Effect of slurry pool formation on the load orientation, power draw, and impact force in tumbling mills

Soleymani, Moslem Mohammadi; Fooladi, M.; Rezaeizadeh, Masoud

doi:10.1016/j.powtec.2015.10.009

Cited by 14 publications

(9 citation statements)

References 21 publications

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“…As the analysis shows, deviations of values x2c from x2 at a nominal mass of the ball is insignificant and depends on the value of the broken ore volume. The values x2c are less then x2 with the nominal ball mass and change accordingly -0.51% (with Vp=1.25 cm 3 ); 0.32% (Vp=1.0 cm 3 ); 0.20% (Vp=0.75 cm 3 ); 0.14% (Vp=0.5 cm 3 ); 0.11% (Vp=0.25 cm 3 ).…”

Section: Methodsmentioning

confidence: 94%

“…2 for each value of Vp completely characterize the array of measurements, also considering the intermediate values of the balls mass, since the average value, which corresponding to the nominal one is stable. That is, if all the balls with a variable mass, which are contained in the normal crosssection of the drum, a constant volume of broken ore, for example, Vp=1.25 cm 3 , then the mean deformation value x2c, determined by the measured x2, completely characterizes the volume of the broken material Vp=1.25 cm 3 . In a simplified mathematical model, x2c was determined by three values -two limit and one average.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, [3] showed that there is a definite relationship between power consumption and filling of a ball mill drum with pulp. However, it is still difficult to use such a relationship.…”

Section: Actuality Of the Papermentioning

confidence: 99%

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The Study of Ore Breakage in Ball Mill to Assess the Energy Efficiency of Its Grinding

Кондратец¹,

Matsui²,

Artiukhov³

2021

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The results of mathematical modelling of ore breakage by a ball mill based on mathematical models of loaded and unloaded elastic elements are presented. The property of the arrangement of balls in the drum due to segregation is used, under the influence of which they are distributed with increasing size from the loading to the unloading throat, and in the cross-sections from the lining to the axis. It is shown that it is advisable to use the balls in the cross-section of the drum, where their size is 50 mm. The more the volume of ore is destroyed, the more the ball's energy is spent on this, the less energy will be converted into deformation of the elastic element. Consequently, the value of the deformation of the elastic element corresponds to the volume of the destroyed ore, as well as the energy efficiency of its grinding. The approach of interaction of balls with an elastic element from the point of view of mass phenomena will be more effective. The average value of deformations by all balls that have passed through the elastic element, arbitrarily accurately characterizes the average value of the destroyed volume of ore, that is, the energy efficiency of its grinding. The controlled parameter is found in accordance with the proposed relationship with the measured average deformation value of the elastic element. The deviation of certain values from the reference values is within 1%, which meets the requirements of the technological process.

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Section: Methodsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

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The Study of Ore Breakage in Ball Mill to Assess the Energy Efficiency of Its Grinding

Кондратец¹,

Matsui²,

Artiukhov³

2021

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“…The rational value of slurry content at the moment of reaching the maximum intensity of fill circulation and optimal conditions of realization of the process of wet grinding of copper ore (80-125 %) was revealed. The influence of material content on dynamic action of fill during wet grinding of copper ore was studied in [23]. The slurry filling varied within 0-250 %.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Establishing the effect of decreased power intensity of self-oscillatory grinding in a tumbling mill when the crushed material content in the intra-chamber fill is reduced

Deineka

Naumenko

2020

EEJET

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The influence of the content of crushed material in the intra-chamber grinding fill on the efficiency of the self-oscillatory grinding process in the tumbling mill was assessed. A dynamic effect of a significant decrease in self-oscillatory action of the two-fraction fill of the rotary chamber with an increase in the content of fine fraction was revealed by the method of visual analysis of motion patterns. A decrease in values of the following inertial fill parameters was established: maximum dilatancy υ max , the relative amplitude of self-oscillations ψ Rυ and a maximum share of the active part κ fam max with an increase in the degree of filling the gaps between particles of the coarse fraction κ mbgr. A decrease in the generalized complex degree of dynamic activation K a was also established. The effect is due to the strengthening of the cohesive properties of the incoherent coarse fraction under the influence of the fine fraction. There was a decrease in by 29 % for υ max, by 7 % for ψ Rυ , 2.9 times for κ fam max and 4.2 times for K a with an increase in κ mbgr from 0 to 1 at the degree of filling the chamber with the fill κ br = 0.45. Technological effect of a significant decrease in specific energy intensity and an increase in productivity of the innovative self-oscillatory grinding process in comparison with characteristics of the conventional steady-state process at a decrease in the content of crushed material in the fill was established. A process of milling cement clinker with grinding bo dies at relative size of 0.026 and κ br = 0.45 was considered. A decrease in specific energy intensity by 27 % at κ mbgr = 1, by 38 % at κ mbgr = 0.5625 and by 44 % at κ mbgr = 0 was found. An increase in relative productivity by 7 % at κ mbgr = 1, by 26 % at κ mbgr = 0.5625 and by 39 % at κ mbgr = 0.125 was established. The established effects will make it possible to forecast rational parameters of the self-oscillatory grinding process in a tumbling mill at the variation of the content of the crushed material in the fill Keywords: tumbling mill, content of crushed material in intra-chamber fill, self-oscillations, energy intensity of grinding

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“…Furthermore, the formed slurry pool in the mill has profound effect on the absorption of the balls energy [22,23]. In other words, with the formation of slurry pool, the energy due to the impact loads is lowered and the contribution of impact to the grinding is reduced.…”

Section: -3 the Slurry Filling Effectsmentioning

confidence: 99%

Experimental Study of Operational Parameters on Product Size Distribution of Tumbling Mill

Soleymani

2020

Preprint

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To assess the effects of the mill operating parameters such as mill speed, ball filling, slurry concentration and slurry filling on grinding process and size distribution of mill product, it was endeavored to build a pilot model with smaller size than the mill. For this aim, a pilot mill with 1m × 0.5m was implemented. There are 15 lifters with 50mm height and face angle of 30˚. In the present work, the combination of the balls (40% of the balls with 60mm diameter, 40% of the balls with 40mm diameter and 20% of the balls with 25mm diameter) was used as grinding media with 10%, 15%, 20% and 25% of the total volume of the mill. The experiments were carried out at 60%, 70%, 80% and 90% of the critical speed. The feed of the mill is copper ore with the size smaller than 25.4 mm, which d80 and d50 of them are 12.7 and 8 mm, respectively and slurries with 40%, 50%, 60%, 70% and 80% of solid and the slurry filling between 0.5 and 2.5. The results showed that the best grinding and grading occurs at 70-80% of the critical speed and ball filling of 20-25%. Optimized grinding was observed when the slurry volume is 1-1.5 times of the ball bed voidage volume and the slurry concentration is between 60% and 70%. The mill grinding mechanism in this work is a combination of both impact and abrasion mechanisms.

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Effect of slurry pool formation on the load orientation, power draw, and impact force in tumbling mills

Cited by 14 publications

References 21 publications

The Study of Ore Breakage in Ball Mill to Assess the Energy Efficiency of Its Grinding

The Study of Ore Breakage in Ball Mill to Assess the Energy Efficiency of Its Grinding

Establishing the effect of decreased power intensity of self-oscillatory grinding in a tumbling mill when the crushed material content in the intra-chamber fill is reduced

Experimental Study of Operational Parameters on Product Size Distribution of Tumbling Mill

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