Effect of metallic content on sintering behavior of NiFe2O4-based cermet inert anode for aluminum electrolysis

Sintering kinetics and properties of NiFe2O4‐based ceramics inert anodes doped with TiN nanoparticles

“…Contrast to consumable carbon anode, there are mainly two key features of inert anode. One is that a significant decrease of the greenhouse gas (including CO 2 and perfluorocarbons) emissions for the production of O 2 instead of CO 2 and elimination of the anodic effect, which is consistent with sustainable economic development and environment‐friendly industrial production 4–8 . The other one is an acceptable decrease of the Al production costs for preventing frequent anode lowering and replacement operations.…”

“…One is that a significant decrease of the greenhouse gas (including CO 2 and perfluorocarbons) emissions for the production of O 2 instead of CO 2 and elimination of the anodic effect, which is consistent with sustainable economic development and environmentfriendly industrial production. [4][5][6][7][8] The other one is an acceptable decrease of the Al production costs for preventing frequent anode lowering and replacement operations. Moreover, the considerable benefits from the by-product O 2 and the unneeded emissions taxes can reduce the production cost.…”

“…Compared with metal alloy and ceramic anode, cermet inert anode has been evaluated as the most relevant substitute for consumable carbon anode in aluminum electrolysis, because it possesses both desirable properties of metal and ceramic. In particular, NiFe 2 O 4 ‐based cermet has been evaluated as ideal candidates for inert anode because of its good electrical conductivity and mechanical robustness as well as high oxidation resistance at high temperature and corrosion resistance against fluoride melts 2,6,10–13 . However, to date, the NiFe 2 O 4 ‐based cermet has not been long‐term viable in industrial aluminum electrolysis due to its insufficient corrosion–dissolution resistance in the traditional electrolytic bath, caused by the preferential corrosion of metal phase in molten salt.…”

Fabrication of high‐density NiFe2O4 ceramics by slip casting and pressureless sintering

“…Owing to its distinctive magnetic and physical properties, NiFe 2 O 4 is widely applied in several important technological fields such as catalyst, 2,3 high sensitive gas sensors, 4,5 biomedical devices, 6 microwave devices, 7 and magnetic materials 8 . Furthermore, NiFe 2 O 4 is considered to the preferred matrix of inert anode for aluminum electrolysis for its high electrochemical stability and high corrosion resistance in molten cryolite‐alumina 9,10 . These and other prospective applications have led to a growing interest in the processing of NiFe 2 O 4 bulk ceramics.…”

“…8 Furthermore, NiFe 2 O 4 is considered to the preferred matrix of inert anode for aluminum electrolysis for its high electrochemical stability and high corrosion resistance in molten cryolite-alumina. 9,10 These and other prospective applications have led to a growing interest in the processing of NiFe 2 O 4 bulk ceramics.…”