The Effects of Additives in Wet Ultrafine Grinding in Stirred Media Mill

摘要

In wet, ultrafine grinding, the increasing fineness of the product causes substantial changes in the suspension viscosity. Stabilizing the suspension (by adding liquefiers) can improve the energy utilization in the range of high solid concentrations (c_v>0.2). For the same target fineness either considerable energy savings are possible or with the same specific energy much finer products can be obtained. The increase in the solids concentration has a beneficial effect both for the mill throughput and the wear on the grinding media. The extent of the effects of additives in wet grinding is determined by: the solids concentration, particle size and stress intensity and the percentage of the viscosity-related energy losses in the total energy consumption. The particle interactions in the starting state was well as impurities in the product or as a result of the abrasion of grinding media and grinding chamber walls, which can cause the particle interactions to change in the course of the grinding process, also have a critical influence. The tests were conducted with a laboratory-scale stirred media mill with two model substances, limestone and corundum.