The Flotation of Kyanite and Sillimanite with Sodium Oleate as the Collector

Abstract

Kyanite and sillimanite are two polymorphic minerals with the same formula of Al 2 SiO 5 , but different crystal structures. Despite their high economic values, selectively recovering them by flotation is a challenge. In this study, the flotation behaviors of the two minerals with sodium oleate as the collector were examined at different pH conditions. Zeta potential measurement, infrared spectroscopic measurement, chemical speciation and X-ray photoelectron spectroscopy measurement were conducted to identify the underpinning mechanisms. It is found that the flotation behavior of both minerals is different under the same flotation condition. The flotation recovery of sillimanite is much higher than that of kyanite in the presence of the collector sodium oleate. Sodium oleate adsorbs onto the surfaces of kyanite and sillimanite mainly through the chemical interaction of the ionic-molecular dimers with aluminum atoms at pH 8.0. The higher sillimanite flotation recovery between the two minerals is related to the higher electrostatic charge densities of the aluminum atoms in six-fold coordination, which leads to the higher collector adsorption.

Aluminosilicate‐epoxy resin composite as novel material for electrical insulation with enhanced mechanical properties and improved thermal conductivity

“…. Most of the bands at positions below 1,034 cm −1 are typical for kyanite , while the rest of them can be probably attributed to the silanization process. It is worth to notice that the bands above 1,034 cm −1 in all cases are similarly placed, what can indicate that 1360–007 SST is covered with the similar type of the epoxy silane as the other aluminosilicates.…”

Effect of Sodium Oleate Surfactant Concentration Grafted onto SiO2Nanoparticles in Polymer Flooding Processes

“…Bands at 2881 and 2834 cm –1 are associated with vibrations of C–H, and bands at 746 and 729 cm –1 are characteristic of hydroxyl groups and stretching and deformation of −CH 2 . 34−37…”

The Effects of Calcium Ions on the Flotation of Sillimanite Using Dodecylammonium Chloride

“…In the presence of Ca 2+ ions, the PZC of sillimanite showed a slight change, which shifted to 6.1. This behavior of zeta potential suggests that the Ca 2+ ions are being adsorbed on the sillimanite surface [6,13,15,35]. …”