Optimization of Wet Grinding Parameters of Calcite Ore in Stirred Ball Mill

Abstract

This study focused on ultra-fine grinding of calcite powder (CaCO 3) using a vertical stirred ball mill. The influences of various operating parameters such as stirrer speed (rpm), ball filling ratio (J), powder filling ratio (fc), solid ratio (wt.%) and grinding time were studied under wet conditions. The experiments were carried out in a batch mode of operation. The experimental results were evaluated based upon product size (d 50), specific surface area (m 2 /g) and width of particle size distribution. As a result of this work, the optimum grinding test conditions were found to be 840 rpm for stirrer speed, 0.70 for ball filling ratio, 0.100 for powder filling ratio, 50% for solid ratio and 20 min for grinding time. It was also observed that stirrer speed, ball filling ratio and grinding time were directly proportional whereas powder filling ratio and solid ratio were inversely proportional to product fineness and specific surface area. The width of particle size distribution decreased with decreasing product size for all grinding conditions.

Utilization of wastes/by-products as a grinding additive

“…On the other hand, some sources from the literature confirm that water can indeed increase grinding efficiencies (Parks, 1984;Sohoni et al, 1991;Sverak et al, 2013;Çayırlı, 2014;Toraman et al, 2016;Prziwara and Kwade, 2020). As is commonly known, water molecules have a significant polar attraction, which results in relatively strong affinities for polar regions on the solid surface, similar to the polar functional groups found in conventional grinding additive molecules, hence lowering intergranular adhesion forces (Prziwara et al, 2018;Prziwara and Kwade, 2020).…”