Effect of Physisorbed Collector on Induction Time and Kinetics in Flotation of Coal Slurries
S. A. Kondrat’ev1, T. A. Khamzina2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Academician Melnikov Institute of Comprehensive Development of Mineral Resources-IPKON, Russian Academy of Sciences, Moscow, Russia
Keywords: Flotation, coal, collector, induction time, surface activity, collector spreading velocity
Abstract
The literature review discloses preferability of using the time of induction rather than the wetting angle as a criterion of coal floatability. The authors analyze kinetics of coal flotation as function of surface properties of heteropolar collectors relative to the gas-liquid interface. The correlation between the spreading velocity of collectors on water surface and the coal flotation kinetics is determined as a case-study of fat coal slurries. Justification is given for using the time of displacement of the boundary between three states of aggregation as the time of induction. From the correlation of the spreading velocity of a collector, displacement time of the contact line (induction time) and the flotation velocity, it is found that flotation activity of the collector is governed by its properties relative to the gas-liquid interface.
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