| Patents for C22B 5 - General processes of reducing to metals (5,378) |
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| 02/20/1992 | WO1992002648A1 Method of extracting valuable metals from leach residues |
| 02/12/1992 | EP0470376A1 Rare earth/iron fluoride and methods for making and using same |
| 02/02/1992 | WO1992002647A1 Process for controlling the product quality in the conversion of reactor feed into iron carbide |
| 02/02/1992 | WO1992002646A1 Process for preheating iron-containing reactor feed prior to being treated in a fluidized bed reactor |
| 02/02/1992 | CA2087601A1 Process for controlling the product quality in the conversion of reactor feed into iron carbide |
| 01/30/1992 | DE4110324C1 Pressing of tin plate scrap - involves immersion in molten sodium followed by electrolysis avoiding waste water contamination |
| 01/18/1992 | CA2045974A1 Rare earth/iron fluoride and methods for making and using same |
| 01/15/1992 | CN1015295B Rare earth alloy powder and process for producing the same |
| 01/14/1992 | CA1294132C Method and apparatus for the pyrometallurgical treatment of finelydivided materials |
| 01/14/1992 | CA1294131C Process for reduction smelting of materials containing base metals |
| 01/08/1992 | CN1057678A Process for producing high-quality niobium-iron alloy from concentrated niobite |
| 12/18/1991 | CN1015113B Method for production of metal or ferroalloys by direct reduction and pre-reduction column thereby |
| 12/17/1991 | US5073337 Rare earth/iron fluoride and methods for making and using same |
| 12/17/1991 | US5073252 Pneumatic size separator for nickle-containing particles |
| 12/17/1991 | US5073194 Process for controlling the product quality in the conversion of reactor feed into iron carbide |
| 11/20/1991 | CN1056315A Method for smelting silicon-aluminium alloy with ore in ore hearth |
| 11/20/1991 | CN1014804B Process for treatment of ores or concentrates of lead sulfuride and/or lead-zinc sulfuride |
| 11/19/1991 | US5065985 Method for smelting reduction of iron ore and apparatus therefor |
| 11/13/1991 | EP0220198B1 Preparing metal compounds by pyrolysis |
| 11/12/1991 | US5064467 Method and apparatus for the direct reduction of iron |
| 10/30/1991 | CN1055763A Process for producing metals and metal alloys in smelt reduction vessel |
| 10/29/1991 | US5061313 Single-phase, homogeneous, high surface area |
| 10/15/1991 | US5058126 Silicon carbide beam as refractory in an open-arc furnace |
| 10/09/1991 | EP0449890A1 Process for the production of metals, alloys and ceramic materials. |
| 09/24/1991 | CA1289364C Method for melting and reducing chrome ore |
| 09/19/1991 | WO1991014005A1 A process for producing metals and metal alloys in a smelt reduction vessel |
| 09/18/1991 | EP0446860A1 A process for producing metals and metal alloys in a smelt reduction vessel |
| 09/11/1991 | CN1054502A 稀土合金 Rare earth alloy |
| 09/11/1991 | CN1054446A Prereduction furnace of smelting reduction facility of iron ore |
| 09/05/1991 | WO1991013180A1 Production of synthetic rutile |
| 09/04/1991 | EP0444614A2 Prereduction furnace of a smelting reduction facility of iron ore |
| 08/23/1991 | WO1991013182A1 Deoxidation of a refractory metal |
| 08/23/1991 | CA2075922A1 Deoxidation of a refractory metal |
| 08/08/1991 | DE4002876A1 Cyclone smelting process esp. for ore concentrates - using carrier gas to transport solids and enhance vortex in cyclone |
| 08/06/1991 | US5037608 Method for making a light metal-rare earth metal alloy |
| 07/31/1991 | CN1053450A Formula for producing silica-alumina iron by use of ore-heating method and production process thereof |
| 07/30/1991 | US5035742 Reduced chromium-ore bearing powder and method for producing the same |
| 07/30/1991 | US5035404 Retort assembly for kroll reductions |
| 07/30/1991 | CA1286896C Tantalum powder process |
| 07/23/1991 | CA1286507C Process for the preparation of the lithiothermy of powdered metals |
| 07/17/1991 | EP0436718A1 Method of charging ore in melt-reduction |
| 07/16/1991 | US5032372 For oxidic metallic ores |
| 07/09/1991 | CA1285792C Process for preparing finely divided metal powders |
| 07/03/1991 | CN1013055B Apparatus for the pyrometallurgical processing of fine-grained solids to make molten products |
| 06/11/1991 | US5022935 With a metal, heating to liquify deoxidant, cooling, purification of surface |
| 05/30/1991 | WO1991005881A3 A method for removing chromium from chromium containing waste material |
| 05/22/1991 | CN1051588A Ferrovanadium slag depletion agent and application thereof |
| 05/15/1991 | EP0427710A1 Smelting reduction |
| 05/08/1991 | EP0426375A1 Method for producing high-purity metallic chromium |
| 05/07/1991 | US5013355 From sulfidic ores, flame smelting |
| 05/02/1991 | WO1991005881A2 A method for removing chromium from chromium containing waste material |
| 05/02/1991 | WO1991005879A1 Smelting of nickel laterite and other iron containing nickel oxide materials |
| 04/23/1991 | CA1283296C Mixed binder systems for agglomerates |
| 04/17/1991 | EP0422309A1 Shaftfurnace for the reduction of iron ore with hydrogen to metallized iron powder for sintering |
| 04/16/1991 | US5007960 Drying, sizing, mixing with alkali, heating in the presence of oxygen, extracting water soluble chromate, evaporating |
| 04/16/1991 | CA1282965C Zinc recovery from furnace dust |
| 03/26/1991 | CA1281907C Metallurgical composites and processes |
| 03/20/1991 | EP0417757A1 Process for producing copper fine powder |
| 03/20/1991 | EP0417296A1 Direct smelting process |
| 03/19/1991 | US5000784 Method for smelting reduction of iron ore |
| 03/06/1991 | CN1011894B Method and equipment for producing iron alloy |
| 02/25/1991 | WO1991002824A1 Smelting of metallurgical waste materials containing iron compounds and toxic elements |
| 02/19/1991 | CA1280288C2 Multi-purpose pyrometallurgical process enhancing device |
| 02/12/1991 | CA1280014C Process for producing the rare earth alloy powders |
| 02/12/1991 | CA1279995C Recovery of metals from their alloys with lead |
| 01/15/1991 | US4985068 Recovery of waste gases, natural gas fuel |
| 01/15/1991 | US4985067 Process and device for implementing hot chemical processes |
| 01/09/1991 | CN1011143B Metallurgical composites and processes |
| 01/02/1991 | CA1278431C Thermal production of magnesium |
| 01/01/1991 | US4981510 Process and apparatus for the production of ferrochromium |
| 12/19/1990 | EP0402738A2 Nickel foam |
| 12/18/1990 | CA1277840C Method for continuous reduction of molten metallurgical slag in an electric furnace |
| 12/13/1990 | WO1990015162A1 Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 12/13/1990 | CA2047188A1 Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 12/12/1990 | CN1047701A Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 12/11/1990 | US4976776 Preheating and prereducing using recirculated hot gases; energy efficient |
| 12/04/1990 | US4975116 Method for production of metals of ferroalloys by direct reduction |
| 11/21/1990 | CN1047109A Process for smelting reduction of cr materials, and smelting reduction furnace therefor |
| 11/20/1990 | US4971622 Sulphur and silicon control in ferrochromium production |
| 11/07/1990 | CN1010325B Process and apparatus for recovering metal and metal alloy |
| 11/06/1990 | CA1275831C Zirconium and hafnium with low oxygen and iron |
| 11/06/1990 | CA1275811C Process for producing high purity zirconium and hafnium |
| 10/09/1990 | US4961784 Blowing inert gas from bottom and side and oxygen from top to decarburize reduced ores |
| 09/18/1990 | US4957543 Nickel carbonyl decomposition on open-cell decomposable foam structure, sintering |
| 09/13/1990 | DE4007835A1 Ore suspension smelting furnace - comprising side nozzles directed upwards to cause turbulence with flow from concentrate burner at top of shaft |
| 09/05/1990 | CN1045129A Method for smelting reduction of ni ore |
| 09/05/1990 | CN1009464B Combined smoke furnace |
| 09/04/1990 | US4954169 Agglomerates |
| 08/08/1990 | CN1044501A Method and apparatus for mfg. high-grade nickel matte |
| 07/31/1990 | CA1272020A1 Apparatus for the pyrometallurgical processing of fine-grained solids to make molten products |
| 07/27/1990 | WO1990008843A1 Direct smelting process |
| 07/18/1990 | EP0129555B1 Process and apparatus for obtaining silicon |
| 07/17/1990 | US4941916 Sublimation |
| 06/28/1990 | WO1990007012A1 Process for the production of metals, alloys and ceramic materials |
| 06/27/1990 | CN1008542B Method for manufacturing mo-iron from mo ore |
| 06/22/1990 | CA2006402A1 Process for the production of metals, alloys and ceramic materials |
| 06/19/1990 | US4935054 Through a chute to mouth of furnace |
| 06/12/1990 | US4933003 Single phase, homogeneous and high surface area |
| 05/09/1990 | EP0366701A1 Magnesium production. |
| 05/09/1990 | CN1007923B Apparatus for producing ignitable solids-gas suspensions |