Abstract
In this investigation, a method for obtaining massive tantalum metal through alumino-thermic reduction of its pentoxide by triggering the reaction with the help of a small amount of calcium and sulfur at a comparatively low temperature of about 450°C and using a suitable charge composition so as to form a low melting slag of A12O3—A12S3, has been developed. On a 500 gm scale of tantalum pentoxide, the yield was 88%. High purity, ductile tantalum metal has been produced from this metal by the combination of non-consumable arc and electron-beam meltings. In view of the lower cost of the reductant, high yield and some other obvious experimental advantages of alumino-thermic reduction over calcium and magnesium reductions, this process seems to be quite attractive.
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