Abstract
A vertical mill platform for inner circulation is constructed to improve the grinding efficiency. A transparent plexiglass grinding chamber is utilized to study the influence of solids density, particle size, solid volume fraction and agitator speed on the variation and transition of flow pattern regimes. The change regulations of rotor speed to just circulation and complete circulation as well as system energy consumption are analyzed, the empirical correlations for predicting the rotor speed to just circulation and complete circulation are proposed based on the experimental data of particles-liquid mixtures. The results indicate that the flow of particles-liquid mixture shows four different flow patterns with the increase of the agitator speed. In addition, the process of transition between flow patterns is different when the volume fraction of particles is lower or higher than 20%. The just circulation speed and the complete circulation speed of particles increase as the volume fraction of particles increases. The total system power consumption increases slowly when the volume fraction of particles is lower than 40%; but it increases sharply if the solid volume fraction exceeds 40%.
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