Post-combustion CO 2 capture is a promising method for removing CO 2 from processes where emissions cannot be mitigated by renewable energy input and where the chemical reactions required for production emit CO 2 , e.g. calcination of calcium carbonate (CaCO 3 ) for cement production. One promising capture method is carbon capture in molten salts (CCMS). CCMS is a thermal swing gas-liquid process that utilizes CaO carbonation to absorb CO 2 . The molten salt used in this work is 15 wt% CaO in eutectic CaCl 2 -CaF 2 (86.2 : 13.8 wt%). The CaCl 2 -CaF 2 -CaO system has been found to have high cyclic absorption capacity (0.6 g CO 2 /g CaO), though reaction kinetics has yet to be studied. By utilizing a novel experimental setup, data is collected, and a kinetic model is developed, which can be used in a techno-economic evaluation. The model proposes a simplified description of the CaCl 2 -CaF 2 -CaO system, with the assumption that the reaction is a first order elementary reaction where CaO and CO 2 react to form CaCO 3 without any solubility of CO 2 in the molten salt. CO 2 concentration, temperature, wt% CaO and surface area of molten salt are parameters in the proposed kinetic model. The result is a kinetic model that accurately fits the experimental data with an R 2 value above 0.98. It has been found that increasing the CO 2 concentration and decreasing the temperature yield a higher CaO to CaCO 3 equilibrium conversion.