Electric Arc Furnace slag
Produced during carbon steel production, Electric Arc Furnace slag is a manufactured aggregate which is a valuable source of oxides for the cement industry.
The content of iron oxides (FeOx) in common Portland cement ranges between 3 and 6%. Possible sources for iron oxide are iron ore or, more preferably, byproducts of the steel processing industry such as mill scale or electric arc furnace slag (EAFc slag). The total content of iron oxides of mill scale exceeds 90% of its chemical composition. It is thus proven an ideal raw material for the production of clinker.
Less common alternative is the use of EAFc slag. The FeOx content in the EAFc slag ranges between 25-35%. The replacement of mill scale with EAFc slag is technologically feasible and economically viable practice. In Greece, the use of EAFc slag as raw material for cement production commenced in 2006 and, since then, 300.000 t have been used for this purpose.