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Prediction of mill structure behaviour in a tumbling mill
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
Technology and Development, Boliden Minerals, SE-93681 Boliden, Sweden.
2010 (English)In: Conference in Minerals Engineering: Luleå, 2 -3 februari 2010 / [ed] Johanna Alatalo, Luleå: Luleå tekniska universitet, 2010, 85-98 p.Conference paper (Other academic)
Abstract [en]

Computational demands and the lack of detailed experimental verification have limited the value of Distinct Element Method (DEM) modelling approaches in mill simulation studies. This paper presents the results of a study in which the deflection of a lifter bar in a pilot ball mill is measured by an embedded strain gauge sensor and compared to deflections predicted from finite element (FE) simulations. The flexible rubber lifter and the lining in a tumbling mill are modelled with the finite element method (FEM) and the grinding medium modelled with DEM. The deflection profile obtained from DEM-FE simulation shows a reasonably good correspondence to pilot mill measurements. To study the charge impact on the mill structure two different charges are used in the simulations. The approach presented here is a contribution to the validation of DEM-FE simulations and an introduction to the description of a bendable rubber lifter implemented in a DEM-FEM mill model. It opens up the possibility to predict contact forces for varying mill dimensions and liner combinations. FEM is especially valuable in this case, since there are readily available libraries with material models. This is a follow-up work to previous preliminary result from a mono-size ball charge interaction study.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2010. 85-98 p.
Research subject
Solid Mechanics; Mineral Processing
URN: urn:nbn:se:ltu:diva-39835Local ID: ebaf1560-5950-11df-b6eb-000ea68e967bISBN: 978-91-7439-097-1 (PDF)OAI: diva2:1013354
Konferens i mineralteknik 2010 : 02/02/2010 - 03/02/2010
Godkänd; 2010; 20100506 (parj)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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