Fig. 1. Generalized process flow sheet for the production of tungsten.
Fig. 2. Scheme of the distribution of tungsten ions in aqueous solution.
Fig. 3. Scheme for conventional recovery process of tungsten from WC-Co scrap by acid leaching.
Fig. 4. Scheme for conventional recovery process of tungsten from WC-Co scrap by alkaline leaching.
Table 1. Properties of the tungsten minerals
Table 2. Several processes for the extraction of tungsten from scheelite and wolframite
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