Investigations based on drilling of this granite began in the 1990s (Huang, 1999, Liu et al., 2010, Zhou et al., 2006). In the Songshugang granite, complex intergrowths of columbite–tantalite, Ta-rich cassiterite, ferberite, and Hf-rich zircon imply multiple stages of crystallization in magmatic–hydrothermal environments.

An investigation was therefore launched to evaluate alternative separation options. As part of this endeavour it was necessary to investigate accurate quantification methods to be able to trace the elements during any proposed process. ... Columbite-tantalite (coltan) refers to a solid solution series, which is formed between two different ...

Commercial and innovative pyrometallurgical (direct reduction), hydrometallurgical (pure leaching) and pyro-hydrometallurgical (NH 4 HF 2 or alkali fusion followed by leaching) technologies for the purification and separation of Ta and Nb from columbite-tantalite ore are reviewed in this paper.

Since most of these pegmatites are soil covered, further investigations are needed to trace continuity of mineralisation. Li minerals noted are spodumene (lithium aluminum silicate) and lepidolite. ... Columbite-tantalite from pegmatite of Umedpur area is also radioactive due to U and Th, and contains 3.99 wt% Y 2 O 3 and 0.1 wt% Ce 2 O 3 ...

The columbite-tantalite from Gatumba pegmatite, ... Field investigations consisted of measuring the orientation, foliation, crenulation lineation, and sample collection. The mineral textures were investigated through petrography, and also using back scattered electron (BSE). ...

Columbite- (Fe) is a post-magmatic accessory mineral occurring within syenogranites and greisens from the Desemborque Pluton. The petrographic (SEM) and geochemical (EPMA and LA-ICPMS) examination of this mineral shows two distinct textural types within both the rocks, named columbite-1 and columbite-2.

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. The more common one is the manganese rich type which is called manganotantalite or less commonly, the iron rich variety called ferrotantalite.

Tantalite and columbite ores have been reported as containing associated primordial radionuclides, such as uranium and thorium. ... This investigation, encompassing external radiation dose measurements, radionuclide analyses, and estimation of effective dose for workers at Kenticha mine, is the first environmental radioactivity …

Smith, S.R., Foster, G.L., Romer, R.L., Tindle, A.G., Kelley, S.P., Noble, S.R., Horstood, M. and Breaks, F.W. (2004) U-Pb columbite-tantalite chronology of rare-element pegmatites using TIMS and Laser …

The only contact angle observed was a marginal 36 degrees at pH 8 on columbite. The majority of the investigation of quaternary collectors was with stearyl dimethylbenzyl ammonium chloride. At 2.5 mg …

Mineral investigation exercises are ... Processes have been developed for solvent extraction of Ta and Nb pure compounds as the result of processing tantalite and columbite and a more depleted ...

experimental investigation of the solubility of synthetic columbite ( MnNb 2 O 6 ... columbite and tantalite increase dramatically with increasing melt alkalinity; for instance, at 800°C and ...

Columbite-tantalite is a solid solution whose chemical composition varies by the substitution and coexistence of niobium, tantalum, manganese, and iron, in ore structures between pure columbite ...

Members of the columbite–tantalite solid-solution series are a major mineral resource of Nb and Ta, and have the formula, ... The major-element compositions of these columbite grains were determined in the present investigation. All of the separated columbite grains from each of the samples are columbite-(Mn).

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). ... Investigation of the run products.

The dependence of columbite–tantalite (Nb 2 O 5 -59 wt. %, Ta 2 O 5 -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).

The Pakeagama Lake Pegmatite: Continued Field and Laboratory Investigation of Highly Evolved, Complex-Type, Petalite-Subtype Rare-Element Mineralization in the Berens River-Sachigo Subprovince Boundary Zone ... Tong Pan, Jie Han, Hongliang Cao, Yan Tang, and Liangliang Zhang. (2023) "Age and Composition of Columbite-Tantalite Group Minerals …

1. Introduction. Columbite-tantalite (coltan) refers to a solid solution series, which is formed between two different minerals, namely columbite and tantalite with columbite the niobium-rich group member and tantalite the tantalum-rich member (Beurlen et al., 2008).The international Mineralogical Association (IMA) refined the general …

Columbite is the main Nb-oxide in the orthorhombic columbite-tantalite group minerals (CGM) with the general formula AB 2 O 6, where Fe 2+ or Mn 2+ occupies the A-site, ... (Nb, Ta)2O6, in granitoid and alkaline melts at 650–850 °C and 30–400 MPa: An experimental investigation. Geochem. Int. 2010, 48, 456–464.

The article gives a report on integrated experimental research into targeted change of chemical and phase composition of surface and increase in contrast of physicochemical, electrical and electrochemical properties of tantalite, columbite and zircon under treatment by acid product of water electrolysis—anolyte (pH < 5) and by …

geochemical signature of columbite-tantalite and environmental impact of radioactive pegmatite mining in the parelhas region, rio grande do norte, northeast brazil Isabel Ludka Julio Mendes This article comprises geochemical, structural and radiometric investigations on radioactive pegmatites of the Borborema Pegmatitic Province in Northeast ...

Another strategic mineral mined in the DRC is coltan – a name derived from "columbite-tantalite". In 2021, the DRC's coltan production amounted to an estimated 700 tonnes, ...

Columbite-tantalite Hydrometallurgy Pyrometallurgy NH4HF2 HF 1. Introduction Niobium (Nb) and tantalum (Ta) are strategically important industrial materials due to their resistance to corrosion, conductivity and hardness.

used in capacitors as platinum substitute. Columbite, tantalite, columbite-tantalite (Coltan), pyrochlore, and euxenite constitute the major primary sources for niobium and tantalum and are located in Canada, Brazil, Nigeria, Zaire and Russia [5, 6]. These interesting elements are chemically similar and are associated with each other in nature.

Fourteen columbite–tantalite samples were analyzed from three pegmatite fields in North America that formed widely separated in space and time: the Starrett pegmatite of central Maine; the BeeBee/Pack Rat pegmatite in southern California; and the Moose pegmatite from the Northwest Territories, Canada.

Extractive metallurgy of columbite-tantalite ore: A detailed review. Dilip K Rajak, Rian Jordaan, Alba Gómez-Arias, Walter Purcell. Article 107917 View PDF. Article preview. ... Electrochemical and XPS investigations on the galvanic interaction between pentlandite and pyrrhotite in collectorless flotation system. Dezhi Liu, Guofan Zhang ...

Columbite-(Fe) in tabular crystal from the Nine Mile pluton near Wausau in Marathon County, Wisconsin. Scanning electron microscope image. (Photo by Al Falster.) 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 granitic pegmatites. …

A highly sensitive method for extractive spectrophotometric determination of titanium in silicate rocks is described. Titanium in the range 0-10 microg as TiO2 is extracted into benzene or toluene by the formation of a ternary complex of the metal with thiocyanate (SCN-) and cetyltrimethylammonium bromide (CTA) in the ratio 1:2:2.

Columbite-Tantalite : Ferrocolumbite - Renamed to Columbite-(Fe) by Mineralogical Record, v39 (2008), p 131 ... Pistorino M, Domeneghetti M C, Physics and Chemistry of Minerals, 30 (2003) p.590-598, High-temperature X-ray investigation of natural columbites, Note: sample BRA3 at T = 600 C, Locality: San Jose de Safira, Minas Gerais, Brazil ...

However, columbite-tantalite occurs in many areas of Central Africa, with some 60% of the world's Ta ore reserves located in the eastern portion of Democratic Republic of Congo (DRC) and adjacent areas. ... Following the current on-going technical (R&D) investigation, the research team proposes a 6 month Engineering and Demonstration effort ...