Abstract
The CO2 mineralization is an economical route to reduce CO2 emission for the production of high-value carbonate products. The performance of CO2 indirect mineralization of MgSO4 by (NH4)2CO3 solution was studied systematically. The effects of process parameters on the reaction performance and morphology of MgCO3·3H2O were investigated. In the reaction process, three stages were observed, including nucleation induction, solid phase growth and equilibrium stage. The nucleation induction period and equilibrium time are shortened with the increase of reaction temperature, initial reactants concentration, stirring speed and (NH4)2CO3/MgSO4 molar ratio. These parameters also play a vital role in the morphology of products. It was found that the difference between crystal growth rate and mass transfer rate has a significant impact on crystal morphology. A kinetic model was derived from the solid phase growth rate. The estimated activation energies of forward and reverse reaction are 30.37 kJ/mol and 32.71 kJ/mol, respectively.
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