalcopyrite–pyrite flotation separation, which had potential use in the industry.

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Section: Resultssupporting

confidence: 66%

Selective Separation of Chalcopyrite from Pyrite Using Sodium Humate: Flotation Behavior and Adsorption Mechanism

Sun,

Li,

et al. 2023

ACS Omega

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“…After 2 min flotation, the float and the sink products were collected and dried. Finally, the recovery rate was calculated based on the dry weight of the product [22]. The tests under the same conditions were conducted three times.…”

Section: Micro-flotation Testsmentioning

confidence: 99%

“…These processes result in shielding of the collector hydrophobic effect and cause the mineral to be hydrophilic and inhibited. Therefore, tannin [21], HA sodium (ammonium) [22], polyacrylamide [13], lignosulfonate [23], and organic macromolecular inhibitors have good applications in the removal of arsenopyrite.…”

Section: Introductionmentioning

confidence: 99%

Flotation Depression of Arsenopyrite Using Sodium Nitrobenzoate under Alkaline Conditions

Sun

Hu³

et al. 2021

Minerals

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Arsenopyrite is a common arsenic-containing mineral that is often closely associated with sulfide minerals, such as pyrite, chalcopyrite, pyrrhotite, galena, and sphalerite, and with precious metals, such as gold and silver. The selective inhibition of arsenopyrite is an important method used to reduce the arsenic content of processed products, the cost of arsenic removal in metallurgical processes, and its impact on the environment. In this study, we discovered a chemical sodium, m-nitrobenzoate (m-NBO), that can effectively inhibit the flotation behaviors of arsenopyrite via sodium butyl xanthate (NaBX), and these effects were studied by flotation experiments. The results showed that, using NaBX as a collector, arsenopyrite had good floatability under acidic conditions, but the floatability decreased under alkaline conditions. Furthermore, the organic inhibitor m-NBO had a significant inhibitory effect on arsenopyrite under alkaline conditions. In addition, the adsorption between m-NBO and NaBX was competitive, and a hydrophilic layer formed on the surface of arsenopyrite. The passivation film prevents dixanthogen from being adsorbed on the surface of the mineral. Due to the effect of m-NBO on arsenopyrite, the redox potential and oxide content of the arsenopyrite surface increased, the hydrophobicity of the arsenopyrite surface was reduced, and the flotation of arsenopyrite was inhibited. These results provide options for separating multimetal sulfide minerals and arsenic-containing minerals.

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“…This implied that TA possessed stronger adsorption toward pyrite than chalcopyrite . Moreover, the decreased values at acidic pH were lower than those at natural and alkaline pH, indicating that TA adsorption was less pronounced at acidic pH and had a weak affinity with pyrite . This may result from the dissolution of oxidized products at strong acidic pH which eliminated the adsorption sites of TA…”

Section: Resultsmentioning

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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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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Flotation separation of pyrite from arsenopyrite using sodium carbonate and sodium humate as depressants

Cited by 31 publications

References 17 publications

Selective Separation of Chalcopyrite from Pyrite Using Sodium Humate: Flotation Behavior and Adsorption Mechanism

Selective Separation of Chalcopyrite from Pyrite Using Sodium Humate: Flotation Behavior and Adsorption Mechanism

Flotation Depression of Arsenopyrite Using Sodium Nitrobenzoate under Alkaline Conditions

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

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