Discrete-element simulations of comminution in rotating drums: Effects of grinding media

Orozco, Luisa Fernanda; Nguyen, Duc-Hanh; Delenne, Jean‐Yves; Sornay, Philippe; Radjaï, Farhang

doi:10.1016/j.powtec.2019.12.014

Cited by 28 publications

(19 citation statements)

References 42 publications

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“…In the BCM, each particle is subdivided into smaller independent primary elements or cells by means of a Voronoï tessellation, and thus the particle volume is exactly equal to the sum of cell volumes [26,27,29,30,34]. During the generation process, the average cell size d cell is fixed, but the cell shapes are random.…”

Section: A Contact Dynamics Methods and Bcmmentioning

confidence: 99%

“…In this paper, we use numerical simulations to investigate the effect of system parameters on the grinding process in a 2D rotating drum. We rely on the contact dynamics method as a DEM algorithm and the discretization of the particles into bonded polygonal cells that an break apart, known as Bonded Cell Method (BCM) [10,[26][27][28][29][30]. The particles can thus break into fragments of different sizes down to the smallest cell size.…”

Section: Introductionmentioning

confidence: 99%

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Scaling behavior of particle breakage in granular flows inside rotating drums

et al. 2020

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We perform systematic particle dynamics simulations of granular flows composed of breakable particles in a 2D rotating drum to investigate the evolution of the mean particle size and specific surface as a function of system parameters such as drum size, rotation speed, filling degree, and particle shape and size. The specific surface increases at a nearly constant rate up to a point where particle breakage begins to slow down. The rates of particle breakage for all values of system parameters are found to collapse on a master curve when the times are scaled by the characteristic time defined in the linear regime. We determine the characteristic time as a function of all system parameters, and we show that the rate of particle breakage can be expressed as a linear function of a general scaling parameter that incorporates all our system parameters. This scaling behavior provides a general framework for the upscaling of drum grinding process from laboratory to industrial scale.

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Section: A Contact Dynamics Methods and Bcmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scaling behavior of particle breakage in granular flows inside rotating drums

et al. 2020

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“…Reduced milling performance with an increase in κ br was established. In [11], DEM and the linked cell method were used to analytically assess the effect of κ br on grinding in tumbling mills. Increased productivity was detected, with an increase in κ br , due to an increase in the kinetic energy of grinding bodies.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Establishing the effect of a simultaneous reduction in the filling load inside a chamber and in the content of the crushed material on the energy intensity of self-oscillatory grinding in a tumbling mill

Deineka¹,

Naumenko²

2021

EEJET

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The effect of a simultaneous change in the degree of filling a chamber with load κbr and in the content of the crushed material κmbgr on the efficiency of the self-oscillatory grinding process has been estimated. Using a method of numerical modeling based on the results of experimental visualization of the flow has helped establish an emergent dynamic effect of the sharp increase in the self-oscillatory action of two-faction loading at a joint reduction in κbr and κmbgr. A significant decrease in the passive quasi-solid loading motion zone has been detected, as well as an increase in the active pulsation zone and a growth of dilatancy. The manifestation of the effect is enhanced by the simultaneous interaction of increasing the scope of self-oscillations and weakening the coherent properties of particles in a loose large fraction under the influence of the particles of fine fraction. A significant decrease in the values of the inertial loading parameters has been established: maximum dilatancy υmax, the relative scale of self-oscillations ψRυ, the maximum share of the active part of κfammax, and the generalized complex degree of dynamic activation Ka. A 2.65-time growth of υmax was detected, ψRυ increased by 5 times, κfammax ‒ by 4.36 times, Ka ‒ by 18.4 times, at a joint decrease in κbr from 0.45 to 0.25, in κmbgr ‒ from 1 to 0. The synergistic technological effect of a sharp decrease in the specific energy intensity Еo/Еs has been established, as well as an increase in the relative performance Co/Cs in the self-oscillatory grinding, due to a significant increase in the dynamic action of loading, which is exacerbated by the joint interaction of reduced κbr and κmbgr. The process of the self-oscillatory grinding of cement clinker has been investigated. A 62 % reduction in Еo/Еs and a 125 % increase in Co/Cs were detected at a joint decrease in κbr from 0.45 to 0.25, in κmbgr ‒ from 1 to 0.125. The established effects make it possible to substantiate the parameters for the energy-efficient self-oscillatory process of grinding in tumbling mills with a conventional structure

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“…In [22], a combination of PEPT and DEM was used to study the grinding media dynamics in a vertical attritor mill. Particle breakage in a ball mill is modeled using DEM and a bonded-cell method in [23]. In [24], a DEM model is used to study a batch vertical stirred mill.…”

Section: Introductionmentioning

confidence: 99%

A Novel Particle-Based Approach for Modeling a Wet Vertical Stirred Media Mill

et al. 2021

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Modeling of wet stirred media mill processes is challenging since it requires the simultaneous modeling of the complex multiphysics in the interactions between grinding media, the moving internal agitator elements, and the grinding fluid. In the present study, a multiphysics model of an HIG5 pilot vertical stirred media mill with a nominal power of 7.5 kW is developed. The model is based on a particle-based coupled solver approach, where the grinding fluid is modeled with the particle finite element method (PFEM), the grinding media are modeled with the discrete element method (DEM), and the mill structure is modeled with the finite element method (FEM). The interactions between the different constituents are treated by loose (or weak) two-way couplings between the PFEM, DEM, and FEM models. Both water and a mineral slurry are used as grinding fluids, and they are modeled as Newtonian and non-Newtonian fluids, respectively. In the present work, a novel approach for transferring forces between grinding fluid and grinding media based on the Reynolds number is implemented. This force transfer is realized by specifying the drag coefficient as a function of the Reynolds number. The stirred media mill model is used to predict the mill power consumption, dynamics of both grinding fluid and grinding media, interparticle contacts of the grinding media, and the wear development on the mill structure. The numerical results obtained within the present study show good agreement with experimental measurements.

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Discrete-element simulations of comminution in rotating drums: Effects of grinding media

Cited by 28 publications

References 42 publications

Scaling behavior of particle breakage in granular flows inside rotating drums

Scaling behavior of particle breakage in granular flows inside rotating drums

Establishing the effect of a simultaneous reduction in the filling load inside a chamber and in the content of the crushed material on the energy intensity of self-oscillatory grinding in a tumbling mill

A Novel Particle-Based Approach for Modeling a Wet Vertical Stirred Media Mill

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