Contact
Anna Magdalena Baecke
PhD student in the project FINEST
Fluid Dynamics Resource Technology Processes
a.baecke
hzdr.de
Phone: +49 351 260 2192
Dr. Gregory Lecrivain
Head Particle dynamics
Fluid Dynamics Resource Technology Processes
g.lecrivainhzdr.de
Phone: +49 351 260 3768
Investigation of powder mixing for fine particle recycling
Investigation of powder mixing for fine particle recycling
Motivations
Industrial processes are inevitably associated with generating fine-grained particulate matter. Such fine-grained residues rarely find re-entry into industrial value chains; typically, they are disposed and become an environmental burden. Prominent examples are dusts from mineral processing, degraded end-of-life fibers, or micro plastic entering the natural environment. The project FINEST processes different residues in an optimized manner to generate value and to minimize hazards. The approach includes a mixing and agglomeration step. We study the mixing of fine particles in this context.
Experimental visualization of an opaque powder system
In powder mixing, segregation is caused by differences in particle properties. In the context of FINEST, it is by their different density, because the particles range from plastics to metals. We choose a noninvasive technique to investigate the process. Microfocus X-Ray computed tomography (µCT) provides insight into the composition of the powder mixture at any point in space and allows to analyse the powder flow. Using a 3D analysis method, it describes the evolution of mixing quality over time. We apply the method to a variety of mixtures and can give a full image of parameters that lead to segregation and the dependency of the mixing quality on those. Complementary to the experimental study, continuum modelling is chosen here to simulate the mixing with a Finite Volume Model.
Figure 1: Experimental Results - µCT scan of powder mixture, 3D view, vertical and horizontal slice
Funding
This work is part of the project ‘Use and management of finest particulate anthropogenic material flows in a sustainable circular economy’ (FINEST) funded by the Initiative and Networking Fund of the Helmholtz Association under grant agreement number KA2-HSC-10.
Publications
Baecke, A. M.; Boden, S.; Bieberle, M.; Renno, A. D.; Hampel, U.; Lecrivain, G.; Tomography to assess powder mixing in cylindrical bladed mixer; Submitted
Baecke, A. M.; Renno, A. D.; Hampel, U.; Lecrivain, G.; Mixing and Agglomeration of Shredder Fines and Flue Dust, PARTEC, 26.-28.09.2023, Nürnberg, Deutschland
Baecke, A. M.; Boden, S.; Bieberle, M.; Renno, A. D.; Hampel, U.; Lecrivain, G.; Powder mixing for fine particle recycling - an X-Ray tomography study, 16th International Conference on Gas–Liquid and Gas–Liquid–Solid Reactor Engineering, 02.-05.09.2024, Dresden, Deutschland
Baecke, A. M.; Boden, S.; Bieberle, M.; Renno, A. D.; Hampel, U.; Lecrivain, G.; Powder mixing for fine particle recycling - X Ray & numerical study, DECHEMA Forum 2024, 11.-13.09.2024, Friedrichshafen, Deutschland
