Aluminium Electrolysis with Fe-Ni-Al(2)O(3) Inert Anodes at 850 degrees C

作者：Shi Zhongning^*; Junli Junli; Gao Bingliang; Hu Xianwei; Wang Zhaowen

来源：High Temperature Materials and Processes, 2011, 30(3): 247-251.

DOI：10.1515/HTMP.2011.039

• Inert anodes
• aluminium electrolysis
• corrosion
• Fe-Ni-Al(2)O(3)

Fe-Ni-Al(2)O(3)cermet materials were prepared, and the electrolysis with these anodes were performed in cryolite-based electrolyte consisted of 44NaF-40AlF(3)-8NaCl-5CaF(2)-3Al(2)O(3)( wt%) at 850 degrees C. The purity of produced aluminium is 97-98%, while the calculated anodic corrosion rate is 18.2 mm/a-24.0 mm/a. The EPMA analysis showed that there is an oxide scale consisting of Fe(2)O(3) and FeAl(2)O(4) on the anode working surface. The homeostasis of dissolution and formation of oxide scale makes the thickness of the oxide scale and the cell voltage stable within a certain range. The dissolution of oxide scale results in the presence of FeF(3) in the electrolyte. By analysis of the corrosion process, it shows that low temperature, high alumina concentration and low CR electrolysis is preferred for using Fe-Ni-Al(2)O(3) inert anodes for aluminium electrolysis.

• 出版日期2011-6
• 单位东北大学