COKING COAL :
These coals, when heated in the absence of air, form coherent beads, free from volatiles, with strong and porous mass, called coke.
SEMI COKING COAL :
- These have coking properties
- Mainly used in steel making and metallurgical industries
- Also used for hard coke manufacturing
These coals, when heated in the absence of air, form coherent beads not strong enough to be directly fed into the blast furnace. Such coals are blended with coking coal in adequate proportion to make coke.
NLW COKING COAL :
- These have comparatively less coking properties than coking coal
- Mainly used as blend-able coal in steel making, merchant coke manufacturing and other metallurgical industries
This coal is not used in metallurgical industries. Because of higher ash content, this coal is not acceptable for washing in washeries. This coal is used for power utilities and non-core sector consumers.
NON-COKING COAL :
These are coals without coking properties.
WASHED AND BENEFICIATED COAL:
- Mainly used as thermal grade coal for power generation
- Also used for cement, fertilizer, glass, ceramic, paper, chemical and brick manufacturing, and for other heating purposes
These coals have undergone the process of coal washing or coal beneficiation, resulting in value addition of coal due to reduction in ash percentage.
- Used in manufacturing of hard coke for steel making
- Beneficiated and washed non-coking coal is used mainly for power generation
- Beneficiated non-coking coal is used by cement, sponge iron and other industrial plants
Middlings are by-products of the three stage coal washing / beneficiation process, as a fraction of feed raw coal.
- Used for power generation
- Also used by domestic fuel plants, brick manufacturing units, cement plants, industrial plants, etc.
Rejects are the products of coal beneficiation process after separation of cleans and / or middlings, as a fraction of feed raw coal.
CIL COKE / LTC COKE :
- Used for Fluidized Bed Combustion (FBC) Boilers for power generation, road repairs, briquette (domestic fuel) making, land filling, etc.
CIL Coke / LTC Coke is a smokeless, environment friendly product of the Dankuni Coal Complex, obtained through low temperature carbonisation.
COAL FINES / COKE FINES :
- Used in furnaces and kilns of industrial units
- Also used as domestic fuel by halwais, hotels, etc.
These are the screened fractions of feed raw coal and LTC coke / CIL Coke respectively, obtained from the Dankuni Coal Complex and other coke oven plants.
TAR / HEAVY OIL / LIGHT OIL / SOFT PITCH :
- Used in industrial furnaces as well as for domestic purposes
These are products from Dankuni Coal Complex using low temperature carbonisation of non-coking coal in vertical retorts.
- Used in furnaces and boilers of industrial plants as well as power houses, oil, dye, pharmaceutical industries, etc.
|The table below sets forth the various gross calorific value (GCV) based bands of non coking coal produced by us
| GCV Bands
||Exceeding 6700 and not exceeding 7000
||Exceeding 6400 and not exceeding 6700
||Exceeding 6100 and not exceeding 6400
||Exceeding 5800 and not exceeding 6100
||Exceeding 5500 and not exceeding 5800
||Exceeding 5200 and not exceeding 5500
||Exceeding 4900 and not exceeding 5200
||Exceeding 4600 and not exceeding 4900
||Exceeding 4300 and not exceeding 4600
||Exceeding 4000 and not exceeding 4300
||Exceeding 3700 and not exceeding 4000
||Exceeding 3400 and not exceeding 3700
||Exceeding 3100 and not exceeding 3400
||Exceeding 2800 and not exceeding 3100
||Exceeding 2500 and not exceeding 2800
||Exceeding 2200 and not exceeding 2500
|The table below sets forth the various grades of coking coal:
|Grade|| Ash Content |
|Steel Grade I ("ST I")||Ash content < 15%|
|Steel Grade II ("ST II")|| 15% < = Ash content < 18% |
| Washery Grade I ("W I")||18% < = Ash content < 21% |
| Washery Grade II ("W II")||21% < = Ash content < 24%|
| Washery Grade III ("W III")|| 24% < = Ash content < 28% |
| Washery Grade IV ("W IV")|| 28% < = Ash content < 35% |
|The table below describes the grades of semi-coking coal:
|Grade|| Ash + Moisture Content |
|Semi coking grade I ("SC I")||Ash + moisture content < 19%|
|Semi coking grade II ("SC II")|| 19% < = Ash + moisture content < 24% |