Development of a novel methodology to determine mill power draw

Bbosa, Lawrence Sidney; Govender, I.; Mainza, A.N.

doi:10.1016/j.minpro.2016.02.009

Cited by 20 publications

(13 citation statements)

References 14 publications

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“…Currently, Powell's model has been tested by many scholars on the basis of PEPT (positron emission particle tracking). 3,9,10 Hence, the power draw calculated by Morrell's theoretical model is small. Currently, advances in computing speed and power as well as improvements in programming (such as particle tracking technology), the determinations of COC (center of circulation), and COM (center of mass of charge) have become the key parameters to study the power draw of mill.…”

Section: Introductionmentioning

confidence: 94%

“…Currently, advances in computing speed and power as well as improvements in programming (such as particle tracking technology), the determinations of COC (center of circulation), and COM (center of mass of charge) have become the key parameters to study the power draw of mill. 1,3,11 Therefore, the mill load behavior highly depends on the liner shape and should be studied accurately. As the lifter wears, the reduction in its dimensions definitely results in the variation of the impact toe, bulk toe, and the position of shoulder and head.…”

Section: Introductionmentioning

confidence: 99%

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Discrete element method simulations of load behavior with mono-sized iron ore particles in a ball mill

Peng

Zhu

Zou

et al. 2017

Advances in Mechanical Engineering

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Aiming at addressing the load behavior of iron ore particles in a ball mill, a design of experimental method was used to define a series of discrete element method simulation conditions with two factors being the mill speed and lifter height. The key feature locations of impact toe, bulk toe, shoulder, and head positions were identified visually to determine the load behavior of the charge. To allow the irregular particle shape to be accurately determined, a quick and accurate sphere-clump method was employed in modeling the geometrical model of irregular shape. The results show that the dependence of the impact toe and head on mill speed is higher than its dependence on the lifter height with a correlation of 20.923 and 0.97, respectively. The shoulder changes approximately invariant with the mill speed and varies little with the lifter height. The bulk toe of particles appears to be invariant to the mill speed as well as the lifter height, resulting in the approximately same inclination of the chord joining the shoulder and bulk toe.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Discrete element method simulations of load behavior with mono-sized iron ore particles in a ball mill

Peng

Zhu

Zou

et al. 2017

Advances in Mechanical Engineering

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“…Using the DEM, the mixing process can be analyzed in detail without the need to design intricately a prototype and substantial experimental works. Studies dealing with the energy consumption during mixing processes in the rotary drums based on the DEM are also common [15,22] because it is an important design parameter for the motors of drum mixing systems. In most cases, it is taken for granted that the particles are of the same size and/or uniformly distributed and that no axial tilting for the rotary drum is needed.…”

Section: Introductionmentioning

confidence: 99%

DEM Investigation of the Influence of Particulate Properties and Operating Conditions on the Mixing Process in Rotary Drums: Part 2—Process Validation and Experimental Study

et al. 2020

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The process of homogenization of particulates is an indispensable part of many industrial processes, and, therefore, it is necessary to pay a special attention to this area and develop it. This paper deals with a complex study of homogenization of particulate matters in a rotary drum in terms of shape, size, and density of particles. In addition, the influence of operating parameters, such as drum filling capacity, rotational speed, and drum filling pattern are also investigated. Studies of reproducibility of discrete element method simulations, effects of rotary drum sizes or effects of drum volumetric filling to the mixture homogeneity index were also carried out. In general, the least satisfactory values of the homogeneity index resulted from the mixing of particles with different densities. The dominating factor of homogenization was the drum filling-up degree. The course of the homogeneity index in 140, 280, and 420 mm drums was very similar and after five revolutions of the drum, identical values of the homogeneity index were achieved for all the drum diameters. The optimal drum filling-up degree is at 40–50% for the spherical particles and 30–40% for the sharp-edged particles. The repeatability of simulations showed the maximum relative standard deviation of the homogeneity index at 0.6% from ten simulation repetitions with the same parametric conditions.

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“…With PEPT one can also find the shear rate distributions, but cannot directly access the shear stress. Recently PEPT has been used in the development of a power draw model based on the lever arm approach, Bbosa et al [4]. In this paper we use PEPT data in conjunction with a new granular flow model for the charge in the tumbling mill.…”

Section: Introductionmentioning

confidence: 99%