The substitution of raw materials by blast furnace slag makes sense regarding energy consumption, CO_2-emission and lifetime of natural resources. A process comparison will illustrate limits and risks, as well as environmental aspects of using BFS. The energetic and CO_2 saving potentials will be shown by a raw mix calculation with maximum slag content. Computer modelling of the substitution process is due to check and forecast the consequences, including secondary fuels utilization. Finally the emissions situation is checked.
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