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The Th content removed from the mineral ore increased from 68.82% at 50°C to approximately 100% at 100°C after 3 hours of leaching in both cases. Additionally, the U content in the filtrate increased from 64.37% at 100°C to 81.27% at 150°C and finally to 90.08% at 200°C. Phosphoric acid was less effective in the removal of uranium and ...
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Mar 4, 2022Characteristic of Tantalum-niobium minerals The chemical formula of niobium-iron ore-tantalite is AB2O6, both of which are referred to as niobium-tantalum. Where A in the formula stands for iron and manganese, and B stands for niobium and tantalum. The magnetization rate of niobium-iron ore-tantalite is (22.1 to 37.2) × 10-6.
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CHARACTERIZATION OF TANTALITE ORE, NIOBIUM METAL AND OTHER NIOBIUM COMPOUNDS by Motlalepula Nete A thesis submitted in fulfillment of the requirements for the degree of Master of Science In the Faculty of Natural and Agricultural Sciences Department of Chemistry, University of the Free State Supervisor: Prof. W. Purcell
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Accordingly, the present work is concerned with a concentrated sulfuric acid leaching of the ore concentrate. Apart from zircon, leaching with sulfuric acid causes actually the dissolution of the different ore constituents in varying degrees. Rare earths, thorium and uranium are however highly leached by this acid (Krismer and Hoppe, 1984).
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We compared chemical and microbial leaching for multi-metal extraction from printed circuit boards (PCBs) and tantalum capacitor scrap. A mixed consortium of acidophiles and heterotrophic fungal strains were used in the experiments and compared to chemical leaching using specific acids (sulfuric, citric and oxalic acids).
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The amount of uranium leached increased from 69.1% at contact time of 1 hr to 88.6% when the tantalite ore was leached for 3 hrs. On the other hand, for the experiments conditions considered in this study, the leaching behavior of uranium and thorium did not change significantly with varying sulphuric acid concentration from 70 to 90 wt%.
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tantalite is an ore of tantalum and niobium and as mineral specimens. a popular ore would be columbite tantalite and the uses of that is the same as tantalum. ... What is a conjugate acid-base pair.
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Tantalite ore from Mozambique was digested using molten ammonium bifluoride (NH4HF2) as an alternative to hydrofluoric acid. Niobium and tantalum were extracted from the water-leached filtrate ...
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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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Boric Acid; Lactic Acid; Phosphorous Acid % Carbonates. Calcium Carbonate; Cobalt Carbonate; ... Tantalite, a minor metal ore with the general formula: (Fe,Mn)(Ta,Nb) 2 O 6, is a primary source of tantalum. It is often found in alluvium and hard rock pegmatite deposits. Additional Notes: Product Details CAS Product
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The beneficiation methods for Ethiopian Kenticha pegmatite-spodumene ores were assessed through mineralogical and quantitative analyses with X-ray diffraction (XRD) and energy-dispersive X-ray fluorescence (EDXRF). The tantalite in the upper zone of the Kenticha pegmatite-spodumene deposit is 58.7wt% higher than that in the inner zone. XRD analysis revealed that the upper zone is dominated ...
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tantalum niobium ore pxj sand making machine. There are two types of concrete batching plants: Ready mix plants : A ready mix plant combines all ingredients except for water at the concrete plant. This mixture is then discharged into a ready mix truck (also known as a concrete transport truck). Water is then added to the mix in the truck and ...
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Tantalite Ores Leached at 50 °C for 3 Hrs in the Presence of Concentrated H2SO4 was Found to be the most Appropriate Condition to Remove Radioactive Elements. Results Obtained from Sample A under these Conditions Indicated that 62(2)% U3O8 and 60.8(3)% ThO2 were Leached into the Acidic Solution along with 4.45 and 0.99% of Nb2O5 and Ta2O5 ...
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of niobium and tantalum from tantalite can be divided into three activities, viz., acid treatment of the ore to bring the niobium and tantalum values into solution, separation of niobium and tantalum by solvent extraction and preparation of pure niobium pentoxide and tantalum pentoxide by precipitation followed by calcination.
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separate tantalum and niobium into high-purity products. •Hydrofluoric acid is not used for decomposition of the ore •Recovery of nearly 100% the Tantalum (Ta 2 O 5) and Niobium (Nb 2 O 5) from the ore •Ability to customize the final product to Customer specifications •Significant reduction in processing costs
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The chief tantalum ores are tantalite, which also contains iron, manganese and niobium, and samarskite, which contains seven metals. Another ore which contains tantalum and niobium is pyrochlore. The main mining areas are Thailandia, Australia, Congo, Brazil, Portigal and Canada. The demand of tantalum is about 2300 tonnes a year.
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A plumbomicrolite concentrate (PMC) was leached with the mixture of HF and H 2 SO 4, HF and HNO 3 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 for PMC leaching by an extractive separation of ...
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In fact, tantalum's unusual characteristics led to its increased use in the late 20th and 21st Century. The element is extremely stable at temperatures lower than 150 degrees Celsius, and needs ...
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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 to cause an exothermic ...
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of niobium and tantalum from tantalite can be divided into three activities, viz., acid treatment of the ore to bring the niobium and tantalum values into solution, separation of niobium and tantalum by solvent extraction and preparation of pure niobium pentoxide and tantalum pentoxide by precipitation followed by calcination.
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In this study, the decomposition behavior of Ta and Nb from the mangano-tantalite ore was investigated using HF/H2SO4 mixture and KOH fusion. The effects of reaction time, decomposition temperature, acid and alkaline concentrations, and particle size on the dissolution process were examined.
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tantalite ore using sulfuric acid. The effects of variables such as acid concentration, temperature and leaching time were studied. In general, the leaching efficiency of uranium increases with increasing temperature from 100 to 300 °C whereas the opposite trend was observed for thorium. The amount of
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Indeed, until the discovery of the world's pyrochlore deposits in the 1950s, niobium was a by-product of tantalum mining, with increasing demand ensuring that it was highly valued and highly priced. All of the world's main tantalite mines are hosted in pegmatite ore bodies, including Wodgina, Greenbushes, Marropino and Bernic Lake in Canada.
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Tantalum/columbite granites are of economic interest when the columbite content of the ore ranges from 0.001% to 0.01% and the tantalite up to 0.2%. These deposits are most common in Nigeria (Africa). Because they are a low-grade ore, they do not represent significant economic value. Pegmatite deposits are the most abundant.
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Tantalum is inert to sulfuric and hydrochloric acid in all concentrations below 300°F. Attack up to 400°F is not significant and Tantalum is in common use up to 500°F. Tantalum is not attacked by nitric acid in concentrations up to 98% and temperatures up to at least 212°F. Tantalum has proven itself to be totally inert in many applications.
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Ore concentrates containing tantalum and niobium, usually decompose hydrofluoric acid (HF) ... As described above, the ore slurry, mineral acid and complexing agent are combined in the cooking pot and add water in an amount necessary to obtain a solution containing 5-40 wt.%, preferably 5-30 wt.% and most preferably 10-20 wt.% the solids. ...
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A good number of works have been reported on the hydrometallurgical leaching of iron and manganese from their ores using various leachants such as chloride media, mineral acids with or without oxidants [1-5]. Limited reports have, however, been published on the leaching of iron and manganese from tantalite-columbite ore.
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Abstract: In this study, the decomposition behavior of Ta and Nb from the mangano-tantalite ore was investigated using HF/H 2 SO 4 mixture and KOH fusion. The effects of reaction time, decomposition temperature, acid and alkaline concentrations, and particle size on the dissolution process were examined.
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Tantalum is a questionable carcinogen with experimental tumorigenic data Section 4: First Aid Measures . Material Safety Data Sheet Tantalum PT-0031 ... Do not store adjacent to acids. Section 8: Exposure Control/Personal Protection EYE PROTECTION REQUIREMENTS: Safety glasses are recommended.
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4 days agoThe price of the tantalite is very much dependent on the demand as well. The price of tantalite ore rose from about $75 per kilo in 2010 to more than $270 per kilo on 2011 and 2012. But the price has dropped since then. However, some experts point to expected growth in the electronics, aerospace, and power industry to boost the price back up.
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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 ...
Get priceDetermination of Niobium, Tantalum and Associated Elements in Niobium-Tantalum Ore by Inductively Coupled Plasma-Optical Emission Spectrometry with Open Acid Dissolution Author(s): LI Zhi-wei, ZHAO Xiao-liang, LI ...
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Tantalum is manufactured and purified using a multi-step chemical process. Ore extraction (tantalite, microlite, wodginite) or recycling. Digestion with sulfuric acid at high temperature. Solvent extraction of tantalum-containing species. Conversion to tantalum fluoride or tantalum oxide. Reduction to tantalum powder.
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acids, and a good conductor of heat and electricity. Tantalum is also characterized by high melting and boiling points of 2,996 degrees Celsius (°C) and 5,425°C, respectively. The abundance of tantalum in the Earth's crust is 0.7 parts per million. Tantalum does not occur naturally as a free metal; however,
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Properties. Tantalum and niobium are both high-melting metals with melting points of 2996℃ and 2468℃ respectively. Tantalum and niobium have very stable chemical properties, not only insoluble in nitric acid, and hydrochloric acid, but also insoluble in aqua regia. Tantalum is malleable and can be pulled into strands thinner than human hair ...
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About Tantalite Hide. Formula: (Mn,Fe) (Ta,Nb)2O6. An obsolete group name for minerals with the general formula (Mn,Fe) (Ta,Nb) 2 O 6, equivalent to the Tantalite- (Fe)-Tantalite- (Mn) Series. Generally mangan-dominant members are more abundant in nature. Many specimens called tantalite actually belong to the columbite series or tapiolite ...
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chemical leaching of a Nigerian tantalite ore. The dissolution kinetics of the ore is also evaluated. No reported works vis-à-vis, leaching a Nigerian tantalite ore with nitric acid is available. This work is inscribed within the programme being undertaken on the dissolution kinetics of tantalum in different aqueous media [8]. 2.0 EXPERIMENTAL
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ore is columbo tantalite, the source of the strategic coltan. In this work the raw material (slag) has been treated by acid leaching, using HF/H 2SO 4 as the leaching agent. Then liquid-liquid extraction of Nb and Ta was performed, with Cyanex®923 extractant, so that both metals were obtained separately. Then
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Tantalum is one of the most unreactive metals. At room temperature, it reacts only with fluorine gas and certain fluorine compounds. Fluorine, a non-metal, is the most active element. At higher temperatures, tantalum becomes more active. Above about 150 ° C (300 ° F), it reacts with acids and alkalis.
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Jun 13, 2022Tantalite: Eco-unfriendliness of HF acid: XRD, XRF, ICP-OES: Microwave assisted H 2 SO 4 & Li 2 B 4 O 7 flux fusion: Berhe et al. Mangano-tantalite: Low-grade/ore complexity, high volatility, toxicity & eco issues of F-in fluoride media digestions: XRD, XRF, FT-IR: GC + MS + HF-H 2 SO 4 leaching/ KOH fusion-H 2 O leaching: Berhe et al. Tantalite
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