A comparative study on a newly designed ball mill and the conventional ball mill performance with respect to the particle size distribution and recirculating load at the discharge end

Hanumanthappa, Harish; Vardhan, Harsha; Mandela, Govinda Raj; Kaza, Marutiram; Sah, Rameshwar; Shanmugam, Bharath Kumar

doi:10.1016/j.mineng.2019.106091

Cited by 24 publications

(6 citation statements)

References 22 publications

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“…The results reported in this work regarding the rational range of rotation speed ψ ω = 0.55-0.65 coincide well with the data from [2,36,37], as well as with GOST 10141-91 and its analogs [38,39]. In those sources, the processes of medium grinding in tumbling mills were considered, mainly by compression during the compressive interaction of loading elements.…”

Section: Discussion Of Results Of Investigating the Grinding Process ...supporting

confidence: 86%

“…In work [36], the rotation speed ψ ω = 0.5-0.6 was experimentally determined to be rational for reducing the energy consumption of the process of wet grinding of limestone. In [37] it was experimentally shown that the highest productivity of wet grinding of iron ore in a laboratory ball mill is achieved at ψ ω = 0.6. Technical standard GOST 10141-91 «Rod and ball mills.…”

Section: Discussion Of Results Of Investigating the Grinding Process ...mentioning

confidence: 99%

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Building a model of the compression grinding mechanism in a tumbling mill based on data visualization

Naumenko,

Deineka

2023

EEJET

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The object of the study reported here is the grinding process in a tumbling mill where the mechanism of destruction by crushing is implemented, which is caused by the mechanism of compression loading. The compressive interaction in the active zone of the lower end of the granular loading chamber of the rotating drum at the transition of the shear layer to the solid zone was taken into account. The task to determine the parameters of the compressive action was solved, which was caused by the difficulties of modeling and the complexity of the hardware analysis of the behavior of the internal loading of the mill. A mathematical model was built based on data visualization for the compression grinding mechanism. The power of compressive forces was taken as an analog of grinding performance. The initial characteristic of compression was considered to be the mean speed of movement in the central averaged normal cross-section of the shear layer. The influence on the performance of the mass fraction of the shear layer and the reversibility of loading was taken into account. The effect of rotation speed on productivity was evaluated by experimental modeling at a chamber filling degree of 0.45 and a relative size of grinding bodies of 0.0104. The maximum value of energy and grinding productivity was established at a relative speed of rotation ψω=0.6–0.65. The maximum value of the share of the shear layer loading was found at ψω=0.4–0.45. The results have made it possible to establish a rational speed during crushing by compression, ψω=0.55–0.65. This value was smaller in comparison with impact crushing, ψω=0.75–0.9. The observed effect is explained by the detected activation for the shear loading layer during slow rotation, in contrast to the fast rotation for the drop zone. The model built makes it possible to predict rational technological parameters of the process of medium and fine grinding in a tumbling mill by compression.

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Section: Discussion Of Results Of Investigating the Grinding Process ...supporting

confidence: 86%

Section: Discussion Of Results Of Investigating the Grinding Process ...mentioning

confidence: 99%

Building a model of the compression grinding mechanism in a tumbling mill based on data visualization

Naumenko,

Deineka

2023

EEJET

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“…The established recommendations for the rational range of rotation speed during abrasion grinding ψ ω = 0.5-0.6 coincide well with the data from [1,57,58] and GOST 10141-91 and its analogs [59,60]. In these sources, the processes of medium grinding in tumbling mills were considered mainly by attrition during the shear interaction of loading.…”

Section: Discussion Of Results Of Investigating the Grinding Process ...supporting

confidence: 71%

“…In work [57], the speed of rotation ψ ω = 0.5-0.6 was experimentally established when reducing the energy intensity of the process of wet grinding of limestone. In [58], a speed of ψ ω = 0.6 was experimentally found for the highest productivity of wet grinding of iron ore in a laboratory ball mill. Standards GOST 10141-91 «Rod and ball mills.…”

Section: Discussion Of Results Of Investigating the Grinding Process ...mentioning

confidence: 98%

Building a model of the abrasion grinding mechanism in a tumbling mill based on data visualization

Naumenko,

Deineka,

Zabchyk

2024

EEJET

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The object of this study is the grinding process in a tumbling mill when the mechanism of destruction by abrasion is implemented, which is caused by the mechanism of shear loading. The abrasive effect due to the impulse interaction during the mutual chaotic movement of granular particles in the shear layer of loading, characterized by the granular temperature, is taken into account. The task solved was determining the parameters of the shear interaction, which is caused by the difficulties of modeling and complexity of the hardware analysis of behavior of the internal loading in the mill. A mathematical model was built based on data visualization for the abrasion grinding mechanism. The power of the shear interaction forces was taken as an analog of the grinding performance. The initial shear characteristic was considered to be the average value of the shear velocity gradient in the central averaged normal section of the shear layer. The impact on productivity of the granular temperature and mass fraction of the shear layer and loading turnover was taken into account. The effect of rotation speed on performance was evaluated by experimental modeling at a chamber filling degree of 0.45 and a relative particle size of 0.0104. The maximum value of the energy and productivity of grinding by abrasion was established at the relative speed of rotation ψω=0.55–0.6. The results have made it possible to establish a rational speed when grinding by abrasion, ψω=0.5–0.6. This value is smaller in comparison with grinding by crushing ψω=0.55–0.65 and breaking ψω=0.75–0.9. The established effect is explained by the detected activation of the chaotic quasi-thermodynamic movement of particles of the shear layer at slow rotation. The model built makes it possible to predict rational technological parameters of the energy-saving process of fine grinding in a tumbling mill by abrasion

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“…The grinding method is one of the promising methods to enhance the catalytic activity of the natural CaO. Dry grinding using liquid additive was satisfactorily effective to increase the grinding efficiency since it helps the ability of the particle to flow accordingly during the grinding process [11][12][13][14]. The effect of the grinding aid in this case liquid additive is to shorten the grinding process so that the energy might be decreased [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Highly Active Calcium Oxide Derived from Scallop Shell for Used Cooking Oil Transesterification Reaction

Simanullang¹,

Yamanaka²

2022

IJDNE

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The liquid additive grinding method was used to improve the specific surface area (SSA) of calcium oxide (CaO) derived from scallop shells as a sustainable resource. Grinding was carried out using a planetary ball mill on a laboratory scale by stepwise addition of some polar and non-polar solvents to determine CaO grinding limit. The crystalline phase of CaO was determined by using X-ray Diffraction (XRD) and SSA was observed based on Brunauer, Emmet, and Teller (BET) method. The mechanism of grinding was obtained from the Scanning Electron Microscope (SEM). The SSA of CaO was increased in proportion to the amount of the liquid additive and grinding time up to 102 m2 g-1 while the CaO phase was retained even after the addition of liquid according to the spectra of Fourier Transform-Infrared (FT-IR). The high conversion of triglyceride from used cooking oil to fatty acid methyl esters (FAMEs) up to 99% was obtained within an hour at 65℃.

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A comparative study on a newly designed ball mill and the conventional ball mill performance with respect to the particle size distribution and recirculating load at the discharge end

Cited by 24 publications

References 22 publications

Building a model of the compression grinding mechanism in a tumbling mill based on data visualization

Building a model of the compression grinding mechanism in a tumbling mill based on data visualization

Building a model of the abrasion grinding mechanism in a tumbling mill based on data visualization

Highly Active Calcium Oxide Derived from Scallop Shell for Used Cooking Oil Transesterification Reaction

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