铝电解中SnO2+Sb2O3+CuO惰性阳极的电流效率、腐蚀性及结构变化

系统研究了霍尔赫鲁特铝电解池中SnO₂基惰性阳极 (96%SnO₂+2%Sb₂O₃+2%CuO)的电流效率，腐蚀性以及结构变化. 评价了各种操作参数(温度、电流密度、阴阳两级的距离、冰晶石量比、Al₂O₃ 浓度和电解质组成)对电流效率和腐蚀性的影响.

Current Efficiency, Corrosion and Structural Changes in SnO2-Sb2O3-CuO Inert Anodes for Aluminium Electrolysis

A systematic study was conducted on current efficiency (CE), corrosion and structural changes in SnO₂-based inert anodes (made of 96wt%SnO₂+2wt%Sb₂O₃+2wt%CuO) on a laboratory Hall-Heroult aluminium cell. The influence of operating parameters and elec-trolyte composition on the CE and corrosion process were evaluated. The CE was found to be more than 90% and catastrophic corrosion took place at low percent of Al₂O₃, high percent of LiF, low cryolite ratio and high current densities. From all the structural changes that took place in the SnO₂-based inert anodes, we assumed that the most important contri-bution was due to the migration of CuO towards the outer limits of the constituent grains of SnO₂ based ceramic. The complex process occurred during the formation of various phases and their sintering ability both directly depended on Cu/Sb molar ratio.