Resin-enhanced acid leaching of tungsten from scheelite

Add time:08/05/2019    Source:sciencedirect.com

Leaching of tungsten from scheelite is critical for the reclamation of tungsten resources. Conventional approaches for tungsten leaching involve the problems of low efficiency, sophisticated equipment demand, or complicated follow-up issues. In this study, a resin-enhanced acid leaching method was developed for the rapid extraction of tungsten from both natural scheelite and synthetic scheelite. Herein, 732 resin was used to accelerate the leaching process and increase the leaching yield of tungsten through the adsorption of Ca2+ and the release of H+. The leaching process was significantly affected by acid concentration, resin dosage, liquid-to-solid ratio, and temperature. Furthermore, the leaching reaction followed the chemical reaction-controlled kinetics, and tungsten was extracted in the form of isopoly-tungstic acid. This study may provide a cost-effective alternative for the rapid decomposition of scheelite under relatively low temperature conditions.

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