Abstract
For a broad range of applications sieving/screening is well suited to separate bulk materials according to particle sizes. In the treated bulk materials particles frequently prevail in broad size distributions, with non-spherical shape and sometimes even under moist conditions, complicating the separation process. Therefore, it is inevitable to gain a deeper understanding of the subprocesses of screening (size based stratification, particle passage through the screen surface and possible transport along the screen) under the aforementioned conditions. To gain this knowledge, detailed particle-based simulation approaches like the discrete element method (DEM) are available. Based on the latter method, discontinuous and continuous screening as well as its subprocesses are investigated. Therein, different screen geometries and characteristics are considered along with various mechanical excitations applying model and real particle shapes first under dry conditions and later under the influence of various liquid amounts. In order to perform reliable DEM screening simulations, the exact determination of particle properties like size, shape, material and contact parameters is essential, which is required in advance of the simulations. Besides the DEM, the integral outcome of screening can be represented by various phenomenological process models. Usually, the material-, operating-, and apparatus-specific parameters of the latter process models are empirically determined by experiments, whereas, here, the parameters for screening process models are directly obtained from DEM simulations, which allows their benchmarking under defined conditions. Additionally, suitable process models are successfully extended to represent screening processes under the presence of moisture.
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The authors gratefully acknowledge the support by DFG within project SPP 1679 through grant number KR3446/7-1, KR3446/7-2 and KR3446/7-3.
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Markauskas, D., Kruggel-Emden, H. (2020). Development of a Dynamic-Physical Process Model for Sieving. In: Heinrich, S. (eds) Dynamic Flowsheet Simulation of Solids Processes. Springer, Cham. https://doi.org/10.1007/978-3-030-45168-4_5
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