An Energy Based Comparison of Vertical Roller Mills and Tumbling Mills

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ESCC 2013

Abstract

The Institute of Mineral Processing at the Montanuniversitaet Leoben in cooperation with the company CEMTEC has developed a pilot scale, 200mm table diameter, vertical roller mill for energy controlled laboratory tests. The mill provides the technical options to vary process parameters like air-­‐flow, throughput-­‐massflow, grinding force and    classifier    speed    in    a    wide    range    and    is    equipped    to    analyze    the    internal    circulating    load. The main points of interest during the last three years of research activity were put on the basic process interactions, upscaling and comminution efficiency in general. In order to address grinding efficiency (expressed as the increase in mass specific surface vs. net specific energy input) the energy consumption of two pilot scale vertical roller mills (200 mm and 670 mm table diameter) was compared to a sequence of laboratory comminution equipment covering the same size range. The sequence consisting of a laboratory jaw crusher and three laboratory tumbling mills (rod, ball mill and cylpeb mill) was operated following the principles of energy optimized comminution according to the OCS-­‐method. The results for calcite and siderite are presented. The methods used are outlined including the special features of the equipment.

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