| Patents for C22B 4 - Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys (1,486) |
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| 06/14/1994 | US5320666 Exposing ore to reduced pressure to volatilize contaminants, removing decontaminated ore |
| 06/08/1994 | CN1087684A Method for smelting duriron with raw coal |
| 05/26/1994 | WO1994011538A1 Process for remediation of lead-contaminated soil and waste battery casings |
| 05/26/1994 | CA2124005A1 Method for remediation of lead-contaminated soil and waste battery casings |
| 05/10/1994 | CA1329325C Method of recovering copper and a furnace for carrying out the method |
| 05/03/1994 | US5308375 Process for recovery of free aluminum from aluminum dross or aluminum scrap using plasma energy with oxygen second stage treatment |
| 04/26/1994 | US5305817 Stream of ionized inert gas with entrained solids injected into base metal bath; continuous agitation |
| 03/16/1994 | CN1024024C Smelting process of alloyes of boron-silicon-iron and boron-iron |
| 02/08/1994 | US5284503 Process for remediation of lead-contaminated soil and waste battery |
| 02/08/1994 | CA1326838C Process for the addition of metal elements into metal melts |
| 02/01/1994 | US5282880 Low pressure plasma metal extraction |
| 01/05/1994 | CN1080325A Method for producing easily volatile metals, such as zinc, lead and cadmium, of sulphidic raw materials |
| 12/29/1993 | EP0576255A1 Process for recovery of free aluminium from aluminium dross or aluminium scrap using plasma energy with oxygen second stage treatment |
| 12/01/1993 | EP0571605A1 Vacuum processing of particulate reactive metal |
| 11/24/1993 | EP0570942A1 Method for producing easily volatile metals, such as zinc, lead and cadmium, of sulfidic raw materials |
| 09/14/1993 | US5244488 Direct smelting process with a thermal plasma |
| 07/27/1993 | CA2024076C Plasma reactor for material processing at very high temperatures |
| 06/24/1993 | WO1993012261A1 Vacuum processing of particulate reactive metal |
| 06/23/1993 | EP0366701B1 Magnesium production |
| 06/17/1993 | CA2084220A1 Vacuum processing of particulate reactive metal |
| 04/21/1993 | CN1071205A Process for preparation of rareearth ferro-silicon alloy by carbon thermal reduction to ore bearing O,C and Ce |
| 03/16/1993 | US5194237 Reaction of molten titanium alloy or titanium/auxiliary metal blend with carbon, dispersion of titanium carbide crystals in metallic matrix |
| 02/23/1993 | US5188658 Cracking the agglomerates of carbonaceous binder and zinc oxide dust furnace to form slag phase, liquid metal phase and gas phase by condensation |
| 01/27/1993 | CN1068370A Opening method of ore-smelting furnace |
| 12/15/1992 | US5171358 Apparatus for producing solidified metals of high cleanliness |
| 12/15/1992 | US5171357 Water-cooled shields to intercept impure metals ejected by explosive vaporization; inclusion |
| 12/02/1992 | CN1066687A Alsifer smelting from ores directly |
| 11/11/1992 | CN1066088A Improved heater arrangement for aluminum refining systems |
| 11/03/1992 | US5160533 Reaction of nitrogen gas with aluminum to form nitride on surface |
| 10/28/1992 | EP0510701A2 Improved heater arrangement for aluminum refining systems |
| 09/23/1992 | CN1064707A Process for smelting high-gade si-ca-ba alloy in mineral fuel furnace |
| 09/22/1992 | US5150272 Stabilized electromagnetic levitator and method |
| 09/17/1992 | WO1992015716A1 Methods and pneumo-gravitational separation apparatus for extracting mineral values from particulate materials |
| 09/17/1992 | WO1992015715A1 Methods and apparatus for extracting mineral values from particulate materials |
| 09/17/1992 | WO1992015714A1 Methods and chemo-thermal reactor apparatus for extracting mineral values from particulate materials |
| 09/15/1992 | US5147451 Method for refining reactive and refractory metals |
| 08/04/1992 | US5135565 Introdocing dross and lime flux into furnance, melting, separating upper aluminum layer |
| 07/15/1992 | CN1062769A Method and apparatus for production of metal base composite material |
| 06/16/1992 | CA1303330C Process for recovering elemental phosphorus and a metal concentrate from ferrophos |
| 06/10/1992 | CN1016971B Method and apparatus for carrying out thermochemical process |
| 06/09/1992 | US5120027 Oxidation and corrosion resistance heating elements |
| 06/09/1992 | CA1302714C Apparatus and method for treating metallic fines |
| 05/19/1992 | US5114467 Method for manufacturing magnetostrictive materials |
| 03/20/1992 | CA2051605A1 Method and apparatus for production of metal base composite material |
| 03/18/1992 | EP0475576A1 Silicon smelting process in direct current furnace |
| 03/17/1992 | CA1297301C Method for treatment of dust recovered from off gases in metallurgical processes |
| 02/26/1992 | EP0471816A1 Process for recovering heavy metals from spent catalysts |
| 02/25/1992 | US5090996 Reducing calcined dolomite or magnesium oxide with ferro-silicon; heating with plasma or arc |
| 02/14/1992 | CA2047278A1 Silicon smelting process in direct current furnace |
| 12/27/1991 | EP0259459B1 Powder atomizing methods and apparatus |
| 09/02/1991 | WO1991013179A1 Process for recovering valuable metals from spent catalysts |
| 08/14/1991 | EP0441052A1 Method for recovering zinc from zinc-containing waste materials |
| 08/14/1991 | EP0440711A1 Method of producing titanium |
| 08/08/1991 | WO1991011658A1 Destroying waste using plasma |
| 07/31/1991 | CN1053450A Formula for producing silica-alumina iron by use of ore-heating method and production process thereof |
| 06/23/1991 | CA2032554A1 Method for recovering zinc from zinc-containing waste materials |
| 05/23/1991 | DE3922131A1 Electric furnace power supply control |
| 05/21/1991 | US5017754 Plasma reactor used to treat powder material at very high temperatures |
| 05/08/1991 | EP0425525A1 Method for grain refining of metals |
| 05/07/1991 | US5013533 Process for recovering valuable metals from spent catalysts |
| 04/23/1991 | US5009703 Silicon smelting process in direct current furnace |
| 04/23/1991 | US5009397 Plant to be used for metallurgical treatments of metal compounds and/or metal alloys or for producing calcium carbide |
| 03/20/1991 | EP0417296A1 Direct smelting process |
| 03/20/1991 | CN1050046A Smelting process of alloyes of boron-silicon-iron and boron-iron |
| 03/19/1991 | CA1281553C Electrothermal preparation and refining process of metals derived from scrap,and related installation |
| 03/06/1991 | EP0415858A2 Plasma reactor for high-temperature treatment of materials |
| 02/05/1991 | US4990179 Heating plasma furnace to increase the solubility of carbon in the melts |
| 02/05/1991 | US4989522 Separation, combustion using plasma arc |
| 01/30/1991 | CN1048890A Apparatus for extracting metallic lead from lead sulfide concentrate |
| 01/15/1991 | US4985067 Process and device for implementing hot chemical processes |
| 01/10/1991 | DE3920522A1 Plant for extracting metallic lead from sulphidic concentrate - has divided chamber with ratio of electrothermic section area to that of vessel, to increase extraction and reduce energy use |
| 01/02/1991 | CA1278431C Thermal production of magnesium |
| 01/01/1991 | US4982410 Plasma arc furnace with variable path transferred arc |
| 12/26/1990 | CN1048067A Process for producing ferrous alloy containing barium and silicon |
| 11/13/1990 | CA1276072C Process for producing niobium metal of an ultrahigh purity |
| 11/07/1990 | CN1046762A Method for smelting si-al alloy with coal gangue |
| 10/30/1990 | US4966624 Method and apparatus for electric refining of lead |
| 10/24/1990 | EP0394214A1 Plants to be used for metallurgical treatments of metals, metal compounds and/or metal alloys or for producing calcium carbide |
| 10/23/1990 | US4964973 Method and apparatus for producing titanium |
| 10/13/1990 | CA2013780A1 Plant to be used for metallurgical treatments of metal compounds and/or metal alloys for producing calcium carbide |
| 09/26/1990 | CN1045606A Products and process obtaining silicon-aluminium alloy from waste slog powder |
| 09/25/1990 | CA1274564A1 Alloying system |
| 08/08/1990 | CN1044501A Method and apparatus for mfg. high-grade nickel matte |
| 07/27/1990 | WO1990008843A1 Direct smelting process |
| 07/10/1990 | US4940486 Direct current, plasma, electron flow, refining, alloying |
| 05/09/1990 | EP0366701A1 Magnesium production. |
| 05/03/1990 | WO1990004043A3 Method of producing titanium |
| 04/19/1990 | WO1990004043A2 Method of producing titanium |
| 04/11/1990 | EP0362253A1 Process for treating liquid metals |
| 01/23/1990 | CA1264544A1 Ceramic filter and method for using same |
| 01/17/1990 | EP0350542A1 Process for recovering elemental phosphorus and a metal concentrate from ferrophos |
| 01/11/1990 | WO1990000205A1 Method for grain refining of metals |
| 01/02/1990 | US4891060 Process for the recovery of gold using plasma |
| 11/28/1989 | US4883258 Plasma furnace |
| 10/24/1989 | US4875985 Method and appparatus for producing titanium |
| 08/23/1989 | CN1034959A Making process for si-ba alloy |
| 07/19/1989 | CN1034023A Process for recovery of gold |
| 06/20/1989 | CA1336478B Recovery of Non-Ferrous Metals from Dross |
| 04/27/1989 | DE3816697C1 Process for recovering rare metals |
| 04/12/1989 | CN1003865B Smelting of rare earth fine ore briquettes (or lumps) to prepare rare earth fine slag and niobium ferric phosphorate |