fine coal beneficiation presentation us-india coal working group-2011
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8/13/2019 Fine Coal Beneficiation Presentation US-India Coal Working Group-2011
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FINE COALBENEFICIATION
Roe-Hoan Yoon, Director Center for Advanced Separation Technologies
Virginia Tech, Blacksburg, Virginia 24060
U.S.-India Coal Working Group8 th Annual MeetingNew Delhi, India
March 24, 2011
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Indian Coal
ProblemMineral matter is finelydisseminated in coal matrixDifficult to obtain low-ash product
Causes low thermal efficiencyin power plants
Requires sweetener formetallurgical application>$3 billion import
SolutionFine grinding for liberation ofmineral matter
Fine coal cleaning Fine coal dewatering
2 mm
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Finer coal produces lower-ash coal.
0
20
40
60
80
100
0 6 12 18 24 30
Product Ash (%)
C o m
b u s t i
b l e R e c o v e r y
( % )
-100 mesh
-325 mesh
Release Analysis Assam Coal II
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Another Example
0
20
40
60
80
100
0 6 12 18 24 30
Product Ash (%)
C o m
b u s
t i b l e
R e c o v e r y
( % )
28 x 100 mesh-100 mesh-325 mesh
Release Analysis Assam Coal I
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Middle Fork, Virginia
ThenCoal industry discards fine coalImpoundment
~2-2.5 billion tons in the U.S.
Underground injection
Microcel TM Technology developed atCAST
>$50 million profit from one pondand Now
Microcel Technology
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Microcel Technology in AustraliaLicensed to Eriez
Red Mountain(BMA)
The technology is used to recovercoal in operating plants.
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Moura Dawson(Anglo Coal)
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A missing link
ash/sulfur
Fine CoalCleanCoal
water
Water Flotation
Dewatering
?
D i Aid T h l
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Dewatering Aid TechnologyLicensed to Nalco Company
0 5 10 15 20 25 30 35 400
3
6
9
12
15
18
21
24
27
30
V o
l u m e
( c m
3 )
Time (sec)
Base Line100 g/ton Flocculants1 lb/ton Dewatering Aid
2 lb/ton Dewatering Aid 3 lb/ton Dewatering Aid 5 lb/ton Dewatering Aid 17
19
21
23
25
27
0 0.50 1.00 1.50
Reagent Dosage (lb/t)
C a k e M o i s t u r e
( % )
LaboratoryIn-Plant
Pinnacle impoundment, WV
b f h l
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Hyperbaric Centrifuge TechnologyLicensed to Decanter
Screen-bowl Centrifuge
Hyperbaric (or Centrabaric TM ) Centrifuge
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Commercial Installation
Jim Walter Resources(Walter Energy Inc.)Brookwood, Alabama
As a result of successful test results with the first unit, the companybought more units. Other companies may follow the suite.
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Proposed Flowsheet for Indian Coking Coal
SlurryFeed
Note: Not allclarified and
process waterstreams are
shown.
ExistingPlant
ColumnFlotation
Waste
Four-StageConditioner
Thickener
Disc Filter
Clean Coal
Filtrate
Pump
VacuumReceiver
VacuumPump
Conveyor
Sparger Compressor
RotaryDistributor
ClassifyingCyclones
O/F
PumpU/FPump
FeedSump
RodMill
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Summary
CAST technologiesCommercially available technologiesMicrocel TM, Dewatering aids, Hyperbaric centrifuge
A novel dewatering technology
Under developmentProposed work
To design and build a 75-100 tph fine coal beneficial plantMETSO Minerals-India, Prime
EngineeringConstruction
Virginia Tech, Subcontractor Lab workFlowsheet design
BenefitsIncrease domestic supply of metallurgical coal
Decrease import of metallurgical coal
Improve coal quality and reduce CO 2 emissions
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Acknowledgement
The National Energy Technology Laboratory for financialsupport
Licensees of the technologies developed at CASTMetso MineralsEriez ManufacturingNalco CompanyDecanter Machine Company
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