Dual energy rapid scan radiography for geometallurgy evaluation and isolation of trace mineral particles

Lin, Chenyu; Hsieh, Ching Hao; Tserendagva, Tsend Ayush; Miller, Jan D.

doi:10.1016/j.mineng.2012.09.001

Cited by 9 publications

(2 citation statements)

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“…Also, since only single energy level radiography is used, materials with similar attenuation coefficients will not be distinguishable from one another. For those materials, multiple energy radiography will be needed (Lin et al, 2013;Long et al, 2009). Also, the methodology is bounded to the mineralogy presented by the SEM analysis so it can't distinguish minerals that have not been identified in the SEM analysis.…”

Section: Simplified 3d Mineralogical Mapmentioning

confidence: 99%

Calibrated X-ray micro-tomography for mineral ore quantification

Reyes

Lin

Udoudo

et al. 2017

Minerals Engineering

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Scanning Electron Microscopy (SEM) based assessments are the most widely used and trusted imaging technique for mineral ore quantification. X-ray micro tomography (XMT) is a more recent to the mineralogy toolbox, but with the potential to extend the measurement capabilities into the three dimensional (3D) assessment of properties such as mineral liberation, grain size and textural characteristics. In addition, unlike SEM based assessments which require the samples to be sectioned, XMT is non-invasive and non-destructive manner. The disadvantage of XMT, though is that the mineralogy must be inferred from the X-Ray attenuation measurements, which can make it hard to distinguish from one another, whereas SEM when coupled with Energy-Dispersive X-ray Spectroscopy (EDX) provides elemental compositions and thus a more direct method for distinguishing different minerals. A new methodology that combines both methods at the mineral grain level is presented. The rock particles used to test the method were initially imaged in 3D using XMT followed by sectioning and the 2D imaging of the slices using SEM-EDX. An algorithm was developed that allowed the mineral grains in the 2D slice to be matched with their 3D equivalents in the XMT based images. As the mineralogy of the grains from the SEM images can be matched to a range of X-Ray attenuations, this allows minerals which have similar attenuations to one another to be distinguished, with the level of uncertainty in the classification quantified. In addition, the methodology allowed for the estimation of the level of uncertainty in the quantification of grain size by XMT, the assessment of stereological effects in SEM 2D images and ultimately to obtain a simplified 3D mineral map from low energy XMT images. Copper sulphide ore fragments, with chalcopyrite and pyrite as the main sulphide minerals, were used to demonstrate the effectiveness of this procedure.

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Section: Simplified 3d Mineralogical Mapmentioning

confidence: 99%

Calibrated X-ray micro-tomography for mineral ore quantification

Reyes

Lin

Udoudo

et al. 2017

Minerals Engineering

View full text Add to dashboard Cite

show abstract

“…Examples of mineral pairs with similar X-ray attenuation which are important in the mineral processing context include chalcopyrite/magnetite and chalcocite/zircon. In cases where this occurs the use of dual energy measurements (Lin et al, 2013) which exploit differences in X-ray attenuation values at different source energies can assist in discrimination. The theoretical X-ray attenuation values (from NIST, 2010) calculated for the mineral suite in the gold-bearing pyrite ore are shown in Fig.…”

Section: Sample Selectionmentioning

confidence: 99%