Exploring ball size distribution in coal grinding mills

Bwalya, Murray M.; Moys, M.H.; Finnie, G. J.; Mulenga, François K.

doi:10.1016/j.powtec.2014.02.044

Cited by 34 publications

(20 citation statements)

References 10 publications

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“…Small balls (20 mm) were found to constitute make-up balls which produced the highest amount of M 2 and this was thought to have been caused by the feed which generally consist of smaller particles. The findings in this work also reinforce the propositions by Bond [9]; Bwalya et al [7] which recommended charging mono-sized balls in the make-up charge. Although 20 mm balls produced the maximum amount of M 2 , the insignificant difference in the amounts of M 2 produced suggested that it would be advantageous to charge 40 mm balls as make-up charge.…”

Section: Resultssupporting

confidence: 90%

“…This trend is observed in all cases in which the smallest monosized balls in the make-up form a ball size distribution that leads to the production of the largest amount of M 2 . This is in line with the recommendations made by Bond [9] and Bwalya et al [7] to feed a mono-sized ball charge. However, Cho et al [1] proposed a mix of two ball sizes as the optimum mix.…”

Section: Effects Of Ball Size Distribution On the Production Of The Fsupporting

confidence: 90%

“…Several researchers have proposed make-up charge policies; the underlying idea has been to maintain a steady balanced ball mill charge. The following sequel of work indicates the important milestones achieved over the years: Austin et al [3]; Austin and Klimpel [4]; Menacho and Concha [5,6]; Austin and Concha [2]); Bwalya et al [7]; Cho et al [1]; and Rivera Madrid et al [8].…”

Section: Introductionmentioning

confidence: 99%

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Ball size distribution for the maximum production of a narrowly-sized mill product

2015

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Section: Resultssupporting

confidence: 90%

Section: Effects Of Ball Size Distribution On the Production Of The Fsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Ball size distribution for the maximum production of a narrowly-sized mill product

2015

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“…When the coal load exceeds the optimum value, the balls' impact strength gradually decreases, and their grinding effect on coal loads plays a leading role. Because it is influenced by the ball's diameter and the coal particle's diameter, the optimal coal load possesses different functional values [12,13]. …”

Section: Effects Of Db = 004 M and N004 = 86mentioning

confidence: 99%

“…Central difference method is always used to do numerical integration for Equation (12), and it could obtain the updated speed which is expressed by the intermediate point of two iterative time steps, which is as follows:…”

Section: Modeling Sectionmentioning

confidence: 99%

Modeling on the Effect of Coal Loads on Kinetic Energy of Balls for Ball Mills

Bai

2015

Energies

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This paper presents a solution for the detection and control of coal loads that is more accurate and convenient than those currently used. To date, no research has addressed the use of a grinding medium as the controlled parameter. To improve the accuracy of the coal load detection based on the kinetic energy of balls in a tubular ball mill, a Discrete Element Method (DEM) model for ball kinematics based on coal loads is proposed. The operating process for a ball mill and the ball motion, as influenced by the coal quality and the coal load, was analyzed carefully. The relationship between the operating efficiency of a coal pulverizing system, coal loads, and the balls' kinetic energy was obtained. Origin and Matlab were utilized to draw the variation of parameters with increasing coal loads in the projectile and cascading motion states. The parameters include the balls' real-time kinetic energy, the friction energy consumption, and the mill's total work. Meanwhile, a method of balanced adjacent degree and a physical experiment were proposed to verify the considerable effect of the balls' kinetic energy on coal loads. The model and experiment results indicate that a coal load control method based on the balls' kinetic energy is therefore feasible for the optimized operation of a coal pulverizing system.

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Segregation patterns and characteristics differences of superfine pulverized coal ground by three pulverizing systems

Liu

Jiang

et al. 2019

Advanced Powder Technology

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Exploring ball size distribution in coal grinding mills

Cited by 34 publications

References 10 publications

Ball size distribution for the maximum production of a narrowly-sized mill product

Ball size distribution for the maximum production of a narrowly-sized mill product

Modeling on the Effect of Coal Loads on Kinetic Energy of Balls for Ball Mills

Segregation patterns and characteristics differences of superfine pulverized coal ground by three pulverizing systems

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