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.
Coltan and conflict in the DRC
The eastern part of the Democratic Republic of Congo (DRC) is extremely rich in Coltan (Columbite-Tantalite), a rare metallic ore used for the production of electronic goods of mass consumption ...
ABOUT TANTALITE-COLUMBITE MINERAL SEPARATION
International Manager at Gongyi Forui Mining Machinery Factory ... Gravity separation is the main way to beneficiate columbite-tantalite ore while sometimes combination of gravity separation ...
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 …
Columbite
Columbite. Columbite, also called niobite, niobite-tantalite and columbate [ (Fe, Mn) (Nb, Ta) 2 O 6 ], 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. This mineral group was first found at Haddam, Middlesex ...
Mineralogy and chemistry of columbite-tantalite …
open access. Highlights. •. The first such detailed microchemical characterisation of Ta-Nb oxides form Central Africa region. •. New regional magma …
Chemistry of columbite-tantalite minerals in rare …
The columbite-tantalite commonly exhibits a mottled or patchy zoned texture with the rims consistently higher in Ta than the cores, reflecting the later effect of a …
Reduction of Transition-Metal Columbite-Tantalite …
Abstract. We successfully report a liquid–liquid chemical reduction and hydrothermal synthesis of a highly stable columbite-tantalite electrocatalyst with remarkable …
Columbite-tantalite mineral chemistry from rare-element …
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 to …
Effects of columbite/tantalite (COLTAN) mining activities …
The mining of columbite/tantalite (COLTAN) has a negative effect on the different spheres of the environment notably; hydrosphere, lithosphere, and the atmosphere (Eisler 2004). Just like gold mining, COLTAN extraction involves the breaking of crystallographic bond in the mineral ore to get the products in the pure form.
(PDF) Ultrastructure of a Columbite-Tantalite Mineral from …
Here, a nanoscale study of the columbite-tantalite mineral in the Zhaojinggou Nb-Ta deposit in North China Craton elucidated its formation mechanism and the role of fluids in Nb-Ta mineralization.
Towards sustainable processing of columbite group …
In the context of engineering a novel technique for the extraction of niobium-tantalum oxides from columbite-tantalite minerals, we have reviewed the importance of dielectric properties of these ...
In situ U–Pb isotopic dating of columbite–tantalite by LA–ICP–MS
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 ...
U-Pb isotopic dating of columbite-tantalite minerals: Development of
The columbite-tantalite group minerals [(Fe,Mn)(Nb,Ta) 2 O 6 ] are critical ore minerals of niobium and tantalum in rare metal pegmatite deposit.
Metallographic and in situ compositional study on columbite–tantalite
Three points in columbite–tantalite, two in ixiolite–wodginite and three in microlite were analysed using a Hyperprobe Jeol-8500F electron microprobe, equipped with one energy dispersive (EDS) and five wave-length dispersive (WDS) spectrometers, operating at 15 kV accelerating voltage and 20 nA beam current, at the National …
Towards sustainable processing of columbite group …
Scientific Reports - Towards sustainable processing of columbite group minerals: elucidating the relation between dielectric properties and physico-chemical …
columbite tantalite gongyi
Wolfram is a typomorfic impurity in columbite–tantalite of the Kester Deposit, WO 3 is 1.77%, on average (apfu is 0.03). In tantalite- (Mn), WO 3 is 0.70%, while in columbite- (Fe), WO 3 is 2.67%, reaching 7.12%. The wolfram impurity is more typical for columbite, whereas the tin impurity is typomorphic for tantalite: the average content …
Columbite | Geology Page
Columbite has the same composition and crystal symmetry (orthorhombic) as tantalite. In fact, the two are often grouped together as a semi-singular mineral series called columbite-tantalite or coltan in many mineral guides. However, tantalite has a much greater specific gravity than columbite, more than 8.0 compared to columbite's 5.2.
Mineral chemistry of columbite–tantalite from
Columbite-group minerals occur in all main parageneses of the pegmatites and form four generations, reflecting the sequence of pegmatite formation. These …
Columbotantalite (cbt/coltan) | SpringerLink
The generic term columbotantalite, cbt, comprises the different compositional varieties of columbite and tantalite, classically treated (e.g. Ramdohr 1980) as an isomorphic, continuous solid solution series between the members (Fe, Mn)Nb 2 O 6 (niobite, now columbite, cb) and (Fe, Mn)Ta 2 O 6 (tantalite, tan), a series also known …
Columbite–Tantalite of the Kester Deposit (Eastern …
Abstract. Three mineral types of the columbite group have been revealed at the Kester Deposit (Eastern Yakutia), that is, columbite- (Fe), columbite- (Mn) and …
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.
Coltan | Earth Sciences Museum
Kathy Feick. Coltan is short for columbite-tantalite, a dull metallic ore. When refined, coltan becomes a heat resistant powder, metallic tantalum, which has unique properties for storing electrical charge. Coltan occurs in granitic pegmatites, pockets where the deep seated molten rock crystallized last. Pegmatites contain many rare metals, as ...
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 …
Mineralogy and chemistry of columbite-tantalite from …
The patchy zoning is the most common texture of CGM in the Bugarura-Kuluti. It is often produced when columbite-tantalite is subjected to an alteration by later fluids (Tindle and Breaks, 2000). Usually, an early columbite generation is replaced (or partially replaced) by a later columbite-tantalite generation richer in Ta (Fig. 8 a–c).
Tantalite: The mineral columbite-tantalite information and …
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 minerals containing the rare element tantalum. The name Tantalite has been discredited by the IMA, with the more specific designations of Tantalite- (Fe) (also …
Reduction of Transition-Metal Columbite-Tantalite as a …
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 oxygen evolution reaction (OER) performance in acidic media. The reduced Fe0.79Mn0.21Nb0.16Ta0.84O6 (CTr) electrocatalyst shows a low overpotential …
Extractive metallurgy of columbite-tantalite ore: A …
Commercial and innovative pyrometallurgical (direct reduction), hydrometallurgical (pure leaching) and pyro-hydrometallurgical (NH 4 HF 2 or alkali …
Tantalite: The mineral columbite-tantalite information and …
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 …
(PDF) MAJOR-ELEMENT GEOCHEMISTRY OF SOME PEGMATITIC COLUMBITE
Columbite-tantalite is also valued for its uranium content. This paper has seven objectives: First, to present wavelength-dispersive x-ray. fluorescence spectrometric data on the Nb O, TaO, FeO ...