STUDY ON THE NICKEL FERRATE SPINEL INERT ANODE FOR ALUMINUM ELECTROLYSIS

摘要

In the late decades, a series of new technologies such as inert anode, wettable cathode and lower temperature electrolysis for primary aluminum production had been studied, for saving energy, debasing cost and erasing environmental pollution. The thesis studied the preparation and the properties of cermet inert anode based on NiFe_2O_4 spinel. We choose the Ni_2O_3 and Fe_2O_3 as primary ingredients to synthesize spinel by means of powder metallurgy. We studied the preparation technology and the characteristics of the cermet material at first, then we tried to add small amounts of superaddition to improve its performance such as conductivity and corrosion resistance. The results showed that the foreign additive containing different chemical valence ion from Ni~(2+) and Fe~(3+) could significantly refine characteristics of the cermet inert anode, and the inert anode based on NiFe_2O_4 spinel could be improved by the means of adding TiO_2 and MnO_2 to the ceramic phase.