Degradation mechanism of surface hydrophobicity by ferrous ions in the sulfidization flotation system of smithsonite
2022
Feng, Qicheng | Zhao, Guanghu | Zhang, Ga | Zhao, Wenjuan | Han, Guang
Metal ions commonly exist in the flotation pulp, which will affect the mineral surface properties and lead to a change in the mineral floatability. In this work, the effect of Fe²⁺ on the flotation behavior of smithsonite was investigated, and the interaction mechanism of Fe²⁺ with the smithsonite surface in the sulfidization flotation system was clarified. The results of microflotation tests showed that the presence of Fe²⁺ can greatly reduce the flotation recovery of smithsonite. The results of zeta-potential measurement, time-of-flight secondary-ion mass spectrometry, and X-ray photoelectron spectroscopy indicated that addition of Fe²⁺ before sulfidization generated FeOOH species and hindered formation of active sulfide species on smithsonite. The results of infrared spectroscopy and contact-angle measurement showed that addition of Fe²⁺ was harmful for adsorption of the collector on smithsonite, and it was difficult to obtain hydrophobic smithsonite surfaces in the Fe²⁺–sulfidization–xanthate flotation system. Considering the above results, the presence of Fe²⁺ depressed adsorption of sulfide ions and the collector on smithsonite, making smithsonite show poor floatability, and it was difficult to obtain the ideal flotation recovery of smithsonite.
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