Non-isothermal kinetics and characteristics of calcium carbide nitridation reaction with calcium-based additives
Zhihan Zhang1, Mengxiao Yu1, Xiaoyu Zhang1, Jinli Zhang1,2, You Han1,2()
1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China 2. Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
The nitridation reaction of calcium carbide and N2 at high temperatures is the key step in the production of lime-nitrogen. However, the challenges faced by this process, such as high energy consumption and poor product quality, are mainly attributed to the lack of profound understanding of the reaction. This study aimed to improve this process by investigating the non-isothermal kinetics and reaction characteristics of calcium carbide nitridation reaction at different heating rates (10, 15, 20, and 30 °C·min−1) using thermogravimetric analysis. The kinetic equation for the nitridation reaction of additive-free calcium carbide sample was obtained by combining model-free methods and model-fitting method. The effect of different calcium-based additives (CaCl2 and CaF2) on the reaction was also investigated. The results showed that the calcium-based additives significantly reduced reaction temperature and activation energy Ea by about 40% with CaF2 and by 55%–60% with CaCl2. The reaction model f(α) was also changed from contracting volume (R3) to 3-D diffusion models with D3 for CaCl2 and D4 for CaF2. This study provides valuable information on the mechanism and kinetics of calcium carbide nitridation reaction and new insights into the improvement of the lime-nitrogen process using calcium-based additives.
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