Method for simultaneous use of a single additive for coal flotation, dewatering, and reconstitution

Patent · Sun Jan 01 00:00:00 EST 1995

OSTI ID:869694

Wen, Wu-Wey ^[1]; Gray, McMahan L ^[2]; Champagne, Kenneth J ^[3]

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

A single dose of additive contributes to three consecutive fine coal unit operations, i.e., flotation, dewatering and reconstitution, whereby the fine coal is first combined with water in a predetermined proportion so as to formulate a slurry. The slurry is then mixed with a heavy hydrocarbon-based emulsion in a second predetermined proportion and at a first predetermined mixing speed and for a predetermined period of time. The conditioned slurry is then cleaned by a froth flotation method to form a clean coal froth and then the froth is dewatered by vacuum filtration or a centrifugation process to form reconstituted products that are dried to dust-less clumps prior to combustion.

• Research Organization: USDOE Pittsburgh Energy Technology Center (PETC), PA (United States)
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5379902
• OSTI ID: 869694
• Country of Publication: United States
• Language: English

Related Subjects

method
simultaneous
single
additive
coal
flotation
dewatering
reconstitution
dose
contributes
consecutive
fine
unit
operations
whereby
combined
water
predetermined
proportion
formulate
slurry
mixed
heavy
hydrocarbon-based
emulsion
mixing
speed
period
time
conditioned
cleaned
froth
form
clean
dewatered
vacuum
filtration
centrifugation
process
reconstituted
products
dried
dust-less
clumps
prior
combustion
predetermined period
unit operations
predetermined proportion
froth flotation
fine coal
heavy hydrocarbon
unit operation
clean coal
coal flotation
flotation method
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