fine coal beneficiation presentation us-india coal working group-2011

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

fine coal beneficiation presentation us-india coal working group-2011

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