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Physico-chemical properties of slag influence the productivity of the steelmaking processes to a great extent. The rapid formation of physically and chemically active slag facilitates removal of sulfur and phosphorus from the melt. It reduces metal loss and formation of metal-regulus in the slag; furthermore it decreases wear in the refractory lining. Viscous slag is physically poorly active and has a low refining capacity, thus, reaction processes with metal slow down. Such a viscous slag will lead to an increase in the metal losses due to the regulus formation and slag splashing. It often leads to the lance becoming clogged and formation of skulls on the neck of the vessel. High slag fluidity is also not desirable due to the increased refractory wear of the converter lining. In the process of steelmaking in an oxygen converter it is necessary to obtain at the end of the blowing process a sufficiently flowable, physically and chemically active homogeneous slag with basicity CaO/ SiO2 = 3.0–3.5. As it is known, the chemical composition of the converter slag and intensity of lining destruction vary in different stages of the converter process. The highest rate of destruction of the lining in the converter is observed during the formation of slag with the basicity CaO/SiO2 = 1.0–1.5 Influence of Magnesium Oxide Content on Kinetics of Lime Dissolution in Steelmaking Slags