Reverse flotation of iron ore using amphoteric surfactant: 2-((2-(decyloxy)ethyl)amino)lauric acid
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College of Resource and Civil Engineering, Northeastern University, Shenyang 110819, PR China
State Key Laboratory of Mineral Processing, Beijing 100160, PR China
BGRIMM Technology Group, Beijing 100160, PR China
Binbin Luo   

College of Resource and Civil Engineering, Northeastern University, Shenyang 110819, PR China
Publication date: 2021-04-06
Physicochem. Probl. Miner. Process. 2021;57(3):73–83
2-((2-(decyloxy)ethyl)amino)lauric acid (C10H21CH(NH(CH2)3OC10H21)COOH, LDEA), a novel amphoteric surfactant, has been first utilized as the collector for on-site the reverse flotation of Anqian mixed magnetic concentrates. The separation performances were investigated systematically by flotation condition experiments, open-circuit flowsheet experiment, and locked cycle flowsheet experiment. The flotation condition results showed that the optimal roughing conditions were pulp pH 10.0, starch dosage 1000.0 g/t, and collector LDEA dosage 500.0 g/t at 25 °C. Under the optimized flotation conditions, through one roughing - three scavengings locked cycle flowsheet, the iron concentrate with total iron (TFe) grade of 68.08% and TFe recovery of 88.20% was obtained, while the TFe grade of the tailings was only 12.32%. Compared with the flotation results of anionic commercial surfactant RA-715 used as the collector, the collector LDEA has a better separation performance that TFe grade and recovery increased 0.07% and 0.86% in the iron concentrate and TFe grade of the tailings decreased 3.72%, respectively. Besides, the collector LDEA possesses more advantages, such as a simple flotation process, no activator CaO addition, lower collector consumption, and lower pulp temperature. The study revealed that the novel amphoteric surfactant LDEA was an effective flotation collector with good collecting and separation ability on natural iron ores at a comparatively lower temperature.