Research on the Influencing Factors and Prediction Model of Impact Airflow in the Process of Unloading of an Ore Pass Based on a Coupled Computational Fluid Dynamics and Discrete Element Method

Wang, Jiuzhu; Du, Cuiwei; Wang, Yapeng

doi:10.1021/acsomega.1c02424

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…Table 2 presents the particle and contact parameters of the limestone particles as well as the tester. 40 As shown in Table 3, the parameters of the crushing model for limestone particles were derived by fitting data from single particle impact crushing experiments. 41,42…”

Section: Setting Of Simulation Parametersmentioning

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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Section: Setting Of Simulation Parametersmentioning

confidence: 99%

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

Wu,

Zhao,

Cao

2024

ACS Omega

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“…The factors are divided into five levels, the level range of ore particle size: 0–10 mm, ore moisture: 1–3%, slip height: 50–150 cm, ore pass inclination: 70°–90°. The orthogonal experimental analysis method, which is the most commonly used multi-factor experimental analysis method 33 – 35 , was proposed in conducting compatibility tests due to only four factors, while the L 25 (5 6 ) standard orthogonal table can be arranged with up to six factors 36 . Consequently, the data in columns 5 and 6 need not be taken into account when designing test cases.…”

Section: Similar Simulation Experiments Of Mine Release From the Ore ...mentioning

confidence: 99%

Experimental study on the probabilities of kinked arches and kinked arch locations in ore passes under the influences of multiple factors

Ma,

Wei,

Zhang

2023

Sci Rep

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A smooth shaft production process is important to ensure the safe and efficient development of mineral resources. Due to the influence of ore rock and the mismatch between rock size and ore pass design, an arching phenomenon occurs frequently during actual ore pass release, stagnating production. Therefore, an ore pass release simulator with a freely variable ore pass angle and height is designed and used to conduct a four-factor, five-level orthogonal ore pass release experiment. An analysis is performed to determine the influence of four factors—ore particle size, ore moisture, ore pass inclination and slip height—on the probability of ore pass arching; from there, an ore pass arching probability equation is constructed and the characteristics of the ore pass arching location are clarified, effectively predicting the probability of ore pass arching and providing an effective basis for handling arching events within an applicable range. This analysis effectively predicts the probability of ore pass arch within the applicable range, and provides an effective basis for handling ore pass arch events.

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“…Zuo Miaomiao et al [ 8 ] analyzed the differences between the internal contact force of granular medium and the force chain, porosity, and coordination number in the particle medium after the action of the ultrasonic vibration. Wang Wentao et al [ 12 ] studied the effect of vibration on the dense packing of refractory powder and determined that the average porosity of powder first decreased and then increased with the increase in vibration time, and they pointed out that the compaction effect caused by longitudinal vibration was better than that caused by transverse vibration. Sedaghat et al [ 13 ] proposed a physics-based constitutive model to accurately describe the deformation behavior in the process of ultrasonic-vibration-assisted forming.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Microscopic Mechanism of Ultrasonic-Vibration-Assisted-Pressing of WC-Co Powder by Simulation

et al. 2023

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The ultrasonic-vibration-assisted pressing process can improve the fluidity and the uneven distribution of density and particle size of WC-Co powder. However, the microscopic mechanism of ultrasonic vibration on the powder remains unclear. In this paper, WC particles with diameter 5 μm and Co particles with diameter 1.2 μm were simulated by three-dimensional spherical models with the aid of the Python secondary development. At the same time, the forming process of the powder at the mesoscale is simulated by virtue of the finite element analysis software ABAQUS. In the simulation process, the vibration amplitude was set to 1, 2, and 3 μm. Their influence on the fluidity, the filling density, and the stress distribution of WC-Co powder when the ultrasonic vibration was applied to the conventional pressing process was investigated. The simulation results show that the ultrasonic vibration amplitude has a great influence on the density of the compact. With an increase in the ultrasonic amplitude, the compact density also increases gradually, and the residual stress in the billet decreases after the compaction. From the experimental results, the size distribution of the billet is more uniform, the elastic after-effect is reduced, the dimensional instability is improved, and the density curves obtained by experimentation and simulation are within a reasonable error range.

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Research on the Influencing Factors and Prediction Model of Impact Airflow in the Process of Unloading of an Ore Pass Based on a Coupled Computational Fluid Dynamics and Discrete Element Method

Cited by 6 publications

References 39 publications

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

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

Experimental study on the probabilities of kinked arches and kinked arch locations in ore passes under the influences of multiple factors

Investigating the Microscopic Mechanism of Ultrasonic-Vibration-Assisted-Pressing of WC-Co Powder by Simulation

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