Pressing iron ore concentrate in a pilot-scale HPGR. Part 2: Modeling and simulation

Campos, Túlio Moreira; Bueno, Gilvandro; Barrios, Gabriel K.P.; Tavares, Luís Marcelo

doi:10.1016/j.mineng.2019.105876

Cited by 14 publications

(12 citation statements)

References 20 publications

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“…The model consists of linking outputs from DEM simulations to the population balance model (PBM). This later is represented by the energy-specific selection function proposed by Herbst and Fuerstenau (1980), a nonnormalizable breakage distribution function used by Campos et al (2019a) and selected expressions proposed by Torres and Casali (2009). Following this approach, DEM simulations allow to capture the effect of design and operating variables on the HPGR performance, while the PBM model allows dealing with the entire range of particle sizes fed to the machine.…”

Section: Proposed Hybrid Modelmentioning

confidence: 99%

“…Two functions must be known in order to solve the resulting system of differential equations: b ij and S i,k . Campos et al (2019a) and Faria et al (2019) observed that, for some Brazilian iron ores, the non-normalizable breakage function proposed by King (2001) was required to describe their response, being given by:   1 for…”

Section: Proposed Hybrid Modelmentioning

confidence: 99%

“…In the present study, the Modified Torres and Casali (MTC) model (Campos et al, 2019a) represents the purely phenomenological model that is compared to the proposed hybrid approach. A summary of its main expressions and the comparison with the corresponding ones in the hybrid model is presented in Table 1.…”

Section: Modified Torres and Casali Modelmentioning

confidence: 99%

“…As such, good predictions of product fineness rely on the ability of the model to properly predict HPGR throughput and power. Based on a large number of experiments, Campos et al (2019a) identified some limitations of the Torres and Casali approach when applied to a pilotscale HPGR processing iron ore pellet feed. The authors proposed modifications of the expressions originally used to describe HPGR throughput, associated to the material ejection from the edge of the rolls, as well as to the power consumption equation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Hybrid PBM-DEM Model of High-Pressure Grinding Rolls Applied to Iron Ore Pellet Feed Pressing

Rodriguez

Campos

Barrios

et al. 2023

KONA

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Mathematical models of high-pressure grinding rolls (HPGR) have attracted great attention, owing to their role in optimization of operating machines as well as in the design and selection of new ones. Although population balance models (PBM) and the discrete element method (DEM) have been used in this task, both suffer from important limitations. Whereas PBMs have challenges associated to the prediction of operating gap and to the validity of several of its assumptions in different formulations in the literature, application of DEM has its own challenges, in particular when fed with distributions containing large amounts of fines. This work proposes a hybrid approach in which the coupling of DEM to particle replacement models and multibody dynamics is used to predict operating gap, throughput and power, as well as providing information along the rolls length that is used in PBM to predict the product fineness. The hybrid approach is then compared to both DEM and a PBM (Modified Torres and Casali), demonstrating similar results to the later when applied to simulating a pilot-scale machine operating under different conditions, but improved prediction when applied in scale-up to an industrial-scale HPGR.

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Section: Proposed Hybrid Modelmentioning

confidence: 99%

Section: Proposed Hybrid Modelmentioning

confidence: 99%

Section: Modified Torres and Casali Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Hybrid PBM-DEM Model of High-Pressure Grinding Rolls Applied to Iron Ore Pellet Feed Pressing

Rodriguez

Campos

Barrios

et al. 2023

KONA

Self Cite

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“…The scaling-up procedure was performed based on a particular mechanical property of the HPGR (the ratio of the roll gap to the diameter), which was assumed to remain constant at any operating scale. Similarly, Campos et al [32] also cast the calibration problem as a least squares optimization problem. The objective function was designed to consider the logarithms of the measured and estimated values of the cumulative PSD, and the resulting problem was solved using a direct search algorithm from fminsearch in MathWorks MATLAB ® .…”

Section: Literature Reviewmentioning

confidence: 99%

Calibration and Validation of a Cone Crusher Model with Industrial Data

et al. 2021

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This paper reports the calibration and validation of a cone crusher model using industrial data. Usually, there are three calibration parameters in the condensed breakage function; by contrast, in this work, every entry of the lower triangular breakage function matrix is considered a calibration parameter. The calibration problem is cast as an optimization problem based on the least squares method. The results show that the calibrated model is able to fit the validation datasets closely, as seen from the low values of the objective function. Another significant advantage of the proposed approach is that the model can be calibrated on data that are usually available from industrial operation; no additional laboratory tests are required. Calibration and validation tests on datasets collected from two different mines show that the calibrated model is a strong candidate for use in various dynamic simulation applications, such as control system design, equipment sizing, operator training, and optimization of crushing circuits.

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An off-line state observer of the slip, shear stress, and pressure profiles in the high-pressure grinding rolls crusher working gap

Thivierge

Bouchard

Desbiens

2021

Advanced Powder Technology

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Pressing iron ore concentrate in a pilot-scale HPGR. Part 2: Modeling and simulation

Cited by 14 publications

References 20 publications

A Hybrid PBM-DEM Model of High-Pressure Grinding Rolls Applied to Iron Ore Pellet Feed Pressing

A Hybrid PBM-DEM Model of High-Pressure Grinding Rolls Applied to Iron Ore Pellet Feed Pressing

Calibration and Validation of a Cone Crusher Model with Industrial Data

An off-line state observer of the slip, shear stress, and pressure profiles in the high-pressure grinding rolls crusher working gap

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