Dewatering of finely dispersed calcium carbonate-water slurries in decanter centrifuges: About modelling of a dynamic simulation tool

Menesklou, Philipp; Nirschl, Hermann; Gleiß, Marco

doi:10.1016/j.seppur.2020.117287

Cited by 18 publications

(39 citation statements)

References 18 publications

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“…The fit parameters are r 1 , r 2 , and r 3 , and are adapted to experimental data. Menesklou et al [13] show that this function is able to describe the experimentally determined settling behaviour. In Figure 3, the resulting hindered settling functions of the two used calcium carbonate products are plotted against the solids volume fraction.…”

Section: Numerical Model and Materials Characterisationmentioning

confidence: 99%

“…The properties of the individual compartments can change over time due to sediment build-up or a change in the process parameter and thus reflect the dynamic behaviour of the centrifuge. Further information about the modelling, such as discretisation, numerical algorithms, and governing equations, are explained and discussed in detail in Menesklou et al [13].…”

Section: Numerical Model and Materials Characterisationmentioning

confidence: 99%

“…If K o = 0 and K p = 1, Equation ( 12) decreases to uniaxial compression. A detailed description of the measuring procedure can be found in Menesklou et al [13]. Hammerich et al [26] present an overview of a modified ring shear cell to measure the yield point of liquid-saturated, compressible sediments.…”

Section: Numerical Model and Materials Characterisationmentioning

confidence: 99%

“…This conical part of the decanter centrifuge, through which the sediment is transported out of the pool to the cake discharge, plays indeed a decisive role in the dewatering and transport of the sediment. Therefore, Menesklou et al [13] extended the numerical model of Gleiss et al [12] by integrating the conical part of the decanter centrifuge in the model. The work of Menesklou et al [13] has focused on modelling the conical part, and the results presented in this work are promising but demand further investigations regarding scale-up capability and transferability.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, Menesklou et al [13] extended the numerical model of Gleiss et al [12] by integrating the conical part of the decanter centrifuge in the model. The work of Menesklou et al [13] has focused on modelling the conical part, and the results presented in this work are promising but demand further investigations regarding scale-up capability and transferability. So far, the extended material characterisation and validation of this comprehensive approach have only been performed for one finely dispersed mineral product and for one scale.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Scale-Up of Decanter Centrifuges for the Particle Separation and Mechanical Dewatering in the Minerals Processing Industry by Means of a Numerical Process Model

et al. 2021

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Decanter centrifuges are frequently used for thickening, dewatering, classification, or degritting in the mining industry and various other sectors. Their use in an industrial process chain requires a sufficiently accurate prediction of the product and the machine behaviour. For this purpose, experiments on a smaller pilot-scale are carried out for scale-up of a decanter centrifuge, which is usually a major challenge. Predicting the process behaviour of decanter centrifuges from laboratory tests is rather difficult. Basically, there are two common ways of scale-up: First, via analytical methods and the law of similarity, which often requires an enormous experimental effort. Second, using numerical models, which demands a mathematically and physically precise description of the multiple processes running simultaneously in such machines. This article provides an overview of both methods for scale-up of a decanter centrifuge. The concept of a previous developed numerical approach is introduced. Pros and cons of both scale-up methods are compared and further discussed. Experiments on lab-scale, pilot-scale, and industrial-scale decanter centrifuges with two different finely dispersed calcium carbonate water suspensions were carried out and simulations were done to investigate and prove the scale-up capability and transferability of the numerical approach.

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Section: Numerical Model and Materials Characterisationmentioning

confidence: 99%

Section: Numerical Model and Materials Characterisationmentioning

confidence: 99%

Section: Numerical Model and Materials Characterisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Scale-Up of Decanter Centrifuges for the Particle Separation and Mechanical Dewatering in the Minerals Processing Industry by Means of a Numerical Process Model

et al. 2021

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Enhancing decanter centrifuge process design with data‐driven material parameters in multi‐compartment modeling

Zhai,

Ehret,

Rhein

et al. 2024

J Adv Manuf & Process

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Predicting the separation performance of decanter centrifuges is challenging due to dynamic events within the apparatus. Current methods for designing decanter centrifuges rely on simplified models, often leading to inaccuracies. Consequently, manufacturers must perform time‐intensive pilot scale experiments to derive their own correction factors. Growing computing power sparks interest in alternative modeling strategies. Grey box models (GBM) combine mechanistic white box models (WBM) and data‐driven black box models (BBM), with the optimal structure (parallel or serial) varying by application. For modeling decanter centrifuges, we propose a serial GBM that comprises an artificial neural network that outputs unknown material parameters into a first‐principle multi‐compartment model. Comparing this approach to alternative data‐driven modeling strategies (pure BBM, parallel GBM), we conclude that the serial GBM excels in terms of extrapolation, prediction ability, and transparency while also enabling a better comprehension of the separation process.

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Study on the structure of energy‐saving bend pipes in a decanter centrifuge

Fu,

Li,

Zhou

et al. 2023

Asia-Pacific J Chem Eng

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Decanter centrifuges are widely used in solid–liquid separation, and saving their energy consumption is very important. In this paper, a bend pipe installed at the end of the decanter centrifuge was designed to save energy, and the effect of different structural parameters of the energy‐saving bend pipes on the outlet velocity and the reaction torque was investigated. The results revealed that the outlet velocity and the reaction torque were reduced with the increase in the number of pipes, outlet area, and pipe length. Increasing the radial position had little effect on the outlet velocity, but increased the reaction torque. Decreasing the outlet area and increasing the radial position both weaken the separation performance of the decanter centrifuge. The best separation performance and reaction torque effect were achieved in a suitable structure. Furthermore, the turbulent intensity was reduced from 143% to 135% in the new machine installed with bend pipes. The energy‐saving efficiency dropped with the increase of the rotational speed and the value was 13.1% under 2500 rpm. The separation performance of the new machine was similar to that of the original machine, and the dewatering speed was increased with the increase of the axial position.

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Dewatering of finely dispersed calcium carbonate-water slurries in decanter centrifuges: About modelling of a dynamic simulation tool

Cited by 18 publications

References 18 publications

Scale-Up of Decanter Centrifuges for the Particle Separation and Mechanical Dewatering in the Minerals Processing Industry by Means of a Numerical Process Model

Scale-Up of Decanter Centrifuges for the Particle Separation and Mechanical Dewatering in the Minerals Processing Industry by Means of a Numerical Process Model

Enhancing decanter centrifuge process design with data‐driven material parameters in multi‐compartment modeling

Study on the structure of energy‐saving bend pipes in a decanter centrifuge

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