Rapid Leaching of Synthetic Scheelite by a Resin-in-Pulp Process
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Extraction of tungsten from scheelite has attracted considerable attention due to the progressive exhaustion of wolframite. This work presents a resin-in-pulp (RIP) technique to extract tungsten from synthetic scheelite. Decomposition of scheelite and extraction of tungsten from the leaching solution were achieved simultaneously by using diluted acid with 310 resin. The effects of the pH value of the acid solution, temperature, liquid-to-solid ratio, and resin dose on the scheelite leaching were investigated. The results showed that more than 96% of tungsten could be extracted. Furthermore, tungsten loaded on anion resin was effectively desorbed by using NH4OH as desorbent, and under the optimal desorption condition, the desorption efficiency reached up to 98.37%. Kinetic study suggested that the extraction of tungsten by the RIP technique could be fit using the Avrami kinetic model equation and was a chemical-controlled process. This work demonstrates that RIP can provide an effective way to extract tungsten from scheelite.
This work was financially supported by the National Natural Science Foundation of China (No. 21707167) and the Fundamental Research Funds for the Central Universities of Central South University.
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