Overview of Key Environmental and Energy Facts Blast Furnace Iron Making

Energy

16.1 X 106 Btu per ton of iron (gross)

Emissions

Largest source: removal of iron and slag from furnace (casting) Particulate: iron oxides, MgO, carbonaceous compounds

Effluents

Largest source: gas cooling water and scrubber water for gas cleaning Typical water flows: 6000 gal/t of iron

Byproducts/Hazardous Wastes

Total generation (t/yr) Slag: 14 X 106 Dust/sludge: ~1.1 X 106 Reuse: near 100% (slag); ~40% (dust/sludge)

result in the formation of hydrogen sulfide. Most sulfur emissions associated with slag handling result from quenching operations. It has been reported that highly toxic polychlorinated dibenzofurans (PCDFs) are dominant in the stack flue gases of sinter plants.20

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