Qicheng Feng

Research Field

Sulfide hemimorphite can be depressed by Fe3+ during flotation. In this study, the depression mechanism was studied by microflotation, inductively-coupled plasma mass spectrometry, local electrochemical impedance spectroscopy (LEIS), and X-ray photoelectron spectroscopy (XPS). Flotation test results suggested that sulfated hemimorphite can be depressed by Fe3+ across the entire pH range. LEIS, adsorption analysis, and XPS indicated that S species were adsorbed on hemimorphite as ZnS. The sulfide film was attenuated and no adsorbed Fe species were found after treatment with Fe3+. The results indicate that Fe3+ reacts with the ZnS film, which decreases the number S species, and this leads to hemimorphite depression.

10.3390/min10090790

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Citations (2)

Enhancement of salicylhydroxamic acid adsorption by Pb(II) modified hemimorphite surfaces and its effect on floatability

Minerals Engineering (2020)

Wenjuan Zhao Dianwen Liu Qicheng Feng

Surface Modification

Salicylhydroxamic acid

Zeta potential

10.1016/j.mineng.2020.106373

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Citations (57)

Surface characterization of azurite modified with sodium sulfide and its response to flotation mechanism

Separation and Purification Technology (2020)

Qian Zhang Shuming Wen Qicheng Feng Song Zhang

Zeta potential

Malachite

Xanthate

10.1016/j.seppur.2020.116760

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Citations (54)

A novel sulfidization system for enhancing hemimorphite flotation through Cu/Pb binary metal ions

International Journal of Mining Science and Technology (2024)

Qicheng Feng Yingchao Zhang Ga Zhang Guang Han Wenjuan Zhao

10.1016/j.ijmst.2024.11.008

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Citations (3)

Sulfidization regulation of cuprite by pre-oxidation using sodium hypochlorite as an oxidant

International Journal of Mining Science and Technology (2021)

Guang Han Shuming Wen Han Wang Qicheng Feng

The direct sulfidization of cuprite is inefficient because cuprite is a copper-oxide mineral with a strong surface hydrophilicity. In this study, oxidant was used to modify cuprite surfaces to regulate the sulfidization of cuprite. Microflotation tests showed that the flotation recovery of pre-oxidized cuprite was nearly 25% higher than that of direct sulfidization flotation, which indicates that the cuprite surface activity was enhanced after pre-oxidation by Cu(I) species (weak affinity with sulfur ions) transformation to Cu(II) species (strong affinity with sulfur ions). Zeta potential, scanning electron microscopy-energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry results showed that pre-oxidation improved cuprite sulfidization and promoted the formation of copper-sulfide species on the cuprite surfaces. The mineral surface stability and thus, xanthate species adsorption on the cuprite surfaces were improved. The surface-adsorption measurements and infrared spectroscopy showed that a large amount of xanthate species was adsorbed onto the sulfidized cuprite surfaces after pre-oxidation, which enhanced the cuprite hydrophobicity and improved the cuprite flotation.

Cuprite

Xanthate

Hexamethylenediamine

Covellite

10.1016/j.ijmst.2021.11.001

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Citations (59)

Activation mechanism of lead ions in the flotation of sulfidized azurite with xanthate as collector

Minerals Engineering (2021)

Qian Zhang Shuming Wen Qicheng Feng Yuebing Liu

Xanthate

Zeta potential