Abstract
Tungsten, considered a specialty metal, plays a remarkable role in the development of new tools for aerospace, defense, and other trending technological applications. However, due to its high supply risk index, extensive research on alternative sources for recycling has been conducted. In this contribution, the recovery of tungsten from spent electroless nickel solutions as a secondary metal source for this element is described for the first time. Laboratory experimental procedures are presented, involving the acid-promoted tungstite precipitation where the oxidizing properties of nitric acid demonstrated to play a key role in the tungsten oxide product formation. Further reaction with calcium hydroxide allows the rapid isolation of high-purity scheelite (>98%) in good yield. This protocol serves as a model for a tungsten recovery pilot plant scale-up, where other reactions for the preparation of additional tungsten derivatives, employing scheelite as starting material, can be implemented.
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