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2. Effects of Sodium Alginate on the Flotation Separation of Molybdenite From Chalcopyrite Using Kerosene as Collector

Author

Guangsheng Zeng, Leming Ou, Wencai Zhang, and Yuteng Zhu

Subjects
molybdenite, chalcopyrite, sodium alginate, Cu2+-activation, flotation, Chemistry, QD1-999
Abstract

In this paper, the effect of sodium alginate (SA) on the flotation separation of molybdenite (MoS2) from chalcopyrite using kerosene as collector was systematically investigated. The results of single-mineral micro-flotation tests indicated that SA exhibited strong depression on chalcopyrite flotation while it imposed no impact on the floatability of molybdenite. However, in the chalcopyrite–molybdenite mixed-mineral flotation system, the presence of chalcopyrite significantly increased the depressing effect of SA on molybdenite flotation, leading to a considerable reduction in the flotation selectivity. The negative impact of chalcopyrite on the performance of SA in molybdenite flotation was eliminated by adding a certain dosage of kerosene prior to SA. A concentrate containing 53.43% of molybdenum (Mo) was obtained at 76.90% of recovery using 19 mg/L kerosene and 40 mg/L SA at pH 5.4. Zeta potential measurements indicated that the adsorption of SA on chalcopyrite surfaces was stronger than that on molybdenite surfaces, which agreed with the single-mineral flotation test results. The adsorption of SA on chalcopyrite was further confirmed to be chemisorption by Fourier-transform infrared spectroscopy (FTIR) spectra analyses. When Cu2+ appeared in solution, the flotation of molybdenite was strongly depressed by SA. Mechanism analyses indicated that more active sites were generated on molybdenite surfaces after the addition of Cu2+, thus promoting the adsorption of SA.

Published
2020
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3. Frontiers in Chemistry

Author

Feng Rao, Shenxu Bao, Wencai Zhang, and Hong Peng

Subjects
hydrometallurgy, Aqueous solution, Hydrometallurgy, editorial, Chemistry, Capacitive deionization, removal, capacitive deionization, Inorganic chemistry, Extraction (chemistry), General Chemistry, Inorganic ions, separation and recovery, extraction, QD1-999
Abstract

Published version

Published
2021

4. Frontiers in Chemistry

Author

Wencai Zhang, Guangsheng Zeng, Yuteng Zhu, and Leming Ou

Subjects
IONS, PROCESS WATER, ADSORPTION, Chemistry, Multidisciplinary, chemistry.chemical_element, flotation, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, CALCIUM, sodium alginate, lcsh:Chemistry, SELECTIVE FLOTATION, Adsorption, molybdenite, SULFIDE, Zeta potential, PART II, CHITOSAN, PYRITE, Original Research, Kerosene, CASSITERITE, Chalcopyrite, Cu2+-activation, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chalcopyrite, Chemistry, chemistry, lcsh:QD1-999, Molybdenum, Chemisorption, Molybdenite, visual_art, visual_art.visual_art_medium, 0210 nano-technology, Selectivity, Nuclear chemistry
Abstract

In this paper, the effect of sodium alginate (SA) on the flotation separation of molybdenite (MoS2) from chalcopyrite using kerosene as collector was systematically investigated. The results of single-mineral micro-flotation tests indicated that SA exhibited strong depression on chalcopyrite flotation while it imposed no impact on the floatability of molybdenite. However, in the chalcopyrite–molybdenite mixed-mineral flotation system, the presence of chalcopyrite significantly increased the depressing effect of SA on molybdenite flotation, leading to a considerable reduction in the flotation selectivity. The negative impact of chalcopyrite on the performance of SA in molybdenite flotation was eliminated by adding a certain dosage of kerosene prior to SA. A concentrate containing 53.43% of molybdenum (Mo) was obtained at 76.90% of recovery using 19 mg/L kerosene and 40 mg/L SA at pH 5.4. Zeta potential measurements indicated that the adsorption of SA on chalcopyrite surfaces was stronger than that on molybdenite surfaces, which agreed with the single-mineral flotation test results. The adsorption of SA on chalcopyrite was further confirmed to be chemisorption by Fourier-transform infrared spectroscopy (FTIR) spectra analyses. When Cu2+ appeared in solution, the flotation of molybdenite was strongly depressed by SA. Mechanism analyses indicated that more active sites were generated on molybdenite surfaces after the addition of Cu2+, thus promoting the adsorption of SA. Published version

Published
2020

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