Refining of Niobium by Levitation Melting Technique

Refining of Niobium by Levitation Melting Technique

The refining behavior of niobium, produced by an aluminothermic reduction reaction of Nb/sub 2/O/sub 5/, is studied using an electromagnetic levitation and melting technique. Under experimental conditions, significant refinement of niobium thermite occurs during levitation melting. Residence time pl...

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Veröffentlicht in:J. Met.; (United States) 1985-04, Vol.37 (4), p.22-26
Hauptverfasser: Asfahani, R. I., Shahapurkar, D. S., Murty, Y. V., Patchett, J. A., Abbaschian, G. J.
Format: Artikel
Sprache:eng
Schlagworte:
360101 - Metals & Alloys- Preparation & Fabrication
CARBON
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DESORPTION
ELECTROMAGNETISM
ELEMENTS
EQUATIONS
IMPURITIES
KINETICS
LEVITATION
MAGNETISM
MATERIALS SCIENCE
MELTING
METALS
NIOBIUM
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PROCESSING
REACTION KINETICS
REDUCTION
REFINING
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZONE MELTING
ZONE REFINING
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Beschreibung
Zusammenfassung:The refining behavior of niobium, produced by an aluminothermic reduction reaction of Nb/sub 2/O/sub 5/, is studied using an electromagnetic levitation and melting technique. Under experimental conditions, significant refinement of niobium thermite occurs during levitation melting. Residence time plays a significant role in the refining process, and the refining kinetics, during levitation melting, correlate well with the approximate equations for desorption of nitrogen and carbon. The purity of the levitation-melted product is compared to that of niobium processed by the conventional EB drip-melting process.
ISSN:1047-4838
1543-1851
DOI:10.1007/BF03259440