Analysis of energy requirements in stirred media mills

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http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/3105 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/3105 http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/3105 archive 4031 disk0/00/00/12/25 2010-12-06 16:18:01 2019-01-23 09:53:44 2011-07-19 16:31:31 thesis show 0 Tamblyn Richard John Rowson Neil Greenwood Richard University of Birmingham Analysis of energy requirements in stirred media mills unpub TP 10col_ephy Vertically stirred media mills represent an important tool for the comminution of a range of industrial minerals. In this work, calcium carbonate is ground to size ranges below 2 μm in an Imerys stirred media mill. The role of grinding media on the efficiency is considered, and with the use of a novel, rod shaped grinding media, significant energy savings in ultrafine wet grinding are seen. This is proven to be an effect attributable to the shape of the grinding media, rather than the density of the grinding media. After a comprehensive efficiency analysis of the performance of a range of spherical and rod shaped media, further investigations are made through analysis of flow patterns within the mill using Positron Emission Particle Tracking (PEPT). Data collected from PEPT has given new insights into the distribution of material and kinetic energy within the mill, as well as an understanding of the effect of media density and motor speed in relation to the efficiency of the grinding. Furthermore, investigations are made into dry grinding of talc using the stirred media mill, which is subsequently soaked in water to give a low energy route to high surface area of the mineral. 2009-12-11 2009-08 graduation 2866194 eng author unchecked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. public 192 University of Birmingham School of Chemical Engineering d_en na 2009-12-11 graduation