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| Number | Title | Issue Date |
| 7854783 | Carbothermic aluminum production apparatus, systems and methods Apparatus, systems and methods for carbothermically producing aluminum are disclosed. The systems may include a reactor and an electrical supply. The reactor may include a plurality of side-entering electrodes and a top-entering electrode. The electrical supply may ... | 12/21/2010 |
| 7819937 | Use of alumina-carbon agglomerates in the carbothermic production of aluminum An agglomerate comprising alumina, carbon, and a binder for use in a vapor recovery reactor of a carbothermic alumina reduction furnace is disclosed. A method for using alumina-carbon agglomerates to capture aluminum vapor species and utilize waste heat from off-gas... | 10/26/2010 |
| 7736413 | Method for using fracture resistant electrodes in a carbothermic reduction furnace Graphite electrodes for the production of aluminum by carbothermic reduction of alumina are either submerged in the molten bath in the low temperature compartment or they are horizontally arranged in the side walls of the high temperature compartment. The electrodes... | 06/15/2010 |
| 7556667 | Low carbon aluminum production method using single furnace carbothermic reduction operated in batch mode A batch process for producing low carbon aluminum using a single carbothermic reactor furnace is disclosed in which the slag making, metal making and carbon extraction is carried out in a single furnace, single compartment reactor. The Al2O and Al vapors ... | 07/07/2009 |
| 7169207 | Device and method for treatment of gases The device and method of the present invention employs a column having a gas inlet in its lower part and a gas outlet in its upper part. Carbon particles are introduced into the column through a supply pipe. The supply pipe is movable so that by manipulating the hei... | 01/30/2007 |
| 6980580 | Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace The electrode arrangement uses vertically oriented electrodes with side wall contacts for an electrothermic smelting furnace for aluminum production. The side wall contacts are radially moveable into the furnace to compensate for wear on the contacts. The side wall ... | 12/27/2005 |
| 6849101 | Method using selected carbons to react with Al2O and Al vapors in the carbothermic production of aluminum In a method for recovering Al from an off-gas (3,4) produced during carbothermic reduction of aluminum utilizing at least one smelter (1,2), the off-gas (3,4) is directed to an enclosed reactor (5) which is fed a supply of wood charcoal (... | 02/01/2005 |
| 6805723 | Method and reactor for production of aluminum by carbothermic reduction of alumina A hollow partition wall is employed to feed carbon material to an underflow of a carbothermic reduction furnace used to make aluminum. The partition wall divides a low temperature reaction zone where aluminum oxide is reacted with carbon to form aluminum carbide and... | 10/19/2004 |
| 6530970 | Method for recovering aluminum vapor and aluminum suboxide from off-gases during production of aluminum by carbothermic reduction of alumina A method for aluminum recovery during the carbothermic production of aluminum in a smelting furnace (1,2) is disclosed, where during carbothermic reduction of alumina, aluminum and aluminum suboxide vapors are produced (3, 4), which are reacting with carb... | 03/11/2003 |
| 6475260 | Carbothermic aluminum production using scrap aluminum as a coolant A process for producing aluminum metal by carbothermic reduction of alumina ore. Alumina ore is heated in the presence of carbon at an elevated temperature to produce an aluminum metal body contaminated with about 10-30% by wt. aluminum carbide. Aluminum ... | 11/05/2002 |
| 6440193 | Method and reactor for production of aluminum by carbothermic reduction of alumina The present invention relates to a process for carbothermic production of aluminum where molten bath aluminum carbide and aluminum oxide are produced in a low temperature compartment (2), and continuously flow into a high temperature compartment (3) where... | 08/27/2002 |
| 6361580 | Method for production of aluminum A continuous process for the production of elemental aluminum is described. Aluminum is made from aluminum oxide and a reducing gas such as a light hydrocarbon gas or other reducing gas, for example hydrogen. In the process, a feed stream of the aluminum ... | 03/26/2002 |
| 5961812 | Process and gaseous effluent-collection device for changing spent anodes of pots for electrolysis of aluminum A process for changing spent anodes while recovering the majority of the gaseous compounds evolved by the spent anodes and by the bath crust removed from the electrolytic pots during the cooling phase uses an effluent-collection device for electrolytic po... | 10/05/1999 |
| 5316565 | Carbothermic reduction product gas treatment Method and apparatus for reducing the quantity of carbon dioxide emitted to the atmosphere from carbothermic processes producing metals are described. The method involves rejecting carbon from the process system or using carbon as a reagent to be recycled... | 05/31/1994 |
| 4812168 | Process for carbothermic production of alkaline earth metal aluminide and recovery of same An improved process is disclosed for carbothermically producing an alkaline earth metal aluminide from an aluminum-bearing material which, in one aspect comprises forming a mixture of a carbonaceous reducing agent and a slag comprising the aluminum-bearin... | 03/14/1989 |
| 4770696 | Process for carbothermic production of calcium aluminide using calcium carbide An improved process is disclosed for carbothermically producing an alkaline earth metal aluminide from an aluminum-bearing material which, in one aspect comprises forming a mixture of a carbonaceous reducing agent and a slag comprising the aluminum-bearin... | 09/13/1988 |
| 4769068 | Process for production of aluminum by carbothermic production of alkaline earth metal aluminide and stripping of aluminum from alkaline earth metal aluminide with sulfurous stripping agent An improved process is disclosed for carbothermically producing an alkaline earth metal aluminide from an aluminum-bearing material which, in one aspect comprises forming a mixture of a carbonaceous reducing agent and a slag comprising the aluminum-bearin... | 09/06/1988 |
| 4769067 | Process for production of aluminum by carbothermic production of an alkaline earth metal aluminide such as calcium aluminide and recycling of reactant byproducts An improved process is disclosed for carbothermically producing an alkaline earth metal aluminide from an aluminum-bearing material which, in one aspect comprises forming a mixture of a carbonaceous reducing agent and a slag comprising the aluminum-bearin... | 09/06/1988 |
| 4769069 | Process for production of aluminum by carbothermic production of alkaline earth metal aluminide and stripping of aluminum from alkaline earth metal aluminide with halide stripping agent An improved process is disclosed for carbothermically producing an alkaline earth metal aluminide from an aluminum-bearing material which, in one aspect comprises forming a mixture of a carbonaceous reducing agent and a slag comprising the aluminum-bearin... | 09/06/1988 |
| 4765832 | Process for carbothermic production of calcium aluminide using slag containing calcium aluminate An improved process is disclosed for carbothermically producing an alkaline earth metal aluminide from an aluminum-bearing material which, in one aspect comprises forming a mixture of a carbonaceous reducing agent and a slag comprising the aluminum-bearin... | 08/23/1988 |
| 4533386 | Process for producing aluminum A carbothermic reduction process for extracting commercially pure aluminum from sources of alumina containing substantial amounts of compounds of elements in the group comprising iron, silicon and titanium is disclosed. The method involves selective reduc... | 08/06/1985 |
| 4491471 | Composite pellet for use as a carbothermic reduction feed A composite pellet for use as feed for a carbothermic alumina reduction furnace is disclosed. A carbonaceous core is surrounded by substantially carbon-free alumina shell. The resulting pellet has increased thermal and electrical stability in the reductio... | 01/01/1985 |
| 4491472 | Carbothermic reduction and prereduced charge for producing aluminum-silicon alloys Disclosed is a method for the carbothermic reduction of aluminum oxide to form an aluminum alloy including producing silicon carbide by heating a first mix of carbon and silicon oxide in a combustion reactor to an elevated temperature sufficient to produc... | 01/01/1985 |
| 4486229 | Carbothermic reduction with parallel heat sources Disclosed are apparatus and method of carbothermic direct reduction for producing an aluminum alloy from a raw material mix including aluminum oxide, silicon oxide, and carbon wherein parallel heat sources are provided by a combustion heat source and by a... | 12/04/1984 |
| 4441920 | Method for the thermal production of metals A method and apparatus for the continuous production of metals and/or carbides by thermal reduction is described. In the process, a mixture of metal oxide and carbon is agglomerated, each piece of agglomerate encased in carbon and/or graphite, the carbon ... | 04/10/1984 |
| 4419126 | Aluminum purification system A method for extracting aluminum of substantial purity from furnace products resulting from carbothermic reduction of alumina-bearing ores and contaminated with up to about 30 weight percent of aluminum carbide is disclosed. The method involves contacting... | 12/06/1983 |
| 4409021 | Slag decarbonization with a phase inversion A batch method is described for decarbonizing aluminum primary furnace product from an aluminum carbide content of up to about 35% to a useful content of about 2% Al4 C3. The method maximizes mass transfer of the aluminum carbide fro... | 10/11/1983 |
| 4388107 | Minimum-energy process for carbothermic reduction of alumina Alumina is carbothermically and cyclically reacted with carbon and recycled materials within a reduction zone to produce a slag layer, an overlying aluminum metal layer, and vaporization products which are passed through a vapor-permeable back-reaction zo... | 06/14/1983 |
| 4385930 | Method of producing aluminum A method of producing aluminum is carried out in an electric arc furnace having primary and secondary zones separated by a divider constructed to permit the flow of molten but not gaseous products between zones. The method includes providing a charge of c... | 05/31/1983 |
| 4334917 | Carbothermic reduction furnace A carbothermic reduction process is described for producing alumina metal containing about 10% Al4 C3. The process heats a descending charge by radiation at a rate of heat flux of 10-100 KW/sq. inch, to form a melt surface that is sp... | 06/15/1982 |
| 4314846 | Method for carbothermic production of aluminum A method for production of aluminum and aluminum alloys by carbothermic reduction of alumina alone or in its mixtures with other oxides, comprising the steps of supplying the reducing agent carbon, and the oxide which shall be reduced, along separate path... | 02/09/1982 |
| 4299619 | Energy efficient production of aluminum by carbothermic reduction of alumina A method for production of aluminum by carbothermic reduction of Al2 O3 in a stack-type reactor. A charge of Al2 O3 and C is inserted into an upper reaction zone of the reactor and reacted at an elevated tempera... | 11/10/1981 |
| 4261736 | Carbothermic production of aluminium In a process for the treatment of fume-laden carbon monoxide evolved in carbothermic reduction of alumina the fume-laden gas is contacted with particulate carbon in a fluidized bed maintained at a temperature, preferably in the range 2010°-2050° C. and ... | 04/14/1981 |
| 4226618 | Carbothermic production of aluminium In a process for production of aluminium metal carbon monoxide gas evolved at very high temperature through reaction of aluminium carbide and alumina is cooled by contact with a molten alumina slag at a lower temperature to cause back reaction of containe... | 10/07/1980 |
| 4224054 | Process for the production of aluminium A process for the production of aluminium in two steps: and Reaction (ii) takes place in a materials addition chamber and reaction (iii) in a high temperature chamber. Slag is circulated between the chambers via conduits and is promoted by gas supplied from a... | 09/23/1980 |
| 4224059 | Carbothermic production of aluminium In a process for production of aluminium metal described in U.S. Pat. No. 4,099,959 carbon monoxide gas is evolved at very high temperature through reaction of aluminium carbide and alumina in a high temperature zone of the system. This gas is cooled by c... | 09/23/1980 |
| 4224055 | Process for the production of aluminium A process for the production of aluminium in two steps: and Reaction (ii) takes place in a materials addition chamber and reaction (iii) in a high temperature chamber. Slag is circulated between the chambers via conduits and electrical resistance heating is ca... | 09/23/1980 |
| 4216010 | Aluminum purification system A method for extracting aluminum of substantial purity from furnace products resulting from carbothermic reduction of alumina-bearing ores and contaminated with up to about 30 weight percent of aluminum carbide is disclosed. The method involves contacting... | 08/05/1980 |
| 4177060 | Reduction of stable oxides In a process for the carbothermal reduction of alumina, carbon and alumina are supplied to a molten reaction bed in a hearth in the floor of a reactor. The reaction bed is supplied with energy by contact with plasma or with plasma effluents. For this purp... | 12/04/1979 |
| 4146389 | Thermal reduction process of aluminium The thermal reduction process for producing metals such as aluminum in a reactor utilizes a dispersed discharge to provide the heat of reaction within the reaction zone in the presence of aluminum vapor to maintain the temperature in excess of 2000° C. T... | 03/27/1979 |
