Hydrocarbon-oil encapsulated bubble flotation of fine coal. Technical progress report for the sixth quarter, January 1, 1992--March 30, 1992
Collector dispersion plays an important role in fine coal flotation because the hydrophobicity and thus flotation rate/selectivity may be increased by dispersing the collector. In this study, four modes of collector dispersion techniques were tested. They were mechanical agitation, ultrasonic energy dispersed collector addition, atomized collector addition, and gasified collector addition. These methods were tested on the flotation of four different ranks of the coal samples of -600{mu}m size (-30 mesh US sieve, or -28 mesh Tyler sieve). In addition to flotation experiments, induction time of bubble attachment to the bed of fine coal particles was measured. The ultrasonic energy dispersed and atomized collector addition techniques enhanced flotation yield and most significantly improved the kinetics of fine coal flotation. The gasified collector flotation method could increase the selectivity of separation and decrease the collector consumption. The combustible recovery by the gasified collector flotation was lower than that by the conventional method but the selectivity by the former method was higher than that by the latter method. Application of the four different collector dispersion methods enhanced the hydrophobic character of all the four ranks of the coal samples as was evidenced by the induction time measurement as well as the flotation responses.
- Research Organization:
- West Virginia Univ., Morgantown, WV (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90314
- OSTI ID:
- 10109979
- Report Number(s):
- DOE/PC/90314-T2; ON: DE95005504; TRN: 95:001393
- Resource Relation:
- Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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