Coal preparation using magnetic separation. Volume 3. Final report. [Wet high gradient]

Technical Report · Tue Jul 01 00:00:00 EDT 1980

DOI:https://doi.org/10.2172/5145333· OSTI ID:5145333

Weschler, I.; Doulin, J.; Eddy, R.

Research objectives were to determine the degree of coal desulfurization that can be achieved with wet high-gradient magnetic separation, to study the effects of operating conditions on coal cleaning, to establish correlations between performance of a small cyclic separator and a large continuous unit, and to estimate the capital costs which might be associated with commercial high-gradient magnetic coal cleaning. These objectives were accomplished by testing five eastern and midwestern coals in SALA-HGMS laboratory and pilot-plant separators under a variety of experimental conditions. Good correlation was found between performance of the two separators when run with the same feeds and under equivalent operating conditions. Up to 82% of the pyritic sulfur in the feed was removed in the separators, and ash reductions of up to 60% were also accomplished. Separation performance was found to be sensitive to coal type, mesh of feed grind, and separator operating conditions. The classic mineral-processing conflict between product grade and recovery was encountered throughout the program. For example, the 82% maximum pyritic-sulfur reduction was accomplished with a clean-coal yield of only 37%. However, numerous tests were performed in which high levels of desulfurization were achieved with reasonable coal recoveries. A preliminary economic analysis was performed for a hypothetical commercial beneficiation facility, using performance data acquired in the experimental program. The analysis indicated that capital investment for magnetic separation equipment in such a facility could range from $27,844 to $71,856 per ton of hourly capacity. These estimates apply only to the specific coals studied in the test program.

• Research Organization: Sala Magnetics, Inc., Cambridge, MA (USA)
• OSTI ID: 5145333
• Report Number(s): EPRI-CS-1517(Vol.3)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL PREPARATION
MAGNETIC SEPARATORS
PERFORMANCE TESTING
ASHES
COAL
DESULFURIZATION
ECONOMICS
EFFICIENCY
EXPERIMENTAL DATA
PYRITE
REMOVAL
YIELDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COMMINUTION
CONCENTRATORS
DATA
ENERGY SOURCES
FOSSIL FUELS
FUELS
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MINERALS
NUMERICAL DATA
ORES
PYRITES
RESIDUES
SULFIDES
SULFUR COMPOUNDS
SULFUR ORES
TESTING
TRANSITION ELEMENT COMPOUNDS
013000* - Coal
Lignite
& Peat- Transport
Handling
& Storage