Coal Based Sponge Iron
Coal based Sponge Iron
Coal-Based Process:
· This process utilizes non-coking coal as reducing agent along with lumpy rich grade iron ore.
· The reduction is carried out in an inclined horizontal rotary kiln, which rotates at a predetermined speed. A temperature profile ranging from 800-1050 degree centigrade is maintained along the length of the kiln at different zones and as the material flows down due to gravity the ore is reduced.
· The hot reduced sponge iron along with semi-burnt coal, discharged from kiln is cooled in water-cooled cylindrical rotary cooler to a temperature of 100–200 degree centigrade.
· The discharge from cooler consisting of sponge iron, char other contaminations are passed on through magnetic separators so that sponge iron can be separated from other impurities.
· Later the sponge iron is screened into two size fractions i.e. –3 mm & +3 mm. +3 mm fraction directly goes for usage, -3 mm fraction can be either used directly where ever it is possible or is to be briquetted by using molasses and hydrated lime as binders.
CHEMICAL COMPOSITION:
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» Chemical and Physical Composition of Iron Ore
» Typical Chemical Analysis of Coal
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» Typical Chemical Analysis
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» Typical Analysis of Sponge Iron Produced in Coal Based Process
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