Efficient coal concentration using a short-chain amine-type compound as collector reagent: Flotation and optimization studies

Vilasó-Cadre, Javier E.; Ávila-Márquez, Delia M.; Reyes-Domínguez, Iván A.; Blanco-Flores, Alien ; Toledo-Jaldin, H. Paola; Gutiérrez-Castañeda, Emmanuel J.; Aguilar-Carrillo de Albornoz, Javier


This work presents the flotation of a sub-bituminous coal using 1-butylamine as a short-chain amine collector. The flotation results have been obtained with 1-butylamine (coal yield: 100%) and compared with those achieved with a quaternary amine (coal yield: 95.4%), kerosene (coal yield: 100%) and diesel (coal yield: 95.7%). The best results have been obtained with 1-butylamine. Less depressant effect has been observed with 1-butylamine. The FTIR signals have been attenuated when the coal is conditioned with 1-butylamine. Zeta potential measurements have also been changed after conditioning. The contact angle of water and graphite has decreased from 82.3° to 32.2°. An optimization has been performed using a Box-Behnken experimental design. Flotation has significantly affected by time and collector dosage. The pH is not a significant factor. The optimal conditions for the best efficiency using 1-butylamine as a collector are 2.0 min of flotation and 10-3 mol/L of collector.


Box-Behnken design; Butylamine; Collector; Flotation; Sub-bituminous coal

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