Centrifugal tube mill for finest grinding

Abstract

The design and the motion behaviour of the filling of a new centrifugal tube mill are introduced. In contrast to the usual range of application for centrifugal tube mills, once developed to substitute ball mills, it is shown that centrifugal tube mills are particularly suited for pulverizing if the grinding media filling is reduced to max. 35%. This measure also reduced the connected load by up to 50%. Based on a developed mechanical model, it is possible to calculate the energy consumption in advance. The throughput, energy demand and maximum solid volume fraction regarding the particle size distribution are determined with the help of crushing tests on limestone and quartz. The resulting energy density of approx. 0.2 kW/l places the machine in the category of slow stirred media mills. The main advantage of the centrifugal tube mill is seen in the renunciation of agitators, trouble-free suspension discharge as well as the renunciation of cooling devices. Mentioned examples for a successful application of the centrifugal tube mill, available in an industrial scale size, are the milling of asbestos waste, anthracites, organic pigments and silicon carbides and nitrides.