Anodic process on Cu-Al alloy in KF-AlF3-Al2O3 melts and suspensions  

KF-AlF3-Al2O3熔体和悬浮液中Cu-Al合金的阳极过程

作　　者：Sai Krishna PADAMATA Andrey S.YASINSKIY Petr V.POLYAKOV Sai Krishna PADAMATA;Andrey SYASINSKIY;Petr VPOLYAKOV(School of Non-Ferrous Metals and Materials Science,Siberian Federal University,Krasnoyarsk,Russia)

机构地区：[1]School of Non-Ferrous Metals and Materials Science,Siberian Federal University,Krasnoyarsk,Russia

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第5期1419-1428,共10页中国有色金属学报（英文版）

摘　　要：Anodic processes on Cu-10 Al electrode in molten KF-AlF3-Al2O3(saturated) and suspensions were characterized using chronopotentiometric and cyclic voltammetric techniques. Effects of cryolite ratio(CR= x(KF)/x(AlF3)), temperature and particle volume fraction(φ) on the electrochemical behaviour of the anode were demonstrated. Initially, the anode was polarised in the galvanostatic mode in melt and suspensions(φ=0.12, 0.15) at 750 ℃ with 0.4 A/cm^2 current density. The anode potential in melt varied between 2.5 and 3.2 V and in suspensions(φ= 0.12) between 3.3 and 3.4 V. XRD analysis was conducted to study the oxide phases on the anode surface. Anode limiting current densities and mass transfer coefficients drastically decreased with the increase of φ in the suspension. The results suggest that the Cu-10 Al electrode works better in suspensions with CR of 1.4 and particle volume fraction of 0.09 at 800 ℃.使用计时电位和循环伏安技术表征熔融KF-AlF3-Al2O3(饱和)和悬浮液中Cu-10Al电极阳极过程,证明冰晶石比(CR=x(KF)/x(AlF3))、温度和颗粒体积分数(φ)对阳极电化学行为的影响。最初,在750℃和电流密度为0.4 A/cm^2的条件下,以恒电流模式在熔体和悬浮液(φ=0.12,0.15)中进行阳极极化。熔体中的阳极电势在2.5~3.2 V之间变化,悬浮液(φ=0.12)的阳极电势则在3.3~3.4V之间变化。采用XRD分析阳极表面的氧化物相。阳极极限电流密度和传质系数均随着悬浮液中体积分数的增加而急剧下降。研究结果表明,使用Cu-10Al阳极的较好工艺参数是:800℃,熔体CR 1.4,颗粒体积分数约0.09。

关 键 词：aluminium suspension oxidation inert anode cryolite melt low-temperature electrolysis 

分 类 号：TF811[冶金工程—有色金属冶金]