Abstract：In order to prepare a better morphology of calcium carbonate microspheres, calcium chloride and sodium carbonate were used as raw materials, and two different ways were used to prepared calcium carbonate microspheres. The products were characterized by Field emission scanning electron microscope,X-ray diffraction and Fourier transform infrared spectroscopy.Results show that under the control of the volume fraction of 50%ethanol and 1.0 mol/L citric acid solution can prepared good morphology of calcium carbonate microsphres, and the morphology of as-prepared calcium carbonate microspheres better by adding citric acid than the other method, and the as-prepared samples by two methods were composed by different crystal forms. The mechanism is also discussed through changing the reaction conditions.

Keywords: calcium carbonate; microspheres; ethanol; citric acid