Data publication from the Master's thesis "Mapping Metal Phase Distribution in Historical Muldenhütten Slag Using X-ray Computed Tomography" by Mahsa Abdolahzade.

Abdolahzade, Mahsa; Renno, Axel D.; Debastiani, Rafaela; Ebert, Doreen; Guy, Bradley; Moeckel, Robert

doi:10.14278/rodare.4769

July 28, 2026 Dataset Open Access

Data publication from the Master's thesis "Mapping Metal Phase Distribution in Historical Muldenhütten Slag Using X-ray Computed Tomography" by Mahsa Abdolahzade.

Abdolahzade, Mahsa; Renno, Axel D.; Debastiani, Rafaela; Ebert, Doreen; Guy, Bradley; Moeckel, Robert

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    <subfield code="a">&lt;p&gt;Data publication from the Master&amp;#39;s thesis &amp;quot;&lt;strong&gt;Mapping Metal Phase Distribution in Historical Muldenh&amp;uuml;tten Slag Using X-ray Computed Tomography&lt;/strong&gt;&amp;quot; by &lt;strong&gt;Mahsa Abdolahzade&lt;/strong&gt;.&lt;/p&gt;

&lt;p&gt;The data is described in the file &amp;quot;Data publication description relative to the Master thesis Mahsa&amp;nbsp;Abdolahzade&amp;quot;&lt;/p&gt;

&lt;p&gt;Abstract:&amp;nbsp;&lt;br&gt;
Historical metallurgical slags are heterogeneous multiphase materials in which metal-rich constituents may occur as highly localised internal domains. This thesis developed and evaluated an X-ray computed tomography (XCT) workflow for the non-destructive three-dimensional characterisation of selected historical Muldenh&amp;uuml;tten slags. The methodological focus was the distinction and quantification of three broad attenuation-based classes: internal pores, the dominant slag matrix and high-attenuation features.&lt;/p&gt;

&lt;p&gt;Multiscale XCT was applied to samples MS15 and MS18 from slag group SL7 and MS35 from slag group SL3. Fragment scans were used to visualise internal heterogeneity and guide region-of-interest selection, followed by higher-resolution scanning of 11 extracted cylindrical cores. Scan-specific grey-value thresholds, spatial masks and connected-component analysis were used to quantify class volumes and evaluate feature connectivity.&amp;nbsp;Complementary micro-X-ray fluorescence mapping and targeted SEM&amp;ndash;EDS and mineral liberation analysis (MLA) constrained the chemical and mineralogical interpretation of selected XCT-visible regions, while existing X-ray diffraction data provided sample-level context.&lt;/p&gt;

&lt;p&gt;The slag matrix dominated all analysed cores, accounting for 86.38&amp;ndash;98.02 vol.%. Internal pore fractions ranged from 0.62 to 7.57 vol.%, while high-attenuation material generally represented 0.59&amp;ndash;2.80 vol.%. MS15-01-C1 was a clear exception, containing 12.90 vol.% high-attenuation material, of which 88.2% occurred in one connected region. Correlative &amp;micro;XRF and MLA results identified this feature as a localised Pb-rich metallic domain containing native Pb, Sb-bearing alloys and subordinate sulphide-bearing phases. The remaining investigated volumes were predominantly silicate dominated and contained smaller, more dispersed high-attenuation features.&lt;/p&gt;

&lt;p&gt;The results demonstrate that conventional grey-value segmentation is suitable for quantifying broad structural and attenuation classes where sufficient contrast exists, but not for complete mineral-specific classification of complex slag. Overlapping attenuation responses, scan-dependent grey values, spatial-resolution limits, artefacts and partial-volume effects restricted phase separation. The developed workflow is therefore most effective as a non-destructive localisation and volumetric characterisation method integrated with targeted chemical and mineralogical analyses. It provides a basis for representative sample selection and future metal-deportment, recovery and environmental studies, while the results remain specific to the analysed fragments and core volumes.&lt;br&gt;
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Publication date:

July 28, 2026

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Keyword(s):

X-ray computed tomography historical metallurgical slag method development threshold segmentation correlative characterisation Muldenhütten

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https://www.hzdr.de/publications/Publ-43694

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Data publication from the Master's thesis "Mapping Metal Phase Distribution in Historical Muldenhütten Slag Using X-ray Computed Tomography" by Mahsa Abdolahzade.

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Data publication from the Master's thesis "Mapping Metal Phase Distribution in Historical Muldenhütten Slag Using X-ray Computed Tomography" by Mahsa Abdolahzade.

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