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An Experimental Approach to Link Powder Physical Properties to 3D Particle Shape
Califice, Arnaud; Lumay, Geoffroy; Vandewalle, Nicolas et al.
2011In Particulate Systems Analysis 2011
 

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Keywords :
particle shape; flowability; packing density; 3D image analysis
Abstract :
[en] A series of samples have been characterized by 3D image analysis (using X-Ray microtomography). The samples consist of blends of metallic particles: steel shot abrasives (“balls”), steel fibres and angular steel grit particles. The blends were systematically prepared in different proportions of the raw products. Various shape and size parameters were measured on the particles: equivalent volume diameter (dV), maximum inscribed sphere diameter (dIN), particle length (maximum Feret diameter), particle elongation (El), particle flatness (Fl) etc. The results are expressed as statistical shape and size parameters, expressed both as volume and number weighted distributions. The blends have been tested for compaction using a cylindrical container which experiences a series of 500 free falls over a height of 3mm. The compaction dynamics was monitored using a sensor that measures the evolution of the solid volume fraction as a function of the tap number. From the obtained compaction curve, the Hausner ratio and a flowability index were extracted. The same blends have also been analysed using a rotating drum at different rotation speeds to analyze the evolution of the flowing angle. As the system is based on the analysis of a time sequence of 50 images (separated by 0.5 sec) it is possible to measure the intermittent character of the powder flow. The resulting measure is a cohesive index of the powder. The results obtained from physical testing were systematically plotted as a function of various statistical indices of the shape and size distributions in order to reveal correlations between particle shape properties and physical behaviour. Some clear trends appeared, demonstrating the influence of particle shape on powder physical properties.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Califice, Arnaud ;  Université de Liège - ULiège > Département Argenco : Secteur GeMMe > Géoressources minérales & Imagerie géologique
Lumay, Geoffroy ;  Université de Liège - ULiège > Département de physique > Physique statistique
Vandewalle, Nicolas  ;  Université de Liège - ULiège > Département de physique > Physique statistique
Pirard, Eric  ;  Université de Liège - ULiège > Département Argenco : Secteur GeMMe > Géoressources minérales & Imagerie géologique
Language :
English
Title :
An Experimental Approach to Link Powder Physical Properties to 3D Particle Shape
Publication date :
September 2011
Event name :
Particulate Systems Analysis 2011
Event organizer :
Royal Society of Chemistry
Event place :
Edinburgh, United Kingdom
Event date :
05-07 septembre 2011
Audience :
International
Main work title :
Particulate Systems Analysis 2011
Publisher :
Royal Society of Chemistry, London, United Kingdom
Available on ORBi :
since 27 October 2011

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