Synergistic Adsorption and Flotation of New Mixed Cationic/Nonionic Collectors on Muscovite

Abstract

Abstract:The mixed cationic collector cetyltrimethylammonium chloride (CTAC) and nonionic collector octanol (OCT) was found to exhibit a synergistic effect on the flotation and adsorption of muscovite. To understand the underlying synergistic mechanism, flotation, contact angle, surface tension, and adsorption measurements were carried out. The results obtained from flotation measurements indicated that the mixed CTAC/OCT exhibits a better collecting ability than CTAC or OCT. The recovery of muscovite with CTAC only rapidly decreased from 97.25% at pH 2.64 to 75.26% at pH 5.82, followed by a flat horizontal at a pH is higher than 6. In contrast, a high recovery of greater than 85% muscovite was observed using mixed CTAC/OCT at α CTAC = 0.67 (the mole ratio of CTAC:OCT = 2:1) over the investigated pH range. From the surface activity parameters (CMC, γ CMC , Γ max , A min ) estimated from surface measurements and interaction parameters (β m , β σ ), in addition to the micellar and interfacial compositions (x m 1 , x σ 1 ) obtained from the theory of regular solutions, a synergistic effect is evident in the mixed micelle and at the water/air interface. Moreover, the mixed CTAC/OCT at α CTAC = 0.67 exhibited the maximum synergistic interaction. The results obtained from surface tension measurements indicated that the mixed CTAC/OCT exhibits considerably higher surface activities compared to single CTAC or OCT. The contact angle results confirmed that the mixed CTAC/OCT is a better collector than the individual CTAC or OCT for the flotation of muscovite. According to the results obtained from adsorption experiments, compared with that of individual CTAC or OCT, the amounts of CTAC and OCT adsorbed on the muscovite surface are considerably increase in the mixed systems because of co-adsorption. Based on these results, the mixed CTAC/OCT exhibits a remarkable synergistic effect during the flotation and adsorption of muscovite.

The use of pracaxi oil collector in the selective flotation of xenotime from silicates

“…This phenomenon could explain the high flotability observed for xenotime even at concentrations as low as those of hemi-micelle formation. The synergistic effect is reported in several studies with different types of collectors (anionic, cationic and non-ionic) and for different types of ores (sulfide, coal and silicate) [ [41] , [42] , [43] ]. The best efficiency in the use of reagent mixtures is attributed to the decrease in CMC and surface tension [ 20 ].…”

Interpretation of Hydrophobization Behavior of Dodecylamine on Muscovite and Talc Surface through Dynamic Wettability and AFM Analysis

“…Each experimental curve (symbol) was fitted with a DLVO model (corresponding solid lines). As shown in Figure 9a, the monotonic repulsion was observed in ultrapure water for the whole range of studied forces due to negative charge on muscovite surface [13,36]. Differing from the crystal structure of muscovite, the chemical composition of tetrahedral talc is relatively stable and the amount of its isomorphism is less, accounting for only few negative charges on talc surface and weaker electrostatic interaction in water, as shown in Figure 9b.…”

Influence of Different Types of Surfactants on the Flotation of Natural Quartz by Dodecylamine

“…Therefore, with the same amount of reagents, the stronger the surface activity, the more bubbles are generated, and the greater the probability of collision and adhesion between mineral particles and bubbles, thus achieving higher flotation recovery [33]. For amine collectors, combined reagents with other surfactants usually exhibit higher surface activity [34]. To investigate the effect of the combination of surfactants on the surface tension of the system, surface tension measurements were conducted under the conditions of pH 10.1, collector concentration of 8 × 10 −4 mol/L, and molar contents of OCT, SDS, and CTAB at 25%, 25%, and 20%, respectively.…”