The effect of impurities on the calcination behaviour of CaCO3 nuggets

Journal of Engineering Research

ARNAB DE¹  PRITHVIRAJ GUPTA²  CHANCHAL BISWAS² 

[1] Indian Institute of Engineering Science and Technology, Shibpur, Howrah- 711103, India;JADAVPUR UNIVERSITY, KOLKATA-700032, INDIA

关键词: Activation energy;    Calcination;    Abrasion index;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Kuwait University * Academic Publication Council

【 摘 要 】

Presence of impurities like SiO­ 2 , Al 2 O 3and MgCO 3affects the calcination behaviour of Limestone in lime kilns. Some research has been carried out to study this effect. The mechanical properties like Shatter and Abrasion index are found to improve slightly with increasing content of impurities. The rate of Calcination gradually reduces with time before attaining saturation, and Interfacial chemical reaction is identified as the rate controlling step.  Activation energy is calculated from the slope of the plot: 1-(1-f) 0.5vs time, where f is the extent of Calcination. Depending on the composition of nuggets, the Activation energy varies between 155.389 and 178.112 kJ/mol. The presence of SiO 2and Al 2 O 3is found to raise the apparent activation energy, E, while the presence of MgCO 3lowers the value of E. The average increase in the apparent activation energy is found to be 2.38 and 1.71 kJ/mol per unit mass % increase in SiO 2and Al 2 O 3respectively and the average decrease in the apparent activation energy is 1.40 kJ/mol per unit mass % increase in MgCO 3 .

【 授权许可】

Unknown