THE PRODUCTION OF HEMATITE-CONTAINING MATERIAL

摘要

A method of forming a hematite-containing material for use in a high temperature oxidising and/or corrosive environment, comprises sintering by heat treatment a particle mixture comprising predominantly sinterable hematite particles and substantially non-sinterable hematite particles, with a weight ratio sinterable hematite/substantially non-sinterable hematite in the range of 0.2 to 3. The sinterable hematite particles are sintered together and the substantially non-sinterable hematite particles inhibit aggregation of voids produced by the sintering. The particle mixture may comprise additives such as titanium, zinc, copper and/or other metals or oxides thereof to improve the electrical properties of the hematite-containing material, as well as non-sinterable non-oxide ceramic particles, iron metal particles and/or ferrous oxide particles or other additives such as sodium silicate. The material can be used for the manufacture of aluminium electrowinning cell components, in particular anodes.