tantalite, tantalum-rich variety of the mineral columbite (q.v.) with the chemical formula (Fe,Mn) (Ta,Nb) 2 O 6. Tantalite is the principal ore of the metal tantalum.
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— The formation of columbite-group mineral phases in peraluminous granite has not been demonstrated to date. Here, a nanoscale study of the columbite-tantalite mineral in the Zhaojinggou Nb-Ta ...
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— Three mineral species of the columbite group were installed at the Kester deposit (Eastern Yakutia): columbite-(Fe), columbite-(Mn) and tantalite-(Mn), which are part of rare-metal granites and ...
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— Request PDF | An Investigation on Hydrofluoric (HF) Acid-Free Extraction for Niobium Oxide (Nb2O5) and Tantalum Oxide (Ta2O5) from Columbite/Tantalite Concentrates Using Alkali Reductive Roasting ...
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Tantalite stone is an ore of tantalum, which is mined for its use in mobile phones and other electronic equipment. It is chemically similar to Columbite, so you may also see it called columbite-tantalite in some places. It is also known by two other names depending on the exact makeup of the stones.
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— The leaching of columbite-tantalite in the HF-H 2 SO 4 media is complex as H 2 SO 4 most probably reacts with Fe and Mn whereas HF brings Ta and Nb in solution by forming niobic and tantalic acids.
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The decrease of Nb/Ta in columbite– tantalite and of Zr/Hf in zircon is consistent with fractionation of a silicate melt (Linnen and Keppler, 1997, 2002). The most contentious question concerning the magmatic controls of mineralization is how the ore minerals, primarily columbite–tantalite, become saturated.
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— Chlorination of columbite-tantalite concentrate is usually carried out in the presence of different forms of carbon, carbon monoxide and chlorinating agents such as CCl 4, COCl 2, or a mixture of CO and Cl 2 (Gonzalez, 1998, Gonzalez et al., 1998; González and Rivarola, 1998; Jere et al., 1961, Ruiz et al., 1997, Suri, 2017). Jere and …
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— The recent work related to columbite-tantalite chemistry from the Kibara Belt was mainly focused on building an African-scale database to identify regional and local differences in Ta-Nb deposits (Melcher et al., 2015). In the research they correctly noticed a wide compositional range of Ta-Nb oxides with predominance of CGM, however no ...
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— Columbite-tantalite minerals commonly have a broad range of U contents that may reach several thousand ppm and may substitute for Fe and Mn into the crystal lattice, but for high U contents may form phases of its own (e.g., uraninite; cf. Romer et al., 1996). Furthermore, columbite-tantalite minerals typically have very low common Pb contents ...
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— In this study, the columbite-tantalite group minerals (CGMs) from a typical Li-rich pegmatite dike were analyzed for major element contents using an EMPA (electron microprobe analyzer), for trace ...
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PDF | On Jan 1, 2008, F. Melcher and others published Finger of conflict minerals: columbite-tantalite ("coltan") ores | Find, read and cite all the research you need on ResearchGate
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— The columbite–tantalite samples selected for this pilot study come from three pegmatite locations in North America: (1) the Starrett pegmatite in southern Maine; (2) the BeeBee/PackRat pegmatite in San Diego County, California; and (3) the Moose pegmatite in the east-central Northwest Territories, Canada [6–12].The 14 samples analyzed …
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PDF | On Jul 1, 2023, Jakub Ryznar and others published Mineralogy and chemistry of columbite-tantalite from Bugarura-Kuluti area, Karagwe-Ankole Belt, Rwanda: Indicators of pegmatite and granite ...
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— Background The release of environmental pollutants such as heavy metals due to mining activities has received worldwide condemnation. Therefore, understanding the contamination of both …
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The Separation Lake area is host to the most important rare-element pegmatites in Ontario, Canada. They include the Big Whopper and Big Mack petalite pegmatite systems which potentially represent the world's second largest lithium deposit of this type. The pegmatites occur in two distinct clusters adjacent to the Separation Rapids pluton which is thought …
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— COLTAN (Columbite-Tantalite) is a dull metallic ore found in major quantities in the eastern areas of Congo. When refined, COLTAN becomes metallic Tantalum, a …
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Tantalite is the tantalum-rich member, and Columbite is the niobium-rich member. Tantalite is named after its tantalum content, and, together with Columbite, are the most important …
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— Therefore, a systematic study of texture, major-element composition, and U-Pb dating of columbite-tantalite group minerals (CGMs) in the spodumene pegmatite dyke from the CKBS deposit was undertaken. ... All authors have read and agreed to the published version of the manuscript. Funding. The present study was financially …
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— LCT (lithium–cesium–tantalum) pegmatites from the Kaustinen and Kolmozero regions contain columbite–tantalite mineralization, which has been presented in this study. Crystal structure, Raman microscopy, and optical property analyses of these minerals were performed. As a result of the structural studies and micro-area analyses, it was …
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— We successfully report a liquid–liquid chemical reduction and hydrothermal synthesis of a highly stable columbite-tantalite electrocatalyst with remarkable hydrogen evolution reaction (HER) and …
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— At the Kester Deposit, the evolution of columbite–tantalite is accompanied by an increase in Ta/Nb, Mn/Fe, and Sn/W ratios manifested in the change of columbite by tantalite both in the process of the formation of ore-bearing rocks and in the rock series: rare-metal granites → albitites → greisens.
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— Hydrothermal origin of columbite-tantalite is observed in greisens, expressed by a higher W concentration and coeval or even younger crystallization compared to the …
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— Three major groups are identified given textural and chemical characteristics of CGM, i.e., (i) Group I displays systematic core-rim evolution from columbite to tantalite, and eventually to ...
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— In this study, the columbite-tantalite group minerals (CGMs) from a typical Li-rich pegmatite dike were analyzed for major element contents using an EMPA (electron microprobe analyzer), for trace element contents using LA-ICP-MS (laser ablation-inductively coupled plasma mass spectrometry), and for ages using LA-ICP-MS U-Pb …
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— To read the full-text of this research, you can request a copy directly from the authors. Request full-text. ... The columbite–tantalite-series minerals are columbite-(Fe), and their paragenesis ...
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Download Citation | On Jan 1, 2020, Kejun Hou and others published A Potential Reference Material for in situ U-Pb Dating of Columbite-Tantalite | Find, read and cite all the research you need on ...
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— A FIB slice revealed that the mineral structure was relatively well-ordered by TEM and the columbite-tantalite mineral contained Nb, Ta, Mn, W, Fe, Sn, and Pb examined using EDS. The hydrothermal fluid was enriched in K, Al, Si, and O, which is different from the composition of the columbite-tantalite mineral.
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— The chlorination of columbite-tantalite in the presence of a reducing carbon bed produces a mixture of volatile tantalum, niobium, iron, tin, aluminium and manganese chlorides along with niobium oxychloride. Gaballah et al. (1997) studied the chlorination of Ta and Nb oxides in tin slag at 1000 °C. Approximately 95 % Ta and Nb compounds with ...
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— The time taken for determining Nb 2 O 5, Ta 2 O 5, FeO, MnO, and U 3 O 8 in a batch of twentyfour samples of columbite-tantalite, for a replication of four analyses per sample, by one operator ...
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— COLTAN (Columbite-Tantalite) is a dull metallic ore found in major quantities in the eastern areas of Congo. When refined, COLTAN becomes metallic Tantalum, a heat-resistant powder that can hold a high electrical charge. Columbite ((Fe, Mn, Mg)(Nb, Ta) 2 O 6: Iron Manganese Magnesium Niobium Tantalum Oxide) is the most abundant …
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— Download full-text PDF Read full-text. Download full-text PDF. Read full-text. Download citation. ... Since 2006, our working group has been investigating columbite-tantalite (coltan ...
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— Transmission electron microscopy (TEM) analysis of a focused ion beam cut of the columbite-tantalite mineral revealed a comparatively well-ordered mineral …
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— Request PDF | LA-ICP-MS U–Pb zircon, columbite-tantalite and 40Ar–39Ar muscovite age constraints for the rare-element pegmatite dykes in the Altai orogenic belt, NW China | The Chinese Altai ...
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Columbite-tantalite-bearing granitoids of the Eastern Desert province of Egypt can be categorized into: (i) metaluminous alkali granites; (ii) peraluminous Li-albite granites; and (iii) metasomatized biotite and/or muscovite granite (i.e. apogranites). Columbite of the alkali granite is of FeNb 2 O 6 composition and associated with annite. The ...
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Columbite-tantalite refers to a group of minerals having varying amounts of iron, manganese, niobium, and tantalum. They are found as platey black grains in complex …
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