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JOURNAL OF SYNTHETIC CRYSTALS ›› 2024, Vol. 53 ›› Issue (5): 864-872.

• Research Articles • Previous Articles     Next Articles

Preparation of Highly Dispersed Nano Calcium Carbonate by Low-Temperature Carbonization Method

XING Jiabin, LI Wei, JIA Songyan, MA Yali, LI Xue, ZHENG Qiang   

  1. 1. College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;
    2. Liaoning Engineering Research Center for Magnesium and Calcium Inorganic Functional Materials, Shenyang 110142, China;
    3. Shenyang Key Laboratory for the Utilization Technology of Magnesium and Calcium Resources, Shenyang 110142, China
  • Received:2023-12-19 Online:2024-05-15 Published:2024-05-21

Abstract: Highly dispersed nano calcium carbonate was prepared using limestone as raw material by low-temperature carbonization method. The nano calcium carbonate samples were characterized by XRD, SEM, TEM, etc. The effects of slurry ratio, carbonization temperature, CO2 aeration rate, aging time, and crystal control agent on the particle size and dispersion degree of nano calcium carbonate were investigated. The process conditions for preparing nano calcium carbonate were obtained as follows: slurry ratio of 5%, carbonization temperature of 15 ℃, CO2 aeration rate of 200 mL/min, aging time of 2 h, and ZnCl2 as the crystal control agent. Under these conditions, cubic nano calcium carbonate with a grain size of 25~35 nm and uniform distribution was prepared. The growth mechanism of nano calcium carbonate was analyzed by Materials Studio. The results show that the (104) and (116) crystal planes of calcium carbonate were thermodynamically stable and would eventually become tenacious exposed crystal planes, which promots the generation of cubic nano calcium carbonate.

Key words: limestone, nano calcium carbonate, low-temperature carbonization, crystal growth, growth mechanism, crystalline controlling agent

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