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INTERNATIONAL TUNGSTEN INDUSTRY ASSOCIATION

Information on tungsten: sources, properties and uses

Concentrates

Marketable ore concentrates of scheelite and wolframite (hübnerite, ferberite) contain typically 65 – 70 % WO₃.  Off-grade concentrates having lower WO₃ concentrations are seldom on the market and if so, only for a lower price.  In fully integrated companies lower grades (6-40% WO₃) are often preferred, because upgrading to high concentrations is mostly combined with a lower yield.

Concentrates are packaged either in large polyethylene “big bags” (1 to 2 tons) or, alternatively, in steel drums and individual packaging (40 to 200kg).