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Urea Finishing Process: Prilling versus Granulation

Rahmanian, Nejat, Naderi, Sina, Šupuk, Enes, Abbas, Rafid and Hassanpour, Ali (2014) Urea Finishing Process: Prilling versus Granulation. Procedia Engineering: The 7th World Congress on Particle Technology (WCPT7) - Elsevier, 102. pp. 174-181. ISSN 1877-7058

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Solid urea is the largest nitrogen fertilizer product which is produced in two forms of granules and prills. Although the chemical properties of both prills and granules remain similar, their different physical and mechanical properties are distinguishable and make them suitable for different application either as fertilizer or raw materials for chemical industry. The objective of this work is to analyses physical and mechanical properties of urea granules produced in two different plants in Malaysia using fluidized bed process and compare them with the imported urea prills to the country; hence make a process-product relationship for urea finishing processes. Results of size distribution of the samples show that the most of the granules fall in the size range between 2.40 and 3.50 mm, whereas the prills size is around 1.60 mm. Strength measurement using side crushing test also shows that the prills with the average failure load of 3.80 N remain significantly weaker than the granules with failure load of 10-17 N. Strength distribution of the particles also shows that a more uniform strength distribution is observed for the prills than the granules. It is concluded that the urea prilling process is the finishing process which produces the weaker and the more uniform size and strength of the particles than the fluidized-bed granulation process.

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Item Type: Article
Uncontrolled Keywords: Urea; Prills; Granules; Prilling; Strength
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Q Science > QD Chemistry
Schools: School of Applied Sciences
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References: [1] J. N. Galloway, J. D. Aber, J. W Erisman, S. P. Seitzinger, R. W. Howarth, E. B. Cowling and B. J. Cosby, "The nitrogen cascade. BioScience" 53(4): 341–356, 2003. [2] J. N. Galloway, W. H. Schlesinger, I. I. H. Levy, A. Michaels and J. L. Schnoor, "Nitrogen fixation: anthropogenic enhancement – environmental response. Global Biogeochem. Cycles" 9: 235–252, 1995. [3] G. Andrews, "Gardening and water quality protection: understanding nitrogen fertilizers", Oregon State University, 1998. [4] R. Howarth, D. Anderson, J. Cloern, C. Elfring, C. Hopkinson, B. Lapointe, T. Malone, N. Marcus, K. McGlathery, A. Sharpley and D. Walker, "Nutrient pollution of coastal rivers, bays, and seas. Issues in Ecology", 7: 1–15, 2000. [5] V. Smil, "Enriching the Earth: Fritz Haber, Carl Bosch, and the Transformation of World Food", The MIT Press, Cambridge, United Kingdom, 2001. [6] J. N. Galloway and E. B. Cowling. "Nitrogen and the world Ambio" 31: 64–71, 2002. [7] R. W. Howarth, A. Sharpley and D. Walker. "Sources of nutrient pollution to coastal waters in the United States: Implications for achieving coastal water quality goals", Estuaries 25: 656–676, 2002. [8] N. Nosengo 2003. Fertilized to death. Nature 425: 894–895. [9] K. M. Constant and W. F. Sheldrick. "World Nitrogen Survey. World Bank Technical paper 174", Washington, District of Columbia, 1992. [10] FAO, "FAOSTAT Database Collection ( Food and Agriculture, Organization of the United Nations", Rome, Italy, 2001. [11] A. Alamdari, A. Jahanmiri, N. Rahmaniyan, "Mathematical modeling of the urea prilling process", Chemical Engineering Communication, 178, 185-198, 2001. [12] N. Rahmanian, M. Homayoonfard, A. Alamdari, "Simulation of urea prilling process: An industrial case study", Chemical Engineering Communication" 200 (6): 1-19, 2013. [13] M. Aadil, N. Rahmanian, R. Pendyala, "Analysis of fluid flow of urea in a perforated rotating bucket: single orifice case" Journal of Applied Sciences, 65: 3474–3484, 2013. [14] N. Rahmanian, A. Naji, and M. Ghadiri. "Effect of process parameters on the granule properties made in a high shear granulator", Chemical Engineering Research and Design, 89(5): 512–518, 2011. [15] M. Aadil, N. Rahmanian, R. Pendyala, "Analysis of fluid flow of urea in a perforated rotating bucket", App. Mech and Materials, 372: 340–345, 2013. [16] Steward A. Baba, "Characterisation of strength and structure of granular and prilled urea fertilizer", Final year project report, University Teknologi Petronas, 2012. [17] P. M. Schaber, J. Colson, S. Higgins, D. Thelen, B. Anspach, J. Brauer, "Thermal decompostion (pyrolysis) of urea in an open reaction vessel", Thermochimica acta, 424: 131–142, 2004. [18] J.P. Chen, K. Isa, "Themal decomposition of urea and urea derivatives by simultaneous TG/(DTA)/MS", Mass Spectrom. Soc. Jpn., 46: 299–303, 1998.
Depositing User: Enes Supuk
Date Deposited: 01 Jul 2014 16:01
Last Modified: 28 Aug 2021 19:08


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