On the limitation of using the JKRBT in investigating incremental breakage

Cunha, Emerson Reikdal da; Cavalcanti, Pedro P.; Saeidi, Fatemeh; Tavares, Luís Marcelo

doi:10.1016/j.mineng.2018.01.007

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…e equivalent size distribution is calculated as shown in Figure 3. [3,16,25,26,27]. However, some energy could be transmitted into the base of the tester when the hammer impacts the particle, and the rebounding or downthrusting of the hammer can consume some energy as well, so the virtual energy used for particle breakage is less than the impact energy.…”

Section: Size Parametermentioning

confidence: 99%

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

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Particle shape and size are main factors influencing particle breakage. Single-particle breakage tests were conducted on irregular magnetite ore using modified drop weight impact equipment to analyze the effect of shape and size on specific breakage energy. A method to measure the effective breakage energy is presented. Ore particles with different sphericities and different sizes were broken into several fragments with differing impact energies in the tests. Experimental studies indicate that the shape of particles significantly influences the impact loading mode and breakage progress; the specific breakage energy has an obvious relationship with the sphericity and the initial size. The specific breakage energy decreases with larger initial loading area. The particle needs less specific breakage energy if the shape or placement state is more conducive to tensile fracture. There is an increase in specific breakage energy corresponding to an increase in particle sphericity with fixed initial size range. With the increase in the initial size of the particle, the specific breakage energy decreases with fixed sphericity range, which presents a power function with the exponent −0.5. The comprehensive relationship between specific breakage energy, particle sphericity, and initial size was established, showing that the input power of the crushing machinery and the optimization of crushing technology should be performed with consideration of the influence of particle shape and initial size to reduce specific energy consumption and improve energy efficiency.

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Section: Size Parametermentioning

confidence: 99%

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

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“…Particles on the guide plate accelerate to the outer edge of the rotor under the effect of centrifugal force, are thrown out at high speed at the end of the guide plate, and finally crush with the anvil by impact collision. − As can be seen, the particle’s unidirectional impact is primarily responsible for crushing the particles in the crusher. As a result, the crushing distribution characteristics of particles in a vertical shaft impact crusher cannot be precisely analyzed, as the crushing principles of the falling weight impact test and the pendulum impact test on particles are inconsistent with those of the vertical shaft impact crusher . As a result, designing a kind of testing machine to make the particle rotationally accelerated and then unidirectionally impacted and crushed, in conjunction with the crushing principle of a vertical shaft impact crusher, is of critical reference importance for the investigation of the crushing mechanism of vertical shaft impact crushers.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the crushing distribution characteristics of particles in a vertical shaft impact crusher cannot be precisely analyzed, as the crushing principles of the falling weight impact test and the pendulum impact test on particles are inconsistent with those of the vertical shaft impact crusher. 12 As a result, designing a kind of testing machine to make the particle rotationally accelerated and then unidirectionally impacted and crushed, in conjunction with the crushing principle of a vertical shaft impact crusher, is of critical reference importance for the investigation of the crushing mechanism of vertical shaft impact crushers.…”

Section: Introductionmentioning

confidence: 99%

The Crushing Distribution Morphology of a Single Particle Subjected to Rotary Impact

Wu,

Zhao,

Cao

2024

ACS Omega

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In a vertical shaft impact crusher, the particle crushing process is extraordinarily complex, and the particle shape significantly influences the size distribution of the crushed product. To quantify the crushing behavior of particles more accurately and thus reveal the crushing mechanism of the crusher, an analytical approach is suggested for characterizing the crushing distribution of particles subjected to rotational impact. First, according to the working principle of vertical shaft impact crusher, a rotary impact tester was designed, and the cumulative damage model of particles under repetitive impact was established based on the theory of fracture mechanics, based on which the simulation model of single-particle rotary impact tester was constructed. Then, seven distinct particle shapes were established based on the particle shapes observed during the crusher's actual production. Finally, an investigation was conducted using the simulation model to examine the impact of various rotor velocities and particle shapes on the macroscopic mechanical properties and crushing distribution attributes of single-particle crushing. In the single-particle rotary impact crushing experiments, the findings indicated that the particle crushing transpired at the site of contact with the anvil. The particle size distribution of subparticles generated through the crushing with distinct particle shapes all exhibit single-peak characteristics as rotor speed increases. The magnitude of the peak value progressively escalates in tandem with the rotor speed increase. Furthermore, as the rotor speed increases, so do the cumulative mass distribution and the maximum continuous crushing cumulative mass. When the horizontal aspect ratio of the particles is V < 1 and V > 1, the crushing effect of the particles is poor at the same rotational speed; the curve of the maximum continuous crushing degree has an inverted "V″ shape. The crushing effect of the particles improves as their edges become progressively sharper, and the maximum continuous crushing degree of the particles increases as the edge sharpness of the particles advances.

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“…More recent work investigated the amenability of JKRBT in generating additional (multiple) impact breakage of particle through rebounding and ricocheting of unbroken particles against the rotor using experimental and DEM simulation procedures. Testing of iron ore pellets in this investigation showed that the iron ore pellets broke more than expected when the results were compared to that of drop test (Da Cunha et al, 2018).…”

Section: The Jkrbtmentioning

confidence: 64%

“…As mentioned earlier in the literature review chapter, impact breakage involving particle propelling against an anvil produces progenies which tend to rebound against the moving rotor propelling the particle. This was observed both in the RBT impact breakage device (Da Cunha, et al, 2018) and the VSI . The effect of this action is coarse particles turn to attain energy and cause further breakage .…”

Section: Prediction Of Secondary Stage Impact Breakage Using Jksimmetmentioning

confidence: 67%

Investigation into multi-stage impact breakage

Agbenuvor¹

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Comminution circuits are responsible for the reduction of particles' size into size fractions suitable for downstream metal extraction processes. These circuits are energy inefficient and in most cases optimised on plant throughput. The inefficiency of these devices has been brought into the spotlight due to the progressive decline of ore feed grade, making the use of low-grade ores difficult to economically process. The global downturn in mine productivity has been the aftermath of pushing huge tonnages of low-grade ores to meet plants' production targets. The conditions leading to declining profitability of mines have propelled the need for a step-change in comminution technology and strategies. Grade Engineering TM has been identified as one of the ways to overcome and reverse the downward trend of mine productivity. It utilises ore specific breakage characteristics to effect coarse gangue Therefore, by Him, let us continually offer the sacrifice of praise to God, that is, the fruit of our lips, giving thanks to His name (Heb. 13:15). Praise and thanks go to the almighty God for bringing me this far in my academic endeavours and giving me strength, protection, good health, wisdom, knowledge and above all understanding during this research study. I couldn't have done it without His favours and graces He showered on me. I acknowledge and appreciate CRCORE's funding and support of this study. Further thanks to the enrolling unit, JKMRC, for its support of my MPhil candidature. My wholehearted appreciation goes to my advisors, Dr. Vladimir Jokovic and Dr. Christian Antonio, for their support, guidance, contribution and innovative ideas they shared with me for the success of this research work. Grateful for the technical advice, assistance in the analysis of data and meeting the critical deadlines of my project delivery. They have always been available for regular meetings and frequent discussions about the direction of my thesis and supported me during this long journey. I was privileged for their supervision. Special thanks to my associate advisor Dr. Rob Morrison, for his general insightful comments, guidance and valuable suggestions of the structure and direction of the thesis. Appreciation to my project colleagues, Raoni Lage and Alfred Septian for the numerous discussion on the project and experimental work conducted together. To the JKMRC Pilot Plant Staff for their diverse support, particularly Michael Kilmartin, for fabricating the prototype JKRBT and providing many other support services during the experimental work. My heartfelt appreciation goes to my dear partner Amanda Esenam for the invaluable understanding enduring this long distance and support especially during the times when everything seemed impossible. To my little one who was born just before attaining my admission and was mostly absent during your early stage of growth, special gratitude to you. My final appreciation goes to my parents Mr. and Mrs. Agbenuvor and siblings, for allowing me to realise my potential and also for the encouragement ...

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On the limitation of using the JKRBT in investigating incremental breakage

Cited by 5 publications

References 12 publications

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

The Crushing Distribution Morphology of a Single Particle Subjected to Rotary Impact

Investigation into multi-stage impact breakage

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