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Dynamic Process Models for Fine Grinding and Dispersing

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Dynamic Flowsheet Simulation of Solids Processes

Abstract

Fine grinding and dispersing, such as grinding in stirred media mills, gains importance in several industrial processes. Solid materials processing is frequently subjected to dynamic changes, effecting the performance of milling. To accurately model milling processes, dynamic flowsheet simulation turns out as a promising approach to gain quick and reliable solutions, describing the milling process over time. The connection of different process units is even closer to the industrial setup. Therefore, the focus of the study is the introduction of a dynamic model for stirred media mills that can be implemented into flowsheet simulation. The modelling approach aims at separating grinding and transport phenomena in the mill. Starting with an investigation of a batch grinding process in a “calibration mill”, the dependency of the breakage rate on machine and material parameters is shown. The stressing conditions in this calibration mill are determined theoretically and via simulations using coupled CFD-DEM simulations. In the study, the prediction of influences such as varying grinding media, stirrer speed and solids concentration on the breakage rate worked out well. In continuous processes, the particle transport and axial grinding media distribution, effecting the dynamics, are simulated as a series of instantly mixed cells, connected by mixing streams. With the dynamic flowsheet simulator Dyssol, the dynamic response of the product to changes in the feed was compared to experimental investigations with limestone in a laboratory stirred media mill. Material parameters for the model were tested in a newly designed breakage tester.

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Authors and Affiliations

  1. Institute of Particle Technology, Technische Universität Braunschweig, Brunswick, Germany

    Greta Fragnière, Ann-Christin Böttcher, Christoph Thon, Carsten Schilde & Arno Kwade

Authors
  1. Greta Fragnière
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  2. Ann-Christin Böttcher
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  3. Christoph Thon
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  4. Carsten Schilde
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  5. Arno Kwade
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Corresponding authors

Correspondence to Carsten Schilde or Arno Kwade .

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Editors and Affiliations

  1. Institute of Solids Process Engineering and Particle Technology, Hamburg University of Technology, Hamburg, Germany

    Stefan Heinrich

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Fragnière, G., Böttcher, AC., Thon, C., Schilde, C., Kwade, A. (2020). Dynamic Process Models for Fine Grinding and Dispersing. In: Heinrich, S. (eds) Dynamic Flowsheet Simulation of Solids Processes. Springer, Cham. https://doi.org/10.1007/978-3-030-45168-4_6

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