Liberation-limited grade/recovery curves from X-ray micro CT analysis of feed material for the evaluation of separation efficiency

Miller, Jan D.; Lin, Chenyu; Hupka, Lukasz; Al-Wakeel, Mohamed I.

doi:10.1016/j.minpro.2009.05.009

Cited by 66 publications

(22 citation statements)

References 8 publications

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“…In addition, FD has mathematical ambiguity in terms of the dimensional difference between r and g; and has limitation in the range of r in which Equation (6) shows linear relationship in the double logarithmic chart. However, it is practically valuable for texture analysis within a certain range of r. …”

Section: Fractal Dimension Technique (Fd)mentioning

confidence: 99%

“…Several means have been employed to directly measure the 3D liberation state without stereological bias, such as X-ray computed tomography (CT) [5][6][7][8][9][10], serial sectioning [11][12][13], and dense medium separation using heavy liquids [14] or magnetic fluid [15]. However, these all have disadvantages for 1. visualize the mineral phases in the particle sections, using existing methods such as MLA [1,2] (Figure 1(i)); 2.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Seven Texture Analysis Indices for Their Applicability to Stereological Correction of Mineral Liberation Assessment in Binary Particle Systems

2017

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An effective correction method for stereological bias is required because of the importance of accurate assessment of mineral liberation of ore particles. Stereological bias is error caused by the estimation of a three-dimensional liberation state based on two-dimensional sectional measurements. Recent studies have proposed a stereological correction method based on sectional particle texture analysis, which employs numerical particle models. However, the applicability of this method to unfamiliar particle systems, with different shape and texture characteristics from the numerical particle model, has not been thoroughly investigated. In this study, the viability of the method for examination of the internal structure and shape of unfamiliar particles, was assessed using four types of particle systems, based on combinations of two types of internal structures (Boolean and Voronoi) and two types of particle shapes (spherical and irregular). Seven different texture analysis indices were utilized for composition distribution correction with regard to each of the four types of particle systems. The results suggested that a model based on the angular second moment and/or entropy, employed by the spatial gray level dependence method, showed the greatest viability for assessment of unfamiliar particle internal structure and/or shape.

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Section: Fractal Dimension Technique (Fd)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Seven Texture Analysis Indices for Their Applicability to Stereological Correction of Mineral Liberation Assessment in Binary Particle Systems

2017

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“…These images are then mathematically reconstructed to yield a stack of 2D images, which can be rendered in 3D using visualization software. Such 3D images obtained disciplines, such as geoscience [17], for the imaging of embedded features; material science, for the imaging of void structures within polymer foams [18,19]; in paleontology, for the imaging of fossilized embryos [20]; and in mineral processing, for mineral exposure [21] and liberation [22,23] analysis. A disadvantage of micro-CT is that it does not yield specific elemental information (which can be obtained from confocal MXRF); however, high absorption particles embedded in a low absorption matrix can easily be detected based on regions of concentrated high grayscale values.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Three dimensional subsurface elemental identification of minerals using confocal micro-X-ray fluorescence and micro-X-ray computed tomography

Cordes

Seshadri

Havrilla

et al. 2015

Spectrochimica Acta Part B: Atomic Spectroscopy

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Current non-destructive elemental characterization methods, such as scanning electron microscopy-based energy dispersive spectroscopy (SEM-EDS) and micro X-ray fluorescence spectroscopy (MXRF), are limited to either elemental identification at the surface (SEM-EDS) or suffer from an inability to discriminate between surface or depth information (MXRF). Thus, a non-destructive elemental characterization of individual embedded particles beneath the surface is impossible with either of these techniques. This limitation can be overcome by using laboratory-based 3D confocal micro X-ray fluorescence spectroscopy (confocal MXRF). This technique utilizes focusing optics on the X-ray source and detector which allows for spatial discrimination in all three dimensions. However, the voxel-by-voxel serial acquisition of a 3D

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“…This has been studied for the example of phosphate samples by X-ray micro-computer tomography, with better results in comparison to a 2D analysis [20].…”

Section: Fractionsmentioning

confidence: 99%

Use of Mineral Liberation Analysis (MLA) in the Characterization of Lithium-Bearing Micas

Sandmann¹,

Gutzmer²

2013

JMMCE

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The capabilities and opportunities of the application of automated mineralogy for the characterization of lithium-bearing zinnwaldite-micas are critically assessed. Samples of a crushed greisen-type ore comprising mostly of quartz, topaz and zinnwaldite (Li-rich mica) were exposed to further comminution by cone crusher and high voltage pulse power fragmentation. Product properties were analyzed by using a Mineral Liberation Analyser (MLA) and the obtained mineralogical and mineral processing relevant parameters were carefully evaluated with special focus on the characteristics of zinnwaldite. The results illustrate that both samples contain a significant quantity of very fine particles that are products of comminution. The modal mineralogy in the different sieve fractions is characterized by the accumulation of minerals of low hardness in the finest fraction and the enrichment of topaz, having a high hardness, in the somewhat larger fractions. Based on the results of mineral association data for zinnwaldite, a displacement of the muscovite-quartz ratio, in comparison to the results of modal mineralogy, was observed by indicating good quartz-zinnwaldite boundary breakage and weak muscovite-zinnwaldite breakage. Liberation as well as mineral grade recovery curves indicate that fraction -1000 to +500 µm is most suitable for beneficiation. The results of this study demonstrate that SEM-based image analysis, such as MLA, can effectively be used to investigate and evaluate phyllosilicate minerals in a fast and precise way. It is shown that the results of MLA investigations, such as modal mineralogy, are in good agreement with other analytical methods such as quantitative X-ray powder diffraction.

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Liberation-limited grade/recovery curves from X-ray micro CT analysis of feed material for the evaluation of separation efficiency

Cited by 66 publications

References 8 publications

Comparison of Seven Texture Analysis Indices for Their Applicability to Stereological Correction of Mineral Liberation Assessment in Binary Particle Systems

Comparison of Seven Texture Analysis Indices for Their Applicability to Stereological Correction of Mineral Liberation Assessment in Binary Particle Systems

Three dimensional subsurface elemental identification of minerals using confocal micro-X-ray fluorescence and micro-X-ray computed tomography

Use of Mineral Liberation Analysis (MLA) in the Characterization of Lithium-Bearing Micas

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