Kinetics of lime dissolution in model and industrial steelmaking slags has been investigated. Samples of lime in a cylinder shape of predetermined size were immersed for a fixed time in the molten slag at temperatures between 1400 – 1600°?. Considering the experimental data derived: mass of dissolved calcium oxide, linear dimensions of calcium oxide samples and the total mass balance of CaO in the liquid layer as well as contact area of the solid-liquid phases, mass transfer coefficients have been determined. The dependences of the dissolved CaO mass, linear rate of samples dissolution and content of CaO in the slag phase on the duration of the dissolution process have been obtained. Activation energy has been calculated with the value lower than 200 kJ per mol. The low activation energy value characterizes the diffusion limiting step in the process of lime dissolution in slag.
