Interfacial Behavior of Anionic/Cationic Flotation Collectors in Mixed Aqueous Solutions and Their Effect on Flotation Recovery of Quartz

Abstract

In this study, the effects of anionic/cationic collector mixtures on surface tension (γ) were investigated as a function of pH using the pendant drop method. For the tests, long‐chain tallow amine and petroleum sulfonate, which are the most common anionic and cationic flotation collectors, were used individually and as binary mixtures with different mixing ratios. The results show that pH of the solution had crucial effects on surface tension values of the amine whose species distribution varied with pH but not on petroleum sulfonate that is found in the ionized form over the entire pH range. In the case of binary anionic/cationic collector mixtures, the minimum surface tension values were obtained under highly acidic pH conditions with a mixing ratio of 1:3, while the collector mixtures with 3:1 and 1:1 mixing ratios displayed similar surface tension values at all pH values. For all binary‐collector mixtures with different mixing ratios, the surface tension values were found to be higher than those of single‐collector solutions with equal collector concentrations. In the case of microflotation tests, the flotation recoveries of quartz in the presence of the binary anionic/cationic collector mixtures dropped more than 25% when compared with the results in the presence of single‐collector solutions having equal collector concentrations.

A Novel Process to Recover Gypsum from Phosphogypsum

“…Sodium silicate can be selectively adsorbed onto the surface of gangue minerals, this results in an increase in the hydrophilicity of gangue minerals and changes to the surface electrical properties of gangue minerals. Thus, the gangue minerals and gypsum surfaces are negative, increasing the electrostatic repulsion between gypsum and gangue minerals, reducing the agglomeration of mineral particles, and improving the dispersion of the flotation system [ 21 , 22 , 23 ]. An increase in the dosage of sodium silicate improved the quality of the concentrate; however, when the dosage of sodium silicate exceeded 400 g/t, the purity of CaSO 4 ·2H 2 O and the whiteness of the concentrate decreased, and the recovery of CaSO 4 ·2H 2 O increased to a certain extent.…”

Application and Mechanism of Mixed Anionic/Cationic Collectors on Reverse Flotation of Hematite

“…In recent years, through a large number of studies on iron ore reverse flotation technology, it has been found that research on flotation reagents, especially high-efficiency collectors, is still key to improving flotation efficiency. Some novel collecting agents exhibit excellent selectivity, but are challenging and costly to synthesize, while the use of a mixed collector not only minimizes reagent consumption and production costs but also addresses the shortcomings associated with using a single reagent, thereby further boosting flotation efficiency [14][15][16]. For example, Yang et al [17] found that the mixed collector of sodium oleate-benzohydroxamic acid (NaOL-BHA), at a molar ratio of 4:1, exhibited excellent performance in the flotation separation of ilmenite from titanaugite.…”