| Alternative beneficiation of tantalite and removal of radioactive oxides from Ethiopian Kenticha pegmatite-spodumene ores |
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| 引用本文： | Berhe Goitom Gebreyohannes,Vel&#,zquez del Rosario Alberto,Abubeker Yimam,Girma Woldetinsae,Bogale Tadesse. Alternative beneficiation of tantalite and removal of radioactive oxides from Ethiopian Kenticha pegmatite-spodumene ores[J]. 矿物冶金与材料学报, 2017, 24(7): 727-735. DOI: 10.1007/s12613-017-1456-8 |
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| 作者姓名： | Berhe Goitom Gebreyohannes Vel&# zquez del Rosario Alberto Abubeker Yimam Girma Woldetinsae Bogale Tadesse |
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| 作者单位： | School of Materials Science and Engineering, Jimma Institute of Technology, Jimma University, P.O. Box 378, Jimma, Ethiopia |
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| 摘 要： | The beneficiation methods for Ethiopian Kenticha pegmatite-spodumene ores were assessed through mineralogical and quantitative analyses with X-ray diffraction (XRD) and energy-dispersive X-ray fluorescence (EDXRF). The tantalite in the upper zone of the Kenticha pegmatite-spodumene deposit is 58.7wt% higher than that in the inner zone. XRD analysis revealed that the upper zone is dominated by manganocolumbite, whereas the inner zone is predominantly tantalite-Mn. Repeated cleaning and beneficiation of the upper-zone ore resulted in concentrate compositions of 57.34wt% of Ta2O5 and 5.41wt% of Nb2O5. Washing the tantalite concentrates using 1vol% KOH and 1 M H2SO4 led to the removal of thorium and uranium radioactive oxides from the concentrate. The findings of this study suggest that the beneficiation and alkaline washing of Kenticha pegmatite-spodumene ores produce a high-grade export-quality tantalite concentrate with negligible radioactive oxides.
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| 关 键 词： | beneficiation manganocolumbite pegmatite-spodumene radioactive oxides tantalite |
Alternative beneficiation of tantalite and removal of radioactive oxides from Ethiopian Kenticha pegmatite–spodumene ores |
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| Berhe Goitom Gebreyohannes,Velázquez del Rosario Alberto,Abubeker Yimam,Girma Woldetinsae,Bogale Tadesse. Alternative beneficiation of tantalite and removal of radioactive oxides from Ethiopian Kenticha pegmatite–spodumene ores[J]. International Journal of Minerals,Metallurgy and Materials, 2017, 24(7): 727-735. DOI: 10.1007/s12613-017-1456-8 |
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| Authors: | Berhe Goitom Gebreyohannes Velázquez del Rosario Alberto Abubeker Yimam Girma Woldetinsae Bogale Tadesse |
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| Affiliation: | 1. School of Materials Science and Engineering, Jimma Institute of Technology, Jimma University, P.O. Box 378, Jimma, Ethiopia;Chemistry Department, College of Natural and Computational Science, Mekelle University, P.O. Box 823, Mekelle, Ethiopia;2. School of Materials Science and Engineering, Jimma Institute of Technology, Jimma University, P.O. Box 378, Jimma, Ethiopia;3. School of Chemical and Bio Engineering, AAiT, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia;4. Research and Development Directorate, Federal Democratic Republic of Ethiopia, Ministry of Mines, Petroleum and Natural Gas, P.O. Box 486, Addis Ababa, Ethiopia;5. Department of Mining Engineering and Metallurgical Engineering, Western Australian School of Mines, Curtin University, Egan St, Kalgoorlie, WA 6430, Australia |
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| Abstract: | The beneficiation methods for Ethiopian Kenticha pegmatite–spodumene ores were assessed through mineralogical and quantitative analyses with X-ray diffraction (XRD) and energy-dispersive X-ray fluorescence (EDXRF). The tantalite in the upper zone of the Kenticha pegmatite–spodumene deposit is 58.7wt% higher than that in the inner zone. XRD analysis revealed that the upper zone is dominated by manganocolumbite, whereas the inner zone is predominantly tantalite?Mn. Repeated cleaning and beneficiation of the upper-zone ore resulted in concentrate compositions of 57.34wt% of Ta2O5 and 5.41wt% of Nb2O5. Washing the tantalite concentrates using 1vol% KOH and 1 M H2SO4 led to the removal of thorium and uranium radioactive oxides from the concentrate. The findings of this study suggest that the beneficiation and alkaline washing of Kenticha pegmatite–spodumene ores produce a high-grade export-quality tantalite concentrate with negligible radioactive oxides. |
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| Keywords: | beneficiation manganocolumbite pegmatite-spodumene radioactive oxides tantalite |
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