Application of Computer X-Ray Microtomography for Study of Technological Properties of Rocks

Duryagina, A.M.; Talovina, I. V.; Shtyrlyaeva, A.A.; Попов, О. Н.

doi:10.4028/www.scientific.net/kem.769.220

Cited by 5 publications

(5 citation statements)

References 11 publications

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“…The Point Load Test (PLT) is employed for rock strength classification [34][35][36][37]. A notable advantage of this procedure in comparison to other methods (e.g., the Brazilian Test and uniaxial compressive strength) is its limited requirements for the preparation of rock specimens.…”

Section: Point Load Testmentioning

confidence: 99%

“…Given the presence of an empirical correlation between the Uniaxial Compressive Strength (UCS) and the Point Load Index (IS(50)), it is possible to approximate the order of magnitude of the UCS by multiplying the IS (50) value by a conversion factor (Equation (3)) that requires specific determination for a given ore [40,41]. The relationship between the strength index (IS (50)) and the compressive strength (σD) as a constant has been described by many researchers [35,37]. The ISRM [36] suggests indicating a relationship for the σD and the IS(50) of 20 to 25.…”

Section: Point Load Testmentioning

confidence: 99%

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Evaluation of Ni-Cu Ore from Zapolyarnoe Based on Mineralogical and Physical Properties before and after Comminution

Bravo,

Lieberwirth,

Popov

2024

Minerals

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For the effective comminution and subsequent enrichment of mineral ores, comprehensive knowledge of their mineralogical and physical properties is required. Using an integrated methodology, this study evaluated samples of polymetallic Ni-Cu ore from Zapolyarnoe, Russia. Several analytical techniques were utilised, including optical microscopy, microindentation with Vickers geometry, the Point Load Test, and Mineral Liberation Analysis (MLA). The purpose of this study was to determine mineral associations, physical features, and enrichment during jaw crusher comminution. The acquired properties included the Point Load Strength Index, Vickers Hardness Number, and fracture toughness. The MLA method characterised seven fractions in terms of particle size distribution, degree of liberation, association, and modal mineralogy. Magnetite, pyrrhotite, pentlandite, and chalcopyrite were calculated in terms of wt% and their textural features. The enrichment of each ore phase in fractions with particle sizes smaller than 400 µm was determined. The influence of this enrichment was discovered to be correlated with various textural and structural parameters, such as intergrowth, grain size, and crack morphologies after indentations. In addition, the chromium content of magnetite contributed to an increase in the fracture toughness values. Despite the complexities involved, even limited samples of materials provide valuable insights into processing behaviour, emphasising the importance of considering mineralogical parameters in comminution studies.

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Section: Point Load Testmentioning

confidence: 99%

Section: Point Load Testmentioning

confidence: 99%

Evaluation of Ni-Cu Ore from Zapolyarnoe Based on Mineralogical and Physical Properties before and after Comminution

Bravo,

Lieberwirth,

Popov

2024

Minerals

Self Cite

View full text Add to dashboard Cite

show abstract

“…A three-dimensional information or the reconstruction of minerals and rock microstructures of geological materials is required. The results of mathematical-petrographic rock characterization are a precondition for predicting the relationships between rock characteristics and relevant product properties or system characteristics (e.g., wear, energy consumption) with the help of mathematical statistical modelling (e.g., multiple regression and correlation analysis) [8,38].…”

Section: Qma-microstructural Analysis Based On Optical Microscopymentioning

confidence: 99%

Quantitative Microstructural Analysis and X-ray Computed Tomography of Ores and Rocks—Comparison of Results

et al. 2020

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Profound knowledge of the structure and texture of rocks and ores as well as the behavior of the materials under external loads is essential to further improvements in size reduction processes, particularly in terms of liberation size. New analytical methods such as computer tomography (CT) were adopted to improve the understanding of material characteristics in rocks and ores relevant to mineral processing, particular the crushing and grinding and the modelling/simulation thereof. Results obtained on the texture and structure of identical samples of rather different rocks and ores (copper ore, granodiorite, kimberlite) are compared by CT with quantitative results from traditional optical microscopy obtained by quantitative microstructural analysis (QMA). While the two approaches show a good agreement of the results in many areas, the measurements with the two different methods also exhibit remarkable differences in other areas, which are discussed further. In conclusion, both methods have their specific advantages starting from sample preparation to the accuracy of information obtained concerning certain parameters of mode and fabric. While sample preparation is faster with CT and information on special distribution of metal minerals is more reliable, the information on mode, grain size and clustering seem to be more precise with QMA. Based on the results, it can be concluded that both methods are comparable in many areas, but in in the field of spatial distribution, they are merely complementary.

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“…The method is based on reduction of the power of X-ray radiation when it passes through a certain sample volume due to absorption of X-rays, which is fixed by creating a shadow projection -a graphic file in which each pixel contains information about the amount of absorption at a given point. The result of scanning is a series of shadow images of the sample in X-ray light, which are converted into three-dimensional images for further visual studies and morphometric analysis using special software [9,10]. Optical microscopic studies were carried out using a research-grade optical polarizing microscope Axio Imager A2m (Zeiss) and software for image analysis Thixomet Pro (Russia, SPbPU), which was certified as a measurement tool.…”

Section: Experimental Research Techniquementioning

confidence: 99%

Mineralogical and morphometric aspects of the rock analysis as the basis for choosing a scheme for ore preparation

et al. 2020

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The complexity of deep processing of fine-grained and refractory mineral raw materials is determined by the difficulty of disclosing aggregates of ore components during disintegration and extracting them into commercial products of standard quality. The main task of the disintegration of such ores is to destroy the object along the phase boundaries without overgrinding while minimizing energy costs. To implement selective disintegration, a precise study of the properties of the mineral components of the ore is necessary. However, there are no systematic data on the effect and relationship of the mineralogical-technological, structural-textural and physical-technical properties of minerals, rocks and ores with the processes of selective disintegration. The article presents the results of computer microtomographic and optical-microscopic studies of the structural and textural characteristics of typical sulfide copper-nickel ores using a SkyScan-1173 microtomograph from Bruker (Belgium), as well as a specialized, accredited as a measuring tool, Thixomet Pro software (Russia). The studies made it possible to identify automatically 19 morphometric parameters of ore grains in three mutually perpendicular sections, the most informative of which were the grain size of individual ore minerals, their perimeter, distance between grains and grain shape (sphericity, edge roughness, and others). The obtained quantitative characteristics of the structural and textural parameters, the analysis of the granulometric composition of the grains of ore minerals make it possible to assess the possibility of using selective grinding at various stages of ore preparation.

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Application of Computer X-Ray Microtomography for Study of Technological Properties of Rocks

Cited by 5 publications

References 11 publications

Evaluation of Ni-Cu Ore from Zapolyarnoe Based on Mineralogical and Physical Properties before and after Comminution

Evaluation of Ni-Cu Ore from Zapolyarnoe Based on Mineralogical and Physical Properties before and after Comminution

Quantitative Microstructural Analysis and X-ray Computed Tomography of Ores and Rocks—Comparison of Results

Mineralogical and morphometric aspects of the rock analysis as the basis for choosing a scheme for ore preparation

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