A kinetic study of the leaching of a low-grade niobium–tantalum ore …
Many leaching processes for fine particles require agitation to suspend solid. ... ion exchange technology paves the way for the obtaining of highly pure Nb and Ta compounds from low-grade sources. Herein is presented an overview of the recent literature regarding hydrometallurgical processes involving Nb and Ta ore sources, and …
A novel approach to extract Nb, Y and Ce from a niobium-bearing ore …
In this work, a novel approach of leaching valuable metals, such as niobium, yttrium and cerium, from a niobium-bearing ore of low grade by roasting KHSO4–H2SO4 system was experimentally studied. Through the work, the effects of roasting temperature, roasting time, mass ratio of agents to ore and the types of leaching agents on the …
Mineralogical factors affecting the separation behavior of Ta …
Gravity separation is the primary method used to beneficiate Ta-Nb-bearing minerals, however, it performs poorly in low-grade and fine-grained ores.
Level Measurement for Fine Ore Bins in Metal Ore Processing
Accurately measure levels in fine ore bins to supply fast-moving sifting and filtering applications
Atomic-scale environment of niobium in ore minerals as …
Abstract. The mineralogy of niobium (Nb) is characterized by multicomponent oxides such as AB2O6, A2B2O7, ABO4, and ABO3 in which Nb is incorporated in the B site. Such complex crystal-chemistry prevents their unambiguous identification in ore deposits such as hydrothermal rocks and laterites which exhibit complex and fine …
Ore genesis of the Baishawo Be-Li-Nb-Ta deposit in the
Request PDF | Ore genesis of the Baishawo Be-Li-Nb-Ta deposit in the northeast Hunan Province, south China: Evidence from geological, geochemical, and U-Pb and Re-Os geochronologic data | The ...
(PDF) Leaching of niobium and tantalum from a low-grade ore …
A new process is proposed for the leaching and recovery of niobium and tantalum from a low-grade refractory niobium–tantalum ore after adding pure Nb2O5 to adjust the niobium to tantalum ratio.
Leaching of niobium and tantalum from a low-grade ore …
A new process is proposed for the leaching and recovery of niobium and tantalum from a low-grade refractory niobium–tantalum ore after adding pure Nb 2 O 5 to adjust the niobium to tantalum ratio. The ore was roasted and decomposed with KOH then leached with water.
Extraction of niobium, yttrium, and cerium from a low-grade …
However, it is worth noting that most of the methods mentioned above are feasible only for the concentrate ore rather than low-grade minerals. In order to handle with the low-grade ores, Wang et al. proposed a process for the leaching and recovery of Nb and Ta from a low-grade ore using a KOH-roast-water leach system. Through the …
Petrogenesis of Nb–(Ta) aplo-pegmatites and fine
The Early Cretaceous (ca. 130 Ma) Nb-rich and Ta-poor Huangshan suite, South China, includes a series of medium-grained granites that contain Nb-rich mica and very low columbite contents, which are indicative of a potential Nb resource. In addition, the Huangshan suite contains fine-grained granites and aplo-pegmatites in which …
Textural Features and Chemical Evolution in Ta-Nb Oxides …
The genesis of Ta-Nb oxides in granitoid environments and, in particular, the role of deuteric fluids in Ta-Nb ore formation remain controversial.
Mica geochemistry as an indicator of magmatic
The third-stage granite samples are light grey to white in color and exhibit fine-medium grained and massive texture (Fig. 4 a). ... The CGM is the principal ore mineral hosting Ta and Nb in the granite, ... the CGM was much enriched in Nb relative to Ta to account for the preceding decrease of Nb and marked low Nb/Ta ratios of the …
Critical mineral resources of Nb, Ta, Zr, and Hf in China
Niobium (Nb) and tantalum (Ta), which are chemical twins with very similar geochemical properties, are critical mineral resources for emerging global industries.
A precise 232 Th- 208 Pb chronology of fine-grained …
We have obtained precise Th-Pb internal isochron ages on monazite and bastnaesite for the world's largest known rare earth elements (REE)-Fe-Nb ore deposit, the Bayan Obo of Inner Mongolia, China. The monazite samples, collected from the carbonate-hosted ore zone, contain extremely small amounts of uranium (less than 10 ppm) but up to 0.7% …
A precise 232Th-208Pb chronology of fine-grained …
We have obtained precise Th-Pb internal isochron ages on monazite and bastnaesite for the world's largest known rare earth elements (REE)-Fe-Nb ore deposit, the Bayan Obo of Inner Mongolia, China. The monazite samples, collected from the carbonate-hosted ore zone, contain extremely small amounts of uranium (less than 10 ppm) but up …
Ore genesis of the Baishawo Be-Li-Nb-Ta deposit in the …
The Baishawo deposit is a newly discovered large pegmatite type Be-Li-Nb-Ta deposit that located at the NE Hunan province, South China, with estimated…
Bin Design and Construction
We have designed bins to handle a variety of materials including coal, coke, iron ores and concentrates, sintered and pelletized ores, calcined and raw limestone, …
Recovery of niobium and tantalum by solvent extraction …
For Nb precipitation, better yields were obtained when the molar ratio Nb/NH3 were low, between 0.015 and 0.03. After precipitation, solids were filtered, washed with deionized …
Occurrence State and Distribution Regularity of Key Metal
It is speculated that, among the four types of iron ore, the Nb minerals have a low dispersion degree, mostly existing in the form of independent minerals, and that the content of Nb minerals is higher than the detection limit. ... and other minerals, 27 or exists in REE minerals and gangue minerals as fine Nb (Ta) mineral inclusions ...
Separation and recovery of valuable metals from low-grade REE–Nb–Fe ore
This method has been widely used in the treatment of Nb or REE-bearing ore using an alkali or acid solution. Wang et al. (2009) extracted Nb and Ta from a low-grade Nb–Ta ore by combined melting and leaching processes, even though equipment corrosion caused by alkali and requirement of a high-grade ore grade could not be …
The role of magmatic versus metasomatic processes in Ta-Nb
The exact role magmatic versus metasomatic processes play in Ta-Nb mineralization is a question that has been debatable for several decades. The Jiabusi deposit is chosen to address this question, for its ample endowments of a variety of Ta-Nb oxides and mica in the various rock types that could provide insights into the whole …
Ore Bin (Silo) Safety
Around these ore storage bins or areas there are three possible places of work, on top, under, and in. Each one has their own brands of danger, and methods of …
Geochronology and geochemistry of the granites from the Jiabusi Ta-Nb
The genesis of Ta-Nb oxides in granitoid environments and, in particular, the role of deuteric fluids in Ta-Nb ore formation remain controversial. Ta-Nb oxides in the Yichun deposit occur ...
Nb-Ta-Ti oxides fractionation in rare-metal granites
Abstract Nb-Ta-Ti-bearing oxide minerals (Nb-Ta-bear-ing rutile, columbite-group minerals) represent the most common Nb-Ta host in topaz-albite granites and related rocks from the Krásno-Horní Slavkov ore district. Tungsten-bearing columbite-(Fe), W-bearing ixiolite, wodginite and tapiolite-(Fe) are extremely rare in these rocks.
Mineral Characteristics and the Mineralization of Leptynite-Type Nb–Ta
A large Nb–Ta ore deposit was found in the Yushishan leptynite in the west Qilian Orogenic Belt (QOB). Based on a field geological survey and using a Mineral Liberation Analyser (MLA, including scanning electron microscopy (SEM) and energy-dispersive spectrometer (EDS)) methods, eight Nb minerals (fergusonite, polycrase, …
Tantalum Niobium Ore Process
The tantalum-niobium ore beneficiation separates the valuable minerals in the raw ore from impurities to obtain high-purity tantalum-niobium concentrate, which meets the requirements of industrial applications. The specific Ta-Nb ore process should be determined according to the specific nature and composition of the ore. Ore washing: To extract tantalum …
Leaching of a Low-grade Refractory Tantalum-Niobium Ore …
A new leaching process for a low-grade refractory tantalumniobium ore by KOH sub-molten salt was studied. The effects of leaching temperature, initial KOH concentration, leaching time and mass ratio of alkali to ore on the leaching rate of Nb and Ta were investigated. The results show that the leaching rates of Nb and Ta can be raised as high as 98% and …
[PDF] Leaching of niobium and tantalum from a low-grade ore …
Semantic Scholar extracted view of "Leaching of niobium and tantalum from a low-grade ore using a KOH roast-water leach system" by Wang Xiaohui et al.
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(PDF) Niobium and tantalum deposits
Map showing the global distribution of niobium and tantalum mines, deposits and major occurrences (British geologic survey, 2011). …