X-ray tomography scans of filter cakes (feed slurry: variation in solid volume fraction)
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 | German Research Foundation | |
Contributing person | Peuker, Urs Alexander | |
Contributing person | Leißner, Thomas | |
datacite.description.SeriesInformation | Variation in solid volume fraction and comparison of in-situ built filter cakes ('CF') and in a conventional pressure nutsch ('VDI'), both scanned by X-ray tomography (Zeiss X-radia Versa 510). The initial slurry contains Al2O3 particles suspended in a potassium iodide-glycerol solution. These were separated by cake-forming filtration. | |
datacite.description.TableOfContents | CF_010_055200_021 (feed slurry: 10 vol.-% solid volume fraction, in-situ cake filtration), CF_015_055200_020 (feed slurry: 15 vol.-% solid volume fraction, in-situ cake filtration), CF_020_055200_016 (feed slurry: 20 vol.-% solid volume fraction, in-situ cake filtration), CF_025_055200_019 (feed slurry: 25 vol.-% solid volume fraction, in-situ cake filtration), CF_030_055200_017 (feed slurry: 30 vol.-% solid volume fraction, in-situ cake filtration), CF_035_055200_015 (feed slurry: 35 vol.-% solid volume fraction, in-situ cake filtration), CF_040_055200_018 (feed slurry: 40 vol.-% solid volume fraction, in-situ cake filtration), VDI_025_055200_003a (feed slurry: 25 vol.-% solid volume fraction, sampled cake, built according VDI 2762, above filte cloth, centre of cake), VDI_025_055200_003b (feed slurry: 25 vol.-% solid volume fraction, sampled cake, built according VDI 2762, beneath surface, centre of cake), VDI_025_055200_007a (feed slurry: 25 vol.-% solid volume fraction, sampled cake, built according VDI 2762, above filte cloth, next nutsch wall), VDI_025_055200_007b (feed slurry: 25 vol.-% solid volume fraction, sampled cake, built according VDI 2762, beneath surface, next nutsch wall), VDI_025_055200_008 (feed slurry: 25 vol.-% solid volume fraction, sampled cake, built according VDI 2762, total cake height, centre of cake), VDI_025_055200_009 (feed slurry: 25 vol.-% solid volume fraction, sampled cake, built according VDI 2762, total cake height, next nutsch wall) | |
Documentation of the data | Resource Type: X-ray tomography scans of filter cakes (.tiff stacks) Methods: cake filtration according VDI 2762-1, VDI 2762-2, VDI 2762-3 Data Acquisition: cake filtration (in-situ experiment, 5 mm flow cell), cake filtration (sampled filter cakes, 50 mm diameter of pressure nutsch) Data Processing: automatic centre shift, beam hardening correction (0.05), gauss smoothing filter (kernel 0.7) see notes in parameter.png for each measurement (measurement and reconstruction parameters) | |
References to related material | 10.1016/j.powtec.2019.12.054 | |
Description of the data | Publication A: Study on the influence of solids volume fraction on filter cake structures using micro tomography(Paper_A) Prediction of micro processes, filter cake build-up and porous media flow is a key challenge to describe macroscopic parameters like filter cake resistance. This is based on a precise description, not only of the disperse solid fraction, but the distributed properties of the voids between the particles. Lab-experiments are carried outwith alumina and limestone,which differ in particle size distribution (PSD) and resulting filter cake structure. Filter cakes of bothmaterials are characterized by standardized lab tests and additionally, alumina cakes aremeasured with X-ray microscopy (XRM). Focusing on distributed process key parameters, the data gives a deeper understanding of the laboratory experiments. The solid volume fraction inside the feed strongly influences the particle sedimentation and leads typically to a top layer formation of fine particles in the final filter cake,which has a negative influence on subsequent process steps. The top layers seal the filter cake for washing liquid and increase the capillary entry pressure for gas differential pressure de-watering. The influence on cake structure can be seen in a change of porosity, particle size and shape distribution over the height of the filter cake. In all measurements, homogenous filter cake structures could only be achieved by increasing the solid volume fraction inside the suspension above a certain percentage, at which particle size related sedimentation effects could be neglected and only zone sedimentation occurred. XRM offers the chance to quantify these effects, which previously could only be described qualitatively. | |
Type of the data | Dataset | |
Total size of the dataset | 45141527009 | |
Author | Löwer, Erik | |
Upload date | 2021-08-20T07:37:31Z | |
Upload date | 2026-06-04T14:26:29Z | |
Publication date | 2021-08-20T07:37:31Z | |
Publication date | 2026-06-04T14:26:29Z | |
Data of data creation | 2017-2018 | |
Publication date | 2021-08-20 | |
Abstract of the dataset | X-ray tomography measurements (Zeiss X-radia Versa 510) of in-situ and in a VDI pressure nutsch built filter cakes (Al2O3 crushed particles in 25 mmol/l KI brine with 24 m.-% glycerol). The filter cakes are measured completely saturated. The initial slurry contains Al2O3 particles by variation of the solid content from 10 to 40 vol.-%. | |
dc.identifier | CF_025_055200_019 | |
dc.identifier | CF_010_055200_021 | |
dc.identifier | VDI_025_055200_007 | |
dc.identifier | VDI_025_055200_009 | |
dc.identifier | CF_040_055200_018 | |
dc.identifier | CF_035_055200_015 | |
dc.identifier | CF_015_055200_020 | |
dc.identifier | CF_020_055200_016 | |
dc.identifier | VDI_025_055200_008 | |
dc.identifier | CF_030_055200_017 | |
dc.identifier | VDI_025_055200_003 | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/2512 | |
Public reference to this page | https://doi.org/10.25532/OPARA-121 | |
dc.language | eng | |
Publisher | Technische Universität Bergakademie Freiberg | |
Licence | Attribution 4.0 International | |
URI of the licence text | http://creativecommons.org/licenses/by/4.0/ | |
Specification of the discipline(s) | 4 | |
Title of the dataset | X-ray tomography scans of filter cakes (feed slurry: variation in solid volume fraction) | |
dc.title.alternative | feed slurry: 10 to 40 vol.-% solid volume fraction, in-situ and in a VDI pressure nutsch built filter cakes | |
Research instruments | X-ray microscope (ZEISS X-radia Versa 510) | |
Underlying research object | glycerol (manufacturer Carl Roth, > 99,8 %, 24 m.-%) | |
Underlying research object | water (demineralized) | |
Underlying research object | potassium iodide (manufacturer Carl Roth, > 99 %, 25 mmol/l) | |
Underlying research object | gamma-Al2O3 (manufacturer Almatis, solid powder, 55 µm < x < 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) |
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