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| Number | Title | Issue Date |
| 7255893 | Protection of non-carbon anodes and other oxidation resistant components with iron oxide-containing coatings A method of forming a dense and crack-free hematite-containing protective layer on a metal-based substrate for use in a high temperature oxidising and/or corrosive environment comprises applying onto the substrate a particle mixture consisting of: 60 to 99 95 weight... | 08/14/2007 |
| 6911134 | Three-electrode metal oxide reduction cell A method of electrochemically reducing a metal oxide to the metal in an electrochemical cell is disclosed along with the cell. Each of the anode and cathode operate at their respective maximum reaction rates. An electrolyte and an anode at which oxygen can be evolve... | 06/28/2005 |
| 6719890 | Cathode for a hall-heroult type electrolytic cell for producing aluminum A method of producing aluminum from alumina in an electrolytic cell including using a cathode comprised of a base material having low electrical conductivity and wettable with molten aluminum to form a reaction layer having a high electrical conductivity on said bas... | 04/13/2004 |
| 6656340 | Aluminium production cell design A cell of advanced design for the production of aluminium by the electrolysis of an aluminium compound dissolved in a molten electrolyte, has a cathode (30) of drained configuration, and at least one non-carbon anode (10) facing the cathode both covered b... | 12/02/2003 |
| 6638412 | Prevention of dissolution of metal-based aluminium production anodes A method of inhibiting dissolution of a transition metal alloy anode (40) of an aluminium electrowinning cell comprises providing a sodium-inert layer (11,20,50,50') on a sodium-active cathodic cell material (15), such as carbon, and electrolysing alumina... | 10/28/2003 |
| 6258246 | Aluminium electrowinning cell with sidewalls resistant to molten electrolyte A drained cathode cell for the electrowinning of aluminium comprises a cell bottom (20) arranged to collect product aluminium and thermic insulating sidewalls (40) lined with a molten electrolyte resistant sidewall lining (50), in particular containing si... | 07/10/2001 |
| 6083362 | Dimensionally stable anode for electrolysis, method for maintaining dimensions of anode during electrolysis A dimensionally stable electrode is provided comprising a hollow substrate with an open upper end for confining a fluid containing a metal, a film covering portions of the external surface; and a mechanism for replenishing the film. Also provided is a met... | 07/04/2000 |
| 5876584 | Method of producing aluminum A method of producing aluminum, comprising the steps of: a) providing an aluminum reduction Hall cell for reduction of alumina in molten fluoride electrolyte containing cryolite, the cell comprising a cathode, an anode and a sidewall, the sidewall having a thi... | 03/02/1999 |
| 5534130 | Application of phosphates of aluminum to carbonaceous components of aluminum production cells Carbon-containing components of cells for the production of aluminum by the electrolysis of alumina dissolved in a cryolite-based molten electrolyte are protected from attack by liquid and/or gaseous components of the electrolyte in the form of elements, ... | 07/09/1996 |
| 5492604 | Coating composition for carbon electrodes A method for producing a metal in an electrolysis cell comprising an anode, a carbon cathode, and a chamber containing a metal oxide dissolved in a molten salt bath, said method comprising: coating an outer surface portion of the cathode with a coating co... | 02/20/1996 |
| 5409589 | Production of carbon-based composite materials as components of aluminum production cells A method of producing a component of an aluminium production cell made of a carbon-based composite material containing a refractory hard metal boride, carbide, oxide, nitride or combinations or mixtures thereof and aluminium as metal, alloy or as an alumi... | 04/25/1995 |
| 5340448 | Aluminum electrolytic cell method with application of refractory protective coatings on cello components An adherent protective coating of a refractory material is produced on the surface of carbonaceous, refractory, ceramic, metallic or other materials serving as components of electrolytic cells operating at high temperature, by applying to such surfaces a ... | 08/23/1994 |
| 5062929 | Linings for aluminum reduction cells The amount of electrically conductive material in the bottom floor lining of a conventional aluminum reduction cell is reduced by using a non-conductive lining material in its place. The non-conductive material separates the remaining electrically conduct... | 11/05/1991 |
| 5024822 | Stabilization of fluorides of spent potlining by chemical dispersion A process for treating spent potlining from the electrolytic smelting of aluminum in cryolite includes incinerating the potlining to combust carbonaceous material to form an ash at a temperature low enough to maintain low fluorine vapor pressures, admixin... | 06/18/1991 |
| 4436597 | Method and apparatus for producing aluminum in an electrolysis cell with tile lining In the electrolytic production of aluminum, in a cell having a side wall including a layer of carbon electrically insulated from a jacket of metal, the improvement including interposing a layer of tile (27) between the carbon layer (23,24) and the metal j... | 03/13/1984 |
| 4239606 | Production of extreme purity aluminum A process for purifying impure aluminum comprises introducing the impure aluminum to the anode layer of an electrolytic cell of the type having a bottom layer of molten aluminum-copper alloy constituting the anode layer and having a top layer of molten al... | 12/16/1980 |
| 4160715 | Electrolytic furnace lining An improved lining for an electrolytic furnace for producing aluminum is disclosed having sufficient thickness that heat flow therethrough is such that an insulative coating provided on the inside surface of a perimetric metal shell around the electrolyti... | 07/10/1979 |
| 4140595 | Use of materials in molten salt electrolysis A method including producing metal by electrolysis in a molten salt bath, in a bipolar cell, with the improvement involving electrically isolating the bath with a continuous, electrically insulating material in the portion of the cell containing the bath,... | 02/20/1979 |
| 4135994 | Process for electrolytically producing aluminum A process for producing aluminum by electrolyzing fused aluminum chloride together with an alkali metal halide to produce chlorine gas at the anode surface and molten aluminum at the cathode surface where the electrolytic bath is of a molten mixed salt co... | 01/23/1979 |
| 4133727 | Method for extracting heat from a chamber containing a molten salt A method is disclosed by which heat may be extracted from an electrolysis chamber containing a molten salt bath. The method includes providing the chamber with a portion having a surface bordering directly on a gas space above the molten salt bath. Consti... | 01/09/1979 |
| 4049511 | Protective material made of corundum crystals A molten salt charge as used in the electrolysis of aluminum contains aluminum oxide in excess of the eutectic composition and is cooled at a surface colder than the melt in such a way that the aluminum oxide precipitates onto this surface in the form of ... | 09/20/1977 |
| 4033836 | Electrolytic reduction cell An improved electrolytic reduction cell comprises a metal shell, a layer of carbonaceous material permeable by sodium and an insulative layer of aluminum fluoride disposed intermediate the metal shell and the layer of carbonaceous material, the aluminum f... | 07/05/1977 |
| 3932244 | Production of carbon lining for reduction cells In making carbon bodies for lining aluminum reduction cells, an aggregate including carbon recovered from used linings of such cells is mixed with binder material incorporating an alkaline-catalyzable furan binder. Residual contaminant material in the rec... | 01/13/1976 |
