Abstract
Aggregation behaviors of kaolinite particles with different surfactants were studied in this paper. Aggregation settling yield and fractal dimension analysis were used to determine the aggregation results. Zeta potential measurements, adsorption tests, Infrared spectroscopy analysis and scanning electron microscope measurements were conducted for further investigation into the mechanism. Experimental results showed that much better aggregation results was obtained in the presence of cationic surfactant than that in the presence of anionic and non-ionic surfactants. 98% aggregation setting yield was obtained in the presence of dodecylamine. Adsorption tests indicated that the adsorption capacity of dodecylamine on kaolinite surface was larger than that of sodium oleate and Tween80. Zeta potential measurements confirmed that dodecylamine was more beneficial to the aggregation of kaolinite particles. Infrared spectroscopy analysis revealed that the adsorption of dodecylamine on kaolinite surface was attributed to electrostatic and hydrogen-bonding interactions. Sodium oleate was adsorbed by chemical adsorption. However, Tween80 can hardly be adsorbed by kaolinite surface.
Highlights
The efficient treatments of fine tailings and waste water are easy to be underestimated in mineral processing process [1]
When the concentration of sodium oleate (SO) and Tween80 were more than 1.0×10-3 mol/dm3 and 1.6×10-3 mol/dm3, respectively, the settling yield of kaolinite decreased with the increase of the surfactant concentration
The settling yield of kaolinite particles was more than 98%, and the fractal dimension of the flocs was up to 1.70 in the presence of DDA
Summary
The efficient treatments of fine tailings and waste water are easy to be underestimated in mineral processing process [1]. Tailings are inevitable by-product in the process of mineral mining and preparation. Slime water of tailings results in high solids concentrations and degradation of the coal washing circuit, which poses a severe challenge to the entire production process [2]. The presence of the fine and ultrafine particles in the raw material causes the difficulty of separation, the loss of valuable components and ecological contamination [5]. Kaolinite is the main mineral component of clay deposits and a typical layered silicate mineral [6].
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