A step-wise separation process for niobium and tantalum from tantalite by extraction and ion exchange was developed. A tantalite mineral was dissolved by a fusion technique using ammonium ...

Tantalum and niobium are also known to occur in tin-bearing ore-deposits and have been concentrated and successfully extracted from the tin slags disposed as an industrial waste from cassiterite smelting processes [[8], [9], [10]]. ... they should also be removed before chemical leaching for separation of tantalum from niobium [23, 25, 26].

Reactor-grade niobium steel is used as a construction material for nuclear reactors. In this case, the presence of tantalum, which is characterized by a 20 times higher active cross section for capturing thermal neutrons than the cross section of niobium (181Ta: 21.3 barn), cannot exceed 100 ppm. Analytical methods for quality and new …

The transition metal tantalum is a hard, blue-grey element with a refectory character, high density and dielectric strength with a very low coefficient of thermal expansion (6.4 × 10 −6 [m/(m·K)] at 20 °C). Tantalum due to its specific physical and chemical properties has many technological applications, but it is indispensable as part …

A plumbomicrolite concentrate (PMC) was leached with the mixture of HF and H2SO4, HF and HNO3 acids, respectively. Optimal conditions ensuring high recovery of tantalum and niobium (up to 99%) into solution, and radionuclides into insoluble residue were determined. Fluoride-sulfuric acid and fluoride-nitric acid schemes were proposed …

A step-wise separation process for niobium and tantalum from tantalite by extraction and ion exchange was developed. A tantalite mineral was dissolved by a …

The production procedures for niobium are complex, the major problem being its separation from tantalum. Separation from tantalum, when necessary, is effected by solvent extraction in a liquid-liquid process; the niobium is then precipitated and roasted to niobium pentoxide, which is reduced to niobium powder through …

Abstract. Niobium and tantalum are valued for their uses in nuclear, steel, aviation and electronics industries. This paper elucidates the development of a …

Indeed, niobium forms NbOF 5 2 at low acidity and NbF 6 at high acidity whereas tan-talum forms TaF 7 2 at low acidity and TaF 6 at high acidity. This dif-ference in the speciation of the two metals allows their separation, so that, all the commercialized solvent extraction (SX) processes for the Nb–Ta separation are operated in fluoride ...

performed a study on the separation of niobium, tantalum, vanadium and iron in a sulfate medium solution. The technique used was ion exchange with a chelating resin synthesized with the functional group N-benzoyl-N-phenylhydroxylamine (NBPHA). pH adjustment was necessary for the adsorption of niobium and tantalum, which occurred …

These tantalum/niobium containing mineral deposits are widespread across the earth [2, 3], but many of the deposits contain small amounts of niobium and tantalum. Brazil and Australia have the largest high-grade niobium and tantalum resources and are therefore the major world producers of these metals, followed by Canada, Mozambique and Ethiopia.

The separation effectivity of tantalum from niobium fluoride complexes on MIBK-impregnated active carbon (C1) was determined in flow system studies. Solutions of …

A step-wise separation process for niobium and tantalum from tantalite by extraction and ion exchange was developed. A tantalite mineral was dissolved by a fusion technique using ammonium ...

The separation of tantalum and niobium after NH4F·HF flux dissolution was investigated using three different separation …

The separation effectivity of tantalum from niobium was also determined in dynamic studies using a fixed-bed column with MIBK-impregnated active carbon. Solutions of various Nb:Ta weight ratios (1 ...

The traditional hydrometallurgical method for the separation of tantalum or niobium as disclosed in us patent 3,117,833 is included in the inorganic acid, which is better to treat the tantalum/niobium raw material in the hydrofluoric acid/sulfuric acid mixture. Tantalum/niobium was thus dissolved together in the form of a fluorine complex ...

The separation of tantalum and niobium oxides from th e leached tantalum concent rate st arts with the fusion of the sample prior to solvent extraction and ion exchange methods. 3.3.1.

Niobium consumption has burgeoned owing to the increasing application of niobium in critical industries, including the aerospace and oil and gas industries. Conventional metallurgical technologies and separation methods for niobium extraction use highly concentrated HF, which is hazardous to both humans and the environment.

Abstract. The separation of tantalum and niobium compounds has been of interest for many years, with few new developments. Clasically separation is facillitated …

An eco-friendly process based on a TSIL was proposed for the extraction and stripping of tantalum from sulfuric acidic medium. Such system can be used as an alternative to the methyl-iso-butyl ketone (MIBK) which is the most commonly used extractant for the separation and purification of niobium and tantalum by solvent …

A ctyl-amine based continuous multistage counter-current process for niobium-tantalum separation has been developed. • Multiple numbers of HF molecules …

The separation of tantalum and niobium compounds has been of interest for many years, with few new developments. Classically separation is achieved by liquid–liquid extraction and most research focuses on optimising this process. A separation method that bypasses the need for liquid–liquid extraction is reported here.

However, for Ta, extraction efficiency is increased by a factor of 1.3 for 4-MAcPh. In addition, the MIBK solubilized completely after 6 mol∙L−1 of H2SO4 against only a loss of 0.14–4% for 4 ...

Abstract. A detailed study was made of the adsorption of titanium, zirconium, niobium, tantalum, molybdenum, and tungsten on the anion-exchange resin, De- Acidite FF, from solutions containing mixtures of two or more of hydrofluoric acid, hydrochloric acid, ammonium fluoride, and ammonium chloride, with a view to obtaining a separation …

Processing: extraction and refining. The extraction and refining of tantalum, including the separation from niobium in these various tantalum-containing mineral concentrates, is generally accomplished by treating the ores with a mixture of hydrofluoric and sulfuric acids at elevated temperatures. This causes the tantalum and niobium values to ...

The separation of a mixture of tantalum and niobium in dilute hydrofluoric media via hollow fiber sup-ported liquid membrane (HFSLM) was examined. Quaternary ammonium salt (Aliquat336) diluted in ...

Abstract On-going technological developments, especially in the field of microelectronics and communication have reflected in concomitant increase in the …

The conditions were found for separation of tantalum(V) and niobium(V) from titanium(IV), allowing recovery of 95.7 and 84.1% of tantalum and niobium fluoride complexes, respectively, in one ...

The separation of niobium and tantalum was examined by using macroporous polyacrylate polymer beads (Amberlite XAD-7) as an adsorbent in hydrofluoric acid-hydrochloric acid mixtures. The adsorption … Expand. 2. Save. Separation of niobium and tantalum from Mozambican tantalite by ammonium bifluoride digestion and octanol …

3.1 Separation of Niobium and Tantalum from Ores. ... Niobium and tantalum have high melting points, i.e. 2415 °C and 2996 °C, respectively. These two metals along with titanium, zirconium, tungsten and molybdenum are known as refractory metals, with melting points in the range of 1800–3000 °C. Some of them are used in the …