| Patent Number |
Title Of Patent |
Date Issued |
| 7077945 |
Cu--Ni--Fe anode for use in aluminum producing electrolytic cell |
July 18, 2006 |
| A method of producing aluminum in an electrolytic cell containing alumina dissolved in an electrolyte, the method comprising the steps of providing a molten salt electrolyte at a temperature of less than 900.degree. C. having alumina dissolved therein in an electrolytic cell having a lin |
| 6866768 |
Electrolytic cell for production of aluminum from alumina |
March 15, 2005 |
| Electrolysis of alumina dissolved in a molten salt electrolyte employing inert anode and cathodes, the anode having a box shape with slots for the cathodes. |
| 6837982 |
Maintaining molten salt electrolyte concentration in aluminum-producing electrolytic cell |
January 4, 2005 |
| A method of maintaining molten salt concentration in a low temperature electrolytic cell used for production of aluminum from alumina dissolved in a molten salt electrolyte contained in a cell free of frozen crust wherein volatile material is vented from the cell and contacted and ca |
| 6811676 |
Electrolytic cell for production of aluminum from alumina |
November 2, 2004 |
| An electrolytic cell for producing aluminum from alumina having a reservoir for collecting molten aluminum remote from the electrolysis. |
| 6800191 |
Electrolytic cell for producing aluminum employing planar anodes |
October 5, 2004 |
| A method of producing aluminum in an electrolytic cell containing alumina dissolved in an electrolyte, the method comprising providing a molten salt electrolyte having alumina dissolved therein in an electrolytic cell. A plurality of anodes and cathodes having planar surfaces are dispose |
| 6558525 |
Anode for use in aluminum producing electrolytic cell |
May 6, 2003 |
| A method of producing aluminum in an electrolytic cell containing alumina dissolved in an electrolyte, the method comprising the steps of providing a molten salt electrolyte at a temperature of less than 900.degree. C. having alumina dissolved therein in an electrolytic cell having a lin |
| 6468483 |
Process for treating alumina-bearing ores to recover metal values therefrom |
October 22, 2002 |
| A method for processing alumina-bearing ores such as bauxite to recover iron, aluminum, silicon and titanium metal values therefrom the method comprising the steps of adding the alumina-bearing ores to a digester containing an acid to provide a mixture of acid and alumina-bearing ores |
| 6248302 |
Process for treating red mud to recover metal values therefrom |
June 19, 2001 |
| A method for processing red mud to recover iron, aluminum, silicon and titanium metal values therefrom the method comprising the steps of adding the red mud to a digester containing an acid to provide a mixture of acid and red mud and heating the mixture to dissolve soluble compounds of |
| 6231822 |
Recovering chloride and sulfate compounds from spent potliner |
May 15, 2001 |
| A method of recovering chloride and sulfate salts from spent potliner using acid digestion. |
| 6217840 |
Production of fumed silica |
April 17, 2001 |
| A method for producing fumed silica and a fluorine-containing product from a source of silica in solid form and a solid material containing fluorine, the solid material selected from the group consisting of sodium aluminum tetrafluoride, cryolite, aluminum fluosilicate ammonium bifluorid |
| 6217836 |
Recovering carbon, silica and alumina from spent potliner |
April 17, 2001 |
| Spent potliner from aluminum reduction cells is treated, for example, with sulfuric acid to recover carbon, silica and alumina or to recover a vitrified product of silca and alumina. |
| 6193944 |
Method of recovering fumed silica from spent potliner |
February 27, 2001 |
| Spent potliner from an aluminum reduction cell is subject to an acid digest and the digest may be adjusted to produce a first gas component comprised of at least one material selected from the group consisting of silicon tetrafluoride, hydrogen fluoride, hydrogen cyanide gas and water va |
| 6187275 |
Recovery of AlF3 from spent potliner |
February 13, 2001 |
| A method of recovering AlF.sub.3 from spent potliner using an acid digest to form gaseous HF which is converted to hydrofluoric acid and reacted with alumina trihydrate to form AlF.sub.3. |
| 6123908 |
Method of treating spent potliner material from aluminum reduction cells |
September 26, 2000 |
| A process of treating spent potliner material from aluminum reduction cells and recovering useful products. In the process of the present invention, spent potliner material is introduced into an acid digester containing, for example, sulfuric acid. As a result of this step, a gas compone |
| 5955042 |
Method of treating spent potliner material from aluminum reduction cells |
September 21, 1999 |
| A process for treating spent potliner material from aluminum reduction cells and recovering useful products. In the process, spent potliner material is introduced into an acid digester containing, for example, sulfuric acid. A gas component is produced which includes hydrogen fluorid |
| 5723097 |
Method of treating spent potliner material from aluminum reduction cells |
March 3, 1998 |
| A method of treating spent potliner material from aluminum reduction cells is disclosed. The spent potliner material is introduced into a sulfuric acid digester to produce a gas component including hydrogen fluoride and hydrogen cyanide and a slurry component including carbon, silica, al |
