(70bl) A study on G/D optimization of a centrifugal mill by the particle size of product

A centrifugal mill is a high-power intensity media mill that can be used for ultra-fine grinding. The mill charge motions and the combination of normal/sheer forces are different depending on the ratio of the gyration diameter to the mill diameter (G/D). In this study, a new type of centrifugal mill was constructed with an arrangement that allowed for adjustment of the eccentricity and the rotation speeds. This new mill can be used for vibratory, centrifugal and planetary milling. The objectives of this study were to investigate the mill performance at various degrees of grinding and to identify operating conditions which favor different breakage mechanisms. To this end, batch grinding tests were conducted on silica particles for prolonged grinding times with product fineness down to submicron sizes at various G/D ratios and rotation speeds. Test results were evaluated in terms of grinding time and energy consumption for required fineness of grinding product.