Energy and cement quality optimization of a cement grinding circuit

• Published in: Advanced powder technology : the international journal of the Society of Powder Technology, Japan Japan, 2018-07, Vol.29 (7), p.1713-1723
• Main Author: Altun, Okay
• Format: Article
• Language: English
• Subjects: Cement; Comminution; Grinding; Modelling; Optimization
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2018.04.006

Modified circuit flow sheet and the prediction accuracy of the simulation studies. As a result, the actual production rate and 28-Days strength increased by 3.7%, 2.9% respectively. [Display omitted] •Systematic optimization of the grinding circuit was undertaken.•Initially the simulation studies and then the validation studies were undertaken.•Both the energy and product specifications were improved.•Energy utilization of the cement grinding circuit was improved by 4.3%. This study aimed at optimizing both the energy efficiency and the quality of the end product by modifying the existing flowsheet of the cement grinding circuit. As a general application, mill filter stream is sent to the air classifier owing to its coarser size distribution than the desired product. However, the study proved that some further evaluations i.e., quality tests and chemical assays, could make it possible to treat this stream as a final product. Consequently, directing this stream to the final product silo could be considered. Within the study, sampling survey was undertaken initially that was followed by the modelling and simulation works. The calculations implied that the production rate increased by 4.45% that corresponded to energy saving of 4.26%. As the plant decided to change the flow sheet, another sampling campaign was arranged to validate the outputs of the simulation studies. In that case, the real data showed that the increase in production rate was 3.68% and 28-Days strength of the cement improved by 2.9%. As a result, the simulation outputs were found to be in agreement with the real data hence the efficiency of the cement production, both quality and energy, for a given circuit was improved.