The direct chlorination of tungsten raw materials and subsequent reduction of the chloride to tungsten metal would offer a much simpler and cheaper production path in comparison to the rather complicated one via hydrometallurgy to APT and a two-stage reduction to tungsten metal. Although several promising attempts have been made, it is interesting to note that chlorination chemistry of tungsten has not found its way into large-scale production, unlike other refractory metals such as zirconium, hafnium, titanium, niobium, and tantalum. None of the processes mentioned below survived for long or are in use today.
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