Improvements in or relating to electrolytic cells for the production of aluminium

摘要: The free carbon content in zirconium carbide is reduced by a process similar to that described Specification 784,697 with respect titanium carbide, but the final firing temperature 2700 DEG C. 784,696 also referred to.ALSO:A compact mass of for use as cathode fused-electrolytic cell obtaining aluminium made first mixing powdered material having mean particle diameter 1-2 microns binder such 1 per cent paraffin wax dissolved benzene. This heated evaporate benzene and melt compacted pressure 0.5-5 tons sq. inch. Compacting may be effected between male female dies at an ordinary or elevated temperature, p extruded into desired shape. then prefired vacuum 1100 If not already formed shape it worked sawing, filing like operation. It fired 1600 C., neutral gas, e.g. hydrogen. A similarly made, prefiring being this case subsequent 2200 product must below 0.5 cent, preferably 0.1 cent. commercial powder containing some oxide employed about 2-3 alumina before operation above described, employing higher sintering temperatures. Specifications are 0,5-5 pre-fired e.g., pre-firing 0,5 0,1 operations to.