TU Bergakademie Freiberg Data Publications

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Data publications from research of Freiberg University of Mining and Technology.

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  • ItemOpen Access
    Research data for "Multiscale Characterisation of Lithium Aluminate in Laboratory- and Pilot-Scale EnAM Slags"
    (Technische Universität Bergakademie Freiberg, 2026-10-09) Rachmawati, Cindytami; Mongoljiibuu, Shine-Od; Weiss, Joao; Hamers, Maartje; Möckel, Robert; Friedrich, Bernd; Peuker, Urs A.
    This dataset supports the study “Applying Engineered Artificial Mineral (EnAM) Concept from Lab to Pilot Scale: Lithium Aluminate in Lithium-Bearing Slag Systems”. It contains experimental and processed data of a 125 kg pilot-scale slag (Slag P). The data comprise, X-ray diffraction phase analysis, micro-X-ray fluorescence (µXRF) elemental maps, X-ray computed tomography (XCT) volumes, and electron backscatter diffraction (EBSD) measurements. Derived data include segmented EnAM-rich clusters, cluster size and circularity, centroid-based nearest-neighbour distances, three-dimensional anisotropy, and individual lithium aluminate grain properties. The dataset enables investigation of scale-dependent changes in lithium-bearing phase formation, spatial distribution, clustering and intergrowth. µXRF and XCT data describe EnAM-rich clusters, whereas EBSD data resolve individual crystallographic grains. Documentation identifies sample positions, measurement conditions, processing procedures and the provenance of laboratory-scale comparison data.
  • ItemOpen Access
    Supplementary Material for the Dissertation "Characterization of Coated Particles from Mechano-Fusion"
    (Technische Universität Bergakademie Freiberg, 2026-10-06) Seyffer, Judith Miriam
    The dry particle coating process of mechano-fusion (MF) is of interest for a variety of applications, ranging from pharmaceuticals to battery materials. In this work, MF was used to produce hetero-aggregate type coated particles. Dense, discrete and homogeneous monolayer coatings were formed for the particle system consisting of spherical alumina host particles and spherical polystyrene guest particles over a wide parameter space of the available MF device. Increasing the processing intensity, mainly by increasing the rotational speed, led to guest particle deformation and even comminution. The hetero-aggregate microstructure was investigated from different perspectives. Correlating a hetero-aggregate microstructural property (specific surface area) with the macroscopic property of flowability revealed distinct structure–property groups, detailing the influence of MF process parameters. Dry laser diffraction provided information beyond the apparent hetero-aggregate particle size, e.g., on the guest particle aggregation and deformation state. Insight into the 3D structure and morphology of the coating, as well as the guest particle connectivity, was gained through micro-computed tomography (micro-CT), by computing, e.g., coating thickness and guest particle distances. Atomic force microscopy allowed for the guest particle-discrete quantification of deformation. The analyses via micro-CT were extended to a model battery particle system, which exhibited continuous coatings. Since the observed hetero-aggregate structures are not specific to MF, the characterization workflows are transferable to other particle systems and dry coating processes.
  • ItemOpen Access
    GRK 2802: Anodes based on MgO-C Recyclates and 316L Steel for Prospective Aluminium Fused-Salt Electrolysis Application
    (Technische Universität Bergakademie Freiberg, 2026-09-25) Gehre, Patrick; Yaroshevskyi, Serhii; Kaiser, Patricia; Brachhold, Nora; Hubálková, Jana; Aneziris, Christos
    Every year, approx. 28 million tons of used refractories accumulate worldwide. The majority of them are used as aggregates for road construction (downcycling) or are deposited in landfills. For ecological and economic reasons, an increased research potential was identified in recent years, dedicated to increasing the recycling rate and finding new markets and application fields with a higher value of the refractory recyclates. The study presents the current findings of the development of inert electrodes for the aluminum fused-salt electrolysis composed of steel and MgO gained from MgO-C recyclates. To withstand the chemical attack of molten aluminum and cryolitic melts, the metal-ceramic composites were preoxidized (PO) at 800 °C, 900 °C, and 1000 °C. The microstructure after each PO thermal treatment was analyzed. After PO at 800 °C, a (Cr,Fe)3O4 spinel-like phase and Fe-O Mg-O solid solution form. After PO at 900 °C, a larger amount of the Fe-O Mg-O solid solution and a (Cr,Fe)2O3 solid solution around the steel grains was identified. Furthermore, the electrical conductivity of the metal-ceramic-composites preoxidized at 900 °C amounts to 1.49·102 S·cm-1 and hence is in the range of carbon, which exhibits a value of 1.54·102 S·cm-1. Additionally, the impact of different preoxidation treatments at 900 °C by applying furnaces equipped with electrical heating, natural gas burner, and microwave plasma burner on the microstructure was investigated.
  • ItemOpen Access
    GRK 2802: MgO-C Ladle Bricks based on Recyclates and Lignin-Collagen-Fructose Binder System
    (Technische Universität Bergakademie Freiberg, 2026-09-25) Gehre, Patrick; Gunasekar, Dinesh Kumar; Hubálková, Jana; Aneziris, Christos
    Every year, approx. 28 million tons of used refractories accrue worldwide. After their break out, the majority of them are used in subordinate application fields such as aggregates for road construction (downcycling) or deposited in landfills. Their recycling in the field of refractory materials played an underpart so far. For ecological and economic reasons, an increased research potential was identified in the last years consecrated to increasing the recycling rate of refractories and finding new markets and application fields with higher value for them. The study presents current findings of a long-term research training group addressing (amongst others) the development of MgO-C ladle bricks containing MgO-C recyclates and being bonded with pitch- and resin-free environmentally friendly binders. So far, the favored batches contained an oxidic grain fraction composed of 40.5 wt.-% fused MgO raw material, 40.5 wt.-% MgO-C recyclates, 14 wt.-% sintered magnesia (DBM) raw material together with 5 wt.-% graphite and optional antioxidants (TiO2, Al, SiO2). A binder system composed of a mixture of lignin, collagen, and polyethylene glycol (PEG) was developed. The latter served as a pressing aid and was necessary due to the absence of liquid resin in the batch. Even after a considerable and auspicious optimization during previous studies, this basic batch containing recyclates and no pitch or resin does not meet the physical and mechanical properties of standard industrial bricks. Hence, in the present study, the binder system was enhanced by using varying amounts of lignin, collagen, and tannin together with polyethylene glycol, fructose, and citric acid addition. The new developed MgO-C mixtures were pressed uniaxially, dried, cured, and carbonized at 1000 °C. It has been found that polyethylene glycol, which impairs the material properties, can be omitted using sufficient amounts of fructose. The addition of citric acid leads to a further increase in CCS. Consequently, actual optimized environmentally friendly MgO-C batches show a CCS of 85 % of the value of industrial pitch- and resin-bonded bricks without recyclates.
  • ItemOpen Access
    The Influence of Biomass Cokes on the Microstructure and Thermal Shock Resistance of MgO-C Refractories
    (Technische Universität Bergakademie Freiberg, 2026-09-21) Gehre, Patrick; Kapessov, Magzhan; Guhl, Stefan; Gräbner, Martin; Aneziris, Christos G.
    In this study, biomass cokes from sunflower seed hull (SFSH) and wood pellets (WP) were added to a MgO-C batch (3 mass % C) to replace 1.1 mass % of graphite. After hardening and carbonizing the samples, the influence of the biomass cokes on the microstructure and thermal shock resistance was investigated. The replacement of flaky graphite by carbonized WP and SFSH reduced the bulk density and increased the apparent porosity after pressing and carbonization, but the degree was only marginal. This was confirmed by SEM investigations, where the biomass-coke containing samples exhibited a microstructure with a higher amount of pores between the fine MgO grains. The thermal shock resistance of the porous wood pellet coke containing MgO-C is at the same level as the reference sample but not superior to it.
  • ItemOpen Access
    Research data on vapor-liquid equilibria of organic carbonates (DMC, EMC, DEC, EC, and PC) at 101.3, 25.0, and 5.0 kPa, as well as vapor pressure data
    (Technische Universität Bergakademie Freiberg, 2026-08-25) Goldberg, Tom
    The reported data correspond to the following publication: Tom Goldberg, Volker Herdegen, Andreas S. Braeuer “Isobaric vapor-liquid equilibria of binary and multicomponent organic carbonate mixtures (DMC, EMC, DEC, EC, and PC) at 101.3, 25.0, and 5.0 kPa” Journal of Chemical & Engineering Data, 2026 All measurements were carried out using the all-glass dynamic recirculation still “Labodest VLE 602” (i-Fischer Engineering GmbH, Germany). Detailed information about the materials, experimental setup, experimental procedure, and standard uncertainties can be found in the associated publication. The file “Vapor_pressure_data.txt” contains vapor pressure data for each of the five pure organic carbonates: dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), ethylene carbonate (EC), and propylene carbonate (PC). The file “Binary_VLE_data.txt” contains binary vapor-liquid equilibrium (VLE) data for all 10 binary combinations of the five organic carbonates. The measurements were performed at 101.3 kPa and 25.0 kPa, with the exception of the PC–EC system. For PC–EC, measurements were performed at 25.0 kPa and 5.0 kPa due to observed thermal degradation at temperatures above approximately 483–493 K. The file “Multicomponent_VLE_data.txt” contains ternary VLE data for the systems DMC–EMC–DEC, DMC–DEC–PC, and EMC–PC–EC, as well as quinary VLE data.
  • ItemOpen Access
    Dataset for publication ``A bin-resolved statistical framework for comparing particle size distributions''
    (Technische Universität Bergakademie Freiberg, 2026-07-23) Mitra, Rahul
    This dataset accompanies the study introducing the Difference Significance Profile (DSP), a statistically rigorous framework for bin-resolved comparison of particle size distributions (PSDs). It contains particle-level size measurements obtained by in-line SOPAT imaging of spray-dried alumina powders, together with all processed data required to reproduce the statistical analyses presented in the associated publication. The repository includes raw particle-size data, common binned PSDs, probability differences, bin-wise DSP statistics, bootstrap calibration results, covariance matrices, and comparison-level summary statistics for two experimental scenarios: (i) powders produced under different spray-drying temperatures (120 °C and 145 °C) and (ii) repeated experiments under identical conditions (120 °C) to assess repeatability. Additionally, mercury intrusion porosimetry measurements for the two temperature conditions are provided to support the physical interpretation of the observed PSD differences. The dataset enables complete reproduction of the DSP analysis, facilitates benchmarking against alternative PSD comparison methods, and provides a reusable resource for statistical analysis of particle size distributions in particle technology and related fields.
  • ItemOpen Access
    Data and simulations for green hydrogen development in Cameroon
    (Technische Universität Bergakademie Freiberg, 2026-07-14) Brumme, Anja; Golub, Alexander; Markandya, Anil; Rübbelke, Dirk
    We examine the conditions and consequences of establishing green hydrogen facilities in Cameroon. Using publicly available data, we develop a normative numerical model to identify potential trajectories for macroeconomic and environmental indicators. This dataset contains raw and processed data as well as simulation results and sensitivity analyses of key parameters.
  • ItemOpen Access
    Corrosion and Process Analysis of a Preoxidized MgO Recyclate-based Cermet Anode in Laboratory-Scale Na-Cryolite Molten Salt Electrolysis of Aluminum at 1000 °C
    (Technische Universität Bergakademie Freiberg, 2026-07-14) Adamczyk, Alexander; Hossain, Farhan; Garcia Paz, Felipe A.; Yaroshevskyi, Serhii; Vogt, Daniel; Aneziris, Christos G.; Charitos, Alexandros
    The development of inert anodes for aluminum electrolysis remains challenging due to the high corrosivity of cryolite-based melts at 950°C–1000°C. This study investigates the corrosion and process behavior of a carbon-free MgO–steel cermet anode derived from refractory recycling during laboratory-scale Na-cryolite electrolysis at 1000°C, focusing on the effect of a pre-oxidation treatment on its corrosion behavior. In the as-sintered state, MgO grains are mechanically bonded to a 316L steel matrix with interfacial porosity that limits corrosion resistance. Pre-oxidation at 900°C for 24 h forms a dense Mg–M–O (M=Fe, Cr) oxide-rich surface layer, sealing pores and improving resistance to cryolite infiltration, albeit at the cost of reduced electrical conductivity, which translated into an overall higher cell voltage compared to the as-sintered state. During electrolysis, this layer degrades under anodic polarization, O2 evolution, and fluorination. The surface transforms into a Fe–O-rich magnetite layer (Fe3O4), while a Cr-containing oxide and an in situ Mg–Fe–O transition zone form beneath, maintaining partial protection. Overall, pre-oxidation effectively delays electrolyte penetration by converting MgO into new oxide phases but introduces conductivity losses and surface instability. The results highlight both the potential and limitations of MgO-based cermet anodes for sustainable aluminum production.
  • ItemOpen Access
    Research data for: "Analyzing the 3D morphology of particle systems coated by mechano-fusion using micro-CT image data"
    (Technische Universität Bergakademie Freiberg, 2026-06-17) Seyffer, Judith Miriam; Gräfensteiner, Phillip; Rieder, Philipp
    This dataset contains micro-computed tomography (micro-CT) and high-resolution scanning electron microscopy (SEM) image data of alumina host particles coated with polytetrafluoroethylene (PTFE) guest particles via mechano-fusion, a dry particle coating process. The data supports quantitative analysis of 3D coating morphology using geometric descriptors including coating thickness, surface area coverage, and contact loss. Micro-CT scans of the in epoxy resin embedded particles were acquired with a Zeiss Xradia 510 Versa across two fields of view (upper and lower part) of a 1 mm × 1 mm × 2 mm sample. The dataset includes raw reconstructed image stacks alongside phase-wise, aggregate-wise, and host-only segmentation outputs generated via a hierarchical segmentation pipeline developed as part of the research. SEM images of five polished cross-sections of the same sample were acquired with a Tescan Amber using a backscattered electron detector. An ilastik pixel classification model for SEM image segmentation is also provided. This dataset is associated with the publication "Analyzing the 3D morphology of particle systems coated by mechano-fusion using micro-CT image data."
  • ItemOpen Access
    Additional data: From Biotechnological Residues to Biodegradable Printed Circuit Boards: Aspergillus niger Mycelium as a Structural Support Material
    (Technische Universität Bergakademie Freiberg, 2026-06-16) Stegbauer, Linus; Oehlsen, Nina; Wachsmann, Sebastian; Fauser, Dominik; Glauche, Florian; Laschat, Sabine; Selbmann, Franz; Steeb, Holger; Arki, Pal; Glöser-Chaoud, Simon
    The electronics industry urgently seeks sustainable, biodegradable alternatives to conventional substrates for printed circuit boards (PCBs) to reduce the environmental impact of electronic waste and CO2 emissions. Here, we introduce a biobased, plastic-like material derived from Aspergillus niger mycelium, AnimatRT. This material is produced from residual biomass generated in industrial citric acid production, offering a circular-economy approach. The raw mycelial biomass, consisting of spherical pellets, is processed via mold casting and air-drying, consolidating the pellets into a dense, plastic-like monolith (1.23 g cm⁻³). When formed into sheets, AnimatRT serves as a viable substrate for low-complexity PCB fabrication, allowing for direct ink writing and manual soldering of electronic components. Although its electrical properties are lower than those of FR-2 (flame retardant 2), a common, low-cost PCB laminate made of paper bonded with a phenolic resin, it remains suitable for low-frequency and proof-of-concept applications and, on average, has 56% lower embodied carbon. The mycelium boards disintegrate in water, allowing recovery of operative electronic components, whose functionality was demonstrated by re-soldering them onto a conventional PCB. The material exhibits high mechanical performance, with compressive strengths of up to 121 MPa, a flexural modulus of 2.3 GPa, and a flexural strength of 30 MPa. It is fully biodegradable (ISO 20200), redispersible in water, has low flammability, and favorable thermal insulation properties (0.21 W (mK)‑1). Heat treatment at 120°C enhances the mechanical properties, improves water resistance, and slows biodegradation. This study demonstrates the first use of biotechnology–derived A. niger mycelium as a biodegradable substrate for PCBs, addressing circularity and end-of-life challenges in electronics.
  • ItemOpen Access
    Research data for: "Particle size analysis and beyond - laser diffraction and derived information regarding structures of mechano-fusion coated particles"
    (Technische Universität Bergakademie Freiberg, 2026-06-02) Seyffer, Judith Miriam
    Laser diffraction (LD) is widely used for the analysis of particle size distribution (PSD). Due to the structure of dry-coated mechano-fusion particle systems, the interpretation of the PSD remains challenging. This study investigates hetero-aggregate coating structures of alumina host particles (median diameter 43.3 μm) with polystyrene guest particles (mean diameter 3.5 μm) in dry LD measurements and how dispersion conditions influence the PSD. Gentle freefall dispersion preserves coating structures and yields a monomodal PSD consistent with expected coated particle size. Differences in the PSD between samples of coated particles prepared under different process conditions are only observed using highintensity dry dispersion. High-intensity dispersion alters the aggregation state by detaching guest particles, leading to bimodal PSD. The plateau values in the cumulative distribution furthermore exceed theoretical guest volume fractions. Experimental measurements are combined with simulations of diffraction patterns and inverse reconstruction. Simulations qualitatively support the experimental findings by linking particle arrangement and deformation to reconstructed PSD features. The apparent overrepresentation is attributed to guest particle deformation and comminution, biasing the volume-weighted PSD. Hence, LD provides more than particle size information: aggregation state, dispersion-induced changes, and guest particle deformation are revealed, enhancing the applicability of LD for quality control of dry-coated hetero-aggregates.
  • ItemOpen Access
    Supplemental SEM-EDS (MLA) and CT data for the publication "CNN-based 3D characterization and liberation analysis of lithium-bearing slag particles using correlative CT and SEM imaging"
    (Technische Universität Bergakademie Freiberg, 2026-05-13) Ditscherlein, Ralf
    This dataset provides the underlying X-ray CT data and processed image stacks used for particle-scale characterization and evaluation of the proposed workflow. The study addresses the challenge of accurately characterizing lithium-bearing slag particles to improve recovery of critical raw materials. A correlative workflow combining 3D CT imaging with 2D SEM-based mineral maps is used to train convolutional neural networks for phase-wise and particle-wise segmentation. This enables scalable 3D characterization with minimal manual labeling effort. The models are applied to particle size fractions of 63–100 µm and 100–250 µm. Results show that conventional 2D approaches systematically overestimate mineral liberation, while the presented 3D approach reduces stereological bias and provides more reliable input for process optimization.
  • ItemOpen Access
    Filtration and Particle Discrete Data (quartz < 200 µm) for 'Project Development of multivariant structure and process models for filter cakes, combining experimental methods of process engineering with digital computer based methods'
    (Technische Universität Bergakademie Freiberg, 2026-04-29) Löwer, Erik
    This dataset contains primary experimental data investigating the filtration behavior and particulate properties of quartz particles. The data was generated through separation tests conducted in accordance with the VDI 2762 guideline (cake-forming filtration). The study aims to correlate particle morphology with specific filter cake resistance within a viscous medium. Quartz (SiO2, 2.7 g/cm³) from Strobel Quarzsand GmbH, product name BCS201, was used as the disperse phase. To ensure a defined particle size distribution, the material was pre-classified to a target range of 50 to 200 µm using a Nisshin Turbo Classifier TC-15M fine air classifier. The continuous medium consisted of a binary water-glycerin mixture: Glycerin content: 24 mass percent (wt%) Additive: 25 mM potassium iodide (KI). Both chemicals were sourced in analytical grade from Carl Roth GmbH + Co. KG. Complementary 3D-characterization data, including CT scans (Computed Tomography) and segmented individual particle data, are archived in the "Parrot" database of the TU Bergakademie Freiberg (https://parrot.tu-freiberg.de/).
  • ItemOpen Access
    Filtration and Particle Discrete Data (glass beads < 160 µm) for 'Project Development of multivariant structure and process models for filter cakes, combining experimental methods of process engineering with digital computer based methods'
    (Technische Universität Bergakademie Freiberg, 2026-04-29) Löwer, Erik
    This dataset contains primary experimental data investigating the filtration behavior and particulate properties of glass particles, spherical, < 160 µm. The data was generated through separation tests conducted in accordance with the VDI 2762 guideline (cake-forming filtration). The study aims to correlate particle morphology with specific filter cake resistance within a viscous medium. Soda-lime glass (SiO2, 2.55 g/cm³) from Sigmund Lindner GmbH, was used as the disperse phase. To ensure a defined particle size distribution, the material was pre-classified to a target range of 70 to 160 µm using a Nisshin Turbo Classifier TC-15M fine air classifier. The continuous medium consisted of a binary water-glycerin mixture: Glycerin content: 24 mass percent (wt%) Additive: 25 mM potassium iodide (KI). Both chemicals were sourced in analytical grade from Carl Roth GmbH + Co. KG. Complementary 3D-characterization data, including CT scans (Computed Tomography) and segmented individual particle data, are archived in the "Parrot" database of the TU Bergakademie Freiberg (https://parrot.tu-freiberg.de/).
  • ItemOpen Access
    Sensitivity of Filter Cake Permeability to Systematic Variations in Particle Shape and Size: A Bottom-Up Stochastic Analysis
    (Technische Universität Bergakademie Freiberg, 2026-04-28) Löwer, Erik
    The data belongs to the corresponding publication "Sensitivity of Filter Cake Permeability to Systematic Variations in Particle Shape and Size: A Bottom-Up Stochastic Analysis" with the following abstract. A key question in filtration process design is understanding the filtration properties of a specific particle system. Current methods, like the Carman-Kozeny equation, struggle to accurately predict specific cake resistance and capillary pressure from a given particle size distribution, leading to reliance on limited empirical correlations. This poses challenges for process simulation, as the transition from particle characteristics to filter cake properties remains unclear. This work aims to correlate the distribution of multi-dimensional particle properties—both size and shape—with the properties of the resulting 3D filter cake morphology. We use tomographic image data of real filter cakes to validate a stochastic 3D model which describes the relationship between particle properties and multiphase filter cake characteristics using generated virtual particles that statistically resemble the actual data. Validation is provided by filter cakes from two different particle systems: spherical glass and broken quartz particles ranging in size from 40 to 300 μm with sphericity values from 0.5 to 1. Artificial, but realistic particles following the same particle property distributions are utilized to construct virtual filter cake structures using a forced bias algorithm, which statistically represent actual cake structures. The generated virtual cake structures allow for deriving trends in permeability by systematically varying particle properties virtually. The dataset provides the used raw data and the generated artifical cake structures which were used for the correlation of several particle, structure and process parameters of the investigated filtration process.
  • ItemOpen Access
    Research Data - Determination of total hemispherical emissivity utilizing an in-situ calibrated, coupled experimental-simulative electron beam calorimetric approach
    (Technische Universität Bergakademie Freiberg, 2026-03-10) Kerber, Konrad
    The accurate determination of the total hemispherical emission coefficient (THEC) of materials is essential for modeling radiative heat transfer in high-temperature vacuum environments. This study presents a rapid steady-state calorimetric method to determine the THEC using a vacuum electron beam (EB) facility. A graphite-coated Inconel 718 foil with a thickness comparable to the electron penetration depth was used as the emission target, allowing temperature equalization within seconds. Surface temperatures were recorded via a calibrated two-colour thermal imaging system. An in-situ calibration was conducted, using the melting point of pure copper as a fixed reference. Numerical simulations were employed to validate both the emissivity determination and the temperature calibration methodology. EB heating efficiency was determined at 150 keV in a combined experimental-simulative approach using Monte Carlo simulations and backscattered electron intensity capture. Temperature calibration showed high reproducibility with a median absolute deviation of +- 0.4% and a half range of +- 1.1% at 1085 °C, and was shown to be transferable to other materials. EB heating efficiency slightly decreased from 0.832 +- 0.003 at room temperature to 0.825 +- 0.002 between 800 °C to 1140 °C. THEC values between 0.88 and 0.92 with a maximum half range of +-0.06 were obtained in the range of 840 °C to 1110 °C for graphite-coated Inconel 718 with a median roughness of Ra = 1.2 µm. Reflected radiation from the emission target and thermal losses from conduction and sublimation were assessed and found negligible. Results were consistent with literature, particularly under high surface roughness or pre-oxidized conditions.
  • ItemOpen Access
    X-ray CT Data of Lunar Regolith Simulants and Gray Value Sensitive Simulation Data
    (Technische Universität Bergakademie Freiberg, 2026-02-18) Ditscherlein, Ralf
    This dataset provides reconstructed X-ray microtomography data of four lunar regolith simulants together with simulated data for method evaluation. The dataset enables reproducibility of the particle fingerprint visualization technique, supports exploration of imaging artifacts, and provides reference implementations in Python. It is intended for use in particle system characterization, image analysis, and method benchmarking.
  • ItemOpen Access
    Magnetic suscptibility classes of WEEE slag and Norra Kärr Ore
    (Technische Universität Bergakademie Freiberg, 2026-02-17) Siddique, Asim; Leißner, Thomas
    This dataset contains particle-scale mineralogical and magnetic characterization data of particulate materials relevant to magnetic separation in mineral processing. It was developed to enable quantitative assessment of magnetic susceptibility variability at both class and particle scales and to support geometallurgical analysis of separation behavior. The dataset integrates experimental magnetic classification, bulk magnetic susceptibility measurements, and SEM-based automated mineralogical analysis. The data were generated from two contrasting material systems: a natural ore (Norra Kärr) and a secondary resource derived from Waste of Electrical and Electronic Equipment (WEEE) slag. For the natural ore, two particle size fractions were investigated (500–1000 µm and 125–250 µm), while for the WEEE slag a finer particle size fraction (63–100 µm) was analyzed. This combination of materials and size fractions allows evaluation of magnetic heterogeneity across different mineralogical complexities and processing-relevant conditions. Components of the Dataset Magnetic Susceptibility Classification Data: • Particles were separated into discrete magnetic susceptibility classes using a Frantz Isodynamic Separator by systematically varying the applied magnetic field strength under controlled chute conditions. • Each susceptibility class represents a population of particles with comparable magnetic response. Bulk Magnetic Susceptibility Measurements: • For each magnetic susceptibility class, bulk magnetic susceptibility was measured using a magnetic susceptibility balance. • Multiple sub-samples and repeated measurements were performed per class to improve representativity and reduce measurement uncertainty. • The resulting values provide class-average magnetic susceptibility used as reference data. SEM-Based Automated Mineralogy (MLA) Data: • Quantitative mineralogical characterization of each magnetic susceptibility class was performed using Mineral Liberation Analysis (MLA). • The data include modal mineral phase proportions for each susceptibility class. • Particle-by-particle mineralogical compositions were extracted, providing phase fractions and mineral associations at the individual particle scale. Metadata and Experimental Context: • The dataset includes metadata describing particle size fractions, magnetic separation conditions, measurement procedures, and material context. • This information enables reproducibility and supports reuse of the data in comparative or methodological studies. The dataset enables analysis of relationships between mineralogical composition and magnetic response, estimation of particle-scale magnetic susceptibility, and assessment of magnetic heterogeneity in mineral feeds. It is suitable for applications in magnetic separation studies, geometallurgical analysis, particle-based mineral processing research, and the development or validation of data-driven characterization methods. Users should note that MLA-derived mineralogical data are based on two-dimensional polished sections and may be subject to stereological effects.
  • ItemOpen Access
    Simultaneous Measurement of Flow in Open Flow Channel with Pulsed-Wave-Doppler-Velocimetry and Particle-Image-Velocimetry
    (Technische Universität Bergakademie Freiberg, 2026-01-13) Schierling, Lennart; Kunz, Robert
    Simultaneous measurement of flow velocity in an open flow channel via ultrasound (Pulsed-Wave-Doppler principle) and optical methods (Particle-Image-Velocimetry). The dataset contains the unprocessed ultrasound signals as well as the images taken by a high speed camera for a set of flow states