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Modelling of physical interactions between pulp, charge and mill structure in tumbling mills
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.ORCID-id: 0000-0003-0910-7990
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.ORCID-id: 0000-0002-8032-9388
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.ORCID-id: 0000-0002-7514-0513
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.ORCID-id: 0000-0002-3907-0802
2015 (engelsk)Konferansepaper, Oral presentation only (Fagfellevurdert)
Abstract [en]

To develop a tumbling mill model that includes the pulp fluid and its simultaneous interactions with both the charge and the mill structure is an interesting challenge. The interactions have previously been modelled for dry grinding with a combination of discrete element method (DEM) or smoothedparticle hydrodynamics (SPH) together with the finite element method (FEM). In such combination the DEM particles or SPH particles represent the grinding balls and FEM is used to model the mill structure. In this work, the previous model is extended to include fluids using SPH. Wet milling with water and a magnetite pulp, for graded and mono-size charges are numerically modelled and validated. The charge behaviour and its interaction with the mill structure are studied. An important part of the model is the coupling between DEM and SPH elements. Sliding and impact along the contacting interfaces are important for the response of the model. In the present work, the contact between the grinding balls and the pulp is realized using a penalty based “nodes to node” contact. The combined SPH-DEM-FEM model presented here can predict responses from the mill structure, as well as the pulp liquid flow and pressure. Validation is conducted by comparing numerical results with experimental measurements from grinding in an instrumented small-scale batch ball millequipped with an accurate torque meter. The simulated charge movement is also compared with high speed video of the charge movement for a number of cases. In conclusion, the SPH-DEM-FEM can predict the charge movement and driving torque with good agreement compared to experimental measurement for a wet tumbling mill process. In addition, the presented methodology is generic and can as well be applied to dry or wet stirred media mills of various configurations

sted, utgiver, år, opplag, sider
2015.
HSV kategori
Forskningsprogram
Hållfasthetslära; Mineralteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-38150Lokal ID: c74fcbd9-2eed-4755-ba21-eeaa795ff9d3OAI: oai:DiVA.org:ltu-38150DiVA, id: diva2:1011649
Konferanse
International Conference on Particle-Based Methods : 28/09/2015 - 30/09/2015
Merknad

Godkänd; 2015; 20150929 (parj)

Tilgjengelig fra: 2016-10-03 Laget: 2016-10-03 Sist oppdatert: 2018-04-12bibliografisk kontrollert

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http://congress.cimne.com/particles2015/admin/files/fileabstract/a379.pdf

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Jonsén, PärPålsson, BertilHäggblad, Hans-åkeGustafsson, Gustaf

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