Extraction of Ferrotungsten from Ores with Low WO3 Content

Aluminothermic SHS reaction was explored as a possible route to manufacturing ferrotungsten alloy (FeW) from an ore concentrate. Changing green composition, i.e. the amount (x) of Al, it was possible to control the composition and microstructure of resultant alloys. Regardless of green composition, the final product always consisted of three phases: W, FeW, and Fe-Al-W. Compositions of the W and FeW phases were independent of x, while the Al content of the Fe-Al-W phase grew with increasing x. An alloy most closely fitting specification requirements was synthesized from green mixtures with a slightly lower amount of Al as compared to a stoichiometric one.

 

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