Insight into filter cake structures using micro tomography: The dewatering equilibrium

Leißner, Thomas; Peuker, Urs A.

doi:10.1016/j.seppur.2020.117215

Cited by 11 publications

(6 citation statements)

References 62 publications

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“…Die Permeabilita ¨t eines poro ¨sen Systems ist ein wichtiger Strukturparameter [25]. Spezifischer Filterkuchenwiderstand des ebenen Referenzfilterkuchens und Filtermediumwiderstand betragen r c = 6 Á 10 12 m -2 und R m = 2 Á 10 10 m -1 .…”

Section: Globale Strukturparameterunclassified

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Experimental Method Development for the Formation of Filter Cakes with Inhomogeneous Cake Geometry

Sauer,

Henn,

Peuker

et al. 2024

Chemie Ingenieur Technik

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Filteruchen bilden sich in industriellen Prozessen häufig mit ungleichmäßiger Kuchenhöhe. Dies kann den Erfolg anschließender Prozessschritte, z. B. der Filterkuchenwäsche oder der mechanischen Entfeuchtung, wesentlich beeinflussen. Um den Einfluss der Kuchengeometrie systematisch untersuchen zu können, muss eine Methode zur reproduzierbaren Bildung von Filterkuchen mit inhomogener Kuchengeometrie entwickelt werden. Gleichzeitig ist sicherzustellen, dass keine anderen Inhomogenitäten wie z. B. Strukturveränderungen auftreten. Es werden zwei experimentelle Methoden vorgestellt, welche eine Bildung von Filterkuchen mit inhomogener Geometrie ermöglichen. Vier inhomogene Kuchengeometrien werden untersucht. Die Kuchenstruktur der so gebildeten Filterkuchen ist mit der Kuchenstruktur eines ebenen Referenzfilterkuchens vergleichbar und wird nicht durch die beiden Methoden beeinflusst.

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Section: Globale Strukturparameterunclassified

“…Die Anwendung eines berührungslosen Messverfahrens bietet Ansatzpunkte für zukünftige Untersuchungen, wie z. B. eine zerstörungsfreie Strukturmessung mittels Mikro‐Computertomographie 10, 25.…”

Section: Ergebnisseunclassified

Experimental Method Development for the Formation of Filter Cakes with Inhomogeneous Cake Geometry

Sauer,

Henn,

Peuker

et al. 2024

Chemie Ingenieur Technik

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“…Data stitching of several individual scans covering certain areas of the filter cakes should be avoided in order to keep scanning time to a minimum, which in effect reduces drying and shrinking of the cake structures [21]. With an appropriate FOV, the individual particles, whose sizes are usually in the µm range, cannot be resolved unless the size of the test apparatus itself is adjusted under certain assumptions [22]. In this case, however, it must be ensured that the experiment can be transferred to a smaller scale without the loss of information.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Separated Impurities inside Filter Cakes with Phantom-Aided X-ray Tomography

et al. 2023

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This study presents a new approach in the quantification of the deposited amount of impurity inside a filter cake made up of filter aid material. For this purpose, three-dimensional imaging by X-ray tomography is applied. Based on the X-ray attenuation properties, a model system consisting of kieselguhr as filter aid and barium sulphate as impurity is chosen. Due to the impurity particle size being smaller than the spatial resolution of the measuring setup, a calibration approach is necessary to gain insight into subvoxel information. A so-called phantom of similar material composition is prepared. The grey values are linearly correlated with the impurity volume fraction resulting in a calibration function, which facilitates the calculation of impurity volume fraction based on grey values measured inside the filter cake. First results are presented, showing that the approach delivers valid results for the chosen material system and reveals unexpected characteristics of the filter cake structure. Challenges in the context of the phantom approach and their influence on the obtained results are discussed.

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“…While the properties required for the filter medium and the operating parameters for the filter apparatus are sufficiently well known, the transition from a laboratory scale to larger industrially relevant scales has not been achieved, even at the present time [5][6][7]. In gas differential pressure deliquoring, the liquid present in the pore system of the filter cake is removed after overcoming the inlet capillary pressure, but for fine-grained cohesive particle systems, emptied pores and cracks in the filter cake occur and lead to an undesired gas throughput [8][9][10]. Figure 1 schematically shows the difference between filter cake deliquoring with gas throughput using fabric as a filter medium (Figure 1a) and filter cake deliquoring without gas throughput using emptied pores and cracks in the filter cake occur and lead to an undesired gas throughput [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Membrane–Fabric Composite Filter Media for Continuous Cake Filtration without Gas Throughput Using Paste Dot Coating with Adhesive

Benz,

Krull,

Nikolaus

et al. 2023

Membranes

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In the field of liquid filtration, the realization of gas throughput-free cake filtration has been investigated for a long time. Cake filtration without gas throughput would lead to energy savings in general and would reduce the mechanically achievable residual moisture in filter cakes in particular. The reason why gas throughput-free filtration could not be realized with fabrics so far is that the achievable pore sizes are not small enough, and that the associated capillary pressure is too low for gas throughput-free filtration. Microporous membranes can prevent gas flow through open pores and cracks in the filter cake at a standard differential pressure for cake filtration of 0.8 bar due to their smaller pore size. Since large-scale implementation with membranes was not yet successful due to their inadequate mechanical strength, this work focuses on the development and testing of a novel composite material. It combines the advantages of gas throughput-free filtration using membranes with the mechanical stability of fabrics. For the production of the composites, a paste dot coating with adhesive, which is a common method in the textile industry, was used. Based on filtration experiments, delamination and tensile tests, as well as µCT analysis, it is shown that this method is suitable for the production of composite filter materials for gas throughput-free cake filtration.

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Insight into filter cake structures using micro tomography: The dewatering equilibrium

Cited by 11 publications

References 62 publications

Experimental Method Development for the Formation of Filter Cakes with Inhomogeneous Cake Geometry

Experimental Method Development for the Formation of Filter Cakes with Inhomogeneous Cake Geometry

Quantitative Analysis of Separated Impurities inside Filter Cakes with Phantom-Aided X-ray Tomography

Membrane–Fabric Composite Filter Media for Continuous Cake Filtration without Gas Throughput Using Paste Dot Coating with Adhesive

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