X-ray tomography scan of partially dewatered filter cake
datacite.FundingReference.funderName | Deutsche Forschungsgemeinschaft | |
Contributing person | Technical University Bergakademie Freiberg - Institute of Mechanical Process Engineering and Mineral Processing | |
Contributing person | Löwer, Erik (orcid: 0000-0002-6956-8054) | |
Contributing person | Technical University Bergakademie Freiberg - Institute of Mechanical Process Engineering and Mineral Processing | |
Contributing person | German Research Foundation | |
Contributing person | Leißner, Thomas | |
Contributing person | Peuker, Urs Alexander | |
datacite.description.SeriesInformation | Seven different pore filling grades S1-S7 (=seven pressure steps) | |
datacite.description.TableOfContents | CF_035_055200_014 (in-situ filtration and dewatering, seven different pore filling grades S1-S7, field of view: 4x4 mm²) | |
Documentation of the data | in-situ filtration and dewatering (downscaled pressure nutsch 5 mm diameter) according VDI 2762-2 and VDI 2762-3 Keywords: cake filtration, cake dewatering, X-ray tomography, in-situ, VDI 2762, capillary pressure curve, modelling Resource Type: X-ray tomography scans of partially dewatered filter cake (.tiff stacks) Methods: VDI 2762-1, VDI 2762-2 and VDI 2762-3 Data Processing: automatic centre shift, beam hardening correction (factor 0.05), gauss smoothing filter (kernel 0.7) see note parameter.png in each measurement file for further measurement and reconstruction parameters | |
References to related material | 10.1016/j.seppur.2020.117215 | |
Description of the data | Publication C: Insight into filter cake structures using micro tomography: The dewatering equilibrium(Paper_C) In recent years, non-destructive X-ray microscopy (XRM) has become a common method to characterize particle systems in various scientific fields: Besides the size and shape of particles in bulk powders, the insight into filter cake structures provides additional information about micro processes during filtration and dewatering. Distributed particle properties mainly influence the porous network build-up with possible local deviation in vertical and horizontal alignment. This article focusses on the model-based correlation between the distributed particle properties and characteristic network parameters like tortuosity, pore radii and preferred capillaries for dewatering, using tomography data as model input. Therefore, cake-forming filtration experiments were carried out with a down-scaled, self-constructed in-situ pressure nutsch. The entire tomographic dataset consists of seven individual scans at certain desaturation steps at different pressure levels. For the experiments, a lognormal distributed particle system (crushed Al2O3) in the range of 55 to 200 μm inside an aqueous suspension was used, containing additives for contrast enhancement. Image data processing based on reconstructed 360° projections allows the identification of the background, solid particles and liquid phase by a two-step segmentation. The subsequent modelling uses experimentally verified particle size distributions from laser diffraction measurements (integral value), 2D- (limited number of particles) as well as tomographic analysis, based on calculated single-particle volumes given by the voxel-dataset (all particles within the scanned volume). To characterize the porous network, a developed tetrahedron model is first applied to follow the shortest way through the porous matrix, then again to calculate the widest capillary related to the pore entrance. Furthermore, with information about the pore throat distribution and the wetting line from the tetrahedron side faces, the force balance is evaluated. This results in an entrance pressure distribution, the capillary pressure curve. Experimental data according to VDI 2762 built filter cakes and mercury intrusion tests are taken as reference for validation. | |
Type of the data | Dataset | |
Total size of the dataset | 10333729578 | |
Author | Löwer, Erik | |
Upload date | 2021-08-23T14:02:12Z | |
Upload date | 2026-06-04T14:27:08Z | |
Publication date | 2021-08-23T14:02:12Z | |
Publication date | 2026-06-04T14:27:08Z | |
Data of data creation | 2018 | |
Publication date | 2021-08-23 | |
Abstract of the dataset | X-ray tomography image of a partially dewatered filter cake. The initial slurry contains Al2O3 particles suspended in a potassium iodide-glycerol solution, which were separated by cake-forming filtration with subsequent dewatering. All filtration and dewatering experiments took place in an in situ apparatus within the Zeiss Xradia 510 X-ray microscope. The filter cake is dewatered by gradually increasing the pressure. A scan is taken in the equilibrium state after one pressure step. The data set contains seven pore filling grades S1-S7 (= seven pressure steps). | |
dc.identifier | CF_035_055200_014 S7 | |
dc.identifier | CF_035_055200_014 S4 | |
dc.identifier | CF_035_055200_014 S3 | |
dc.identifier | CF_035_055200_014 S1 | |
dc.identifier | CF_035_055200_014 S2 | |
dc.identifier | CF_035_055200_014 S6 | |
dc.identifier | CF_035_055200_014 S5 | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/2503 | |
Public reference to this page | https://doi.org/10.25532/OPARA-125 | |
dc.language | eng | |
Licence | Attribution 4.0 International | |
URI of the licence text | http://creativecommons.org/licenses/by/4.0/ | |
Specification of the discipline(s) | 4::42::403::403-03 | |
Specification of the discipline(s) | 4 | |
Title of the dataset | X-ray tomography scan of partially dewatered filter cake | |
dc.title.alternative | stepwise filter cake dewatering at different pressures | |
Research instruments | X-ray microscope (ZEISS Xradia Versa 510) | |
Underlying research object | glycerol (manufacturer: Carl Roth, > 99,8 %, 24 m.-%) | |
Underlying research object | potassium iodide (manufacturer: Carl Roth, > 99 %, 25 mmol/l) | |
Underlying research object | gamma-Al2O3 (manufacturer: Almatis, solid powder, 55...200 µm) | |
Software | Xradia XMReconstructor (Version 10.7) | |
Project abstract | Reliable information about the micro-processes during filtration and dewatering of filter cakes allows more accurate statements about process development and design in any industrial application with solid-liquid separation units. Distributed particle properties such as shape, size, and material influence the porous network structure with considerable local fluctuations in vertical and horizontal alignment in the cake forming apparatus. The present work relates to a wide range of particle sizes and particle shapes and presents their effects on integral, but preferably local, structural parameters of cake-forming filtration. Current models for the relationship between particle properties and resulting porous structure remain inaccurate. Therefore, the central question focus on the model-based correlation between the obtained data and characteristic cake and process parameters. In combination with X-ray computed tomography and microscopy (ZEISS Xradia 510), data acquisition on the structural build-up of filter cakes is possible on a small scale (filter area 0.2 cm²) and a conventional laboratory scale (filter area 20 cm², VDI 2762 pressure nutsch). Thereby, the work focuses on structural parameters at the local level before, during, and after cake dewatering, such as porosity, coordination number, three-phase contact angle, characteristics of pores and isolated liquid regions, the liquid load of individual particles, tortuosity, and capillary length, and the corresponding spatial distributions. Seven different particle systems in the range of 20 and 500 µm, suspended in aqueous solutions with additives for contrast enhancement, served as the initial raw materials for the filter cake build-up. Image data processing from 16-bit greyscale images with a resolution of 2 to 4 µm/voxel edge length includes various operations from denoising filters and shape enhancement with two-stage segmentation to identify air, solid particles, and liquid phase, resulting in a machine learning-based automated approach. Subsequent modeling and correlation of measured parameters rely on experimentally verified quantities from mercury porosimetry, laser diffraction, dynamic image analysis, static and dynamic droplet contour analysis, as well as filtration and capillary pressure tests according to VDI guidelines. The tomography measurements provide microscopic information about the porous system, quantified using characteristic key parameters and distribution functions. | |
Project title | Development of process models based on 3D information about the multiphase processes in the pore space of a filter cake (DFG PE 1160/23-1) |
Files
Original bundle
1 - 1 of 1
Loading...
- Name:
- CF_035_055200_014.zip
- Size:
- 9.62 GB
- Format:
- Description:
- CF_035_055200_014 (in-situ flow cell cake filtration, solid fraction 35 vol.-% of Al2O3, 55 µm < x < 200 µm, measurement 014 at seven different saturation levels S1-S7)
Collections
