ANALYSIS OF INDUSTRIAL DRUM MILLS' OPERATION AND WAYS OF THEIR IMPROVEMENT

There has been done the analysis of existing industrial drum mills, which has permitted to reveal their design imperfection. In order to increase the intensity of heterogeneous processes, it is proposed to aim at increasing the surface of contacting phases, involved in the process. For this purpose, it is necessary to combine such processes as grinding, activation, classification, mixing and chemical synthesis in the grinding device, which enables to intensify the subsequent operations for processing of dispersed compositions.The efficiency of mill operation in a closed cycle can be further improved, if to provide a highly efficient classification of ground products, removed from the mill. It is proposed to divide the whole drum of the mill along its length by lattice partitions into a large number of chambers, with a certain distance between the chambers of about 1,5 divided by 2 meters; to install two lattice partitions between the chambers, with a distances of 0,25 divided by 0,4 meters between the partitions; to fix the blades to the drum wall in the space between the partitions, similar to the drum dryer. It is recommended that in order to reduce energy costs, there should be provided a rational organization of the grinding process with optimal process conditions for industrial mills, applied in cement milling, with the air speed in the free drum space having to be within 0,7 divided by 1,4 m/sec.