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X-ray tomography scan of partially dewatered filter cake
Subtitle: stepwise filter cake dewatering at different pressures
Metadata
| Additional title | Subtitle: stepwise filter cake dewatering at different pressures | |
| Alternative existing references for this dataset | CF_035_055200_014 S1 | |
| Alternative existing references for this dataset | CF_035_055200_014 S2 | |
| Alternative existing references for this dataset | CF_035_055200_014 S3 | |
| Alternative existing references for this dataset | CF_035_055200_014 S4 | |
| Alternative existing references for this dataset | CF_035_055200_014 S5 | |
| Alternative existing references for this dataset | CF_035_055200_014 S6 | |
| Alternative existing references for this dataset | CF_035_055200_014 S7 | |
| Other contributing persons, institutions or organisations | Peuker, Urs Alexander - Technical University Bergakademie Freiberg - Institute of Mechanical Process Engineering and Mineral Processing - Supervisor | |
| Other contributing persons, institutions or organisations | Leißner, Thomas - Technical University Bergakademie Freiberg - Institute of Mechanical Process Engineering and Mineral Processing - Supervisor | |
| Other contributing persons, institutions or organisations | German Research Foundation - Sponsor | |
| Person(s) who is (are) responsible for the content of the research data | Löwer, Erik - Technical University Bergakademie Freiberg - Institute of Mechanical Process Engineering and Mineral Processing (ORCID: 0000-0002-6956-8054) | |
| Description of further data processing | automatic centre shift, beam hardening correction (factor 0.05), gauss smoothing filter (kernel 0.7) | |
| Type of data acquisition | Experiment: in-situ filtration and dewatering (downscaled pressure nutsch 5 mm diameter) according VDI 2762-2 and VDI 2762-3 | |
| Used research instruments or devices | X-ray microscope (ZEISS Xradia Versa 510) | |
| Research objects | Substance: glycerol (manufacturer: Carl Roth, > 99,8 %, 24 m.-%) | |
| Research objects | Substance: potassium iodide (manufacturer: Carl Roth, > 99 %, 25 mmol/l) | |
| Research objects | Substance: gamma-Al2O3 (manufacturer: Almatis, solid powder, 55...200 µm) | |
| Abstract | 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). | |
| Applied methods and techniques | VDI 2762-1, VDI 2762-2 and VDI 2762-3 | |
| Additional descriptive information to understand the data | see note parameter.png in each measurement file for further measurement and reconstruction parameters | |
| Series information | Seven different pore filling grades S1-S7 (=seven pressure steps) | |
| Table of contents | CF_035_055200_014 (in-situ filtration and dewatering, seven different pore filling grades S1-S7, field of view: 4x4 mm²) | |
| Additional keywords | cake filtration, cake dewatering, X-ray tomography, in-situ, VDI 2762, capillary pressure curve, modelling | |
| Language | eng | |
| Year or period of data production | 2018 | |
| Publication year | 2021 | |
| Publisher | Technical University Bergakademie Freiberg - Institute of Mechanical Process Engineering and Mineral Processing | |
| References on related materials | IsSourceOf: 10.1016/j.seppur.2020.117215 (DOI) | |
| Content of the research data | Dataset: X-ray tomography scans of partially dewatered filter cake (.tiff stacks) | |
| Holder of usage rights | Technical University Bergakademie Freiberg - Institute of Mechanical Process Engineering and Mineral Processing | |
| Usage rights of the data | CC-BY-4.0 | |
| Software | Resource Production: Xradia XMReconstructor 10.7 | |
| Additional precise description of discipline | mechanical process engineering - solid-liquid separation - cake filtration and dewatering | |
| Discipline(s) | Engineering | de |
| Title of the dataset | X-ray tomography scan of partially dewatered filter cake |
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Publication C: Insight into filter cake structures using micro tomography: The dewatering equilibrium [1]
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.