Using positron emission particle tracking (PEPT) to investigate industrial systems

Govender, I., Morrison, A. J., Mainza, A., van der Westuizen, A., Franzidis, J.-P. and Powell, Malcolm (2010). Using positron emission particle tracking (PEPT) to investigate industrial systems. In: XXV International Mineral Processing Congress - IMPC 2010 "Smarter processing for the future". International Mineral Processing Congress 2010, Brisbane, QLD, Australia, (2843-2853). 6-10 September 2010.

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Author Govender, I.
Morrison, A. J.
Mainza, A.
van der Westuizen, A.
Franzidis, J.-P.
Powell, Malcolm
Title of paper Using positron emission particle tracking (PEPT) to investigate industrial systems
Conference name International Mineral Processing Congress 2010
Conference location Brisbane, QLD, Australia
Conference dates 6-10 September 2010
Convener Ralph J. Holmes
Proceedings title XXV International Mineral Processing Congress - IMPC 2010 "Smarter processing for the future"
Journal name XXV International Mineral Processing Congress 2010, IMPC 2010
Place of Publication Carlton, VIC, Australia
Publisher Australasian Institute of Mining and Metallurgy
Publication Year 2010
Sub-type Fully published paper
ISBN 9781921522284
1921522283
Volume 4
Issue 7
Start page 2843
End page 2853
Total pages 11
Collection year 2011
Language eng
Formatted Abstract/Summary
The motion of charge inside tumbling mills affects their power draw, liner wear, and material breakage and transport properties. It is therefore important to develop more accurate and fundamental models to describe charge dynamics inside tumbling mills if one is to improve their effectiveness and efficiency in the comminution process. In order to obtain the data from which to develop these models, it is necessary to ‘look inside’ the dynamic system. Positron Emission Particle Tracking (PEPT) is a nuclear imaging technique that effectively allows one to do just that for laboratory and pilot-scale rigs.

PEPT uses the products of a mode of radioactive decay called positron emission to triangulate the position of a tracer particle. The gamma rays produced by positron emitters are of such high energy that they will penetrate several centimetres of steel, and so PEPT can be used to track particles inside realistic laboratory and pilot-scale rigs.

The experimental mill (300 mm in diameter) was fi tted with pulp lifters and a discharge grate and run with rock particles and re-circulating slurry. Milling configurations spanned six lifter profiles, five loads and speeds between 55 and 100 per cent of critical. The data is a seminal look at the detailed motion of typical charge particles in wet and dry rotary mills with real media. The extended filming durations achieved with PEPT allow for statistically quantifiable behaviour that can be used to improve current models.

Three tracer sizes (1 mm, 2 mm and 4 mm) are analysed according to charge features (toe, shoulder, centre of circulation and centre of mass) typically employed in comminution modelling. The 1 mm tracer, run with the re-circulating slurry, provided seminal insights into slurry fl ow fields in both the main milling chamber and the pulp chamber.
© The Australasian Institute of Mining and Metallurgy 2010
Keyword Tumbling mills
PEPT
Imaging
SAG
Comminution
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Presented during Stream 4, Session 2D "2D.04" - "Mineral Characterisation & In Situ Analysis I", as Paper ID: 284.

 
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Created: Thu, 09 Dec 2010, 14:43:11 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre