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Coking Coal
Metallurgical Coal or Hard Coking Coal
Hard coking coal is an input into the production of steel, rather than being used only as a fuel in itself. In this way, the demand for coking coal is tied to the demand for steel. Adding to the value of this coal is the scarcity. There are few places in the world that have access to this resource
The coke made from the metallurgical coal plays three roles
- Energy for chemical reactions.
- Reducing gases to convert the iron ore to metallic iron.
- A porous permeable bed to support the iron ore and allow the molten metal to flow to the bottom of the blast furnace.
Coke Properties | ||
CSR | 64.00 | |
CRI | 28.00 | |
Ash Fusion temperatures (Reducing) | ||
Initial Deformation Temperature | °C | >1550 |
Softening Temperature | °C | >1550 |
Hemispherical Temperature | °C | >1550 |
Fluid Temp | °C | >1550 |
Gieseler Plastometer Values | ||
Initial Softening Temperature | (“C) | 415 |
Maximum Fluidity Temperature | (C) | 450 |
Resolidification Temp | (“C) | 469 |
Plastic Temp | (“C) | 58 |
Grade | Ash Content ( %) |
Steel – I | Upto 15 |
Steel- II | Exceeding 15 and upto 18 |
Washery. I | Exceeding 18 and upto 21 |
Washery. II | Exceeding 21 and upto 24 |
Washery. III | Exceeding 24 and upto 28 |
Washery. IV | Exceeding 28 and upto 35 |
Grade | Ash + Moisture Content ( %) |
Semi Coking-I | Not Exceeding 19 % |
Semi Coking –II | Exceeding 19 % but not exceeding 24 % |
Analysis | Basis | Typical Value |
Total Moisture | (% arb) | 8.50 |
Air Dried Moisture | (% adb) | 1.50 |
Ash | (% adb) | 9.20 |
Volatile Matter | (% adb) | 25.00 |
Fixed Carbon | (% adb) | 64.30 |
Total Sulphur | (% adb) | 0.42 |
Phosphorus in coal | (% adb) | 0.046 |
CSN | 7.00 | |
Maximum Fluidity | (ddpm) | 450.00 |
Mean Maximum Vitrinite Reflectance | (%) | 1.19 |
Ultimate Analysis | ||
Carbon | (% db) | 86.89 |
Hydrogen | (% db) | 4.96 |
Nitrogen | (% db) | 2.26 |
Oxygen | (% db) | 5.48 |
