This thesis investigates the experimental and technical aspects of converting carbon dioxide (CO2) into calcium carbonate, with a focus on the necessity of purifying CO2 before the mineralization process. The first part concerns an experimental setup, involving 12 different trials, varying the concentrations of calcium and CO2, starting from pure calcium oxide (CaO). Furthermore, in the second part, a techno economic comparative analysis (TEA) was conducted. Based on literature dataset, two different calcium- containing feedstock materials were chosen, respectively wollastonite, a naturally occurring mineral, and steel slag, a disposal product of slag industry. These analyses were conducted for a mixed plastic waste gasification process to produce hydrogen as the base case.