Ultrafine grinding of low-rank coal: Final report
A study of ultrafine grinding of low-rank coals in a fluid-energy mill was undertaken. This report presents the results of the Phase I effort which included a review of the literature on ultrafine grinding, a review of theories of grinding, a combined grinding and drying experiment on Martin Lake Texas lignite, an evaluation of the energy requirements for the process, and an evaluation of the properties of the products from the grinding tests. A sample of Martin Lake Texas lignite was obtained and a series of tests were conducted in a fluid-energy mill at the Ergon, Inc., Micro-Energy Division development facility at Vicksburg, MS. The grinding fluids used were air at 116 F and steam at 225, 310, 350, 400, and 488 F as measured in the mill. The products of these tests were analyzed for volatile mattr, ash, total moisture, equilibrium moisture, heating value, density distribution, aerodynamic particle size classification, angle of repose, porosity, density, and particle size distribution. ASTM test procedures were followed where applicable. Ultimate and ash mineral analyses were also conducted on the samples. Results of the various tests are presented in detail in the report. In general, the fluid energy mill was used succssfully in simultaneous grinding and drying of the lignite. Particle size reduction to less than 10 microns on a population basis was achieved. The equilibrium moisture of the samples decreased with increasing grinding fluid temperatures. Density distribution studies showed that a significant fraction of the ash appeared in the >1.6 specific gravity particles. The energy required for the grinding/drying process increased with increasing mill temperatures. 29 refs., 18 figs., 13 tabs.
- Research Organization:
- Mississippi State Univ., Mississippi State (USA)
- DOE Contract Number:
- AC21-84FC10622
- OSTI ID:
- 7011089
- Report Number(s):
- DOE/FC/10622-2290; ON: DE87001077
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ultra fine grinding of low-rank coal. Progress report, January-March 1986
Ultrafine grinding of low-rank coal: Phases II and III: Final report
Related Subjects
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
AIR
ASH CONTENT
BROWN COAL
CALORIFIC VALUE
CARBONACEOUS MATERIALS
COAL
COAL FINES
COAL RANK
COMBUSTION PROPERTIES
COMMINUTION
DATA
DENSITY
DOCUMENT TYPES
DRYING
ELECTRON MICROSCOPY
ENERGY CONSUMPTION
ENERGY SOURCES
EXPERIMENTAL DATA
FLUIDS
FOSSIL FUELS
FUELS
GASES
GRINDING
HIGH TEMPERATURE
INFORMATION
LIGNITE
MACHINING
MATERIALS
MATTER
MEDIUM TEMPERATURE
MICROSCOPY
MOISTURE
NUMERICAL DATA
PARTICLE SIZE
PHYSICAL PROPERTIES
POROSITY
REVIEWS
SIZE
STEAM
SUBBITUMINOUS COAL
VOLATILE MATTER