Kinetics of Calcium Carbonate (CaCO 3 ) Precipitation from a Icel‐Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction

The effects of time, CO 2 ‐gas‐injection pressure, and bulk temperature on the precipitation of Ca 2+ ions as a precipitated calcium carbonate (PCC) from a dolomite leach solution were investigated. Precipitation periods from 1 to 7 min were examined, and experiments were run at CO 2 ‐injection pressures of 200–800 kPa. Effects of bulk temperature were studied in the range from 40 to 70°, and precipitation rates of PCC were determined by measuring the Ca 2+ concentrations in the initial and effluent solutions. Influences of these parameters on the subsequent incorporation of Mg 2+ ions with the precipitate are discussed in detail. Kinetic analysis of the precipitation was performed by considering the rates as a function of CO $\rm{ {_{3}^{2-}}}$ ‐ion concentrations. Results obtained by this process clearly show that Ca 2+ ions in the solution can successfully be precipitated as a calcium carbonate product containing 54.70% of CaO and 0.77% MgO, at the rate of 2.01 m M h −1 .