after the reduction process of iron ore in presence of coal and lime, some waste material including coal, lime, etc. remain. how can we use it again or can we use it for some other applications?
You can recover it by magnetically separating the reduced iron from it..
You also also want to separate the unreduced iron minerals via a similar method.
You may wish to fractionate the residue buy screening or electrostatic separation...
What you do with it after that is entirely another matter depending on what is in it.
During process of reduction of Iron Ore/Mill scale through tunnel kiln technology, the waste generated are dolo char, ash, tar and hot gases/air.
Dolo char may have fixed carbon more than 25% and it can be used again as reduction coal by mixing part of it's quantity with fresh reduction coal. Remaining are sold as low fixed carbon fuel.
Ash generated are used for pavement brick/tiles manufacturing.
Tar generated are used as fuel after mixing with crued furnace oil.
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