Experimental and discrete element modelling of cohesive iron ore fines

J. P. Morrissey, J. Y. Ooi, J. F. Chen, K. Tano, G. Horrigmoe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the behaviour of iron ore fines with varying levels of adhesion was investigated using a confined compression test and a uniaxial test. The uniaxial test was conducted using the semi-automated uniaxial EPT tester in which the cohesive strength of a bulk solid is evaluated from an unconfined compression test following a period of consolidation to a pre-defined vertical stress. The iron ore fines were also tested by measuring both the vertical and circumferential strains on the cylindrical container walls under vertical loading in a separate confined compression tester - the K0 tester, to determine the lateral pressure ratio. Discrete Element Method simulations of both experiments were carried out and the predictions were compared with the experimental observations. A recently developed DEM contact model for cohesive solids, an Elasto-Plastic Adhesive model, was used. This particle contact model uses hysteretic non-linear loading and unloading paths and an adhesion parameter which is a function of the maximum contact overlap. The model parameters for the simulations are phenomenologically based to reproduce the key bulk characteristics exhibited by the solid. The simulation results show a good agreement in capturing the stress history dependent behaviour depicted by the flow function of the cohesive iron ore fines while also providing a reasonably good match for the lateral pressure ratio observed during the confined compression K0 tests. This demonstrates the potential for the DEM model to be used in the simulation of bulk handling applications.

Original languageEnglish
Title of host publicationParticle-Based Methods III: Fundamentals and Applications - Proceedings of the 3rd International Conference on Particle-based MethodsFundamentals and Applications, Particles 2013
Pages224-235
Number of pages12
Publication statusPublished - 2013
Event3rd International Conference on Particle-Based Methods Fundamentals and Applications, Particles 2013 - Stuttgart, Germany
Duration: 18 Sep 201320 Sep 2013

Conference

Conference3rd International Conference on Particle-Based Methods Fundamentals and Applications, Particles 2013
CountryGermany
CityStuttgart
Period18/09/201320/09/2013

Keywords

  • Cohesive solid
  • DEM
  • Discrete element method
  • Flow function
  • Granular materials
  • Iron ore fines
  • Uniaxial test

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Experimental and discrete element modelling of cohesive iron ore fines'. Together they form a unique fingerprint.

Cite this