Selective flotation of siderite and quartz from a carbonate-containing refractory iron ore using a novel amino-acid-based collector
Yimin Zhu 1,2
Yanjun Li 1,3
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College of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
2011 Collaborative Innovation Centre of Steel Technology, Northeastern University, Shenyang 110819, China
Liaoning Technology and Engineering Laboratory of Effective Exploitation of Refractory Iron Ores, Shenyang 110819, China
Corresponding author
Xiaotian Gu   

College of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China, College of Resource and Civil Engineering, Northeastern University, 110819 Shenyang, China
Physicochem. Probl. Miner. Process. 2018;54(3):803-813
A novel and highly-efficient amino-acid-based collector, α-ethylenediamine lauric acid (α-EDA-LA), was studied to selectively beneficiate carbonate-containing refractory hematite ores. Single mineral and synthetic mixture flotation tests were carried out to investigate its floating performance. Zeta potential, fourier transform infrared spectroscopy (FTIR) and Density Functional Theory-based molecular simulation were used to identify the adsorption mechanism. The flotation results showed that quartz could be collected effectively at pH 11.0-12.0 in the reverse flotation. For siderite, the recovery peaked at 83.4% at pH 8.0, where siderite presented different floatability from magnetite and hematite. Exploiting such difference, the separation of siderite could be achieved. Zeta-potential measurements showed that α-EDA-LA adsorption on the surfaces of siderite and quartz decreased the corresponding zeta potentials at pH of 8.0-10.0 and 8.0-12.0, respectively. This means the adsorption overcome the electrostatic repulsion between α-EDA-LA and the mineral surfaces. The molecular simulation indicated that no chemisorption took place between α-EDA-LA and quartz. FTIR analysis suggested that α-EDA-LA was adsorbed on quartz via hydrogen bonding. The adsorption of α-EDA-LA on siderite surface was dominated by chemisorption, while further enhanced by hydrogen bonding. This study filled the gap in the research on siderite flotation reagents and its adsorption mechanism.
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