Center for Advanced Separation Technologies CAST CAST COST EFFECTIVE TECHNOLOGY FOR BENEFICIATION AND RECOVERY OF FINE COAL Roe-Hoan Yoon, Director Center for Advanced Separation Technologies Virginia Tech, Blacksburg, Virginia 24060 Presented at: U.S.-India 6 th Coal Working Group Meeting L’Enfant Plaza Hotel, Washington, D.C. September 23, 2009
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Beneficiation and Recovery of Fine Coal - Energy · FOR BENEFICIATION AND RECOVERY OF FINE COAL Roe-Hoan Yoon, ... U.S.-India 6 th Coal Working Group Meeting L’Enfant Plaza Hotel,
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Center for Advanced Separation Technologies CASTCAST
COST EFFECTIVE TECHNOLOGY
FOR BENEFICIATION AND RECOVERY OF FINE COAL
Roe-Hoan Yoon, Director
Center for Advanced Separation Technologies
Virginia Tech, Blacksburg, Virginia 24060
Presented at:
U.S.-India 6th Coal Working Group Meeting
L’Enfant Plaza Hotel, Washington, D.C.
September 23, 2009
Center for Advanced Separation Technologies CASTCAST
Indian Coal
� Problem� Difficult to clean
• Finely disseminated mineral matter
� Coking coal requires low ash coal• <8% ash
• Imported coal is used as sweetener– High cost
� Solution� Fine grinding for improved
liberation
� Fine coal cleaning
� Fine coal dewatering 2 mm
Center for Advanced Separation Technologies CASTCAST
0
20
40
60
80
100
0 6 12 18 24 30
Product Ash (%)
Co
mb
usti
ble
Reco
very
(%
)
28 x 100 mesh
-100 mesh
-325 mesh
Release Analysis
Assam Coal I
Fine coal produces lower-ash coal.
Center for Advanced Separation Technologies CASTCAST
But fine coal cleaning is costly and difficult.But fine coal cleaning is costly and difficult.
SieveBends
Dense Media
Cyclone
BasketCentrifuges
Dense Media Vessel
DewateringScreens
Raw CoalScreens
Coal Spirals Screen-BowlCentrifuges
ClassifyingCyclones
Med
ium
Solid-Solid Solid-LiquidSize-SizeC
oar
seF
ine
Ult
rafi
ne Froth Flotation Disc Filter
Increasing Difficulties
Increasing Difficulties
Center for Advanced Separation Technologies CASTCAST
Advanced Fine Coal Cleaning Technologies
Developed at Virginia TechUnder DOE Sponsorship
� Advanced Flotation� Microcel technology� New FLS technology
� Advanced Dewatering� Dewatering aids
• Licensed to Nalco
• Pinnacle pond recovery
� Hyperbaric centrifuge• Licensed to Decanter
• Field tests are ongoing
All of the technologies are commercially available.
Center for Advanced Separation Technologies CASTCAST
Bubble Generation in Microcel
MicrocelSpargers
Pump
In-LineMixer
BubbleGenerator
MicrocelSpargers
Pump
In-LineMixer
BubbleGenerator
MicrocelSpargers
Pump
In-LineMixer
BubbleGenerator
Center for Advanced Separation Technologies CASTCAST