Tantalum and niobium are frequently found together in nature and are simultaneously extracted from a variety of minerals (Roskill Information 10th ed., 2005a). ... Hydrometallurgy, Volume 189, 2019, Article 105107. Cyril Micheau, …, …
The most impressive result was obtaining 70 mL of high purity niobium solution of tantalum content 0.027 ppm (in relation to Nb) with 88.4% yield of niobium from a solution of …
Oxalate-based aqueous media represent one of the rare options for solubilizing weighable amounts of niobium (Nb) and tantalum (Ta) without using toxic fluoride-based mixtures. Recent progress in the hydrometallurgy of Nb and Ta also highlighted the potential of oxalate-nitrate media for the separation of Nb and Ta.
The separation of tantalum and niobium after NH4F·HF flux dissolution was investigated using three different separation methods, namely selective precipitation, solvent …
Introduction. At present, most ores containing niobium and tantalum are decomposed by concentrated hydrofluoric acid. However, such an approach is only appropriate for high-grade niobium–tantalum ore, and special containers are required due to the remarkable corrosiveness of hydrofluoric acid (HF) (Miller, 1959, El-Hussaini, 2001, He et al., 1998a, …
DOI: 10.1016/J.HYDROMET.2015.05.006 Corpus ID: 100813526; Extraction of niobium and tantalum from ferrocolumbite by hydrofluoric acid pressure leaching @article{Rodriguez2015ExtractionON, title={Extraction of niobium and tantalum from ferrocolumbite by hydrofluoric acid pressure leaching}, author={Mario Humberto Rodriguez …
Niobium and tantalum primary minerals are naturally occurring complex oxide ores, majorly of low grade deposits with chemical content of mainly Nb 2 /Ta 2 O 5 and oxides of Fe, …
DOI: 10.1016/J.HYDROMET.2014.06.006 Corpus ID: 93602526; Separation and isolation of tantalum and niobium from tantalite using solvent extraction and ion exchange @article{Nete2014SeparationAI, title={Separation and isolation of tantalum and niobium from tantalite using solvent extraction and ion exchange}, author={M. Nete and Walter Purcell …
DOI: 10.1016/J.HYDROMET.2017.08.018 Corpus ID: 103996742; Non-fluoride dissolution of tantalum and niobium oxides and their separation using ion exchange @article{Nete2017NonfluorideDO, title={Non-fluoride dissolution of tantalum and niobium oxides and their separation using ion exchange}, author={M. Nete and Walter Purcell and Johannes …
Hydrometallurgy. Volume 64, Issue 3, June 2002, Pages 219-229. ... The determination of niobium, tantalum, total rare earth elements, titanium, thorium and uranium in solution were carried out using a UV–VIS spectrophotometer (Shimadzu UV-160A). The values of total iron and zirconium were obtained by Atomic Absorption Spectrophotometer ...
For many years, the separation of tantalum from niobium involved the fractional crystallization of potassium heptafluorotantalate away from potassium oxypentafluoroniobate monohydrate, this method has been supplanted by solvent extraction from fluoride-containing solutions by the use of solvent extractants such as Octanol, bis(2-ethylhexyl ...
A stable and continuous leaching process for niobium and tantalum extraction from ferrocolumbium tantalum (FT) was developed. The effects of initial concentration of HF and …
DOI: 10.4236/JMMCE.2011.103016 Corpus ID: 7541160; A Review of Niobium-Tantalum Separation in Hydrometallurgy @article{Ayanda2011ARO, title={A Review of Niobium-Tantalum Separation in Hydrometallurgy}, author={Olushola S. Ayanda and F. A. Adekola}, journal={Journal of Minerals and Materials Characterization and Engineering}, year={2011}, …
The separation of niobium and tantalum was examined by using macroporous polyacrylate polymer beads (Amberlite XAD-7) as an adsorbent in hydrofluoric acid …
The problem is that niobium and tantalum have similar chemical characteristics, which makes refinement difficult. However, the tantalum used in capacitors is free of niobium. ... Zhu Z.W., Chu Y.C. Solvent extraction technology for the separation and purification of niobium and tantalum: A review. Hydrometallurgy. 2011; 107:1–12. doi: 10.1016 ...
Tantalum(V) and niobium(V) can be extracted into the TBP phase either at high or low HF acidity. During extraction, HNbF 6.3TBP and HTaF 6.3TBP complexes are generally …
Semantic Scholar extracted view of "Solubility of niobium(V) and tantalum(V) under mild alkaline conditions" by G. Deblonde et al. Skip to search form Skip to main content Skip to ... {Gauthier J.-P. Deblonde and Alexandre Chagnes and Sarah B{'e}lair and G{'e}rard Cote}, journal={Hydrometallurgy}, year={2015}, volume={156}, pages={99-106 ...
Certain pyrometallurgical approaches for niobium (Nb) and tantalum (Ta) extraction have been studied and investigated by several researchers. For instance, the conventional reduction of Nb mineral or Nb2O5 to Nb metal has …
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. ... Hydrometallurgy, Volume 201, 2021, Article 105358. Sun-Chol Li, …, Chol-Jin Kang.
The increased demand of metals such as tantalum (Ta) and niobium (Nb) reflect the on-going development in modern science, engineering and technology. ... Hydrometallurgy, Volume 175, 2018, pp. 348-353. Xiuli Yang, …, Hui Ouyang. Solubility of niobium(V) and tantalum(V) under mild alkaline conditions.
Hydrometallurgy, 2014, 149: 31âˆ'40. [111] SHIKIKA A, SETHURAJAN M, MUVUNDJA F, MUGUMAODERHA M, GAYDARDZHIEV S. A review on extractive metallurgy of tantalum and niobium [J]. Hydrometallurgy, 2020, 198: 105496. [112] KIM B S, CHOI Y Y. Kinetics of the chlorination reaction of tantalum pentoxide with carbon tetrachloride gas [J].
Niobium and tantalum primary minerals are naturally occurring complex oxide ores, majorly of low grade deposits with chemical content of mainly Nb 2 /Ta 2 O 5 and oxides of Fe, Mn, Sn, Ti and other metal oxides. Over the decades, researchers have extensively and consistently investigated the extraction and recovery of Nb and Ta from primary mineral …
Like other economical metals, tantalum (Ta) and niobium (Nb) are broadly used in electronic and other high-tech industries.1‒4 TaNb concentrates are mainly composed of columbotabatlite (Fe,Mn) (Ta,Nb)2O6 and other classes of mineral. 1‒7 Ethiopia has world class tantalite deposits, which are found only in some countries of the world such as Australia, …
The hydrometallurgical methods are commonly employed to recover both Ta and Nb from colombo-tantalite (Ungerer et al., 2014). The approach consists of several sequential …
Journal of Sustainable Metallurgy. 2022. Current industrial processes of tantalum (Ta) and niobium (Nb) extraction from primary resources rely in majority on hydrofluoric (HF) …
A review of niobium-tantalum separation in Hydrometallurgy. Journal of Minerals & Materials Characterization & Engineering. 2011; 10:245-256. . The physico-chemical properties of niobium are similar to tantalum, implying an occurrence together in nature, so …
Niobium and tantalum are chemically similar and are associated with each other in nature which makes it very difficult to separate. For many years, the separation of tantalum from niobium involved the fractional crystallization of potassium heptafluorotantalate away from potassium oxypentafluoroniobate monohydrate, this method has been supplanted by solvent …
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 ...
Highlights Tantalite ore was digested using molten ammonium bifluoride. Niobium and tantalum were extracted using octanol as extractant. Addition of H 2 SO 4 improves the separation of niobium and tantalum. Extraction with 2-octanol is almost similar to extraction with 1-octanol. Two and three stages were sufficient for the extraction of Ta and Nb respectively.
A Review of Niobium-Tantalum Separation in Hydrometallurgy Olushola S. Ayanda1* and Folahan A. Adekola2 1Department of Chemistry, Faculty of Applied Sciences, ... Vol.10, No.3 A Review of Niobium-Tantalum Separation 249 3.2 Newer Processes of Extraction and Separation of Niobium and Tantalum A scheme of a proposed model by Amuda et al. [25] is ...
The recovery of niobium and tantalum from alkaline solutions has been investigated. We showed that, instead of neutralizing the Nb and Ta solutions by mineral acids, calcium-bearing reagents can be used to quantitatively precipitate Nb and Ta. ... Hydrometallurgy, 156 (2015), pp. 99-106, 10.1016/j.hydromet.2015.05.015. View PDF View …
The mineralogical studies on Black mica raw material revealed the presence of notable high radioactive minerals such as uranium minerals (Soddyite, Uranophane, Uranothorite, and Ishikawaite), niobium - tantalum minerals (Columbite and Plumbopyrochlore), and rare earth elements minerals (Allanite, Xenotime, and monazite).
The Niobium, tantalum, and rare earth elements minerals have been identified as the main refractory minerals. Thus, sever condition must be used in the leaching process of them. So, we planned to use low cost agent for dissolution in one step three valuable metals. ... Hydrometallurgy, 64 (3) (2002), pp. 219-229, 10.1016/S0304-386X(02)00045-2.
The results showed that the tantalum extraction rate and tantalum and niobium separation factors were above 94% and 200, respectively, and the purity of potassium fluotantalate met the ...
