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

Patent · 01 January 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: Pittsburgh Energy Technology Center
• 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

/209/210/252/
additive
centrifugation
clean
clean coal
cleaned
clumps
coal
coal flotation
combined
combustion
conditioned
consecutive
contributes
dewatered
dewatering
dose
dried
dust-less
emulsion
filtration
fine
fine coal
flotation
flotation method
form
formulate
froth
froth flotation
heavy
heavy hydrocarbon
hydrocarbon-based
method
mixed
mixing
operations
period
predetermined
predetermined period
predetermined proportion
prior
process
products
proportion
reconstituted
reconstitution
simultaneous
single
slurry
speed
time
unit
unit operation
unit operations
vacuum
water
whereby