The Analytical centrifuge – an additional tool to optimize ceramic slurries for spray drying

  • Spray drying is a widely used process step in ceramic technology to convert fine grained raw powders to free-flowing granules. Type and amount of the organic additives (dispersants, binders and plasticizers) define viscosity and stability of the slurry, the granulate structure and the compaction behaviour. Alumina and Zirconia powders were characterized with regard to particle size, shape and specific surface area (BET). Zeta-potential measurements by Stabino® were used to investigate the effect of different dispersants on slurry stability. Unfortunately, this method is restricted to suspensions with less than about 30% by weight of solid content. The multi-sample analytical centrifuge LUMiSizer® overcomes this problem. This device enables analysis of the separation behaviour of suspensions over a wide range of solid content. On the basis of position and time resolved photometric detection of transmitted light, it is possible to determine the instability index, theSpray drying is a widely used process step in ceramic technology to convert fine grained raw powders to free-flowing granules. Type and amount of the organic additives (dispersants, binders and plasticizers) define viscosity and stability of the slurry, the granulate structure and the compaction behaviour. Alumina and Zirconia powders were characterized with regard to particle size, shape and specific surface area (BET). Zeta-potential measurements by Stabino® were used to investigate the effect of different dispersants on slurry stability. Unfortunately, this method is restricted to suspensions with less than about 30% by weight of solid content. The multi-sample analytical centrifuge LUMiSizer® overcomes this problem. This device enables analysis of the separation behaviour of suspensions over a wide range of solid content. On the basis of position and time resolved photometric detection of transmitted light, it is possible to determine the instability index, the sedimentation velocity, and the sediment height in dependence of type and amount of organic additives at various centrifugal accelerations. Additional information is obtained from the shape of the transmission profiles. Based on LUMiSizer® measurements, suitable additive concentrations were derived. Thereby, the number of investigations by viscometry and spray drying experiments can be significantly reduced. Finally, it was possible to produce alumina, zirconia and ZTA aqueous slurries with up to 80 weight-% of solid. The optimized suspensions were successfully spray dried and the resulted granules show good compaction behaviour.zeige mehrzeige weniger

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Autoren/innen:Petra Kuchenbecker
Koautoren/innen:Wolfgang Güther, Franziska Lindemann, Patrick Höhne, Christian Neumann, Torsten Rabe
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2016
Organisationseinheit der BAM:5 Werkstofftechnik
5 Werkstofftechnik / 5.5 Technische Keramik
DDC-Klassifikation:Naturwissenschaften und Mathematik / Chemie / Analytische Chemie
Freie Schlagwörter:Analytical centrifuge; Ceramic suspension; Granules; Slurry; Spray drying
Themenfelder/Aktivitätsfelder der BAM:Analytical Sciences
Veranstaltung:Jahrestagung der Deutschen Keramischen Gesellschaft und Symposium Hochleistungskeramik
Veranstaltungsort:Freiberg, Germany
Beginndatum der Veranstaltung:07.03.2016
Enddatum der Veranstaltung:09.03.2016
Verfügbarkeit des Volltexts:Volltext-PDF im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.05.2016
Referierte Publikation:Nein