Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111125
Title: Reduction of Tantalum Pentoxide with Aluminium and Calcium: Thermodynamic Modelling and Scale Skilled Tests
Authors: Munter, R.
Parshin, A.
Yamshchikov, L.
Plotnikov, V.
Gorkunov, V.
Kober, V.
Issue Date: 2010
Publisher: Estonian Academy Publishers
Citation: Reduction of Tantalum Pentoxide with Aluminium and Calcium: Thermodynamic Modelling and Scale Skilled Tests / R. Munter, A. Parshin, L. Yamshchikov et al. // Proceedings of the Estonian Academy of Sciences. — 2010. — Vol. 59. — Iss. 3. — P. 243-252.
Abstract: High reactivity of powdered aluminium together with its relatively low price are the main reasons for the application of this metal as a reducing agent for the reduction of oxides and fluorides of rare and rare earth metals by the aluminothermal method. This technology is widely used in the production of master alloys for ferrous metallurgy. The "out-of-furnace" process (i.e. without external heat access) is the prevailing technology for metallic niobium production worldwide. However, aluminothermal reduction for industrial production of metallic tantalum has been limited because of the high required temperature, over 2800 °C. In this paper the results of simultaneous reduction of tantalum(V) and iron(III) oxides by calcium-aluminothermal "out-of-furnace" process are presented. Powdered aluminium and metallic calcium were used as reductants. The pickup of tantalum at smeltings with the mass of raw materials over 1 kg reached 94%. The metal was obtained in the form of compact ingot; separation of metallic and slag phases was excellent. Crushed melt underwent refining remelting in an electron beam furnace. For thermodynamic studies and optimization of the aluminothermal reduction processes of Ta2O5 and Fe2O3 in the temperature range of 1000-3000°C a licensed computer simulation program "HSC Chemistry 6.1, 2007", elaborated by the company Outotec Oy, was applied.
Keywords: OUT-OF-FURNACEQUOT
REDUCTION
ALUMINIUM
CALCIUM
COMPUTATIONAL ANALYSIS
FERRIC(III)OXIDE
RARE METALS
TANTALUM PENTOXIDE
THERMODYNAMIC FUNCTIONS
URI: http://hdl.handle.net/10995/111125
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 77956660542
ISSN: 1736-6046
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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