Determination of metallization degree of pre-reduced chromite with image and rietveld analysis
Metallization degree of pre-reduced chromite was determined using two methods. The chromite samples were reduced in the solid state by methane-hydrogen gas mixtures. First method was image analysis of micrographs obtained by scanning electron microscope where heavier metallic phases appeared as brig...
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| Format: | Article |
| Language: | English |
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University of Belgrade, Technical Faculty, Bor
2020-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000022L.pdf |
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| author | Leino T. Taskinen P. Eric R.H. |
| author_facet | Leino T. Taskinen P. Eric R.H. |
| author_sort | Leino T. |
| collection | DOAJ |
| description | Metallization degree of pre-reduced chromite was determined using two methods. The chromite samples were reduced in the solid state by methane-hydrogen gas mixtures. First method was image analysis of micrographs obtained by scanning electron microscope where heavier metallic phases appeared as bright white areas which were relatively easy to segment using a thresholding algorithm. The second technique was Rietveld analysis of X-ray powder diffraction pattern which fitted a calculated profile onto a measured X-ray diffraction pattern to gain information about phase quantities. Rietveld refinement and phase composition analysis was performed with PANalytical’s X’Pert HighScore Plus software from the XRPD (X-ray powder diffraction) data. Both techniques were in good agreement. Metallization degrees for the investigated samples ranged from 15 to 65 % depending on the extent of reduction which was a function of time, reduction temperature, and methane content of the gas mixture. These results were promising and indicate that either image analysis or X-ray Rietveld analysis can be used as a relatively fast method to determine the degree of metallization of pre-reduced samples in comparison to the slow and tedious chemical analysis. |
| format | Article |
| id | doaj-art-ee9b8cc887204fe694c262407b86169e |
| institution | Kabale University |
| issn | 1450-5339 2217-7175 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-ee9b8cc887204fe694c262407b86169e2025-02-02T12:13:53ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392217-71752020-01-0156328929710.2298/JMMB200313022L1450-53392000022LDetermination of metallization degree of pre-reduced chromite with image and rietveld analysisLeino T.0Taskinen P.1Eric R.H.2Department of Chemical and Metallurgical Engineering, Aalto University, Aalto, FinlandDepartment of Chemical and Metallurgical Engineering, Aalto University, Aalto, FinlandSchool of Chemical and Metallurgical Engineering, University of the Witwatersrand, WITS, South AfricaMetallization degree of pre-reduced chromite was determined using two methods. The chromite samples were reduced in the solid state by methane-hydrogen gas mixtures. First method was image analysis of micrographs obtained by scanning electron microscope where heavier metallic phases appeared as bright white areas which were relatively easy to segment using a thresholding algorithm. The second technique was Rietveld analysis of X-ray powder diffraction pattern which fitted a calculated profile onto a measured X-ray diffraction pattern to gain information about phase quantities. Rietveld refinement and phase composition analysis was performed with PANalytical’s X’Pert HighScore Plus software from the XRPD (X-ray powder diffraction) data. Both techniques were in good agreement. Metallization degrees for the investigated samples ranged from 15 to 65 % depending on the extent of reduction which was a function of time, reduction temperature, and methane content of the gas mixture. These results were promising and indicate that either image analysis or X-ray Rietveld analysis can be used as a relatively fast method to determine the degree of metallization of pre-reduced samples in comparison to the slow and tedious chemical analysis.http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000022L.pdfferrous chromitemetallizationimage analysisrietveld analysis |
| spellingShingle | Leino T. Taskinen P. Eric R.H. Determination of metallization degree of pre-reduced chromite with image and rietveld analysis Journal of Mining and Metallurgy. Section B: Metallurgy ferrous chromite metallization image analysis rietveld analysis |
| title | Determination of metallization degree of pre-reduced chromite with image and rietveld analysis |
| title_full | Determination of metallization degree of pre-reduced chromite with image and rietveld analysis |
| title_fullStr | Determination of metallization degree of pre-reduced chromite with image and rietveld analysis |
| title_full_unstemmed | Determination of metallization degree of pre-reduced chromite with image and rietveld analysis |
| title_short | Determination of metallization degree of pre-reduced chromite with image and rietveld analysis |
| title_sort | determination of metallization degree of pre reduced chromite with image and rietveld analysis |
| topic | ferrous chromite metallization image analysis rietveld analysis |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000022L.pdf |
| work_keys_str_mv | AT leinot determinationofmetallizationdegreeofprereducedchromitewithimageandrietveldanalysis AT taskinenp determinationofmetallizationdegreeofprereducedchromitewithimageandrietveldanalysis AT ericrh determinationofmetallizationdegreeofprereducedchromitewithimageandrietveldanalysis |