Abstract: The preparation process of calcium carbonate by carbonation of CO2 and calcium ion in weak-acid medium was studied. The affecting factors such as concentration of calcium acetate，pressure of CO2，reaction temperature，time of aging and reaction time on the preparation of precipitated calcium carbonate were discussed. The optimum reaction conditions were as follows：concentration of calcium acetate 17%，carbon dioxide pressure 2.5 MPa，reaction temperature 95 ℃，reaction time 30 minutes，and ageing time 5 hours. The yield of calcium carbonate was about 20.6%. The calcium carbonate particles had good dispersivity and the volumetric mean size was about 1.4 μm. This process provides the basic experimental data for comprehensive treatment of CO2 and calcium containing slag to produce calcium carbonate.

摘要： 研究了弱酸性介质中钙离子与CO2反应生成沉淀碳酸钙的工艺过程，探讨了乙酸钙浓度、反应温度、CO2压力、反应时间及陈化时间等因素对制备碳酸钙的影响。结果表明，在乙酸钙质量分数17%，CO2分压2.5 MPa，反应温度95 ℃时，反应30 min，陈化5 h的条件下，碳酸钙的收率为20.6%，制备出分散性良好的平均粒径为1.4 μm的沉淀碳酸钙。