Continuous carbonization of the sodium Aluminates solution (SAS) is a key process in sinteredalumina production, where a series of carbonation tanks are connected, SAS is fed into the first tank anddischarged from the last tank, and CO2 is sparged into the tanks to precipitate the Al(OH)3. In this study, acontinuous stirred-tank reactor (CSTR) model has been developed for the continuous carbonation of thesodium aluminates solution. Based on the mechanistic analysis of the continuous carbonation, a kineticmodel established at laboratory scale was scaled up to the industrial continuous carbonation of SAS. ACSTR model was then formulated for the process under normal operation conditions based on someassumptions. The remaining unknown model parameters were estimated from the industrial data and thevalidation results show that the model can predict the composition concentrations in the carbonatedsolution by 90％ majority with the relative errors within ±5％ compared to industrial data. The influencesof the assumptions on the model are analyzed. The model developed is significant for on-line prediction,optimization and control of the industrial process.