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Coltan: The Venezuelan Regime's Smuggling of "Blue Gold"

tantalite, a metallic ore more commonly known as coltan. Thus began an unrelenting lust ... Tantalum is a strategic element, hence the high price of coltan in ... is done using very rudimentary procedures and basically involves picking up the material

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Electrostatic Separation - Mineral Technologies

Designed for the separation of titaniferous mineral sands, hard rock ilmenite and rutile, cassiterite, chromite, tantalite, wolframite and iron ore, the separator is supplied as either a 2 stage (4 Roll) or 3 stage (6 Roll) machine. Key features include: Light weight, thermally stable composite induction electrodes for high separation efficiency

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Niobium (Columbium) and Tantalum Statistics and ...

Niobium (Columbium) and Tantalum Statistics and Information. Statistics and information on the worldwide supply of, demand for, and flow of the mineral commodities niobium and tantalum. Niobium and columbium are synonymous names for the chemical element with atomic number 41; columbium was the name given in 1801, and niobium (Nb) was the name ...

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Tantalite Ore (Ta2O5 ) – NEB MINING

Because tantalum is a non-ferrous, non-magnetic metal, these implants are considered to be acceptable for patients undergoing MRI procedures. The oxide is used to make special high refractive index glass for camera lenses. We guarantee a constant supply of Tantalite ore/Coltan from the Democratic Republic of Congo.

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Tantalum Machining - espimetals.com

Tantalum Machining. Most of the procedures in working and fabricating tantalum are conventional, and can be mastered without too much difficulty. At the out set, however, two important characteristics of tantalum must be kept constantly in mind: 1. Annealed tantalum, like copper, lead, stainless steel and some other metals, is.

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Efficiency of Mineral Processing in Rwanda's Artisanal …

different operation sizes and concepts, as well as the main ore types found in Rwanda. Two of the selected mines are mining deposits of pegmatite-hosted mineralization, one producing a cassiterite concentrate (Mine 1) and the other producing a mixed cassiterite and tantalite (coltan) concentrate (Mine 2).

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Potash Breakdown of Poly-Mineralized Niobium-Tantalum ...

This ore material assaying lanthanides (RE 2 O 3 1.9%), niobium (Nb 2 O 5 1.25%) as well as titanium and zirconium (TiO 2 and ZrO 2 1.23% and 1.12%) respectively besides tantalum (Ta 2 O 5 0.13%), were used for the present work. This sample has thus been subjected to two alkali breakdown techniques using potash; namely agitation leaching and ...

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Tantalum | Plansee

Tantalum occurs naturally most frequently in the form of tantalite ore, which has the formula (Fe, Mn) [(Nb,Ta)O 3] 2. When the tantalum content predominates, the ore is referred to as tantalite. When more niobium than tantalum is present, it is known as columbite or niobite.

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Novel Technology for Chlorination of Niobium and …

A novel energy-economic and environmentally benign technological procedure for chlorination of niobium and tantalum oxides as well as their low-grade ore concentrates was elaborated. The process is based on using carbon tetrachloride or silicon tetrachloride as a chlorinating agent under pressure. It proceeds at moderate temperatures and is free from the shortcomings of …

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Assessment Of Beneficiation Routes Of Tantalite Ores From ...

The beneficiation methods for some tantalite ores from selected deposits in Nigeria have been assessed through mineralogical and compositional analyses of the ores. Tantalite ores obtained from eight different well-known locations of the mineral in the country were analyzed with 109Cd excitation source Energy Dispersive X-ray spectrometry using the emission-transmission …

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Method of obtaining tantalum-niobium from ores having a ...

Reference herein to ore is understood to include other metal carriers such as slags or residues, for example. In the invention's first process step, tin and/or iron bearing niobium-tantalum ore is melted in an electric arc furnace in the presence of aluminum, which acts as a reducing agent, and calcium oxide (CaO).

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Sample Preparation Guides - Inorganic Ventures

The most important ores are Tantalite (Mn, Fe)·(Ta, Nb) ... Metals and alloys are sampled by standard procedures. ... and allowed to solidify on the on the bottom after lining with the sodium carbonate to prevent particles of the ore from being caught in the carbonate lining and remain unfused. This is a great technique for protecting the Ni ...

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Sulfuric acid leaching of Kab Amiri niobium–tantalum ...

The chemical study of niobium and tantalum elements shows that there are large numbers of procedures for their ore decomposition. All niobium minerals can be readily decomposed with hydrofluoric acid with almost complete dissolution. This method is widely used for the dissolution of columbite–tantalite minerals (Gupta and Suri, 1994a).

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A Review of Niobium-Tantalum Separation in Hydrometallurgy

equipments [2, 3]. Tantalum was discovered by Anders Gustaf Ekeberg (1767-1813), in 1802 [1, 4]. It is a rare, hard, blue-gray, and lustrous transition metal, with the symbol Ta. ... A large number of chemical treatment procedures for the breakdown of primary sources have ... chlorination process is suitable not only for breakdown of the ore or ...

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Columbium Tantalum Flotation

Tantalite was studied most extensively because of its availability, its abundance, and its intermediate position in the columbite-tantalite mineral series. Pyrochlore was studied the least extensively for two reasons: (1) A general ore-mineral behavior pattern had been already outlined by study of the other ore minerals and (2) the amount of ...

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1 L.D. Cunningham, Columbium (Niobium) and Tantalum ...

tantalum, and the ore is imported either directly or as a concentrate. Therefore, domestic processing of columbium and tantalum may begin after the milling step shown in Exhibit 2. Tantalum and columbium are extracted from the source materials, imported concentrates, and tin slags, by digestion and liquid-liquid extraction. (Teledyne Wah Chang ...

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Novel Technology for Chlorination of Niobium and Tantalum ...

A novel energy-economic and environmentally benign technological procedure for chlorination of niobium and tantalum oxides as well as their low-grade ore concentrates was elaborated. The process is based on using carbon tetrachloride or silicon tetrachloride as a chlorinating agent under pressure. It proceeds at moderate temperatures and is free from the shortcomings of …

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Tantalum concentrates dissolution and purification method ...

The invention claimed is: 1. A method for the dissolution and purification of tantalum concentrates, comprising: (a) forming a slurry of a tantalum concentrate containing at least one member selected from the group consisting of (Fe,Mn)(Ta,Nb) 2 O 6, (Fe,Mn,Mg)(Nb,Ta) 2 O 6 (CA,An) 2 Ta 2 O 6 (O,OH,F) and NaTaO 3, a fluoride-containing compound, and sulfuric acid …

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Caustic fusion of columbite-tantalite concentrates with ...

A procedure for the production of spectrographically pure niobium and tantalum oxides from ooli.unbite-tantalite. concentrates was developed in this study. The procedure involves a caustic fusion process and the separation of tantalum and niobium by liquid-liquid extraction. The finely ground ore is fused with sodium hydroxide.

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Tantalite-(Fe): Mineral information, data and localities.

6.65 - 7.95. Crystal System: Orthorhombic. Member of: Columbite Group. Name: From ferrous iron content and the Greek mythological Tantalus, for the difficulty of dissolving the mineral. The original material with Fe>Mn was called Tantalite, subsequent name changes recognized the compositional variability of the series. Type Locality:

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Beneficiation of Niobium and Tantalum from Tantalite Ore ...

10%Ammonium bifluoride dissolution and subsequent H 2 SO 4 5-methyl-2-hexanone (MIAK) extraction proved to be the most efficient procedure for separation and isolation of a high purity tantalum oxide. The optimal conditions for Ta separation were 4.0 M H 2 SO 4 aqueous solution and organic:aqueous ratio (O/A) = 1:1.

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Minerals | Free Full-Text | A Process Mineralogy Approach ...

The historic Penouta mine in northwest Spain is the focus of efforts to extract tantalum from tin mining waste. This paper describes the characterisation of the tantalum mineralogy of waste material from the deposit. Characterisation was realised using quantitative mineralogy and geochemistry. This paper further identifies other phases of interest and …

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Corporate Policies and Procedures CONFLICT MINERALS …

Procedures CONFLICT MINERALS POLICY 1.0 Purpose . Section 1502 (the Conflict Minerals Statutory Provision) of the DoddFrank Wall Street - ... Conflict Mineral" means (1) columbite-tantalite, also known as coltan (the metal ore from which tantalum is extracted); cassiterite (the metal ore from which tin is

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Tantalite Recovery And Concentration Procedure

Tantalite Recovery And Concentration Procedure. Tantalite recovery and concentration procedure.Tantalite process and recovery beneficiation process to the invention is carried out by conventional procedure ore concentration 4 gold high recovery recovery of tantalum capacitors from waste know more investigation of dissolution kinetics of a nigerian tantalite.

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Extract Tantalum & Niobium from Pegmatites

The procedure was repeated through a roll setting of 1.6 mm and a 1.67-mm screen. The combined coarse mica from the three screens comprised 41% of the feed weight and contained 4.9% of the tantalum and 7.9% of the niobium. This lost tantalum and niobium was considered part of the mica lattice rather than unliberated material.

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Investigation of Dissolution Kinetics of A Nigerian ...

Vol.7, Investigation of Dissolution Kinetics of A Nigerian Tantalite Ore 87 3.2 Dissolution Studies 3.2.1 Effect of HNO 3 concentration The results obtained as seen in fig.2, showed that the rate of tantalite ore dissolution is affected directly by the hydrogen ion [H+] concentration.

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Tantalum Processing | TIC

Tantalum metal powder, including the precursor to capacitor grade powder, is generally produced by the sodium reduction of the potassium tantalum fluoride in a molten salt system at high temperature. The metal can also be produced by the carbon or aluminium reduction of the oxide or the hydrogen or alkaline earth reduction of tantalum chloride.

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flotation concentration of tantalite ores

Tantalite Recovery And Concentration Procedure. Tantalite recovery and concentration procedure czeu .Assessment of beneficiation routes of tantalite ncentration of about 8% in otu to about 60% in.The recovery of tantalite in nigeria dates back to the 1940.Get price and support online … Send a message to us

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Tantalum and Niobium Services - SGS

demand for tantalum has been fueled at a rate of 10% per year by the electronics industry (Roskill Information Services). Characterized by a low natural abundance, few known deposits, sporadic supply and difficult metallurgy, tantalum is a high tech metal of the future. SGS Minerals Services has contributed to many tantalum projects over the

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An investigation on hydrofluoric (HF) acid-free extraction ...

Tantalum, niobium, and their oxides are important precursor materials, essential for high-temperature alloys and electronic devices. The primary hydrometallurgical extraction technique to extract tantalum and niobium from minerals involves hydrofluoric acid (HF) digestion of the concentrates, followed by solvent extraction as an oxide separation and purification step.

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Decomposition of the Kenticha mangano-tantalite ore by HF ...

decomposition and leaching of the tantalite ore and/or the solubility of the solute to be extracted (Agulyansky, 2004; Zhu and Cheng, 2011; Nete et al., 2014). The decomposition of the concentrated Mn–tantalite may be carried out via several complicated procedures, such as alkali fusion, chlorination, reduction, and acid leaching.

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(PDF) A Review of Niobium-Tantalum Separation in ...

Tantalite ore from Mozambique was digested using molten ammonium bifluoride (NH4HF2) as an alternative to hydrofluoric acid. Niobium and tantalum …

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Coltan [Columbite-Tantalites] Ore

Coltan (short for columbite–tantalites and known industrially as tantalite) is a dull black metallic ore from which the elements niobium and tantalumare are extracted. The niobium-dominant mineral in coltan is columbite (after niobium's original American name, columbium), and the tantalum-dominant mineral is tantalite.. Columbite has the same composition and crystal …

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Tantalum mining technique –blasting, crushing ...

Tantalum is produced by the processing and refining of its ore tantalite. Tantalite is the mineral ore containing tantalum. Most tantalum mines are open pit whereas some are underground. The mining process involves blasting, crushing and transporting the tantalite ore to start the process of separating tantalum.

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Flame Atomic Absorption Spectrometry

Tantalite Ore 90 Wolframite 91 Ferro-Manganese Slags 91 Antimony Ore 92 Borax Ore 93 Chrome Ore 93 Gold Ore 94 Iron Ore 95 Rutile and Zircon Ores 96 Sulfide Ores 98 Tin Ores 99 Metallurgy 100 Carbon Steels 100 Iron Alloy 100 Ferrosilicon 103 Steels 104 Stainless Steel 105 Aluminium-Silicon Alloy 107 Copper-Beryllium Alloy 110 Brass 110

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Niobium and tantalum beneficiation from tantalite ore

The final step in this study was to investigate the possible beneficiation of the tantalite ore by combining the acid leaching with the magnetic removal and microwave dissolution of the mineral. The mineral sample which was investigated possessed minute magnetic properties and small amounts of Ta and Nb (1.79 and 1.69 % respectively) together ...

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