A5075090673- Mineral Processing and Grinding
- Advanced X-ray and CT Imaging
- Minerals Flotation and Separation Techniques
- Granular flow and fluidized beds
- Hydrocarbon exploration and reservoir analysis
- Adhesion, Friction, and Surface Interactions
- Geophysical and Geoelectrical Methods
- Cyclone Separators and Fluid Dynamics
- Electrical and Bioimpedance Tomography
- Aerosol Filtration and Electrostatic Precipitation
- Medical Imaging Techniques and Applications
- Lubricants and Their Additives
- Particle Dynamics in Fluid Flows
- Underwater Vehicles and Communication Systems
- Hydraulic Fracturing and Reservoir Analysis
- Lattice Boltzmann Simulation Studies
- Microstructure and mechanical properties
- Heat and Mass Transfer in Porous Media
- Aluminum Alloys Composites Properties
- Electron and X-Ray Spectroscopy Techniques
- Digital Image Processing Techniques
- Nuclear Physics and Applications
- Hydraulic flow and structures
- Urban Stormwater Management Solutions
- Enhanced Oil Recovery Techniques
TU Bergakademie Freiberg
2018-2025
Abstract In this paper, three-dimensional (3D) image data of ore particle systems is investigated. By combining X-ray microtomography with scanning electron microscope (SEM)-based analysis, additional information about the mineralogical composition from certain planar sections can be gained. For analysis tomographic images extraction single particles essential. This performed a marker-based watershed algorithm and post-processing step utilizing neural network to reduce oversegmentation. The...
X-ray computed tomography (XCT) has seen significant development in scan time and spatial resolution over the last decades. It is now increasingly used field of particle technology including ex-situ in-situ applications to study time-lapse processes. This due its non-destructive principle giving 3D information on inner structure composition specimens. article shortly summarizes XCT focusing terms relevant for technology. also gives a brief outlook promising directions development, which may...
Mineral carbonation of subsurface basalt by CO2-rich fluids is a proven CO2 sequestration method. Aqueous and supercritical permeate through variably porous lava layers away from the injection well, somewhere along this flow pathway, mineral reactions initiate. two-stage process dissolution silicate phases carbonic acid followed precipitation carbonate minerals solution. Where pathway when, relative to start injection, begins largely unconstrained. Sub-millimetre-scale x-ray tomography...
This collection of studies, conducted within the framework DFG-funded Priority Program SPP 2045, explores role X-ray tomography in advancing multidimensional characterization particulate systems, with a strong focus on enhancing 3D particle-discrete data quality. It critically assesses limitations traditional particle methods, particularly those reliant imaging techniques, and demonstrates how advanced methodologies can overcome these constraints by providing highly detailed accurate...
In the present paper, as part of an interdisciplinary research project (Priority Programme SPP2045), we propose a possible way to design open access archive for particle-discrete tomographic datasets: PARROT database ( https://parrot.tu-freiberg.de ). This is result pilot study in field particle technology and three use cases are presented illustrative purposes. Instead providing detailed instruction manual, focus on methodologies such archive. The stem from our working group intended...
The three-dimensional characterization of distributed particle properties in the micro- and nanometer range is essential to describe understand highly specific separation processes terms selectivity yield. Both performance measures play a decisive role development improvement modern functional materials. In this study, we mixed spherical glass particles (0.4–5.8 μ m diameter) with fibers (diameter 10 m, length 18–660 m) investigate borderline case maximum difference aspect ratio significant...
Abstract Partikelgrößenverteilungen (PGVs) sind die Grundlage für Beschreibung von Partikelsystemen und deren Trennprozessen. Durch moderne, insb. bildgebende Messmethoden sowie in Kombination mit stoffspezifischer Analytik können weitere geometrische stoffliche Parameter Partikeln erfasst werden. Viele dieser Partikeleigenschaften wie Partikelgröße nicht konstant, sondern ebenfalls verteilt, so dass eine mehrdimensionale Partikeleigenschaftsverteilung vorliegt, zur Partikelprozessen genutzt...
A correlative 3D characterization workflow by micro and nano X-ray computed tomography (Micro-CT, Nano-CT) analytical scanning electron microscopy (SEM) is presented over different length scales for particle composite materials that apply to any powder at the size scale between 0.3 µm 15 µm. In this case study, an artificial compound of calcite, talcum, dolomite, magnesite providing constituent particles with similar morphology, distribution, chemical composition multidimensional separation...
Abstract Dry particle coating processes are of key importance for creating functionalized materials. By a change in surface structure, initiated during coating, property and thus functionalization can be achieved. This study introduces an innovative approach employing 3D X-ray micro-computed tomography (micro-CT) to characterize coated particles, consisting spherical alumina particles (d50 = 45.64 μm), called hosts, surrounded by polystyrene 3.5 guests. The formed structures,...
In this study, the blocking filtration laws introduced by Hermans and Bredée are applied to evaluate filter aid data. A model system is utilized for experiments, consisting of barium sulphate as impurity diatomaceous earth aid. Based on analysis data, relevant process initially identified cake separation so-called missing law sulphate. The results substantiated with X-ray microscopy monitor incorporation fine particles in structure. They demonstrate that characterised both depth migration...
In KONA 2022, the fundamentals of two- and multidimensional particle size distributions were introduced. The next question in field addresses their application to describe a process, e.g., agglomeration or separation. A separation can be seen as retrieving only particles with specific set properties from multidimensionally distributed system, small (below certain threshold size) compact spherical shape (above sphericity). allows generation functional systems properties, semiconducting,...
The removal of nonmetallic inclusions from metal melts is a crucial step in producing high‐quality castings that have to meet strict requirements regarding strength, toughness, and machinability. To separate the unwanted impurities, liquid usually passed through ceramic foam filters (CFF), which adhere surface complex strut network. development improved CFF structures requires good understanding physical phenomena involved filtration process. In this respect, an experimental investigation...
In X-ray microtomography the sample has to meet special requirements regarding (1) mechanical stability (blurring), (2) geometry (FOV - field of view, rotational symmetry) and (3) composition (high attenuating phases). When analyzing micron-sized particulate material (e.g. powders), particles in FOV have be (4) statistically representative fixation (embedding matrix) becomes a critical issue due segregation agglomeration effects. The authors describe self-constructed, low-cost automated...
This study presents a new approach in the quantification of deposited amount impurity inside filter cake made up aid material. For this purpose, three-dimensional imaging by X-ray tomography is applied. Based on attenuation properties, model system consisting kieselguhr as and barium sulphate chosen. Due to particle size being smaller than spatial resolution measuring setup, calibration necessary gain insight into subvoxel information. A so-called phantom similar material composition...
Particle size and shape characteristics are commonly measured with two-dimensional (2D) imaging techniques, two of which static or dynamic techniques. These 2D particle need to be applied particulate processes where they model three-dimensional (3D) processes. The correlation between 3D is therefore necessary, but the knowledge still limited either mathematically simple shapes specific sets investigated bulk solids. A dataset consisting six solids X-ray microscopy was used simulate results...
In this paper, 3D image data of ore particle systems is investigated. By combining X-ray micro tomography (XMT) with scanning electron microscope (SEM) based analysis additional information about the mineralogical composition from certain planar sections can be gained. For tomographic images extraction single particles essential. This performed a marker-based watershed algorithm and post-processing step utilizing neural network to reduce oversegmentation. The results are validated by...
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