Developing relationships among grindability, chemical composition and particle size of raw material mix at Aruwakkalu Limestone for Cement Production

Abstract

In this research study, the relationship among chemical constituents (SiO2, Al2O3, Fe2O3, CaO, MgO, Cl-, SO3, Na2O and K2O) and raw meal grindability are investigated on raw meal samples taken from the output of ball mill. The X - ray Fluorescence analysis is used to check the chemical composition and grindability is checked in the form of residue test of No 212 sieve residue. The distribution curves of the variables were analyzed to examine the skewness of the distribution. The Pearson’s Coefficient of Correlation analysis was performed on each two variables to identify any linear mathematical relationship between variables. The time series analysis was carried out to find the best fitting curve between grindability and the variables. Scatter plot analysis was finally performed and the results show the effect of chemical components and particle size distribution of raw meal were found to be range correlated on the raw meal grindability. The most suitable chemical constituent range to improve the grindability of raw meal are given based on 68% , 95% and 99% confidence intervals. The quality parameters such as Lime Saturation Factor, Alumina Ratio and Silica Ratio also evaluated based on chemical constituent values of 68%, 95% and 99% confidence intervals.