Selective flotation of scheelite from calcium minerals with sodium oleate as a collector and phosphates as modifiers. II. The mechanism of the interaction between phosphate modifiers and minerals |
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| Authors: | Li Changgen Lü Yongxin |
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| Institution: | Beijing Institute of Mining and Metallurgy, Beijing China |
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| Abstract: | The respective effects of phosphate modifiers on the solubility of calcium minerals in water, on the surface charge of the minerals and on the adsorption of the phosphates and of sodium oleate on the mineral surface were examined. The Auger spectra and the infrared spectra of the minerals treated with these reagents were also investigated. The ability of the phosphates to complex metal ions was determined by nephelometric titration. The structures of the minerals and their effects on their floatability, as well as structures of the phosphates and their effects on the complexation power were discussed. A mechanism of depression of the calcium minerals through the selective complexing dissolution of calcium ions from the mineral surface was derived and explains the higher selectivity obtained in scheelite flotation when (NaPO3)6 or Na4P2O7 are used as modifiers. |
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