Experimental teaching research on the structure of calcium carbonate in plate and frame filtration experiments
Mu Wei1,2, Zhao Jianfeng3, Chen Dinglong1,4, Li Shuangfan1, Duan Bingjie1, Wang Xin1,5
1. Shijiazhuang University College of Chemical Technology, Shijiazhuang 050035, China; 2. Hebei Provincial Technology Innovation Center of Building Ceramics, Shijiazhuang 051130, China; 3. Gaoyi LiMa Building Ceramic Corporation Ltd., Shijiazhuang 051330, China; 4. Shijiazhuang Light Calcium Carbonate Industry Technology Research Institute, Shijiazhuang 050300, China; 5. Shijiazhuang Key Laboratory of Low Carbon Energy Materials, Shijiazhuang 050035, China
The molecular structure and thermal stability of calcium carbonate were explored. The second derivative infrared (MIR) and temperature dependent second derivative MIR spectroscopic experiments on calcium carbonate molecules were conducted. The results showed that the infrared absorption modes of the molecular structure of calcium carbonate include: one-level frequency doubling peak of the asymmetric stretching vibration mode of CO3 functional group (2 ν■), the combined frequency (ν■ + ν■) of the asymmetric stretching vibration mode of CO3 functional group (ν■) and the symmetric stretching vibration mode of CO3 functional group (ν■), the combined frequency (ν■ + β■) of the symmetric stretching vibration mode of CO3, functional group (ν■) and the in-plane bending vibration mode of CO3 functional group (β■), the asymmetric stretching vibration mode of CO3 functional group (ν■), the symmetric stretching vibration mode of CO3 functional group (ν■), CO3 functional group out of plane bending vibration mode (r■), and CO3 functional group in-plane bending vibration mode (β■). As the measurement temperature increases, the infrared absorption wave numbers corresponding to the main functional groups in the molecular structure of calcium carbonate change to some extent. Among them, the thermal stability of the functional group r■ is relatively poor, while the thermal stability of the functional group ν■ is relatively good. Second derivative and variable temperature second derivative MIR spectroscopy can quickly conduct research on the molecular structure and thermal stability of calcium carbonate.
牟 微1,2，赵建锋3，陈丁龙1,4，李泷帆 1，段冰洁 1，王 欣1,5. 板框过滤实验中碳酸钙结构的实验教学研究[J]. 煤炭与化工, 2026, 49(7): 141-150.
Mu Wei1,2, Zhao Jianfeng3, Chen Dinglong1,4, Li Shuangfan1, Duan Bingjie1, Wang Xin1,5. Experimental teaching research on the structure of calcium carbonate in plate and frame filtration experiments. CCI, 2026, 49(7): 141-150.
