Multi-product Multi-product beneficiation of Inferior beneficiation of Inferior Coals to User Specific Coals to User Specific

productsproducts

Central Fuel Research Institute, Dhanbad (India)

ByKalyan SenKalyan Sen

Modified approach:

Concept 1: multi-stage beneficiation to 4 saleable products1st Stage - 3-product Jig2nd Stage - HM & FlotationOutcome: proposed plant of 1

Mt/y near the Institute

RAW COAL

POWER SECTOR

PRIMARYCLEANS

MIDDLINGS

REJECTS

STEELPLANTCLEANS

FOUNDRYCOAL

BEE-HIVE COKE-OVENS

1st Stage Washing

2nd Stage Washing

(37% Ash)

(22.6 %)

(34 %)

(62 %)

(17.5 %) (Coke Ash 21%)(Coke Ash 31 %) (27 %)

100 Wt%

50 %

20 %

30 %

28 %20 %

PIT HEAD WASHERY

COMPOSITE WASHERY

BRICKS

Concept of Multi-stage BeneficiationConcept of Multi-stage Beneficiation

alt10Raw Coal

Multistage washing of lower seam LVC coals for Metallurgical cleans as well as power coals

Primary crushing area

Baum jigMiddlingash< 34% Rejects

Precleans

Screen 13 mm Desliming screen

HM Bath HM CycloneFlotation

Sink Sink

Cleans Cleans Conc

For FBC

Foundry Cleans

ash 28%

Total Cleans ash 17 0.5 %

+ 13 mm + 0.5 mm

- 0.5 mm

-100/75 mm

Product mix from beneficiation of difficult-to-wash coal(Raw coal Ash 36-40%)

Raw coal crushed to 75mm

Fndry. Fuel (25-27 A%)20.0%

Cleans (18-19 A%)24.0%

Middlings (33-35%)18.0%

Rejects (60-65 A%)28.0%

Tailings (55-60 A%)4.0%

Flot. conc. (15-16 A%)6.0%

Sen1, 2/6

1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2Relative Density

0

10

20

30

40

50Wt%

0

10

20

30

40

50

60

70

80

90

100Char.Ash %

ash 28-30

PF Coalash ~34

FBC coalash 50-60

Steel

ash 17-18grade FC

Concept of four-product separation in multi-stage beneficiation circuit with Inferior coals

= 49

Preparation of Inferior Coal in stages

Step 1 :First cut in Jig (Im 0.14)

1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 2.10 2.20Relative Density

0

10

20

30

40 Yield,%

0

10

20

30

40

50

60

70

80

90

100Char. Ash, %

Feed (-75+0.5mm coal)wt 100%

Ash 34.0%

Clean 1 (73.5%)

Ash 27.0%

FBC Coal Ash 56.5%

Characteristic

ash

Step 2: Second

cut in Jig

= 30.0

Feed (Clean1)wt 73.5%Ash 27.0%

Preparation of Inferior Coal in stages

1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 2.10 2.20Relative Density

0

10

20

30

40 Yield,%

0

10

20

30

40

50

60

70

80

90

100Char. Ash, %

1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00

Relative Density

0

5

10

15

20Yield,%

0

10

20

30

40

50

60

70

80

90

100Char. Ash, %