Cathode for a cell for fused salt electrolysis

An electrolytic cell for the electrolysis of a molten electrolyte having anode and cathode elements, in particular for the production of molten aluminum, said cell having individually exchangeable cathode elements comprising two parts made of different materials rigidly joined together with an upper part adapted to project from the molten electrolyte into the precipitated aluminum and a lower part, wherein the level of precipitated aluminum is adapted to be above said lower part, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum.

A cathode of individually exchangeable elements for a fused salt electrolytic cell for the production of molten aluminum from a molten electrolyte which comprises two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein said upper part comprises vertical plates which have a horizontal surface.

A cathode of individually exchangeable elements for a fused salt electrolytic cell for the production of molten aluminum from a molten electrolyte which comprises two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein said cathode is stabilized by the inclusion of intermediate pieces which can withstand liquid aluminum.

A cathode of individually exchangeable elements for a fused salt electrolytic cell for the production of molten aluminum from a molten electrolyte which comprises two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein said cathode is stabilized by the inclusion of cement which can withstand liquid aluminum.

A cathode of individually exchangeable elements for a fused salt electrolytic cell for the production of molten aluminum from a molten electrolyte which comprises two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein at least one window is provided in said cathode.

A cathode of individually exchangeable elements for a fused salt electrolytic cell for the production of molten aluminum from a molten electrolyte which comprises two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein only said upper part has a core made of a material selected from the group consisting of steel, titanium and graphite.

A cathode of individually exchangeable elements for a fused salt electrolytic cell for the production of molten aluminum from a molten electrolyte which comprises two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein only said lower part has a core made of a material selected from the group consisting of steel, titanium and graphite.

A cathode of individually exchangeable elements for a fused salt electrolytic cell for the production of molten aluminum from a molten electrolyte which comprises two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein at least the surface of said upper part is made of a material selected from the group consisting of titanium diboride, titanium carbide, titanium nitride, zirconium diboride, zirconium carbide, zirconium nitride and mixtures thereof and wherein at least the surface of the material of the upper part contains an addition of a small amount of boron nitride.

A cathode of individually exchangeable elements for a fused salt electrolytic cell for the production of molten aluminum from a molten electrolyte which comprises two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein said upper part includes an inclined underside.

An electrolytic cell for the electrolysis of a molten electrolyte having anode and cathode elements, in particular for the production of molten aluminum, said cell having individually exchangeable cathode elements comprising two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein said upper part comprises plates which are arranged vertically in the cell and which have a horizontal surface.

An electrolytic cell for the electrolysis of a molten electrolyte having anode and cathode elements, in particular for the production of molten aluminum, said cell having individually exchangeable cathode elements comprising two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein at least one window is provided in said cathode.

An electrolytic cell for the electrolysis of a molten electrolyte having anode and cathode elements, in particular for the production of molten aluminum, said cell having individually exchangeable cathode elements comprising two parts made of different materials rigidly joined together with an upper part projecting from the molten electrolyte into the precipitated aluminum and a lower part situated exclusively in the molten aluminum, wherein at least the surface of the upper part is made of a material which at the working temperature is a good electrical conductor, is chemically resistant and is wet by aluminum, and at least the surface of the lower part is made of an insulating material which is resistant to liquid aluminum, wherein at least the surface of the upper part is made of a material selected from the group consisting of titanium diboride, titanium carbide, titanium nitride, zirconium diboride, zirconium carbide, zirconium nitride and mixtures thereof and wherein at least the surface of the material of the upper part contains an addition of a small amount of boron nitride.