Multistep centrifugal consolidation method for characterization of filterability of aggregated concentrated suspensions
2017
Loginov, Maksym | Zierau, Anne | Kavianpour, Davood | Lerche, Dietmar | Vorobiev, Eugene | Gesan-Guiziou, Genevieve | Mahnic-Kalamiza, Samo | Sobisch, Titus
Current development of analytical centrifugation methods facilitates the experimental characterizationof dispersion stability and optimization of separation processes (such as centrifugation and filtration).Nevertheless, theoretical analysis of the centrifugal data remains rather complex. In addition, differentside effects can influence the centrifugal process and complicate data interpretation.The present paper proposes a simple method for characterization of filterability of concentrated aggregatedsuspensions by centrifugal consolidation. Different experimental protocols were tested in order toreduce the influence of side effects. Selection of the optimal protocol was based on X-ray analysis of local(spatially resolved) consolidated sample structure. The multistep centrifugal consolidation with constantcentrifugal acceleration ratio is suggested. Data analysis based on a single numerical solution of a basicconsolidation equation yields the pressure dependency of specific cake resistance. A satisfactory correspondence(15% difference) was observed between the pressure dependency of specific cake resistancedetermined from the proposed multistep centrifugal consolidation, and conventional constant pressuredead-end filtration experiments for the studied concentrated aggregated kaolin suspension in the pressurerange of 7.5. . .170 kPa.
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