Scaling-up of Ceramic Body Grinding withReference to the Rate of Grinding

摘要

Results of experiments carried out in a pilot-plant ball mill are discussed in the paper. The objectiveof the experiments was to determine the effect of the number of contact points between grindingmedia on the rate of grinding. The experimental material was ceramic body used in the productionof floor and wall tiles. The feed was subjected to wet grinding. During grinding the rate ofcomminution of particular size fractions was determined. Changes in particle size distribution ofground material in time were analysed and the effect of ball size, mill filling with the feed and thenumber of grinding media on the process rate was described. The rate varied during the grindingprocess and the effect of the above factors was different in subsequent periods of the process.Basing on the particle size analysis, the percentage of each size fraction was specified for timeintervals given in the experimental procedure. The change in time of the particle size compositionenabled a calculation of the grinding rate of particular fractions. In the calculations Gardner andAustin differential equation was used for discrete values of fractions.