Fine coal cleaning via the micro-mag process

Patent · 01 January 1991

OSTI ID:867860

Klima, Mark S ^[1]; Maronde, Carl P ^[2]; Killmeyer, Richard P ^[3]

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1. Finleyville, PA
2. McMurray, PA
3. Pittsburgh, PA

A method of cleaning particulate coal which is fed with a dense medium slurry as an inlet feed to a cyclone separator. The coal particle size distribution is in the range of from about 37 microns to about 600 microns. The dense medium comprises water and ferromagnetic particles that have a relative density in the range of from about 4.0 to about 7.0. The ferromagnetic particles of the dense medium have particle sizes of less than about 15 microns and at least a majority of the particle sizes are less than about 5 microns. In the cyclone, the particulate coal and dense-medium slurry is separated into a low gravity product stream and a high gravity produce stream wherein the differential in relative density between the two streams is not greater than about 0.2. The low gravity and high gravity streams are treated to recover the ferromagnetic particles therefrom.

• Research Organization: Pittsburgh Energy Technology Center
• Assignee: United States Department of Energy (Washington, DC)
• Patent Number(s): US 5022892
• OSTI ID: 867860
• Country of Publication: United States
• Language: English

Related Subjects

/44/209/
15
37
600
articles therefrom
cleaning
coal
coal cleaning
coal particle
comprises
comprises water
cyclone
cyclone separator
dense
dense-medium
density
differential
distribution
fed
feed
ferromagnetic
fine
fine coal
gravity
inlet
magnetic particle
magnetic particles
majority
medium
medium comprises
method
micro-mag
microns
particle
particle size
particle sizes
particles
particles therefrom
particulate
particulate coal
process
produce
product
product stream
range
recover
relative
separated
separator
size
size distribution
sizes
slurry
stream
streams
therefrom
treated
via
water