Inorganic Chemicals Industry >
Effect on kinetics of limestone decomposition under different CO2 atmospheres
Received date: 2019-09-28
Online published: 2020-03-31
Thermal decomposition characteristics of limestone were studied by thermal gravimetric differential scanning calorimetry（TG-DSC） under different concentrations of CO2（mixture of CO2 and air）.The TG and DSC curves obtained from the experimental results showed that the decomposition of calcium carbonate was an endothermic reaction,and the reaction range was mainly in the range of 750~950 ℃;with the increasing of heating rate,the reaction speed was increased,and the TG curve was moved to the high temperature region.The DSC curve showed obvious increasing on endothermic peak and endothermic area;with the increasing of concentration of CO2 in the reaction atmosphere,the TG curve moved slightly to the high temperature region,the reaction initiation temperatures were always same,and the terminal reaction temperature differd by about 20 ℃.In a high concentration CO2 atmosphere,limestone decomposition followed a random nucleation and subsequent growth model.It provided theoretical support for further optimization of the limestone calcination process and the design of the calciner.
Wenxian Zhang , Liansheng Liu , Hejun Cao , Binke Wu , Zhenpeng Cheng . Effect on kinetics of limestone decomposition under different CO2 atmospheres[J]. Inorganic Chemicals Industry, 2020 , 52(3) : 59 -63 . DOI: 10.11962/1006-4990.2019-0209
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