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| Coal Coal can be broadly classified into two categories - cooking coal and non - cooking coal. Cooking coal is primarily used for metallurgical applications whereas non-cooking coal is used as fuel in power plants and for production of Sponge Iron. India has shortage of cooking coal but there are abundant deposits of non cooking coal. Whereas India is importing cooking coal to feed its blast furnaces, there is no problem regarding availability of non - cooking coal, which is required for power generation and sponge Iron production. |
| Requirements for coal for sponge iron |
| S. No. | Charecteristics | Requirement | ||||
1. |
Total
moisture content (at 60% RH and 40°C) percent by mass max. |
6 | ||||
2. |
Grade & UVH kcal/kg | B/C, 4940 - 6200 | ||||
3. |
Fixed Carbon | > 42 | ||||
4. |
V.M. (air dry) | > 30 | ||||
5. |
Ash, percent by mass | 22 to 25 | ||||
6. |
IDT | >1280°C | ||||
7. |
Reactivity | >1.7 cc of CO per gram of 'C' | ||||
8. |
Size, mm | (-) 22 + 3 | ||||
| The basic property of coal is the heat potential or its calorific vcontent. Coal also contains ash, moisture and other impurities. The heating value of coal reduces with increase in ash content, as some heat is required to burn the ash. |
| Reserve
position of coal Indian coal accounts for about 0.8% of the geological reserves and 5.7% of the proven reserves in the world USA, Russia, UK, France, Belgium, Australia, South Africa and Canada are some of the countries having large deposits of good quality metallurgical coal. |
| Dolomite Dolomite is mainly used as a desulphrising agent to prevent the pick up of sulphur by the sponge iron from the sulphur released by the burning of coal inside the furnace. The initial specifications for dolomite were 1 - 4 mm later it was far more suitable by which the consumption can be reduce by 50%. This was mainly due to the fact that lot of dolomite fines were being lost to waste gases and with 4 - 8 mm fraction this loss was minimized. India has adequate Dolomite reserves and hence avalability is not a problem. |
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