Computational Filterability and dewatering determination based on shape and size distribution of solid suspensions

Abstract : Dewatering after filtration is an important issue, as it determines the transferability and the final cost of dewatering for the product. Any optimization in the dewatering step will improve the process. This paper shows the effect of particle properties such as shape factor and size distribution on dewatering efficiency. An experimental plan was established to show the influence of the working pressures (filtration and dewatering pressures) on residual moisture and dewatering time. This plan was repeated on four calcium carbonate particle shapes: needles, plates, spheres, and cubes. The first data from these experiments showed that the volume shape factor of the particle has no effect on cake behavior during dewatering. The same-shaped iso-response curves of residual moisture as a function of the filtration pressure and the dewatering pressure were obtained for each particle shape. It was also shown that raising the dewatering pressure can in fact lead to a wetter cake if this pressure is higher than the cake filtration pressure. This fact points out a counterproductive phenomenon that the industrial operator has to avoid. The experimental considerations were compared to a model for dewatering based on work by Tarleton and Wakeman combined with a specially-developed filtration model. This combination enabled the computation of cake resistance and compressibility, as well as cake dewatering behavior, using easily measurable parameters. It can serve the industrial process in the choice of the appropriate liquid-solid separation device, and provide information as to the pressure conditions necessary to obtain the wettest cake possible for a time-fixed dewatering or to see if a wet target can be reached and in how much time.
Type de document :
Communication dans un congrès
12th World Filtration Congress (WFC12), Apr 2016, Taipei, Taiwan. 〈http://www.wfc12.tw/about.html〉
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https://hal.archives-ouvertes.fr/hal-01820512
Contributeur : Barbara Malinowska <>
Soumis le : jeudi 21 juin 2018 - 17:30:08
Dernière modification le : jeudi 7 février 2019 - 16:41:40
Document(s) archivé(s) le : mardi 25 septembre 2018 - 22:42:30

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  • HAL Id : hal-01820512, version 1

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Danièle Bourcier, J.P Féraud, D. Ode, D Colson, François Puel. Computational Filterability and dewatering determination based on shape and size distribution of solid suspensions. 12th World Filtration Congress (WFC12), Apr 2016, Taipei, Taiwan. 〈http://www.wfc12.tw/about.html〉. 〈hal-01820512〉

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