13 - 15 October 13 - 15 Wiesbaden Germany
sedimentation and consolidation behaviour of Flocculated Dispersions Characterized by different methods measuring transmission
T. Sobisch1, A. Zierau1, A. Bjeoumikov2, M. Holke³, D. Lerche1
During technical application and during solid-liquid separation dispersions are often flocculated. While during application sedimentation and consolidation usually have to be avoided or minimized, for solid-liquid separation these are essential. In both cases there is a need for fast reliable methods for comprehensive characterization of these processes.
Space and time resolved photometric methods using near infrared (NIR) light are well suited to measure kinetics of sedimentation and clarification. Using X-rays additional information on concentration profiles in sediments and highly concentrated suspensions can be obtained. Therefore photometric and X-ray measurements can ideally complement each other.
Investigations on sedimentation and consolidation behaviour of flocculated polydisperse quartz suspensions are presented. These were carried out at normal earth gravity as function of flocculant concentration using both transmission measurements with NIR light and X-rays. This was followed by measurement of the compressional behaviour of the sediments formed at earth gravity. To this end multisample analytical centrifugation with photometric detection was used. After dewatering of the sediments in the centrifugal field the space resolved distribution of packing density inside the sediments was determined measuring X-ray transmission.
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