Surface chemistry aspects of coal flotation in bore water
O Ozdemir, E Taran, MA Hampton, SI Karakashev, AV Nguyen
INTERNATIONAL JOURNAL OF MINERAL PROCESSING | ELSEVIER SCIENCE BV | Published : 2009
Several theories have been proposed to explain enhancement of coal flotation in salt solutions. In this paper, surface chemistry aspects of coal flotation in bore (hypersaline) water were examined using bubble-particle attachment time experiments, zeta potential measurements, cyclic measurements of contact angle and Atomic Force Microscopy (AFM). The attachment time experiments showed that the bubble-particle attachment in deionized water was instantaneous and independent of the particle size. The attachment in bore water required longer time, which increased with increasing particle size. The cyclic measurements of contact angle on a flat coal surface showed that the coal hydrophobicity as ..View full abstract
The Australian Research Council is gratefully acknowledged for financial support through a Discovery grant (AVN). BHP Billiton Mitsubishi Alliance (BMA) is gratefully acknowledged for funding the BMA Chair of Minerals Processing at the University of Queensland (AVN) and the coal samples (Mr Ian Brake and Mr Ben Cronin). BHP Billiton Nickel West (Perth, Australia) is acknowledged for providing the bore water samples. We are indebted to Mr Maung Aung Min from the JKMRC, the University of Queensland for helping with the bubble-particle attachment time measurements.