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| Hauptseite > Publikationsdatenbank > Crystallisation characteristics and crystal phase quantification of a synthetic lignite gasifier slag system |
| Hauptseite > Publikationsdatenbank > Crystallisation characteristics and crystal phase quantification of a synthetic lignite gasifier slag system |
| Journal Article | FZJ-2020-01928 |
; ; ;
2020
Science Direct
New York, NY [u.a.]
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Please use a persistent id in citations: http://hdl.handle.net/2128/24837 doi:10.1016/j.fuproc.2020.106345
Abstract: The scope of this study is to investigate the crystallisation phenomenon of a synthetic SiO2-Al2O3-CaO-Fe2O3-MgO slag system. Firstly, the crystallised phases were predicted by thermodynamic equilibrium calculations. Subsequently, quenching experiments and confocal laser scanning microscope (CLSM) investigations were performed to validate the crystallisation characteristics of the synthetic slag system. Crystallisation kinetics was examined by isothermal quenching and continuous cooling CLSM experiments. The generated samples were analysed by microscopy, XRD, and SEM to determine the crystallised phases by their structure and chemical composition. A detailed insight of the evolution of crystal morphology growth was given. The shape of the two dominant phases: melilite and olivine were described and three-dimensional morphologies were defined for both phases. Additionally, the morphologies were quantified by length and aspect ratio measurements of individual crystals. The morphological information of the olivine and melilite phase, provided in this study, can be used as datasets for a viscosity model for partially crystallised slags. A conceptual viscosity model to be implemented in the next paper of this series, using specialised crystal morphology datasets, can serve a major contribution to forecast slag behaviour and to support the stability of industrial gasifier operation.
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