A mixed collector system for phosphate flotation

Abstract

a b s t r a c tFlotation has been used in industry for more than a half century as the primary technique for upgrading phosphate. While the flotation of phosphate was inefficient when oleic acid was used alone as a collector, therefore a mixed collector of oleic acid (HOl), linoleic acid (LA) and linolenic acid (LNA) was employed to improve the recovery of phosphate flotation. The batch flotation results showed that the optimal composition of the mixed collector was 54 wt.% HOl, 36 wt.% LA and 10 wt.% LNA. Additionally, the effect of pH on the mixed collector application was studied while considering the surface tension, contact angle and micro-flotation. The results showed that the mixed collector should be used at a pH of 9.5. Above a pH of 9.5, the adsorption of fatty acids dimers on the apatite surface hindered phosphate flotation. The influence of the mixed collector assembly on apatite flotation was also investigated. It was demonstrated that due to its low critical micelle concentration, a sufficiently hydrophobic apatite surface could be generated at a collector concentration of 60 mg/L. In addition, zeta potential experiments suggested that collector adsorption was governed by chemisorption. FTIR and XPS spectra studies further indicated that the chemical reaction involved the carboxyl groups of fatty acids and Ca species at the apatite surface for each fatty acid in the mixed collector.

Application and Mechanism of Anionic Collector Sodium Dodecyl Sulfate (SDS) in Phosphate Beneficiation

“…Chinese collophane is characterized by fine grain and close association with gangue minerals, making it particularly challenging to separate [15]. The gangue minerals can be roughly divided into two categories: silicate minerals and carbonate minerals [16][17][18]. The direct-reverse flotation process, in which the siliceous minerals are discharged by direct flotation while the calcareous minerals are discharged by reverse flotation, is a popular approach to separation [19,20] but one that comes with several drawbacks, including high reagent consumption, high flotation temperature, and severe environmental pollution.…”

Separation Mechanism of Fatty Acids from Waste Cooking Oil and Its Flotation Performance in Iron Ore Desiliconization

“…As shown in the infrared spectrum of UFA (Figure 7), the characteristic peaks at positions of 2922, 2855 and 1464 cm −1 assigned to asymmetric stretching of -CH 3 group, symmetric stretching and scissoring of -CH 2 group [30,36]. The characteristic sharp band at 1709 cm −1 was due to the asymmetric stretching of -C=O in the carboxyl group [37]. The absorption peak at 724 cm −1 belonged to C-H bending vibration of the methylene chain -(CH 2 ) n -.…”

Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

“…Phosphorous, as one of the most common elements on earth and essential elements in organisms, is widely used in the production of fertilizers, detergents, pharmaceuticals, fluxes, cement, and many other industrial processes [1][2][3][4][5]. Nevertheless, with the rapid development of China's economy, the production of phosphorous cannot meet the requirement of the country [6].…”