Enhanced expression of filter cakes using a local thermal supply

Couturier, Stéphane; Valat, Marc; Vaxelaire, Jean; Puiggali, Jean‐Rodolphe

doi:10.1016/j.seppur.2007.04.020

Cited by 25 publications

(11 citation statements)

References 23 publications

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“…The absence of wall effect on the filterability was again estimated for this smaller cell and is presented in section 5.1. The filterability test was based on experiments described by Roorda and van der Graaf (Roorda and van der Graaf 2005) and by Couturier, Valat et al (Couturier, Valat et al 2007).…”

Section: Filtration Set-up and Operating Conditionsmentioning

confidence: 99%

Influence of particle size and shape properties on cake resistance and compressibility during pressure filtration

Bourcier

Feraud

Colson

et al. 2016

Chemical Engineering Science

100

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International audienceThe aim of this paper was to study cake filterability and compressibility as a function of the particle shape and particle size distribution (PSD). Different shapes and PSD of calcium carbonate and uranium oxalate particles covering the classical types encountered in industry (sphere, cube, needle and platelet) were obtained by precipitation. The size and shape factor distributions were measured using an image analysis system on SEM pictures. The cake filtration properties were measured in ideal monitored operating conditions, because of a miniaturised filtration cell set-up. The impact of the PSD and the shape were quantitatively assessed. These two solid features have an impact on cake resistance and compressibility, but not in the same way. The PSD has the strongest effect on cake resistance and compressibility. The particle shape is a decisive parameter for cake compressibility when the shape is far from the sphere. Both parameters need to be considered when working on the development of a filtration operation. Here, a practical model built following the Darcy law coupled with a new correlation for compressibility factor assessment is proposed. It gave satisfactory estimates of cake filterability and compressibility for the four shapes studied

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Section: Filtration Set-up and Operating Conditionsmentioning

confidence: 99%

Influence of particle size and shape properties on cake resistance and compressibility during pressure filtration

Bourcier

Feraud

Colson

et al. 2016

Chemical Engineering Science

100

View full text Add to dashboard Cite

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“…In the field of coal dewatering, steam pressure filtration has been studied by, among others, Gerl and Stahl [5], Bongers et al [6] and Chen et al [7]. Thermally assisted mechanical dewatering (TAMD) with heating elements installed in the filter chamber has been studied by Couturier et al [8], Mahmoud et al [9], and Chantoiseau and Arlabosse [10]. Additionally, Bott and Langeloh [11] have detailed commercial steam-assisted hyperbaric disc and drum filters.…”

Section: Symbols and Abbreviationsmentioning

confidence: 99%

Steam Dewatering of Filter Cakes in a Vertical Filter Press

2013

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Steam dewatering of filter cakes is recognized as a competitive alternative to conventional air drying and thermally assisted mechanical dewatering (TAMD). The main benefit of cake dewatering with high-pressure steam is that mechanical and thermal dewatering can be efficiently performed in a single process step. The target of this study was to determine the potential of a steam dewatering technique for two industrial mineral suspensions. The first mineral, kaolin, was very difficult to dewater using conventional mechanical dewatering techniques, whereas the second one, ground calcium carbonate (GCC), represented only moderate resistance to filtration. The secondary objective was to compare the filterability of the original kaolin slurry with the same slurry treated with a coagulant (aluminium sulphate, Al2(SO4)3  16H2O). Four different kinds of experiments were performed; tests without any kind of cake dewatering, tests with air drying, tests with steam drying, and tests with both coagulation and steam drying. The obtained results show that steam dewatering is an efficient technique for achieving lower cake moisture contents. Also, the positive influence of coagulation on the filtration capacity was found to be considerable in the case of kaolin. An approximate energy balance was created for the steam drying process and the determined energy efficiencies were compared with those obtainable with an ideal thermal drier. The main conclusion from these comparisons is that steam drying can be effectively used instead of traditional thermal drying, if the large energy losses can be reduced by proper insulation and heat recovery systems.

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“…However the efficiencies obtained with wastewater sludge are generally low, a 35% (wt%) dryness seems to be around the highest value that can be reached (Chen et al, 2002;Raynaud et al, 2012). Consequently, for some years, researchers have started to intensify the existing mechanical processes by realizing convenient combinations, such as the addition of a thermal field, an acoustic field or an electric field (Smythe and Wakeman, 2000;Clayton et al, 2006;Couturier et al, 2007;Mahmoud et al, 2008Mahmoud et al, , 2010Mahmoud et al, , 2013Peteers, 2010;Tuan et al, 2012;Iwata et al, 2013). One of the most effective hybrid processes with regards to the improvement of wastewater sludge dewatering is electro-dewatering (EDW) which is the application of an electric field during the mechanical compression of the sludge (Mahmoud et al, 2010(Mahmoud et al, , 2011(Mahmoud et al, , 2013Tuan et al, 2012;Iwata et al, 2013;Olivier et al, 2014).…”

Section: Introductionmentioning

confidence: 99%