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
Low-temperature processed Tantalum/ Niobium co-doped TiO2
Here, we develop a facile low-temperature chemical bath method to prepare TiO2 ETL with Tantalum (Ta) and Niobium (Nb) co-doping. Systematic investigations indicate that Ta/Nb co-doping could increase the conduction band level of TiO2 and decrease trap state density, boosting electrons injection efficiency and reducing charge recombination ...
Selective recovery of niobium and tantalum from low-grade concentrates
Niobium and tantalum were selectively recovered from low-grade concentrates by a new hydrometallurgical process.. The process is fluoride-free and exhibits high purification factors toward Fe, Ti, Al, P, S, Na, Si, Th and U. • The developed method was successfully tested on industrial concentrates both at the lab-scale and at the pilot …
Tracking the evolution of niobium cycle in China from 2000 …
Fig. 2 (a) illustrates the cumulative niobium flows and stocks in China from 2000 to 2021. It shows that a large amount of imported niobium concentrates was separated to produce niobium oxides through a hydrometallurgical process, with a total amount of 27703 tons.
Recovery of niobium and tantalum by solvent …
Niobium has a high melting point, relatively low density, and important magnetic and superconducting properties. Tantalum has a high thermal and electrical conductivity and it is well known for its high resistance to …
Efficient Recovery of Niobium and Tantalum from …
After being decomposed by HF − H 2 SO 4 for 4 h, and then further treated with HNO 3 for 1 h, a favorable Nb recovery rate of 99.8% was successfully obtained. …
Efficient Recovery of Niobium and Tantalum from …
A stable and continuous leaching process for niobium and tantalum extraction from ferrocolumbium tantalum (FT) was developed. The efects of initial concentration of HF …
Adsorption of Niobium and Tantalum Contained in a Tin …
However, there is a paucity of information in the literature on the study of adsorption for niobium and tantalum on secondary materials. Therefore, the objective of this study was to analyze the performance of three ion exchange chelating resins in the recovery of niobium and tantalum from an acidic solution generated from the leaching …
Geology, market and supply chain of niobium and tantalum—a review
Tantalum (Ta) and niobium (Nb) are essential metals in modern society. Their use in corrosion prevention, micro-electronics, specialty alloys and high-strength low-alloy (HSLA) steel earns them a strategic designation in most industrialised countries. The Ta market is unstable due in part to historic influx of 'conflict' columbite-tantalite …
Embedded critical material flow: The case of niobium, the …
This flow diagram, including the 10-digit harmonized system (HS) codes, is representative of United States niobium flow. China's niobium flow is assumed to be equivalent to the United States, except for domestic columbite-tantalite mining and niobium produced from tin slags which are included in the China-specific niobium flow box.
Modern Tantalum and Niobium Industry in China
China is rich in tantalum and niobium resources. The tantalum and niobium resources are mostly found in 92 mine areas in 13 provinces. The total recoverable …
Efficient Recovery of Niobium and Tantalum from Ferrocolumbium Tantalum
The established method provides a promising technique for the high-efficiency separation of niobium and tantalum from FT. • The priority of metal extraction in HF‑H 2 SO 4 system is Si > Fe > Ta > Nb. • Ferrocolumbium tantalum can be stable leached by introducing raw material and acid every 20 min.
Recovery of niobium and tantalum by solvent extraction …
Niobium and tantalum are two transition metals almost always paired together in nature, with similar physical and chemical properties. Niobium has a high melting point, relatively low density, and important magnetic …
Hydrometallurgical Process for Tantalum Recovery from …
However, the tantalum used in capacitors is free of niobium. Hence, studying the recovery of tantalum from capacitors is not only beneficial for waste management, but it also avoids the disadvantages of the typical tantalum recovery process. Epoxy-coated solid electrolyte tantalum capacitors (EcSETCs) consist of …
Life Cycle Assessment of Tantalum and Niobium Recycling …
This study provides gate-to-gate life cycle inventory data on tantalum and niobium recovery from the Ta–Nb-rich residue after the leaching of cobalt in the …
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 …
A niobium company visit in Ningxia, China | ILC Newsline
OTIC is an important supply base for new materials of such rare metals as tantalum, niobium and beryllium for high-tech applications and an export-oriented high-tech enterprise in China. "I have been much impressed with the promising configuration and scale of the company, which has a highly motivated spirit for advanced technology," said ...
Factors and challenges in the recovery of niobium and …
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 …
Niobium- and Tantalum-Doped Pt-Sn/Al2 O3 as Efficient
The Pt-Sn/Al2 O3 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 a …
Sulfuric acid leaching of low-grade refractory tantalum–niobium …
The leaching efficiency of niobium and associated rare earth elements was investigated by sulfuric acid instead of hydrofluoric acid. In this study, it is clear that the Panxi tantalum–niobium and rare earths minerals of low-grade can be dissolved in sulfuric acid leaching system.
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 ...
Mineralogical Properties of a Refractory Tantalum-Niobium …
Although tantalum-niobium resources in China are very rich, the ore grade is low, with many associated impurities, which leads to separate difficultly, low recovery ratio and poor occurrence state of useful components .
Production, Properties and Application of Tantalum, …
CrNb and 3-4% high-purity niobium oxide or niobium metal which is also used as ... tantalum-niobium content is collected in the resulting ferroalloy and the tan ... Today it possesses the world's largest plant of this kind, capable treating 18 000 tpy tin slags. ...
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 tin slag, contributing to the circular economy.
Mapping the material flows and recycling potential of tantalum in China …
Stock and flow of tantalum in China were analyzed here, with its entire life cycle from 2011 to 2019, to reveal the key sectors of tantalum use and its recycling potential. Tantalum production in China was around 1000 t, …
Valuable metal recovery from waste tantalum capacitors via …
The development of tantalum capacitor (TC) industry is associated with the production of one technology metal-tantalum (Ta). The recycling of waste ta…
A review on extractive metallurgy of tantalum and niobium
The approach consists of several sequential steps involving tantalum and niobium leaching, solutions purification, precipitation, calcination and final recovery of …
Recovery of niobium and tantalum by solvent extraction from Sn–Ta–Nb
Recovery of niobium and tantalum by solvent extraction from Sn–Ta–Nb mining tailings ... The process described in this work opens a possibility to produce high quality materials that are considered critical by the EU from alternative sources exempt of …
Extraction Recovery of Tantalum(V) and Niobium(V) from
Comparative study of extraction of tantalum(V) and niobium(V) with octanol and tributyl phosphate was made. The data on distribution of tantalum(V) and niobium(V) between octanol and hydrofluoric and hydrofluoric-sulfuric acid aqueous solutions were obtained. The flowsheet for preparation of pure tantalum and niobium oxides was developed.
Process development for the separation of niobium and tantalum …
The leach liquor obtained after the digestion of C.T ore in hydrofluoric acid is subjected to solvent extraction for recovery of pure niobium and tantalum (Mirji et al., 2016). ... Transactions of Nonferrous Metals Society of China (English Edition) ... The high efficiency of gold recovery via the industrial metallurgical process is ...
Rising Demand for Niobium in Electric Vehicles and …
Demand for Lighter and Fuel-Efficient Vehicles: Niobium is also used in the automotive industry to produce lighter-weight and more fuel-efficient vehicles. As the automotive industry continues to ...
Fluoride-Free Processing of Columbite Concentrate for
Niobium and tantalum extraction industries heavily depend on uoride chemistry for metal oxide production. This study concentrates on developing a uoride-free approach utilizing alkali treatment for selective dissolution of niobium and tan-
A Kinetic Analysis of Acid Leaching of Niobium and …
Residues from rutile chlorination plants often contain relatively high concentrations of critical metals, essential for energy devices. Ironically, the conventional method of extraction of niobium and zirconium is quite energy demanding and detrimental to the...