COAL
Non coking coal works as reductant in the manufacturing of iron ore. Availability of large quantity of non-coking coal has been one of the primary reasons for the spurt in production of DRI and its wide usage in steel making process.
Inventory Of Coal Reserves Of India
As a result of exploration carried out down to a depth of 1200m by the GSI and other agencies, a cumulative total of 240.748 Billion tonnes of coal resources have been established in the country as on 1.1.2003.
*Including coals of North Eastern Region.
Apart for above resources, about 141Bt of coal is likely to be available in Prognosticated category where estimation is highly tentative and predictive.
Besides the above major requirements, other properties will also have to be considered in choosing the reductant. The calorific value, which denotes the heat value available from the coal should be high. A high fixed carbon content and low volatile matter are also essential as they influence the fuel consumption.
In a nutshell the following chemical properties are thought to be ideal:
Ash, Max |
30% |
Volatile matter |
26-30% |
Fixed Carbon |
By difference in Proximity analysis |
Sulphur Max |
1.0% |
Dolomite
Blast Furnace grade Dolomite will be used as flux for sulphur control in the kiln. The dolomite should have the following approximate characteristics:
CaO + MgO Minimum 45%
SiO2+Al2O3 Maximum 5%
Dolomite will be sourced from Belha area of Bilaspur in Chhattisgarh. The mines in this region have adequate reserves and are the main source of supply of BF grade Dolomite to many sponge iron plants and Steel plants.
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