Investigation of coating effect on filter cake characteristics

M. Brockmann*, T. Lei├čner, U. A. Peuker, Technical University Bergakademie Freiberg, Germany

In this work, we focused on the filtration of two particulate materials different in particle shape to investigate the effect of particle shape and coating on the filter cake characteristics. To study the shape and coating effect, we choose Al2O3 and wollastonite powder in a similar particle size distribution range. The Al2O3 powder represents the spherical particles used in this research, and for the case of needle-like particles, we applied Wollastonite. To hydrophobize the particle surface, we implemented Silane Octeo for coating.

As the filtration starts, an observable difference can be noticed in the filter cake building time. As Ethanol increases, the cake building time decreases. Interestingly, the cake building time remains as a function of the Ethanol proportion in the solution.
Noticeably, with an increase in the amount of ethanol volume, we get a significant decrease in porosity for both particle shapes, for the coated Al2O3 and coated Wollastonite. The decreased amount of the porosity is in strong relation to the change of the surface tension and wetting properties. As the ethanol increases...

Session: L3 - Cake Filtration - Influences on the Cake Structure
Day: 22 October 2019
Time: 16:45 - 18:00 h

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