University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Analysis of milling of dry compacted ribbons by distinct element method

Hare, Colin, Ghadiri, M, Guillard, N, Bosworth, T and Egan, G (2016) Analysis of milling of dry compacted ribbons by distinct element method Chemical Engineering Science, 149. pp. 204-214.

[img]
Preview
Text
1-s2.0-S0009250916302044-main.pdf - Version of Record

Download (2MB) | Preview
[img]
Preview
Text (licence)
SRI_deposit_agreement.pdf
Available under License : See the attached licence file.

Download (33kB) | Preview
[img] Text
manuscript.docx - Accepted version Manuscript
Restricted to Repository staff only
Available under License : See the attached licence file.

Download (2MB)

Abstract

Fine cohesive powders are often dry granulated to improve their flowability. Roller compaction is commonly used to produce dense ribbons which are then milled. The material properties of the powder and the conditions in the roller compactor affect the strength of the ribbons, however there is no method in the literature to predict the size distribution of the product of ribbon milling. Here we introduce a method, by using the Distinct Element Method (DEM) to determine the prevailing impact velocities and stresses in the mill, with bonded spheres representing the ribbons. The bond strength is calibrated by matching experimental results of three point bend measurements and predictions from numerical simulations. The ribbons are then exposed to the dynamic conditions predicted by the DEM, by dropping them from a controlled height to cause fragmentation, and subsequently stressing them in a shear cell under the conditions again predicted by the DEM. The fragments are sheared under these conditions to represent repeated passage of bars over the fragments at the mill base. Sieve analysis is used here to determine the particle size distribution under given mill conditions. The predicted size distribution of the mill product compares well with the plant data. It is found that the mill speed and length of ribbons fed to the mill have no significant influence on the product size distribution for the range tested.

Item Type: Article
Subjects : Chemical and Process Engineering
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Hare, Colinc.hare@surrey.ac.ukUNSPECIFIED
Ghadiri, MUNSPECIFIEDUNSPECIFIED
Guillard, NUNSPECIFIEDUNSPECIFIED
Bosworth, TUNSPECIFIEDUNSPECIFIED
Egan, GUNSPECIFIEDUNSPECIFIED
Date : 22 April 2016
Identification Number : 10.1016/j.ces.2016.04.041
Copyright Disclaimer : Copyright 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords : DEM, Stress distribution, shearing, breakage, non-spherical
Depositing User : Symplectic Elements
Date Deposited : 13 May 2016 14:13
Last Modified : 04 Aug 2017 11:34
URI: http://epubs.surrey.ac.uk/id/eprint/810522

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800