Investigation of fine grinding and flotation to produce superclean coal. [Dry-ground and wet-ground]

Technical Report · Wed May 01 04:00:00 EDT 1985

OSTI ID:5706046

Miller, K J

Laboratory flotation tests were conducted with dry-ground and wet-ground coal to determine the effect of grinding methods on clean coal recovery and product grade. A laboratory jar mill, a stirred ball mill, and an air-classifying vertical impact mill were used for grinding the coal samples. Products of as near the same size distribution as possible were prepared by each method (i.e., nominal minus 27 ..mu..m with a mean particle size of 10 to 12 ..mu..m). The test results show that dry-ground coal is more floatable at lower reagent addition levels, but wet-ground coal provides lower ash products. For example, a dry-ground coal yielded about 40 wt % to over 70 wt % of froth product with frother reagent dosages of 0.2 to 0.5 pound per ton of dry solids (lb/ton), and the respective product ash contents ranged from about 2.0% to 3.0%. A wet-ground coal, on the other hand, yielded under 30 wt % to a little over 70 wt % froth product with the same frother reagent dosages, but the ash contents ranged from about 1.0% to 1.6%. 5 refs., 5 figs., 2 tabs.

• Research Organization: USDOE Pittsburgh Energy Technology Center, PA
• OSTI ID: 5706046
• Report Number(s): DOE/NBM-5014337; ON: DE85014337
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
ASH CONTENT
BENCH-SCALE EXPERIMENTS
CARBONACEOUS MATERIALS
COAL
COAL FINES
COMMINUTION
COMPARATIVE EVALUATIONS
DATA
ENERGY SOURCES
EXPERIMENTAL DATA
FLOTATION
FOSSIL FUELS
FUELS
GRINDING
INFORMATION
MACHINING
MATERIALS
NUMERICAL DATA
PARTICLE SIZE
SEPARATION PROCESSES
SIZE