High-temperature beneficiation of a tantalum-niobium concentrate by selective ferroalloying

Abstract A low-grade concentrate from the Crevier Township, Quebec, containing 1.8% Ta2O5 and 13.7% Nb2O5 was reduced with carbon at 1600"C, and niobium and tantalum were selectively absorbed in liquid iron. To slag off the zirconia-rich gangue, some silica and lime were added as flux. Metallic iron was added in such a way that the combined contents of TaC and NbC did not exceed 20% in the ferroalloy. Up to 95% of the niobium, and up to 80% of the tantalum contained in the concentrate were recovered in the metal. The ferroalloy was ground finely and dissolved in 2 wt % sulphuric acid to leach out iron and silicon preferentially. The insoluble residue consisted principally of NbC and TaC, the calcination of which yielded an enriched concentrate comprising 80% Nb2O5 and 8% Ta2O5. The insoluble residue could also be chlorinated to obtain an impure liquid of NbCls and TaCl5. Process variables and their effects are discussed in terms of higher metal recoveries in the smelting.
Keywords: Pyrometallurgy, Smelting, Leaching, Calcination, Niobium, Tantalum, Ferroalloys.
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Summary: The Cape Ray Fault Zone of southwestern Newfoundland contains two notable electrum/base metal sulphide quartz vein lode occurrences hosted by two contrasting lithological units, viz. a graphite schist horizon and a granite. The two occurrences, although in proximity, are not in direct contact, but, based on geochronological, geochemical and isotopic evidence, they were apparently deposited from hydrothermal fluids generated as a vapour phase from the magmatic progenitor of the Windowglass...
Publication: CIM Bulletin
Author(s): DEREK H.C.WILTON
Keywords: Gold mineralization, Rare earth elements, Cape Ray, Electrum deposits, Hydrothermal fluids, Gold, Silver, Granites.
Issue: 874
Volume: 78
Year: 1985
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Summary: A trondhjemite stock intrudes a volcanic sequence that has massive sulphide lenses and that is metamorphosed to the green-schist fades at Gutcher Lake, 25 km north of Wawa, Ontario. The stock is 4 km2 in plan and is partly enveloped by an aureole of chlorite-epidote-amphibole hornfels up to 1 km wide. Within this contact aureole, biotite is partly pseudomorphosed by chlorite; epidote and hornblende are mottled by chlorite, calcite, plus quartz; albite has 0% An to 8% An; and hornblende...
Publication: CIM Bulletin
Author(s): P.A. STUDEMEISTER
Keywords: Gold exploration, Gold-bearing veins, Regional metamorphism, Retrograde metamorphism, Felsic intrusions, Greenstone belts, Mineral alteration.
Issue: 874
Volume: 78
Year: 1985
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Summary: The recent opening of Muscocho's gold mine at Montauban, as well as the discovery of several new copper-gold showings of a similar nature near the confluence of the Saguenay and St. Lawrence has revealed the existence of a new metallogenic gold province which is located within supercrustal units of Helikian age within the Grenville Province. Three metalliferous belts have been identified, each one of which is related to a series of SW-NE trending faults. The first is located in southeastern...
Publication: CIM Bulletin
Author(s): MICHEL GAUTHIER, GAETAN MORIN, PIERRE MARCOUX
Keywords: Gold mineralizalion, Gold, Melallogeny, Grenville Province, Monlauban region.
Issue: 874
Volume: 78
Year: 1985
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Summary: Kidd Creek is a large volcanogenic base metal sulphide deposit, located near the west end of the Abitibi greenstone belt, 27 km north of Timmins, Ontario. The rhyolite geology is characterized by a NNE-striking and steeply east-dipping package of rhyolite volcaniclastics upon which has been imposed a strong ESE-striking and north-dipping structural fabric. Massive rhyolite units with grey-black, chloritic cores and yellow, sericitic margins intrude as dykes into the stratigraphic footwall and...
Publication: CIM Bulletin
Author(s): P.P. GOAD
Keywords: Economic geology, Kidd Creek Mine, Volcanogenic deposits, Base metal sulphide deposits, Rhyolite geology, Massive rhyolites, Rhyolite volcaniclastic, Crackle-brecciated rhyolites, Stringer sulphide zone, Hydrothermal alteration, Mature alteration, Immature alteration, Hydraulic fracturing, Evolution felsic pile, Exploration.
Issue: 874
Volume: 78
Year: 1985
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