Modeling and simulation of green iron ore pellet classification in a single deck roller screen using the discrete element method

Silva, Benito Barbabela e; Cunha, Emerson Reikdal da; Carvalho, Rodrigo M. de; Tavares, Luís Marcelo

doi:10.1016/j.powtec.2018.04.005

Cited by 40 publications

(29 citation statements)

References 21 publications

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“…The second model was originally proposed to allow for the simulation of Van der Waals forces [ 25 ], which influence the flow behaviour of fine and dry powders. However, it also allows representing the cohesive nature of both fine particles and wet materials, being capable of describing the influence of moisture content on the mass flow of larger-scale materials, such as iron ore or wet grains [ 26 , 27 ]. This model was used to simulate the mixing of the wet formulations, that is, AW and CW ( Table 2 ).…”

Section: Methodsmentioning

confidence: 99%

Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing

et al. 2021

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Concrete mixing can lead to mechanical degradation of aggregates, particularly when dealing with recycled concrete aggregates. In this work, the attrition of such materials during mixing is studied by means of experiments and simulations. The effect of the presence of fines, water addition, flow configuration of the mixer (co- or counter-current) and impeller frequency is discussed. Experiments were performed in a laboratory Eirich mixer. Discrete element numerical simulations (DEM) were performed on the same geometry by mimicking the behaviour of the material and, in particular, the cohesion induced by water and the cement paste using either Hertz–Mindlin or Hertz–Mindlin with Johnson–Kendall–Roberts (JKR) contact laws. The combination of the collision energy spectra extracted from the DEM simulations and an attrition model allowed the prediction of the mass loss due to attrition in 1-min experiments. Semi-quantitative agreement was observed between experiments and simulations, with a mean relative error of 26.4%. These showed that higher mass losses resulted from operation at the highest impeller speeds, co-current operation, and also with the wet aggregate. Mixing of the agglomerate in the concrete mix resulted in a significant reduction in attrition when compared to mixing aggregates alone. With further validation, the proposed simulation approach can become a valuable tool in the optimization of mixing by allowing the effects of material, machine and process variables to be studied on the mass loss due to attrition.

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Section: Methodsmentioning

confidence: 99%

Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing

et al. 2021

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“…Based on industrial information collected in a pelleting plant, such as mean discs feed rate, conveyor belts speed and width, number of rolls and gaps distribution, simulations (Figure 1) were performed on EDEM ® from DEM Solutions and licensed to Laboratório de Tecnologia Mineral of COPPE/UFRJ, using the JKR contact model. Details of the model parameters and simulation setup can be found elsewhere 10 .…”

Section: Methodsmentioning

confidence: 99%

Modelamento Da Classificação De Pelotas Verdes De Minério De Ferro Em Peneiras De Rolos Pelo Método Dos Elementos Discretos

Silva¹,

Carvalho²,

Cunha³

et al. 2017

Anais Dos Seminários De Redução, Minério De Ferro E Aglomeração

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O pelotamento é a mais complexa etapa de aglomeração de finos de minério de ferro. Sua resposta é naturalmente oscilante, sendo bastante influenciada pelas características físicas obtidas nos processos de beneficiamento mineral que a precedem e tem papel crucial para a etapa de tratamento térmico de sinterização à jusante. O presente trabalho aborda o processo de classificação de pelotas verdes, sólidos singulares de aspecto deformável e pegajoso, em peneiras de rolos por modelamento por aplicação de Método dos Elementos Discretos. Esta técnica mostra-se como uma importante ferramenta pois supera as limitações impostas na modelagem física (quantificação e identificação de fluxos por ausência de instrumentação em escala industrial, amostragem sem representatividade) ao reproduzir de forma verossímil as repostas do sistema para importantes variáveis de controle: comprimento de gap, umidade, dispersão de tamanhos e resistência das pelotas.

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“…The discrete element method is a numerical simulation analysis method solving the problem of interaction between discontinuous media (particulate materials) and between discontinuous media and boundary or external contact components [7,8] . Currently, it is widely applied in many fields such as geotechnics, medicine, food and agriculture [9][10][11] . In the field of agricultural engineering, discrete element software is mainly used in the study of the flow characteristics of particulate materials [12,13] , contact relations between a particulate material and external contact components, and dynamic response characteristics [14][15][16] .…”

Section: Introduction 1mentioning

confidence: 99%

Calibration of the simulation parameters of the particulate materials in film mixed materials

Liang

Chen

Jiang

et al. 2020

International Journal of Agricultural and Biological Engineering

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In order to obtain accurate contact parameters of a particulate material in residual film mixture collected by cotton field machine in Xinjiang, the angle of repose test and inclined plane test were carried out. In the tests, the angles of repose of the particulate material with the water content of (6.26±1.5)% and (14.1±2.1)% were measured respectively, as well as the static sliding friction angle between the particulate material and the residual film. At the same time, the EDEM software was used to calibrate the coefficient of restitution, static friction coefficient and dynamic friction coefficient between the material and the film. Then, the second-order response model between contact parameters and the angle of repose and static sliding friction angle was constructed. In addition, the optimal contact parameters between the granular materials and the mulch were obtained by fitting the physical test data. The results indicated that the errors between the physical test results and the numerical simulation results are small. It was proved that the second-order response model could predict the repose angle of granular materials and the static sliding friction angle between granular materials and farmland film. This study could provide theoretical support for the subsequent model construction of the residual film mixture collected by the cotton field machine.

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Modeling and simulation of green iron ore pellet classification in a single deck roller screen using the discrete element method

Cited by 40 publications

References 21 publications

Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing

Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing

Modelamento Da Classificação De Pelotas Verdes De Minério De Ferro Em Peneiras De Rolos Pelo Método Dos Elementos Discretos

Calibration of the simulation parameters of the particulate materials in film mixed materials

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