Ladle Furnace slag
Ladle slag is produced during the secondary refining of steel and is a valuable source of calcium oxide for the cement industry.
Ladle furnace slag is produced through the addition of lime (CaO), and dolomitic limestone (CaO.MgO) in the electric furnace. The resulting byproduct, ladle furnace slag, contains high concentrations of calcium oxide. Due to high CaO concentrations the material can be used in the production process of cement, as a limestone replacement. This substitution results in a) significant reduction of energy consumption, preventing the necessity of chemical conversion of CaCO3 to CaO, b) decrease of CO2 emissions in the production process of the clinker and c) generally reduction of the ecological footprint of the cement industry.