Wetting and its influence on the filtration ability of ceramic foam filters--颗粒学报PARTICUOLOGY

Heuzeroth, F., Fritzsche, J., & Peuker, U. A. (2015). Wetting and its influence on the filtration ability of ceramic foam filters. Particuology, 18, 50–57. https://doi.org/10.1016/j.partic.2014.06.001

Wetting and its influence on the filtration ability of ceramic foam filters

Fabian Heuzeroth^*, Jörg Fritzsche, Urs A. Peuker

Institute of Mechanical Process Engineering and Mineral Processing, Agricolastraße 1, 09599 Freiberg, Germany

10.1016/j.partic.2014.06.001

Volume 18, February 2015, Pages 50-57

Received 15 April 2014, Revised 16 May 2014, Accepted 3 June 2014, Available online 3 September 2014.

E-mail: Fabian.Heuzeroth@mvtat.tu-freiberg.de

Highlights

• Atomic force microscope enables the measurement of adhesion energies between rough solids.

• Adhesion energy between solid surfaces depends on their wetting behavior toward the fluid.

• The Hiller number describes the probability of particle adhesion.

• Poor wetting of particles with the surrounding fluid increases filtration efficiency.

Abstract

Deep bed filtration in aqueous media is a well-known process for solid–liquid separation. However, the use of deep bed filtration for the purification of metal melts is a relatively new field of application. In particular, the separation mechanism of metal melts filtration is a new area for investigation. The current paper aims at examining the influence of wetting on the filtration efficiency of ceramic foam filters that is an important feature of the metal melts filtration process. A model system was designed using water and alumina particles (<200 μm). The particles and filter medium were coated to model poor wetting. Thus, examination of the influence of wetting on the adhesion energy and filtration performance was possible. Furthermore, the effect of fluid velocity was studied. To this end, the experiments were carried out under atmospheric conditions and at 20 °C. The findings showed that poor wetting between the fluid and solid phase significantly increased the filtration efficiency.

Graphical abstract

Keywords

Deep bed filtration; Adhesion energy; Atomic force microscopy; Wetting

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