Drum granulation of NPK fertilizers

Gavin Walker, C.R. Holland, M.N. Ahmad, J.N. Fox, A.G. Kells

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Nitrate-based NPK fertilizer was granulated in a bench scale drum granulation unit. The initial fertilizer possessed a particle size distribution similar to those in industrial granulation units. In this work, three factors are identified affecting the degree of fertilizer granulation, these are solution to solid phase ratio, the binder viscosity and the optimal rotation speed of the drum. Experimental results indicate that a critical solution to solid phase ratio is required for an increase in granulation in terms of mass median diameter. The saturated solution viscosity in this system was measured and correlated well to binder viscosity granulation theory with the critical Stokes number calculated at 700. The optimum rotation speed for flighted and unflighted drums correlated with the Froude number relationship for full scale granulation units. (C) 2000 Elsevier Science S.A. All rights reserved.
Original languageEnglish
Pages (from-to)282-288
Number of pages7
JournalPowder Technology
Issue number3
Publication statusPublished - 01 Feb 2000

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Drum granulation of NPK fertilizers'. Together they form a unique fingerprint.

Cite this