A process for gallium recovery by cyclone electrowinning was proposed to inhibit concentration polarization and improve current efficiency (CE). The diffusion coefficient of GaO 2 − in 120 g/L NaOH solution was determined to be 1.65×10 −7 cm 2 /s by electrochemical study. The effect of various parameters on gallium electrowinning was investigated, and the optimum conditions were determined as: titanium cathode, current density of 750 A/m 2 , gallium concentration of 39.9 g/L, NaOH concentration of 120 g/L, and circulation flow of 200 L/h. Under these conditions, the CE and gallium recovery of electrowinning were 47.9% and 90.2%, respectively. The precipitated gallium can be easily separated from the cathode, and the final purity of gallium after washing was 99.993%. The energy consumption (EC) of gallium cyclone electrowinning was about 9048 kW·h/t. Overall, it is suggested that cyclone electrowinning is a promising process for gallium production with high CE and low EC.
Shuojian Su,Zhenguo Huang,Yanna NuLi,Felure Tuerxun,Jun Yang,Jiulin Wang
The strong push for electric vehicles and large-scale power storage systems has generated intense interest in rechargeable magnesium batteries due to the innate merits associated with the magnesium metal anode in terms of volumetric capacity, abundance, and operational safety. Herein, we report a novel pathway toward the development of an advanced battery containing a magnesium anode, a titanium dioxide cathode, and a magnesium borohydride/tetraglyme electrolyte, which delivers high specific capacity, as well as exceptional cycle life and rate capability. This work demonstrates the importance of compatibility of the electrochemical activities of the cathode materials and electrolytes in rechargeable Mg batteries.
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