1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China 2 Guangxi Calcium-based Materials Collaborative Innovation Center, Chongzuo South Cement Co., Ltd., Chongzuo 532200, Guangxi, China
Abstract: With calcium hydroxide and carbon dioxide as raw materials, trisodium citrate dihydrate as crystal control agents and ethanol as co-surfactant, flake-like calcium carbonate were successful prepared by pressurized carbonation. The morphology and structure of the samples were characterized by FESEM, XRD, FTIR, AFM, etc. And the influences of calcium carbonate morphology are investigated by changing the amount of adding trisodium citrate dehydrate and ethanol, the reaction temperature, the pressure of the CO2, etc. The results showed that under the conditions of reaction temperature of 100 ℃, sodium citrate content of 8%, ethanol content of 10 mL and CO2 pressure of 1.5 MPa, flake-like nano calcium carbonate with thickness of about 7—8 nm, width of about 3.5 μm, length of about 25 μm and length to width ratio of about 7∶1 was successfully prepared, and the products were of uniform sizes and relatively regular morphologies. The crystalline form of flake-like calcium carbonate was calcite, and the specific surface area was about 27.11 m2·g-1. Pressurized carbonation increased the solubility of CO2 in solution, and under the action of trisodium citrate, flake-like nano calcium carbonate was directionally formed.
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