| Abstract | Free lime content (f-CaO) in cement clinker is a crucial determinant of product quality in rotary kilns. Accurate, real-time estimation of this parameter can significantly improve product quality and energy efficiency during production. While machine learning (ML) has shown promise for such predictive tasks, previous studies have primarily focused on predicting free lime content as a percentage, often resulting in high mean squared errors (MSE) and low R² values, making these approaches impractical for cement plants. This study developed and evaluated eight regression models, including a deep neural network model. The highest R² value of 0.39 was achieved using Support Vector Regression (SVR), while the lowest MSE of 0.08 was obtained with the deep neural network. However, these regression models did not meet the required confidence levels, prompting a shift to classification models. Subsequently, ten classification-based ML models were developed, evaluated, and compared, with Support Vector Machine with Radial Kernel (SVM R) emerging as the best performer, achieving an accuracy of 0.85 and an AUC of 0.91. These findings suggest that a robust classification-based ML model can be developed for predicting cement clinker quality |
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