Study on iron-nickel metal anode for aluminium electrolysis

摘要

A Fe-43Ni (wt%) alloy made by powder metallurgy and used as anode for aluminum electrolysis, is described in the present paper. Electrolysis with this anode was conducted for ten hours at 850℃in a molten salt consisting of NaF-43.7AlF3-8NaCl-5CaF2-4Al2O3 (wt.%). The anodic current density was 0.75 A/cm2. Electrolysis was carried out smoothly with a fluctuation of the cell voltage within the range of 3.8-4.1 V. Electron Probe Micro-analyzer and X-Ray Diffraction results showed that the film generated on the anodic substrate consisted of iron oxide as the major phase, and with nickel oxide and nickel ferrite as minor phases. The metal anode showed good performance in terms of anti-oxidation and corrosion resistance. The average annual anode wear rate was calculated to be 21 millimeter, and the purity of the aluminum produced was 97-98%.