April 10-13, 2005 Atlanta, Georgia
presentation
Tracing the centrifugal separation of fine-particle slurries
Effect of centrifugal acceleration, particle interaction and concentration
T. Sobisch, D. Lerche, L.U.M. GmbH, Berlin, www.lum-gmbh.com, info@lum-gmbh.de
M. Beiser, A. Erk, Institut für Mechanische Verfahrenstechnik und Mechanik, Universität Karlsruhe (TH)
Unit processes using centrifugal fields are often applied for separation and classification of fine grained materials. Modeling of these processes requires information about the separation behaviour of the suspensions to be processed. To this end direct measurements in centrifuges are obligatory. Moreover, these measurements have to gather kinetic information as function of the processing conditions, particle interaction and particle concentration.
As a first step in this direction the separation behaviour of quartz (stable dispersions) and limestone suspensions (weakly and strongly flocculated) was investigated as function of solid concentration and centrifugal acceleration (11 – 1100 x g) using a multisample analytical centrifuge.
Particle interactions are characterized by determination of the packing density obtained under controlled conditions and by its variations under alternating centrifugal load.
Results of analytical centrifugation are compared with the separation behaviour under normal gravity and with the results traced by a centrifuge with manometric detection and by a disc centrifuge.
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