Towards sustainable processing of columbite group …

The columbite concentrate from the Democratic Republic of Congo supplied by the Tantalum-Niobium International Study Centre was characterized using X-Ray powder diffraction (XRPD) with Cu-Kα ...

In situ U–Pb isotopic dating of columbite–tantalite by …

Abstract. Columbite–tantalite (Coltan) is the most important niobium (Nb)- and tantalum (Ta)-bearing economic mineral, commonly occurring in rare metal granite and pegmatite, alkaline granite, syenite and carbonatite. Its high U but low common Pb contents make it an ideal mineral for U–Pb isotopic dating of Nb–Ta mineralization.

Columbite SN3: A New Potential Reference

Coltan 139 and these three columbite-tantalite samples with variable compositions yielded internally consistent LA-ICP-MS U-Pb ages when using each other for calibration and the weighted mean 206 Pb/ 238 U ages are comparable to respective ID-TIMS ages. Composition-dependent U-Pb fractionation seems to be insignificant under …

Tantalite: The mineral columbite-tantalite information and …

The Mineral tantalite. Tantalite forms a solid solution series with Columbite known as the Columbite-Tantalite series. Tantalite is the tantalum-rich member, and Columbite is the …

In situ U–Pb isotopic dating of columbite–tantalite by …

In situ U-Pb dating of xenotime by laser ablation (LA)-ICP-MS. Zhi‐Chao Liu Fu-Yuan Wu Chunli Guo Zi‐Fu Zhao Jin-Hui Yang Jinfeng Sun. Geology. 2011. Xenotime is an ideal mineral for U-Th-Pb isotopic dating because of its relatively high U and Th contents, but typically low concentration of common Pb.

A mixed collector system for columbite-tantalite flotation

Columbite-tantalite recovery was the highest at 3:1 BHA–SIBX among the tested collector suites. Using the 3:1 mixed BHA–SIBX collector yielded a more negative columbite-tantalite in comparison to that measured with BHA alone. This indicated the improved adsorption of the BHA–SIBX mixture on the columbite-tantalite surface and …

Experimental studies of Ta2O5 and columbite–tantalite …

The dependence of columbite–tantalite (Nb2O5-59 wt. %, Ta2O5-18 wt. %) solubility as a function of solution composition, T, and P has also been investigated. Tantalum and Nb concentrations have the highest values in HF solutions at reduced conditions (up to 10−3 to 10−2 m Ta in 1 m HF). In 1 m NaF solutions, the …

Finger of conflict minerals: columbite-tantalite ("coltan") ores

Combined mineralogical-geochemical-geochronological signatures of columbite-tantalite ores are used to trace the origin of ore concentrates. Location of important ore provinces with Nb-Ta mining ...

(PDF) Benefits of cassiterite mining by artisanal miners

In its powdered form, it. is used in porcelain paint, scouring soaps, and wood. filter. (vi) Tin: It is an alloy that is basica lly used to increase. ... columbite, and tantalite) which are.

A review of tantalum resources and its production

The reduction of columbite concentrate by coal makes it possible to obtain an iron alloy that contains tin and lead, in addition to a niobiumâˆ'tantalum “pre-reduction†slag (NTPRS). ... 156: 17âˆ'20. [110] NETE M, PURCELL W, NEL J T. Separation and isolation of tantalum and niobium from tantalite using solvent extraction and ...

Columbite–Tantalite of the Kester Deposit (Eastern Yakutia)

be exhausted tin–rare-metal ores. The Kester Deposit is an ore-bearing greisen. deposit that is located at a hanging endocontact of a. harpolith of rare-metal granites at its bend, and sub-. m e ...

Columbite-tantalite (COLTAN) > ENGINEERING

When refined, COLTAN becomes metallic Tantalum, a heat-resistant powder that can hold a high electrical charge. Columbite ( (Fe, Mn, Mg) (Nb, Ta)2O6 : …

COLUMBITE (Iron Manganese Magnesium Niobium …

Tantalite's greatest difference from columbite is its much higher specific gravity, 8.0+ compared to columbite's 5.2. Other properties that vary slightly are color, transparency and streak. Both minerals can be found more or less together in granitic pegmatites rich in lithium and phosphorus minerals with columbite concentrated at the edges of ...

(PDF) Ultrastructure of a Columbite-Tantalite Mineral from …

The ultrastructure of the columbite-tantalite mineral suggested the columbite-group mineral in the Zhaojinggou Nb-Ta deposit formed during magmatic crystallization rather than from hydrothermal ...

Columbite: The mineral columbite-tantalite information and …

Columbite is the niobium-rich member, and Tantalite is the tantalum-rich member. Columbite is named after its niobium content, which was previous known as …

Mineralogical Features of Columbite from Rare-Metal …

Abstract. The Zashikhinsky massif is unique tantalum-niobium deposit of alkaline-granite type hosted by the Late Paleozoic rare-metal zone of magmatism in the East Sayan Mountains. Columbite is the mineral concentrating Nb, Ta and Y-group elements. It forms both large (2–5 mm) and small (smaller 0.5 mm) black grains, in …

U-Pb columbite-tantalite chronology of rare-element

Columbite-tantalite minerals are potentially useful for dating the emplacement age of economically important rare-element pegmatites. Romer and Wright have shown that columbite-tantalite may accommodate considerable amounts of uranium (circa 500–1000 ppm) and exclude lead almost completely.The U-Pb systematics, …

Tantalum (Ta) [Z = 73]

The columbite group is a solid solution with varying proportions of Nb or Ta in its composition. According to the International Mineralogical Association (IMA), 'tantalite' or 'coltan' are not scientific names, yet they are widely used. Many specimens commonly named tantalite are actually minerals of the columbite or tapiolite group ...

Columbite-tantalite mineral chemistry from rare-element …

This study reveals that columbite-tantalite in the pegmatites has an extremely wide range of composition from primitive ferrocolumbite to evolved, almost end-member manganotantalite. Evidence is provided that melt evolution resulted in increased fluorine activity (as seen in microlite compositions) and that in situ fractionation of magma within ...

Towards sustainable processing of columbite group minerals …

The columbite concentrate from the Democratic Republic of Congo supplied by the Tantalum-Niobium International Study Centre was characterized using …

Extractive metallurgy of columbite-tantalite ore: A detailed …

The increased demand of metals such as tantalum (Ta) and niobium (Nb) reflect the on-going development in modern science, engineering and technology. The extraction of these two metals from columbite-tantalite ore is based on generic extractive metallurgy. However, the upstream purification of ore and downstream extraction of Ta …

Columbite–Tantalite of the Kester Deposit (Eastern Yakutia)

Abstract. Three mineral types of the columbite group have been revealed at the Kester Deposit (Eastern Yakutia), that is, columbite- (Fe), columbite- (Mn) and …

U-Pb isotopic dating of columbite-tantalite minerals: Development of

Columbite-tantalite LA-ICP-MS U-Pb dating is a fast and useful method to determine the age of rare-metal deposits and fingerprint the provenance of columbite-tantalite ore concentrates. Accurate ...

Tantalite Solubility in Granitoid Melts and Evaluation of

Abstract The paper presents experimental data on tantalite solubility in water-saturated granitoid melts with various alumina and alkaline elements concentrations at T = 650–850°C and P = 100 MPa. The maximum Ta concentration (effective solubility) in melt is shown to be always higher than the Nb concentration. As the melt composition is …

Episodic Nb–Ta mineralisation in South China

23 Columbite-tantalite ages from 14 Nb–Ta deposits in South China were reported. • Five distinct Nb–Ta mineralisation events (424–391, 248–204, 160–150, ∼130, and ∼90 Ma) in South China were revealed.

Textural and mineral-chemistry constraints on …

CGM crystals are commonly zoned concentrically, with a Nb-rich core surrounded by a Ta-rich rim, with a sharp boundary between them. Convoluted zoning occurs also. Dissolution textures resulting from the …

⇉Columbite Tantalite

Coltan, short for columbite tantalite, is the principal source of tantalum, a rare and valuable metal in huge demand in today's high technology industries. ... The branch of Bayer, Starck produces 50% of powdered tantalite on a world level. Dozens of companies are linked to the traffic and elaboration of this product, with participation of ...

COLUMBITE-TANTALITE {COLTAN} MINING IN NIGERIA; THE OPPORTUNITIES

Columbite, also called niobite, niobite-tantalite and columbate, is a black mineral group that is an ore of niobium and tantalum. It has a submetallic luster and a high density and is a niobate of iron and manganese, containing tantalate of iron. Columbite and tantalite are collectively known as coltan in Africa.

Crystals | Free Full-Text | Columbite–Tantalite from Northern

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 …

U-Pb isotopic dating of columbite-tantalite minerals: Development of

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 …

Columbite Tantalite: a film that fuses Congo's past and …

In full, coltan's name is columbite-tantalite, after Tantalus, the figure in Greek mythology who was condemned to a horrifying eternal torment, of the things he most desired being just out of his ...

Mineralogy and chemistry of columbite-tantalite from …

They display a wide range of composition including all types of columbite group minerals, wodginite, tapiolite and microlite. The internal texture of columbite …

A Kinetic Study of the Leaching of Iron and …

A kinetic study of the leaching of iron and manganese from powdered tantalite-columbite ore by Hydrochloric Acid (HCl) and Sulphuric Acid (H 2 SO 4) solutions has been carried out.The effects of (a) particle size …

How to pronounce columbite-tantalite

Rate the pronunciation difficulty of columbite-tantalite. 5 /5. (1 Vote) Very easy. Easy. Moderate. Difficult. Very difficult. Pronunciation of columbite-tantalite with 1 audio pronunciations.

Niobium (columbium) and tantalum resources of Brazil

Most of the niobium resources of Brazil occur as pyrochlore in carbonatites within syenitic intrusives of Late Cretaceous to early Tertiary age in western Minas Gerais and southeastern Goils. Minor amounts of it are produced together with tantalum from columbite-tantalite concentrates from pegmatites and placers adjacent to them, in the …

Zoning in columbite-tantalite crystals from the granitic pegmatites …

The columbite-tantalite specimens studied by the author are Nb- and Fe-rich and all are opaque. The 509 510, Lahti aim of this paper is to describe their zoning styles with the aid of microprobe methods, to show the compo- sitional variation and to discuss briefly the origin of zoning. ... After the microprobe determinations, a powdered sample ...

Extractive metallurgy of columbite-tantalite ore: A detailed …

Abstract. The increased demand of metals such as tantalum (Ta) and niobium (Nb) reflect the on-going development in modern science, engineering and …

Extractive metallurgy of columbite-tantalite ore: A detailed …

Commercial and innovative pyrometallurgical (direct reduction), hydrometallurgical (pure leaching) and pyro-hydrometallurgical (NH4HF2 or alkali …

Chemistry of columbite-tantalite minerals in rare metal …

Compositionally, columbite-tantalite of the Li-albite granites is constrained between MnNb 2 O 6 and MnTa 2 O 6 (the Ta/(Nb+Ta) atom. ratio ranges between 0.10 and 0.80). This low to high ratio and the association of columbite-tantalite with topaz, fluorite and lithian micas (in the series zinnwaldite-white mica) indicate a higher solubility ...