This review includes evaluation of different ore concentrations, such as the extensive study of Nb mineral separations and flotation; as well as hydrometallurgical …
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•Niobium can be extracted from its ore by alkali potash solution without the presence of HF fumes. •Further investigation is needed to implement this process on commercial scale.
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The pyrometallurgical methods of the recovery of various critical metals have been established. 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 been conducted over the decades. Albeit, …
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However, mining of niobium from this ore has not yet been established industrially due to its extremely low niobium content and complex mineral properties. In this study, an efficient pre ...
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This study reports the extraction of niobium. The growing demand for niobium pentoxide, based on its use in separation processes, established its prominent significance as a leading candidate in the field of separation science and technology. ... Experimental and statistical study for leaching of niobium pentoxide from Pakistani ore. SADIA ...
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Summary This chapter contains sections titled: Sources of Niobium Niobium Ore Extraction Breakdown Chemical Treatment of the Ores Niobium and tantalum separation Reduction of niobium Purification P...
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The Earth has been bountiful with its niobium, concentrating it in ore deposits, 300 (Niobec) to 1200 (AraxB) times its crustal abundance. Few other ore deposits have been so concentrated …
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This review paper discusses the extraction processes of niobium and tantalum, encompassing hydrometallurgical, pyrometallurgical and electrometallurgical methods. The hydrometallurgical approach discussed includes ore preparation, leaching, solvent extraction, solid–liquid separation, fractional crystallisation and precipitation. The pyrometallurgical …
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On-going technological developments, especially in the field of microelectronics and communication have reflected in concomitant increase in the demand for strategic metals such as tantalum (Ta) and niobium (Nb). The extraction of these two metals from ore deposits and secondary resources is based on the generic extractive metallurgical techniques known from …
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This study reports the extraction of niobium pentoxide from pyrochlore ore occurring in Sillai Patai, KPK, Pakistan. It is difficult to recover niobium pentoxide from Pakistani ore due to its low ...
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The extraction processes were compared on the basis of ore type, solvent used, leaching temperature and percentage recovery of Niobium while for extractants the properties such as selectivity ...
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Niobium metal is produced by the aluminothermic reduction of the oxide followed by electron beam refining. Niobium powders can be produced by the reduction of potassium niobium heptafluoride (K 2 NbF 7) with sodium, or by the reduction …
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Abstract. 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, Fe, …
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In this paper, a review of the many technologies for niobium production will be presented starting at the mine, through techniques of niobium ore beneficiation and refining, technologies to...
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Keywords: Niobium; Tantalum; Rare earth elements; Leaching; Liquid-liquid extraction 1. INTRODUCTION A relatively zircon – euxenite – rich variety of the multiple oxide ore has lately been discovered at central Eastern Desert of Egypt. The identified ore minerals include mainly zircon beside euxenite, betafite and thorite.
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The extraction of niobium and tantalum from two tantalum-niobium ore materials obtained from Mozambique, using a combination of magnetic separation, acid leaching, solvent extraction and ion ...
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Nguyen and Lee [29] also performed tantalum and niobium extraction from low-grade tantalum and niobium ores by alkali decomposition and low-acid leaching. Adekola [30] proposed the leaching of ...
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The extraction of weathered ore, containing between 2.5 and 3.0% Nb2O5, is carried out through simple open-pit mining, without the need for drilling and explosives. Roughly 85 to 90% of the …
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Bayan Obo is the second largest niobium deposit in the world, and has been developed and utilized as iron ore for a long time because of its low niobium content and complex mineral composition. During the high-temperature reduction process, the recovery rate of niobium is low, and most niobium cannot be effectively recovered and utilized. Therefore, a new …
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Other authors investigated the recovery of niobium and tantalum from ore by using highly concentrated caustic potash as an alternative to hydrofluoric acid and they concluded that almost complete extraction of both niobium and tantalum is achieved at temperatures above 300 °C (Wang et al., 2009, Zhou et al., 2005).
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The present paper discusses methods for breaking down tantalum-niobium ores and synthetic tantalum-niobium concentrates and for separating tantalum ... production of niobium and its compounds. In 1980 the world's tantalum consumption (tantalum metal ... separation process by liquid-liquid extraction. Niobium is precipitated by means of NH as ...
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The extraction processes were compared on the basis of ore type, solvent used, leaching temperature and percentage recovery of Niobium while for extractants the properties such as selectivity ...
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In this paper, a review of the many technologies for niobium production will be presented starting at the mine, through techniques of niobium ore beneficiation and refining, technologies to ...
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This review paper discusses the extraction processes of niobium and tantalum, encompassing hydrometallurgical, pyrometallurgical and electrometallurgical methods. The hydrometallurgical approach discussed includes ore preparation, leaching, solvent extraction, solid–liquid separation, fractional crystallisation and precipitation.
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The extraction of Niobium through different extraction processes is reviewed in this paper. On the commercial scale the solvent extractants have been employed for the extraction of Niobium in the presence of hydrogen fluoride. But the emission of HF enhances the environmental impacts. In HF processes a proper disposal area is required for the production of huge amount …
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The extraction of weathered ore, containing between 2.5 and 3.0% Nb2O5, is carried out through simple open-pit mining, without the need for drilling and explosives. Roughly 85 to 90% of the niobium industry obtains its niobium ores from sources unrelated to the mining of tantalum-containing ores.
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A novel process of extracting niobium, yttrium, and cerium from a low-grade niobium-bearing ore by the roasting (NH4)2SO4-Na2SO4-H2SO4 system was experimentally studied. The influences of various factors, such as roasting temperature, roasting time, mass ratio of agents-to-ore and particle size fraction on the extraction of valuable metals were …
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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.
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The Niobium extraction processes are classified as direct leaching processes and hydrometallurgical processes. Different solvents which are used for extraction of Niobium in hydrometallurgical processes are compared and their properties …
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A number of industrial and technology sectors have been paying attention to a particular chemical element in recent years, namely niobium (Nb). There are many niobium deposits scattered around the world, and for each deposit different technologies are applied for extraction and processing due to the singular characteristics present at each site. In this paper, a review of the many …
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