PDU-scale testing of microbubble flotation
Work during this past quarter was focused primarily on Task 1.1.4 (Modeling), Task 1.2.4 (Scale-Up Validation) and Task 1.2.5. (Coarse Coal Flotation). A mathematical model was developed to relate air hold-up and bubble diameter within the column to superficial gas and liquid flows. This model was then incorporated into an iterative scale-up procedure which is being validated as part of Task 1.2.4. Scale-up validation tests were conducted using minus 28-mesh run-of-mine Elkhorn seam coal in 6-, 8-, and 14-inch diameter microbubble flotation columns. The model from Task 1.2.4 was used to estimate bubble size data from the experimental data obtained in these tests, and the scale-up procedure was validated for these three columns. Finally, a performance comparison between microbubble column flotation and conventional flotation was carried out using minus 28-mesh Elkhorn seam coal. The microbubble column flotation process was found to reduce the ash content of the final product by approximately 50% over the product produced by conventional flotation at an equivalent combustible recovery. Furthermore, the 14-inch diameter microbubble column was able to produce a product containing approximately 1.5% ash with combustible recoveries in excess of 90% at a throughout of over 300 lb/hr. 4 refs., 10 figs.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (USA). Dept. of Mining and Minerals Engineering
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC22-86PC91274
- OSTI ID:
- 5692185
- Report Number(s):
- DOE/PC/91274-T5; ON: DE91012251
- Country of Publication:
- United States
- Language:
- English
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PDU-scale testing of microbubble flotation
PDU-scale testing of microbubble flotation
Related Subjects
COAL FINES
FLOTATION
COAL PREPARATION
PILOT PLANTS
AERATION
BUBBLES
COAL
COMBUSTION
COMPILED DATA
DEASHING
FLOW RATE
MATHEMATICAL MODELS
PROGRESS REPORT
SEPARATION EQUIPMENT
WASHING
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CLEANING
DATA
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
INFORMATION
MATERIALS
NUMERICAL DATA
OXIDATION
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES
010300* - Coal
Lignite
& Peat- Preparation- (1987-)