Application of Statistical Tests to Analyze Results of Chalcopyrite Particles Produced by Different Milling

This paper presents a statistical evaluation for the shape parameters of different mill products for chalcopyrite mineral. The aim of this study was to determine the effect of grinding mechanisms on chalcopyrite shape properties. Image Analysis (IA) method was used to determine shape factors of chalcopyrite particles. The shape characters are stated in terms of shape factors such as aspect ratio، circularity، roundness، convexity and regularity factors. Applying analysis of variance (one way ANOVA) method followed by multiple comparison tests could show whether the shape parameters of the three different mill products were statistically different from each other or not. Statistical studies were performed using the SPSS software and obtained results showed that with a 95% confidence level، the difference between the shape properties of particles produced by different mill are significant and different grinding mechanism in rod mill، ball mill and ceramic ball mill affects the shape properties of particles. Increasing the role of attrition in grinding increases the circularity، convexity and roundness of particles so the ceramic ball mill makes circular particles and rod mill makes elongated particles.