Reverse flotation separation of talc from molybdenite without addition of depressant: Effect of surface oxidation by thermal pre-treatment

Pullulan Polysaccharide as an Eco-Friendly Depressant for Flotation Separation of Chalcopyrite and Molybdenite

“…The band at 557 cm –1 belongs to the symmetrical stretching peak of Mo–O–Mo. 27 , 28 In the PU-treated molybdenite spectrum, the peak at 1630 cm –1 moved to 1633 cm –1 , which was obviously the O–C=O peak of PU, the −OH peak at 3457 cm –1 shifted to 3450 cm –1 , belonging to the −OH peak of PU, and the peak at 1021 cm –1 shifted to 1024 cm –1 representing the stretching vibration of C–O–C in PU. In the infrared spectrum of molybdenite, the characteristic peaks of PU appeared, while the bands at 1630 and 1021 cm –1 of molybdenite disappeared.…”

Selective flotation separation of chalcopyrite and sphalerite by thermal pretreatment under air atmosphere

“…5, the surface chemical states of chalcopyrite significantly change after thermal pretreatment. When the chalcopyrite is calcined, the peak strength of CuO, Fe2O3, and SO4 2-increases significantly, and the peaks shift to relatively higher binding energy due to the higher electronegativity of oxygen than sulfur (Tang et al, 2020). Additionally, the new peaks of SO4 2-appear at 168.68 and 16.83 eV, which indicates that the chalcopyrite surface underwent dramatical oxidation after thermal treat- When the pulp of chalcopyrite thermal-treated was adjusted by NaOH, the peak strengths of CuO and (SO4 2-)-2 decrease due to the dissolution of CuO and sulfate.…”

Comparison and Mechanism Analysis of Three-Phase Contact Formation onto Hydrophilic/Hydrophobic Mineral Surfaces in the Presence of Cationic/Anionic Surfactants during Flotation Process

“…Longhua Xu [16] found that the combined collector of cationic dodecylamine (DDA) and anionic sodium oleate (NaOL) could improve the muscovite flotation recovery, compared with their single collectors. However, in the case of natural hydrophobic talc, it is floated without any collector, making it usually depressed in reverse flotation [19][20][21]. Carboxymethyl cellulose (CMC) has been confirmed as an effective depressant for talc floatability and is favorable to its separation from chalcopyrite [22].…”