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The flotation behavior and adsorption mechanisms of 2-((2-(decyloxy)ethyl)amino)lauric acid on quartz surface

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Abstract A novel surfactant 2-((2-(decyloxy)ethyl)amino)lauric acid (LDEA) – substituting 3-(decyloxy)propan-1-amine (DPA) on the α-carbon position of lauric acid was firstly synthesized and utilized as a collector for the flotation of… Click to show full abstract

Abstract A novel surfactant 2-((2-(decyloxy)ethyl)amino)lauric acid (LDEA) – substituting 3-(decyloxy)propan-1-amine (DPA) on the α-carbon position of lauric acid was firstly synthesized and utilized as a collector for the flotation of quartz mineral at a relatively low temperature. The flotation performances and adsorption mechanisms of LDEA collector on quartz mineral surface were investigated by zeta potential measurements, Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS), in conjunction with the results of quartz micro-flotation tests. The flotation results showed that LDEA exhibited an excellent collecting performance on quartz mineral at a wide pulp pH range (about 6–11) with a low collector concentration 15.0 mg/L at a relatively low temperature 15 °C, where above 95.0% of the quartz mineral could be floated. Zeta potential measurements, FT-IR spectra, and XPS analyses reveal that the LDEA collector could be adsorbed on the surface of pure quartz in the forms of electrostatic and hydrogen bonding interactions at pulp pH 10.0.

Keywords: lauric acid; flotation; ethyl amino; decyloxy ethyl; spectroscopy

Journal Title: Minerals Engineering
Year Published: 2018

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