Recovery of niobium and tantalum by solvent extraction from …
The final products of the process are niobium oxide and potassium tantalum salts. Niobium oxide has a purity of 98.5% and impurities of Ta, 1.85% as Ta 2 O 5. Tantalum salt, after calcination and purification, has a purity of 97.3% and impurities of Nb 2 O 5, around 1.6%. The limiting factor of the process is the first stripping step, above all ...
Niobium and tantalum | U.S. Geological Survey
Niobium and tantalum are transition metals that are almost always found together in nature because they have very similar physical and chemical properties. Their properties of hardness, conductivity, and resistance to corrosion largely determine their primary uses today. The leading use of niobium (about 75 percent) is in the production …
Life Cycle Assessment of Tantalum and Niobium Recycling …
Secondary hard metal contains valuable tantalum and niobium, which could be recovered after chemical recycling of the scrap; however, the environmental impacts …
Hydrometallurgical Process for Tantalum Recovery from …
The Tantalum–Niobium International Study Center (TIC) indicates that the global production of tantalum was 2800 tons in 2014, and at that time, it was sourced from 1400 tons of tantalum mineral concentrate, 370 tons of tin slag, and 990 tons of scrap, respectively . Due to recent developments, the recycling of tantalum has gradually …
Recent process developments in beneficiation and …
Its leaching efficiency for REEs is basically the same as that using (NH 4) 2 SO 4, and the leaching efficiency of aluminium impurities can be reduced. 117, 118 In a study using MgSO 4 as a leaching agent, it was found that excessive ion-exchangeable magnesium in washing tailings had a negative effect on plant growth.
Recovery of niobium and tantalum by solvent extraction from Sn–Ta–Nb
Introduction Niobium, tantalum and Rare Earth Elements (REEs) are included in the 2017 year list of the 27 critical raw materials of the European Union due to their importance for high-tech products and emerging innovations and the risk in the security of supply and economic importance (EU, 2017). 1 Up to 30% of the required energy to refine these …
Recovery of niobium and tantalum by solvent …
Recovery of niobium and tantalum by solvent extraction from Sn–Ta–Nb mining tailings† Olga Rodr´ıguez, a Francisco J. Alguacil,a Esther Escudero Baquero,a Irene Garc´ıa- D´ıaz,a Paloma Fernandez,´ b Belen Sotillo´ b and Felix A. L´ opez´ *a The slag from the extraction processes of metals from their ores may contain valuable components that, if
Niobium and tantalum
Niobium and tantalum are transition metals that are almost always found together in nature because they have very similar physical and chemical properties. Their properties of hardness, conductivity, and resistance to corrosion largely determine their primary uses today. The leading use of niobium (about 75 percent) is in the production of high …
Fluoride-Free Processing of Columbite Concentrate for …
tives include high-temperature carbochlorination (Cl 2-CO), roasting using various uxes like sodium salts (NaF-HF, Na 2 C 2 O 4-HF), and uoride ux (NH 4 NF 2) [9–12]. In the available literature, there are reports of process-ing niobium and tantalum minerals in alkali media. In an aqueous alkali solution, niobium and tantalum tend to
Efficient Recovery of Niobium and Tantalum from …
• A high Nb extraction rate of 99.8% was achieved by the continuous leaching process. Keywords Ferrocolumbium tantalum · Hydrouoric acid − sulfuric acid · Continuous …
Rare earths, niobium, tantalum: Russia-China project …
Chelyabinsk Pipe Works was granted project approval by the local government in December 2011 and planned a mine and processing plant to produce a concentrate containing 40% niobium and 4% tantalum.
Tantalum Metal Production Through High-Efficiency Electrochemical
The electro-calciothermic reduction of tantalum sulfide (TaS2) was applied to open a new pathway for producing high-purity Ta powders applicable for tantalum electrolytic capacitors. The supplied electric charge was varied to electrochemically reduce the sulfide at 900 °C using Ca in molten CaCl2−xCaS (x = 0.1, 0.5 mol%) salts. The …
Selective recovery of niobium and tantalum from low-grade concentrates
Introduction. Niobium (Nb; Z = 41) and tantalum (Ta; Z = 73) are two group V elements which remain largely unknown to the general public even if their unequaled properties make them essential for many key sectors.For example, Nb is a strategic ingredient in the manufacture of high-strength low-alloy (HSLA) steels [1]. The addition …
Development of a process for the concentration of the …
The high supply risk of critical raw materials is mainly due to the high share of the worldwide production supplied by China (antimony, fluorspar, gallium, germanium, graphite, indium, magnesium, rare earths, tungsten), Russia (platinum group metals), the Democratic Republic of Congo (cobalt, tantalum) and Brazil (niobium and tantalum ...
Factors and challenges in the recovery of niobium and tantalum …
Introduction. 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 …
A review on extractive metallurgy of tantalum and niobium
Very few detailed studies are reported on the hydrometallurgical recovery of niobium and tantalum from their minerals (Agulyanski, 2004; ... an alternative process …
Recovery of Rare Earths, Niobium, and Thorium from the …
The recovery of rare earths, niobium, and thorium from Bayan Obo's tailings has been investigated because the Bayan Obo ore is rich in rare earths and rich in niobium and thorium, but it is mined mainly as an iron ore and will be used up soon. By carbochlorination between 823 K (550 °C) and 873 K (600 °C) for 2 hours, 76 to 93 pct …
Characterization of Rayfield-Jos Columbite Deposit for Efficient …
Columbite is generally described as a low-grade complex oxide ore of majorly metal oxide compounds like niobium penta-oxide (Nb 2 O 5) of ~ 55–78% content and ~ 5–30% tantalum penta-oxide (Ta 2 O 5) as its main constituents in the ore composition with significantly associated oxide gangue minerals/elemental impurities …
Efficient Recovery of Niobium and Tantalum from Ferrocolumbium Tantalum
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 H 2 SO 4, grinding fineness, leaching time, and temperature on the leaching rate of Ta, Nb, Fe, and Si were studied. Experimental results show that the leaching rates of Ta, Nb, …
Sulfuric acid leaching of low-grade refractory tantalum–niobium …
2.1 Materials. The niobium–tantalum minerals in this study were obtained from Panxi area of China. The ore was ground in a disk grinder to −74 μm. The mineralogical composition was analyzed by mineral liberation analyzer (MLA650) automated quantitative system, and the chemical analysis of the typical ore sample is …
Modern Tantalum and Niobium Industry in China
The tantalum and niobium industry in China was established in the later years of the 1950s. In 1956, the research institutes and semi-industrial experimentation …
Niobium: The Focus on Catalytic Application in the …
1.1. Niobium: General Information. Niobium (Nb) is a chemical element with atomic number 41 and 92.90637(2) units of atomic mass [1,2] (Figure 1).It is a transition element belonging to group 5 of the periodic table of the elements, according to the IUPAC classification of the elements.
Life Cycle Assessment of Tantalum and Niobium Recycling …
Secondary hard metal contains valuable tantalum and niobium, which could be recovered after chemical recycling of the scrap; however, the environmental impacts of their recycling have not been earlier quantified. This study provides gate-to-gate life cycle inventory data on tantalum and niobium recovery from the Ta–Nb-rich residue after …
Mapping the material flows and recycling potential of tantalum in China …
Tantalum is widely used in electronic devices and is crucial for modern society; however, research on the tantalum flow in China was very limited and the scientific evidence for formulating targeted policies was insufficient. Stock and flow of tantalum in China were analyzed here, with its entire life cycle from 2011 to 2019, to reveal the key …
Niobium and tantalum recovery from the primary source …
Niobium (Nb) and Tantalum (Ta) are used to increase materials' mechanical resistance and produce lighter alloys. Worldwide Nb production reached 78 000 t in 2020. The reduced ore offer justifies the recycling of these metals from …
Recovery of niobium and tantalum by solvent extraction …
1 7.2 g L and 9.0 g L 1 of niobium and tantalum, respectively, fed the extraction operation using Cyanex 923 as extractant; the operation has high extraction e ciencies 97.7% …
A niobium company visit in Ningxia, China | ILC Newsline
On 18 February 2011, a delegation of Global Design Effort representatives visited the Orient Tantalum Industry Co. Ltd (OTIC), Ningxia, a leading niobium company in China. The group consisted of ILC project managers Akira Yamamoto and Marc Ross, together with Robert Rimmer of Thomas Jefferson Laboratory in the US, accompanied …
Niobium- and Tantalum-Doped Pt-Sn/Al2 O3 as Efficient
The Pt-Sn/Al 2 O 3 catalyst has been successfully commercialized for propane dehydrogenation, but it is still highly desirable to further improve its catalytic performance for maximizing the utilization efficiency of noble metal Pt. Herein, this work demonstrates that doping Nb and Ta into Pt-Sn/Al 2 O 3 has great impacts on its structure, and significantly …
A novel process for recovery of scandium, rare earth and niobium …
Niobium minerals and rare earth minerals were converted to acid soluble compounds.. Scandium in Sc-Fe bearing silicate was released and part of iron transformed to magnetite.. Ca-bearing impurity participate in the activating roasting of relevant minerals. • 97.6% Sc 2 O 3, 97.18% REO, 40.1% Nb 2 O 5 were leached in HCl, as 51.67% Nb 2 …