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Effect of particle properties on particle percolation behaviour in a packed bed / H.P. Zhu in Minerals engineering, Vol. 22 N° 11 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 961–969 Titre : Effect of particle properties on particle percolation behaviour in a packed bed Type de document : texte imprimé Auteurs : H.P. Zhu, Auteur ; M. Rahman, Auteur ; A. B. Yu, Auteur Année de publication : 2009 Article en page(s) : pp. 961–969 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Discrete  element  modelling  Particle  size  Mineral  processing  Process  control Résumé : Spontaneous inter-particle percolation is a very important phenomenon related to the mixing/segregation of particulate materials. Many studies have been conducted to understand the mechanisms governing the percolation behaviours in the past. However, previous work has a lack of systematic investigation on the effect of particle properties. In this work, a layer of small particles passing through a packed bed under gravity is analysed by means of the discrete element method. Percolation behaviour in terms of percolation velocity and radial dispersion is studied. The effect of percolating particle properties, including sliding friction and damping coefficients between percolating and packing particles, density and diameter ratios of percolating to packing particles and Young’s modulus of percolating particles, on the percolation behaviour is considered. It is observed that the damping coefficient and diameter ratio are the two dominant parameters that significantly affect the percolation behaviour. In particular, increasing the damping coefficient or decreasing the diameter ratio would increase the percolation velocity and decrease the radial dispersion. The sliding friction coefficient, Young’s modulus and density ratio have limited effects on the percolation behaviour. Two formulas have been, respectively, proposed to describe the dependences of percolation velocity and interaction force between percolating and packing particles on damping coefficient and diameter ratio. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000788 [article] Effect of particle properties on particle percolation behaviour in a packed bed [texte imprimé] / H.P. Zhu, Auteur ; M. Rahman, Auteur ; A. B. Yu, Auteur . - 2009 . - pp. 961–969. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 961–969 Mots-clés : Discrete  element  modelling  Particle  size  Mineral  processing  Process  control Résumé : Spontaneous inter-particle percolation is a very important phenomenon related to the mixing/segregation of particulate materials. Many studies have been conducted to understand the mechanisms governing the percolation behaviours in the past. However, previous work has a lack of systematic investigation on the effect of particle properties. In this work, a layer of small particles passing through a packed bed under gravity is analysed by means of the discrete element method. Percolation behaviour in terms of percolation velocity and radial dispersion is studied. The effect of percolating particle properties, including sliding friction and damping coefficients between percolating and packing particles, density and diameter ratios of percolating to packing particles and Young’s modulus of percolating particles, on the percolation behaviour is considered. It is observed that the damping coefficient and diameter ratio are the two dominant parameters that significantly affect the percolation behaviour. In particular, increasing the damping coefficient or decreasing the diameter ratio would increase the percolation velocity and decrease the radial dispersion. The sliding friction coefficient, Young’s modulus and density ratio have limited effects on the percolation behaviour. Two formulas have been, respectively, proposed to describe the dependences of percolation velocity and interaction force between percolating and packing particles on damping coefficient and diameter ratio. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000788

Experimental and numerical investigations of gouge formation related to blast furnace burden distribution / C.K. Ho in Minerals engineering, Vol. 22 N° 11 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 986–994 Titre : Experimental and numerical investigations of gouge formation related to blast furnace burden distribution Type de document : texte imprimé Auteurs : C.K. Ho, Auteur ; S.M. Wu, Auteur ; H.P. Zhu, Auteur Année de publication : 2009 Article en page(s) : pp. 986–994 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Discreet  element  modeling  Mineral  processing  Extractive  metallurgy  Process  control Résumé : This paper presents an experimental and numerical study of the gouge formation related to burden distribution in a BF. Physical experiments are conducted using a simplified bell-less charging model. The results indicate that the burden distribution is affected by particle properties such as density and size, and geometry of experimental set-up such as chute angle and distance between bin and chute. The gouge area generated is related to the ratio of the input energy from the top layer to the inertial energy from the base layer for the cases with red wooden balls, large glass beads and large steel balls. Numerical experiments are performed by means of the discrete element method. It is shown that the simulation model can reproduce the experimental results well. The weight ratio distribution is found to be largely affected by the densities of materials. The force structures are also analyzed to understand the fundamentals of the formation of the burden profiles. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000752 [article] Experimental and numerical investigations of gouge formation related to blast furnace burden distribution [texte imprimé] / C.K. Ho, Auteur ; S.M. Wu, Auteur ; H.P. Zhu, Auteur . - 2009 . - pp. 986–994. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 986–994 Mots-clés : Discreet  element  modeling  Mineral  processing  Extractive  metallurgy  Process  control Résumé : This paper presents an experimental and numerical study of the gouge formation related to burden distribution in a BF. Physical experiments are conducted using a simplified bell-less charging model. The results indicate that the burden distribution is affected by particle properties such as density and size, and geometry of experimental set-up such as chute angle and distance between bin and chute. The gouge area generated is related to the ratio of the input energy from the top layer to the inertial energy from the base layer for the cases with red wooden balls, large glass beads and large steel balls. Numerical experiments are performed by means of the discrete element method. It is shown that the simulation model can reproduce the experimental results well. The weight ratio distribution is found to be largely affected by the densities of materials. The force structures are also analyzed to understand the fundamentals of the formation of the burden profiles. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000752