Influence of nanomechanical crystal properties on the comminution process of particulate solids in spiral jet mills

The study of preferred crystallographic orientation (texture) in ceramics is assuming greater importance as their anisotropic crystal properties are being used to advantage in an increasing number of applications. The quantification of texture by a reliable and rapid method is required. Analysis of backscattered electron Kikuchi patterns (BEKPs) can be used to provide the crystallographic orientation of as many grains as time and resources allow. The technique is relatively slow, particularly for noncubic materials, but the data are more accurate than any comparable technique when a sufficient number of grains are analyzed. Thus, BEKP is well-suited as a verification method for data obtained in faster ways, such as x-ray or neutron diffraction. We have compared texture data obtained using BEKP, x-ray diffraction and neutron diffraction. Alumina specimens displaying differing levels of axisymmetric (0001) texture normal to the specimen surface were investigated.BEKP patterns were obtained from about a hundred grains selected at random in each specimen.

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Crystal Properties via Group Theory

10.1017/cbo9780511524318 ◽

1995 ◽

Cited By ~ 25

Author(s):

Arthur S. Nowick

Keyword(s):

Group Theory ◽

Crystal Properties

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TRANSPORT AND CRYSTAL PROPERTIES OF α– AND β – Ce3Al

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19888354 ◽

1988 ◽

Vol 49 (C8) ◽

pp. C8-783-C8-784 ◽

Cited By ~ 2

Author(s):

J. Sakurai ◽

T. Matsuura ◽

Y. Komura

Keyword(s):

Crystal Properties

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Microstructures in Elastic Media

10.1093/oso/9780195090864.001.0001 ◽

1994 ◽

Cited By ~ 1

Author(s):

Nhan Phan-Thien ◽

Sangtae Kim

Keyword(s):

Computational Methods ◽

High Performance ◽

Chemical Engineering ◽

Elliptic Partial Differential Equations ◽

Parallel Computers ◽

Computational Algorithms ◽

Applied Physics ◽

Advanced Students ◽

Particulate Solids ◽

Modeling Software

This monograph describes various methods for solving deformation problems of particulate solids, taking the reader from analytical to computational methods. The book is the first to present the topic of linear elasticity in mathematical terms that will be familiar to anyone with a grounding in fluid mechanics. It incorporates the latest advances in computational algorithms for elliptic partial differential equations, and provides the groundwork for simulations on high performance parallel computers. Numerous exercises complement the theoretical discussions, and a related set of self-documented programs is available to readers with Internet access. The work will be of interest to advanced students and practicing researchers in mechanical engineering, chemical engineering, applied physics, computational methods, and developers of numerical modeling software.

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Grain-based DEM for Particle Bed Comminution

Minerals ◽

10.3390/min11030306 ◽

2021 ◽

Vol 11 (3) ◽

pp. 306

Author(s):

Michael Klichowicz ◽

Holger Lieberwirth

Keyword(s):

Grain Size ◽

Discrete Element Method ◽

Specific Energy ◽

Coarse Particles ◽

Full Understanding ◽

Real Experiment ◽

Helpful Tool ◽

Ore Processing ◽

Comminution Process ◽

Particle Bed

The comminution at the grain size level for liberating the valuable minerals usually requires the highest size-specific energy. Therefore, a full understanding of the comminution process at this level is essential. Models based on the Discrete Element Method (DEM) can become a helpful tool for this purpose. One major concern, however, is the missing representativeness of mineral microstructures in the simulations. In this study, a method to overcome this limitation is presented. The authors show how a realistic microstructure can be implemented into a particle bed comminution simulation using grain-based models in DEM (GBM-DEM). The improved algorithm-based modeling approach is exemplarily compared to an equivalent real experiment. The simulated results obtained within the presented study show that it is possible to reproduce the interfacial breakage observed in real experiments at the grain size level. This is of particular interest as the aim of comminution in mineral processing is not only the size reduction of coarse particles, but often an efficient liberation of valuable components. Simulations with automatically generated real mineral microstructures will help to further improve the efficiency of ore processing.

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