Tantalite is as an ore of the rare element s tantalum and niobium. NOTEWORTHY LOCALITIES Localities for Tantalite are pretty much the same as Columbite, and it often is not identified individually but more generally as Columbite-Tantalite.Web

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 …Web

We characterize columbite-tantalite minerals covering a significant range of compositional variation known for columbite-tantalite minerals and having ages between 198.3 ± 1.4 Ma to 2053.2 ± 1.3 Ma. The various minerals are chemically homogenous, and several among them may serve as reference materials for in situ U-Pb dating.Web

The CGM record ore-forming processes due to their ubiquitous occurrence in most pegmatite zones coupled with complex ... Massive and coarse grained: blocky microcline and quartz-muscovite aggregates ... irregular columbite-Mn grain, sample 14-703-8; g, oscillatory tantalite-Mn grain with columbite-Mn patch and rim, sample 366-2; h ...Web

In the ore minerals from the Madeira granite that encompassed the richest granite intrusion (facies), the main ore minerals are cassiterite (associated with zircon), columbite-tantalite, pyrochlore, and xenotime, whereas the Água Boa granite mainly includes cassiterite, columbite-tantalite, and topaz (Koury and Antonietto, 1988).Web

The chlorination of columbite-tantalite in the presence of a reducing carbon bed produces a mixture of volatile tantalum, niobium, iron, tin, aluminium and …Web

The latter is related to ore deposits of typical Nb–Ta–Sn–W metal association in the pegmatites or quartz veins . Pegmatites can be found predominantly mineralised in Sn/Nb–Ta minerals namely cassiterite and columbite-tantalite while quartz veins are found to be mineralised in Sn/W minerals including cassiterite or wolframite.Web

The Kenticha rare-element pegmatite, a globally important tantalite source in the Neoproterozoic Adola Belt of southern Ethiopia, is a highly fractionated, huge (2,000m long and up to 100m thick ...Web

The Jianfengling granite is an important ore-forming rock unit in the Xianghualing orefield in Nanling region (South China), and its magmatic evolution is vital to understand the regional niobium (Nb)-tantalum (Ta) mineralization. ... The rock has massive structure, with feldspar phenocrysts of about 1–10 mm size. The samples contain mainly ...Web

March 2006 · Surface and Coatings Technology. G. B. Kale. I.G. Sharma. In order to improve the high temperature oxidation resistance of refractory metals, multilayers Al–Si composite coatings ...Web

The principal lithium ore minerals are spodumene, petalite, and lepidolite; cesium mostly comes from pollucite; and tantalum mostly comes from columbite-tantalite. Tin ore as cassiterite and beryllium ore as beryl also occur in LCT pegmatites, as do a number of gemstones and high-value museum specimens of rare minerals.Web

The ore-samples were classified as low-grade and non-radioactive ores as they contained less than 0.1% Ta2O5 and Nb2O5, and the percentage of radioactive oxides were below the critical value of 0.5%.Web

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 series. Visit gemdat for gemological information …Web

In order to rationally develop and utilize a Ta–Nb–Li–Rb rare metal deposit in Jiangxi Province, the mineralogical characteristics of the ore, such as chemical composition, mineral composition, modes of occurrence of major elements, and dissemination characteristics of major minerals, were investigated in detail based on optical microscopy …Web

The ore minerals of albitites are Ta-Nb-bearing cassit-erite, columbite–tantalite, struverite, and uranmicro-lite. Thus, the Kester Deposit includes three types of ore-bearing rocks (according to the order of the for-mation): rare-metal granites → albitites → greisens. The greisen deposit has been explored down to a depthWeb

They are typically found together in the ore columbite-tantalite (coltan). Is coltan toxic? The massive demand for coltan – short for columbite-tantalite – has fuelled a desperate and bloody battle to seize the river beds where it can be mined. … Coltan, which is highly toxic, is also blamed for birth defects in the areaswhere it is minedWeb

carried out the comparison of the performance and decomposition of the kentichamangano-tantalite ore by both HF-H 2 SO 4 leaching and KOH fusion-leaching. The comparative study thus proposed KOH sub-molten salt as a substitute process method for the dissolution of Nb/Ta minerals with the intention of mitigating/eliminating HF acid …Web

The columbite-tantalite group minerals [(Fe,Mn)(Nb,Ta) 2 O 6 ] are critical ore minerals of niobium and tantalum in rare metal pegmatite deposit.Web

The main minerals of tantalum-niobium ores from which both are extracted are columbite ((Mn,Fe)(Ta,Nb) 2 O 6); hatchettolite (Ca,U,Ce) 2 (Nb,Ti,Ta) 2 O 6 (OH,F); …Web

Sample MD078 was analysed by 12 spots of Mn-tantalite and 3 spots on cassiterite. The upper intercept age is 2642 ± 7 Ma (Fig. 5.1d). Data from further 19 grains of cassiterite from sample MD125 yield an age of 2638 ± 8 Ma. Sample MD 131 with predominant cassiterite (12 spots) and minor Mn-tantalite (2 spots) was dated at 2639 ± …Web

Tantalite and columbite ores have been reported as containing associated primordial radionuclides, such as uranium and thorium. Ethiopia is one of the world suppliers of tantalite ore through exploitation of Kenticha mine and tantalite production by a large number of artisanal miners. For the purpose of implementing the international standards …Web

Abstract The global distribution of tantalum deposits and their resources on the geological time scale is analyzed. The analysis is based on the data for 65 deposits …Web

Commercial and innovative pyrometallurgical (direct reduction), hydrometallurgical (pure leaching) and pyro-hydrometallurgical (NH 4 HF 2 or alkali …Web

Evolution of the chemical composition of columbite–tantalite in Li–F granites and pegmatites — a comparative study ... the ore bodies are massive (e.g., Greenbushes, Australia; Melcher et al., 2016); (2) visible zoning in the lithofacies and mica contents in rare-metal granites and pegmatites (e.g., the Yashan granite and the Koktokay No ...Web

The focus here is the archaeology, history and ethnography of indigenous, artisanal, small-scale mining, primarily in southern Africa. To begin the discussion, I outline a somewhat alternative history of mining in southern Africa and highlight what amounts to a distinctive ontology of the underground world and the processing of ore to metals.Web

The flow diagram for extraction of niobium and tantalum from a columbite-tantalite ore is shown in Fig. ... special techniques must be used for purification and to convert it to massive form. In general they are similar to niobium. The methods used industrially are sintering, vacuum or inert atmosphere arc melting, and electron beam …Web

THE MINERAL TANTALITE. Chemical Formula: (Fe, Mn) (Ta, Nb) 2 O 6, Iron Manganese Tantalum Niobium Oxide. Uses: An ore of tantalum and niobium and as mineral …Web