3D characterization of individual multiphase particles in packed particle beds by X-ray microtomography (XMT)

Videla, Álvaro; Lin, C.L.; Miller, Jan D.

doi:10.1016/j.minpro.2006.07.009

Cited by 46 publications

(28 citation statements)

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“…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%

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: 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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“…2) extrahiert werden. Die bisherigen Ansätze [7] verwenden überwiegend Watershed [8] oder ähnliche Verfahren [9]. Dieser Algorithmus erlaubt es theoretisch beliebige sternförmige Regionen zu segmentieren und so die Einzelpartikel zu erfassen.…”

Section: Introductionunclassified

Einsatz von Bilderkennung zur Auswertung tomographischer Aufnahmen für die Erfassung vom Partikelformen

Gilson

Bröckel

2015

Chemie Ingenieur Technik

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Zahlreiche Materialeigenschaften von Feststoffen werden von der Partikelmorphologie beeinflusst. Die exakte, schnelle und kostengünstige Bestimmung der inneren und äußeren Morphologie von Partikeln ist deshalb von großem Interesse. Durch die Kombination von Watershed und des Active Contour Model konnte die Vermessung der Partikelformen erheblich vereinfacht werden. Die Technik ist anwendbar auf eine Vielzahl von Partikelkollektiven und ermöglicht die Generierung einer ausreichenden Anzahl von Formen zur statischen Charakterisierung von Partikeln binnen weniger Stunden.

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“…A determinação das características microestruturais, tais como composições química e mineral, continuidade de fases, forma, associações minerais, espectro de liberação, área interfacial, dentre outras, é normalmente efetuada a partir de medições de partículas minerais em seções polidas, onde apenas uma parte das mesmas é exposta para a caracterização textural, o que leva a uma descrição incompleta da distribuição espacial das fases minerais (1D ou 2D -uni ou bidimensional). Além disso, algumas características são assumidas com base em informações texturais ou através de probabilidade geométrica, a fim de se realizar a correção estereológica a qual é limitada para situações de mais de duas fases (VIDELA et al, 2007).…”

Section: Introductionunclassified

Microtomografia De Alta Resolução No Setor Mineral

Uliana

Kahn²,

Contessotto³

et al. 2014

HOLOS

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A técnica de microscopia por tomografia de raios X (MRX) oferece uma capacidade única para análise de associações, morfologia e liberação de múltiplas fases através da aquisição direta de imagens tridimensionais de alta resolução. Trata-se de uma técnica de análise 3D não invasiva atualmente utilizada no setor mineral para caracterização de carvão, minerais industriais e de base, além de metais preciosos, complementando técnicas de microscopia já existentes como MLA e QEMSCAN. A técnica já é empregada há algum tempo na indústria do petróleo para a caracterização de tamanho e distribuição de poros, permitindo simular o fluxo de óleo em rochas reservatório. Além disso, a caracterização de poros em 3D permite a simulação de fluxo em processos de lixiviação. Requerendo pouca ou nenhuma preparação da amostra, comparativamente às técnicas de microscopia bi ou unidimensionais, proporciona vantagens como a preparação muito mais ágil da amostra, aquisição direta de dados volumétricos, análise quantitativa em 3D e menor tempo de análise aliado a maior representatividade do material analisado. Particularmente em estudos de metais preciosos, tem-se um significativo aumento na probabilidade de detecção dos minerais de interesse. Recentes avanços com o emprego de dupla magnificação -projeção cônica aliada à utilização de lentes ópticas -possibilitam a aquisição de imagens com resolução submicrométrica com sensível melhoria no contraste entre as fases.PALAVRAS-CHAVE: microtomografia, análise de imagens 3D, microscopia de raios X. HIGH RESOLUTION MICROTOMOGRAPHY ON MINING SECTOR ABSTRACTThe technique of microscopy by X-ray computed tomography (XRM) offers a unique ability to analyze association, morphology and liberation of multiple phases through direct acquisition of high-resolution three-dimensional images. It is a non-invasive technique of 3D analysis currently used in the industry for characterization of coal, industrial and base minerals, besides precious metals, complementing existing microscopy techniques such as MLA and QEMSCAN. The technique is already used for some time in the petroleum industry to characterize the pore size distribution, allowing oil flow simulation in reservoir rocks. Furthermore, the 3D characterization of pores allows flow simulations in leaching processes. Requiring little or no sample preparation, compared to two or one-dimensional microscopy techniques, it provides advantages such as much more agile sample preparation, direct acquisition of volumetric data, quantitative 3D analysis and less time analysis allied to major representativity of the analyzed material. Particularly in studies of precious metals there is a significant probability increase of interest minerals detection. Recent advances like dual magnificationconical projection allied to optical lens -allow images acquisition with sub-micrometric resolution combined with considerable improvement in phases contrast.

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3D characterization of individual multiphase particles in packed particle beds by X-ray microtomography (XMT)

Cited by 46 publications

References 4 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

Einsatz von Bilderkennung zur Auswertung tomographischer Aufnahmen für die Erfassung vom Partikelformen

Microtomografia De Alta Resolução No Setor Mineral

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