Screening of Colloids by Semicontinuous Centrifugation

Abstract

This work contributes to the field of solid-liquid separation in focusing on the screening of colloidal particles in a semicontinuous process. The aim of the study is to provide the basics for a continuous classification process in industry. After a short introduction to the field of particle screening, a review of the possibilities of classification in the gas or liquid phase is presented, including analytical methods, devices for the fractionation on the laboratory scale as well as apparatus for screening on the pilot and industrial scale. The results show the dispersion, stabilization and classification of fine kaolin and polystyrene particles. Kaolin was used to demonstrate the possibility of removing the fraction of fine particles, polystyrene particles were used to investigate the removal of the coarse fraction. The diameter of the particles used in this study ranges from 250 nm to 3 lm.

Pseudo two‐dimensional modeling of sediment build‐up in centrifuges: A compartment approach using compressional rheology

“…This has been validated with experiments. 36 The relative deviation of the predicted and experimentally determined reduction of the fine fraction equals 13.2%.…”

Evaluation of Separation Efficiency in a Tubular Bowl Centrifuge

“…Among all the centrifuges, tubular bowl centrifuges (TBCs) are often preferred in order to achieve higher separation efficiencies owing to thus high settling velocity and G-force when operated at high speeds, even for reasonably larger feed rates and higher feed concentrations [5,6]. When the difference between the densities of solid and liquid phases is rather small, TBCs are used as a tool to determine the particle cut-off size in the sub-micrometer range [7,8].…”

Soft Sensor Development for Real-Time Process Monitoring of Multidimensional Fractionation in Tubular Centrifuges

“…Remarkable separation qualities have been recorded in the literature as a result of using advanced methods such as density gradient centrifugation [ 26 , 27 , 28 , 29 ]. Disadvantages of these single batch procedures, however, are limitations in large scale application as well as the fact that they sacrifice high throughput and cost efficiency for product purity in small batch sizes [ 30 , 31 , 32 ].…”