Particle modeling simulation of thermal effects on ore breakage

Wang, Ge; Radziszewski, Peter; Ouellet, J.

doi:10.1016/j.commatsci.2008.02.005

Cited by 46 publications

(25 citation statements)

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“…The efficacy of this mechanism and the amenability of ores to microwave-induced fracture has been shown to depend on the dielectric, thermal and mechanical properties of the minerals involved, their assemblage within the ores, and the microwave energy and power density applied Bradshaw, 2009, 2010;Jones et al, 2007;Kingman et al, 2000b;Wang et al, 2008;Wang and Djordjevic, 2014;Whittles et al, 2003). In particular, highly microwave-absorbent phases (such as nickel, copper, iron and lead sulphides, and magnetite) with a grain size d50 greater than approximately 500µm constrained by a hard matrix (such as quartz, feldspar, pyroxene and olivine) have been shown to provide the largest reductions in ore competency (Batchelor et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Increasing the grind size for effective liberation and flotation of a porphyry copper ore by microwave treatment

Jones

Plint

Kingman

2016

Minerals Engineering

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The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Minerals Engineering 94 (2016) AbstractIn this paper, mineralogy, grain size, dissemination, textural consistency and mineral associations were determined for a commercially exploited porphyry copper ore using a Mineral Liberation Analyser (MLA). The ore was subjected to high power density microwave treatments in a single mode cavity at 15kW and approximately 2kWh/t. The untreated and microwave-treated samples were subsequently milled to two grind sizes near the nominal plant grind size and a size-by-liberation analysis performed. The analysis revealed that equivalent liberation could be obtained at a grind size approximately 50-60µm coarser than the nominal plant grind due to the microwave treatment. Flotation testing indicated that an increase in copper recovery of approximately 1% could be achieved, or that a grind size increase of approximately 30µm may potentially yield equivalent copper recovery due to the microwave-enhanced liberation observed. However, statistical analyses demonstrated that it is difficult to attain confidence in recovery increases of approximately 1% even when conducting batch flotation tests in triplicate. The ore under investigation had previously been shown to produce only modest average reductions in strength (~8%) under similar microwave treatment conditions due to a prevalence of many unfavourable textures. However, the preferential association of copper minerals with a hard matrix mineral (quartz) and a hard microwaveabsorbent mineral (pyrite) resulted in a significant change in liberation behaviour. Minerals Engineering 94 (2016) 61-752 http://dx

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Section: Introductionmentioning

confidence: 99%

Increasing the grind size for effective liberation and flotation of a porphyry copper ore by microwave treatment

Jones

Plint

Kingman

2016

Minerals Engineering

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“…d P is input power density (W/m 3 ). Figure 5 exhibits a preliminary HLPM simulation of microwave assisted breakage effect on a calcite-pyrite mixture [32]. In the simulation, the thermally-induced microcracking is found to be along the grain boundaries.…”

Section: Thermal Hlpmmentioning

confidence: 99%

“…To readily describe the breakage effect on material, we define a concept of fracture density [32]. By this definition, the local fracture density of particle i, Here is pointed out that, in the simulation, the Poisson's ratio of epoxy was set to 1/3.…”

Section: Prediction Of Crack Pattern In Epoxy Platementioning

confidence: 99%

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Hybrid Lattice Particle Modelling Approach for Polymeric Materials Subject to High Strain Rate Loads

et al. 2010

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Hybrid Lattice Particle modelling (HLPM) is an innovative particular dynamics approach that is established based on a combination of the particle modelling (PM) technique together with the conventional lattice modelling (LM) theory. It is developed for the purpose of simulating the dynamic fragmentation of solids under high strain rate loadings at macroscales with a varying Poisson's ratio. HLPM is conceptually illustrated by fully dynamic particles (or -quasi-particles‖) placed at the nodes of a lattice network without explicitly considering their geometric size. The interaction potentials among the particles can employ either linear (quadratic) or nonlinear (Leonard-Jones or strain rate dependent polynomial) type as the axial/angular linkage. The defined spring constants are then mapped into lattice system, which are in turn matched with the material's continuum-level elastic moduli, strength, Poisson's ratio and mass density. As an accurate dynamic fracture solver of materials, HLPM has its unique advantages over the other numerical techniques which are mainly characterized as easy preparation of inputs, high computation efficiency, ability of post-fracture simulation and a multiscale model, etc., This paper is to review the successful HLPM studies of dynamic fragmentation of polymeric materials with good accuracy. Polymeric materials, including nylon 6-6, vinyl OPEN ACCESSPolymers 2010, 2 4 ester and epoxy, are accounted for under the loading conditions of tension, indentation and punctuation. In addition, HLPM of wave propagation and wave induced fracture study is also reviewed.

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“…Yicai Wang [20] and Qin Like et al [21] investigated temperature and stress distribution characteristics in monocrystal minerals using FEM. Ge Wang [22] and A.Y. Ali et al [23] discussed the distribution characteristics of microcracks in minerals using the discrete element method (DEM).…”

Section: Introductionmentioning

confidence: 99%

Analysis on the growth of different shapes of mineral microcracks in microwave field

Like¹,

Dai²

2016

Frattura Ed Integrità Strutturale

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ABSTRACT. Microwave heating-assisted ore grinding and crushing can effectively increase the dissociation energy of minerals and decrease energy consumption. Microcrack growth and distribution characteristics inside different shapes of ore particles, which are composed of galena and calcite under microwave irradiation, were analyzed using discrete element method to explore the effects of mineral shapes on microwave-assisted dissociation. Growth laws on the total number of microcracks, numbers of microcracks in galena and calcite, and boundary damage rate against irradiation time under high power and low power were studied. Research results demonstrated that mineral shape mainly affects the quantity of microcracks inside ores but does not their growth law.

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Particle modeling simulation of thermal effects on ore breakage

Cited by 46 publications

References 10 publications

Increasing the grind size for effective liberation and flotation of a porphyry copper ore by microwave treatment

Increasing the grind size for effective liberation and flotation of a porphyry copper ore by microwave treatment

Hybrid Lattice Particle Modelling Approach for Polymeric Materials Subject to High Strain Rate Loads

Analysis on the growth of different shapes of mineral microcracks in microwave field

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