MODPULP - Modelling of the interaction between charge and lining in tumbling mills

Published: 15 January 2010

The main scientific objective of this project is to build physically realistic numerical models for the grinding of materials in tumbling mills. This is of major importance for product development and optimisation of process behaviour. It will also give possibilities to understand the physical and mechanical behaviour of particulate material systems during grinding in a tumbling milling. This is also important in order to develop future high quality mineral products.

The project ModPulp focuses on methods for modelling of the grinding process with a combination of structural and particle based numerical method. A combined use of advanced measuring techniques as well as the use of both empirical and fundamental mathematical modelling applied on mineral processes. Step by step the complexity of the physical model is increased. Models for the mill structure, the charge and the slurry behaviour are added to a global response model. An important and necessary condition is that the all steps in the development of the models are validated against experimental results. The first model for the interaction between the charge and the structure is already obtained and results are validated against experimental data. Results also show a good correlation between experimental measurements and numerical models. The new models give the opportunity study the influence of the whole mill structure. Chock waves from the collisions between the particle and the lining can be traced and understand. Predict forces travelling in the lining and by that makes modelling of on-shell sensor systems possible. Another opportunity is the possibility to predict wear and fatigue properties which are important properties for industrial milling.

So far the project is on time and the results are good and give the industrial partners a numerical tool that connects the charge motion to the response from mill structure. The project contributes to gruvforsknings programmet with a unique model for the interaction between the charge, slurry and mill structure. This knowledge can be used to understand the dynamic response of the mill and to optimizing the grinding process. The project takes modelling of grinding into the area of physically realistic modelling.

 

Project leader and researcher: Pär Jonsén

Researchers: Bertil Pålsson and Hans-Åke Häggblad

Industrial researchers: Kent Tano LKAB and Andreas Berggren Boliden Minerals