Effect of spray dryer settings on the morphology of illite clay granules
DOI:
https://doi.org/10.17770/etr2015vol1.200Keywords:
clay, illite, Latvian clay powder, spray-drying, slurryAbstract
Spray drying is an effective and common method for powder drying, e.g. clay. The morphology and properties of spray dried granules depend on properties of slurry and operational conditions of spray dryer. The aim of this study was to investigate the effect of spray dryer settings on the morphology of illite clay granules.
Laboratory scale spray dryer was used. Operational conditions: inlet temperature 190-220˚C, outlet temperature 70-96˚C, spray dispersion is obtained using two-fluid nozzle where the slurry feed was varied from 4.5 to 15 ml/min and gas pressure 15-40 mm. Slurry was prepared from clay fraction under 2 µm without additives. Latvian illite clay from Iecava, Pavāri and Laža deposits was studied. Slurries with concentration 1, 8 and 15 mass% was used.The size and morphology was investigated by scanning electron microscopy, surface area and porosity by liquid nitrogen sorption.
All obtained granules irrespective of spray dryer settings were well-rounded and dense without large pores or holes, however the surface was rough. The mean diameter of granules was in range of 2.6-5.4 µm, depending on slurry feed rate. The surface area of produced granules mostly depended on clay composition and was in a range of 70-92 m2/g. Inlet temperature in a range of 190-220 °C was found to be appropriate to produce well dried clay granules (moisture content <10 wt%).
Downloads
References
A. B. D. Nandiyanto and K. Okuyama, “Progress in developing spray-drying methods for the production of controlled morphology particles: From the nanometer to submicrometer size ranges,” Adv. Powder Technol., vol. 22, no. 1, pp. 1–19, Jan. 2011.
R. Hughes and B. Bohor, “Random clay powders prepared by spray-drying,” Am. Mineral., vol. 55, pp. 1780–1786, 1970.
I. Dušenkova, “Latvijas mālu sagatavošanas tehnoloģijas izstrāde un īpašību pētījumi izmantošanai kosmētiskajos produktos,” Rīgas Tehniskā universitāte, 2014.
V. Lakevičs, V. Stepanova, I. Skuja, I. Dušenkova, and A. Ruplis, “Influence of Alkali and Acidic Treatment on Sorption Properties of Latvian Illite Clays,” Key Eng. Mater., vol. 604, pp. 71–74, Mar. 2014.
R. a. Alvarez-Puebla, D. S. Dos Santos, C. Blanco, J. C. Echeverria, and J. J. Garrido, “Particle and surface characterization of a natural illite and study of its copper retention,” J. Colloid Interface Sci., vol. 285, pp. 41–49, 2005.
I. Dusenkova, “Rheological properties of Latvian illite clays,” Acta Geodyn. Geomater., vol. 10, no. 4, pp. 459–464, Nov. 2013.
F. Wypych and K. G. Satyanarayana, Eds., Clay Surfaces. Fundamentals and Applications. London: Elsevier Academic Press, 2004, p. 567.
R. Mondragon, J. C. Jarque, J. E. Julia, L. Hernandez, and A. Barba, “Effect of slurry properties and operational conditions on the structure and properties of porcelain tile granules dried in an acoustic levitator,” J. Eur. Ceram. Soc., vol. 32, no. 1, pp. 59–70, Jan. 2012.
