Physicochemical aspects of the fabrication of tungsten powder by the metallothermy of the scheelite concentrate in ionic melts

Preparation conditions of tungsten powder by the decomposition of the scheelite concentrate in the medium of NaCl–Na 2 CO 3 , NaCl–Na 2 CO 3 –NaF, and NaCl–Na 2 CO 3 –Na 3 AlF 6 salt melts and the reduction of formed sodium tungstate with aluminum at 1123–1273 K are investigated. It is established t...

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Bibliographic Details
Published in:Russian journal of non-ferrous metals 2015-07, Vol.56 (4), p.387-391
Main Author: Gostishchev, V. V.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Materials Science
Metallic Materials
Metallurgy of Nonferrous Metals
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Summary:Preparation conditions of tungsten powder by the decomposition of the scheelite concentrate in the medium of NaCl–Na 2 CO 3 , NaCl–Na 2 CO 3 –NaF, and NaCl–Na 2 CO 3 –Na 3 AlF 6 salt melts and the reduction of formed sodium tungstate with aluminum at 1123–1273 K are investigated. It is established that the powder yield is ~93 wt % and purity of tungsten is 97%. Granulometric characteristics of powders are determined. It is shown that the specific surface of powders reaches 14.6 × 10 5 m –1 .
ISSN:1067-8212
1934-970X
DOI:10.3103/S1067821215040045