Mechanism of Tungsten Recovery from Spent Cemented Carbide by Molten Salt Electrodeposition

The accumulation of spent carbide (YG8), not only pollutes the environment but also causes waste tungsten, cobalt and other rare metal resources. To better address this issue, we proposed a combined electrochemical separation process low-temperature aqueous solution high-temperature molten salt for tungsten cobalt. H<sub>2</sub>WO<sub>4</sub> was obtained from in an solution, calcined it to obtain WO<sub>3</sub>, which used as raw material by using electrodeposition. influence current efficiency behavior discharge precipitation W(VI) were studied. calcination results showed that morphology WO<sub>3</sub> regular there no impurities. maximum 82.91% achieved series electrodeposition experiments. According XRD SEM analysis, recovered product high purity belongs simple cubic crystal system. In reduction mechanism experiments, NaCl-Na<sub>2</sub>WO<sub>4</sub>-WO<sub>3</sub> investigated linear scanning voltammetry (LSV) chronoamperometry three-electrode LSV reduced at cathode two steps electrode reaction controlled diffusion. fitting nucleation instantaneous mode, diffusion coefficient 7.379×10<sup>−10</sup> cm<sup>2</sup>·s<sup>−1</sup>.