Central project - Slag synthesis, design and characterization

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The project works on a combination of metallurgical slag generation and mechanical slag formulation as well as corresponding characterization. The service character of the project towards the PP derives from the supply of defined formulated and characterized slag samples for further projects, since it is necessary to provide sufficient quantities of EnAM containing slags already in the early stage of the first funding period to make the PP operative. The EnAM system chosen is LiAlO2 n*SiO2, which typically occurs in a Al-Ca-Mg slag system during metallurgical Li-ion-battery recycling. The service comprises a reproducible synthesis of the slag containing EnAM grains with a given composition as well as defined grain size. Furthermore, the solidified slag has to be tailored concerning particle size range and the particle size distribution prior to the supplying it within the PP. Additionally, it is necessary to provide fundamental information on the concentration and size (distribution) of the Li-EnAM-grains. This is all the service task of this central project. The research part of the central project focuses on two areas: metallurgical-engineering investigations and quantification of the metallurgical processing properties of Li-EnAM-system complementary to the service-synthesis and the ongoing development of 3D-geometallurgical characterization methods and their application to create a deep insight in the structure and the composition of the heterogeneous material structure of the Li-EnAM system. The fundamental engineering-metallurgical challenge aims at the influence of the processing and cooling parameters on the properties of the Li-EnAM, e.g. grain-size, grain-shape, yield, concentration or mechanical stability. The characterizing part aims at the development of a holistic characterization method for the EnAM, to quantify the 3D-structure, elemental and mineralogical composition of the solidified slag using 3D X-ray tomography. This will help to understand the distributed nature of volumetric crystallization und segregation effects. The image analysis of the tomograms is developed to deduct different particle and or grain related geometrical size and shape parameters. One further focus will be put on the determination of the 3D-intergrowth within the EnAM, e.g. the phase boundaries between individual grains.