Abstract
Abstract The purpose of the research was to investigate the technical feasibility of a novel flotation technique for the recovery of extremely small particles of coal from water. This approach, colloid flotation, utilizes microbubbles generated at low gas flow rates. A procedure was also developed for preparing stable and reproducible suspensions of colloidal coal as might be found in the effluents of preparation plants. Oxidation of the coal contributed to its ability to remain dispersed for long periods of time over a broad pH range. Several parameters controlling flotation were examined including collector type and concentration, pH, gas flow rate, and frother dose in batch, bench-scale studies. Recovery attempts with an anionic collector were not successful. The coal was removed very effectively, however, using a cationic surfactant collector. Rates of removal were greatest at low pH and depended on gas flow rate as well as the collector and frother doses. The results were related to the electrophoret...
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