| Patents for C22B - Production or refining of metals; Pretreatment of raw materials (459) |
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| 04/25/2002 | WO2002033135A1 Precious metal scavenging from a liquid medium with a functionalised polymer fiber |
| 04/11/2002 | US20020041840 Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores |
| 04/02/2002 | US6364931 Hydrochloric acid solution of actual feedstocks; no prior separation required; ion-exchange gel chromatography |
| 03/14/2002 | US20020031463 Adding solid or freshly slurried caustic calcined magnesium oxide to the solution to precipitate nickel and cobalt and minor amount of manganese in solution, maintaining magnesium oxide in solution for prefered time, separating precipitates |
| 03/06/2002 | CN1080319C Tantalum powder without metals and fluorine and alkali |
| 02/05/2002 | US6344068 Process for recovering gold from thiosulfate leach solutions and slurries with ion exchange resin |
| 01/22/2002 | CA2202289C Recovery of zinc from sulphidic concentrates |
| 01/17/2002 | US20020006370 Using sulfuric acid; high temperature, high pressure |
| 11/22/2001 | WO2001088212A2 Method for thiosulfate leaching of precious metal-containing materials |
| 11/22/2001 | WO2001032944B1 Method for leaching nickeliferous oxide ores of high and low magnesium laterites |
| 11/22/2001 | CA2756715A1 Method for thiosulfate leaching of precious metal-containing materials |
| 11/22/2001 | CA2745928A1 Method for thiosulfate leaching of precious metal-containing materials |
| 11/22/2001 | CA2745806A1 Method for thiosulfate leaching of precious metal-containing materials |
| 11/22/2001 | CA2698578A1 Method for thiosulfate leaching of precious metal-containing materials |
| 11/13/2001 | US6315812 Subjecting host material to an oxidative pressure sulfuric acid leach process in the presence of a chloride salt, and at 210-230 degrees c.; solution has an acid strength of at least 1 g/l, to form a precious metal-bearing chloride complex |
| 10/24/2001 | CA2344129A1 Assaying and/or recovering precious metals |
| 10/04/2001 | EP0964936B1 Tantalum powder, method for producing same powder and sintered anodes obtained from it |
| 09/27/2001 | WO2001032943A3 Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores |
| 08/08/2001 | EP1019551B1 Separation of platinum group metals |
| 07/17/2001 | US6261527 Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores |
| 07/04/2001 | EP1112389A1 Process for recovery of gold and/or silver |
| 05/10/2001 | WO2001032944A1 Method for leaching nickeliferous oxide ores of high and low magnesium laterites |
| 05/10/2001 | WO2001032943A2 Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores |
| 05/10/2001 | CA2389653A1 Method for leaching nickeliferous laterite ores |
| 05/10/2001 | CA2389635A1 Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores |
| 04/05/2001 | WO2001023628A1 Stable ferric arsenate precipitation from acid copper solutions whilst minimising copper losses |
| 03/14/2001 | CN1063229C Method for recovering nickel hydrometallurgically from two different nickel mattes |
| 02/27/2001 | US6193779 Tantalum powder that is free of alkali and fluorine |
| 08/22/2000 | US6107065 Forming a concentrate of sulfide minerals from ore, coating onto coarse substrates, forming a heap with bacteria, and biooxidizing the mineral on the surface at a rate at least two times greater than average |
| 07/19/2000 | EP1019551A1 Separation of platinum group metals |
| 07/18/2000 | US6090341 Gold is extracted from the ore and dissolved in a chemical solution to form a gold complex. complex is reduced to gold from the solution |
| 05/02/2000 | CA2138777C Production of metals from minerals |
| 04/25/2000 | US6054105 Process for the solvent extraction of nickel and cobalt values in the presence of magnesium ions from a solution |
| 03/21/2000 | US6039790 Leaching using nickel sulfate and sulfuric acid, reducing to nickel metal, leaching an iron bearing solution after acidifying to form nickel sulfate, using formed nickel sulfate solution as leaching solution |
| 03/15/2000 | CN1247575A Tantalum powder, method for producing same powder and sintered anodes obtained from it |
| 12/22/1999 | EP0964936A1 Tantalum powder, method for producing same powder and sintered anodes obtained from it |
| 09/15/1999 | EP0646185B1 Production of metals from minerals |
| 09/10/1999 | WO1999045158A1 Gold recovery process |
| 09/07/1999 | US5948140 Complexing with sodium or potassium halides and calcium orbarium halides; reduction or electrodeposition |
| 06/23/1999 | CN1220319A Improved beta-diketones for extraction of copper from aqueous ammoniacal solutions |
| 06/17/1999 | CA2243925A1 Improved beta-diketones for the extraction of copper from aqueous ammoniacal solutions |
| 04/07/1999 | EP0906962A1 Interseparation of platinum group metals |
| 03/25/1999 | WO1999014385A1 Separation of platinum group metals |
| 03/24/1999 | EP0804624B1 Chloride assisted hydrometallurgical copper extraction |
| 03/18/1999 | WO1999013116A1 Process for recovery of gold and/or silver |
| 03/18/1999 | CA2342899A1 Process for recovery of gold and/or silver |
| 03/09/1999 | US5879644 Interseparation of platinum group metals |
| 02/11/1999 | WO1999006603A1 Selective precipitation of nickel and cobalt |
| 01/14/1999 | CA2243012A1 Reduction of ph modifying agent in the flotation of copper minerals |
| 12/08/1998 | CA1340169C Hydrometallurgical process for extracting gold and silver ores with bromate/perbromide solutions and compositions therefor |
| 09/29/1998 | CA2014667C Alkylene oxide catalysts having enhanced activity and/or stability |
| 09/09/1998 | CN1192785A Method for recovering nickel hydrometallurgically from two different nickel mattes |
| 09/08/1998 | US5803947 Method of producing metallic magnesium, magnesium oxide or a refractory material |
| 08/27/1998 | WO1998037248A1 Tantalum powder, method for producing same powder and sintered anodes obtained from it |
| 05/13/1998 | CN1038348C Prodn. of metal from minerals |
| 03/04/1998 | EP0668935B1 A method of producing metallic magnesium, magnesium oxide or a refractory material |
| 02/12/1998 | WO1998005569A1 Gold extraction from ores with chemicals regeneration |
| 12/25/1997 | CA2208665A1 Method and system for extracting and refining gold from ores |
| 11/05/1997 | EP0804624A1 Chloride assisted hydrometallurgical copper extraction |
| 10/07/1997 | US5673900 Reclamation of metal from scrap |
| 07/29/1997 | US5651947 Recovery of zinc from sulphidic concentrates |
| 07/23/1997 | EP0784709A1 Recovery of zinc from sulphidic concentrates |
| 07/08/1997 | US5645708 Chloride assisted hydrometallurgical copper extraction |
| 02/27/1997 | WO1997007250A1 Fluorocarbon fluids as gas carriers to aid in precious and base metal heap leaching operations |
| 02/27/1997 | WO1997007248A1 Method for recovering nickel hydrometallurgically from two different nickel mattes |
| 02/27/1997 | CA2227581A1 Fluorocarbon fluids as gas carriers to aid in precious and base metal heap leaching operations |
| 02/18/1997 | US5603750 Fluorocarbon fluids as gas carriers to aid in precious and base metal heap leaching operations |
| 01/29/1997 | EP0756013A1 Interseparation of platinum group metals |
| 01/15/1997 | CN1033823C Improved heater arrangement for aluminium refining systems |
| 12/17/1996 | US5585079 Dissolving zinc ferrite and zinc oxide in sulfuric acid without dissolving the zinc silicate, reducing silicate residue with coal in furnace to produce iron silicate slag |
| 12/03/1996 | CA2008167C Method and apparatus for manufacturing high-grade nickel matte |
| 06/27/1996 | WO1996019593A1 Chloride assisted hydrometallurgical copper extraction |
| 05/17/1996 | WO1996014438A1 Recovery of zinc from sulphidic concentrates |
| 05/15/1996 | EP0665900B1 Production of metallic cobalt powder |
| 04/17/1996 | EP0538278B1 Reclamation of metal from scrap |
| 04/02/1996 | US5504053 Silver metal impregnated on inert refractory solid support, also containing manganese and promoter compound of alkali or alkaline earth metal, sulfate and/or molybdate |
| 02/28/1996 | CN1117473A Chemical reacting tank for obtaining metal and salt |
| 02/21/1996 | EP0449890B1 Process for the production of metals, alloys and ceramic materials |
| 01/30/1996 | US5487819 Production of metals from minerals |
| 12/12/1995 | CA2067054C Heater arrangement for aluminum refining systems |
| 12/12/1995 | CA1337722C Alkylene oxide catalysts having enhanced activity and/or stability |
| 09/26/1995 | US5453253 Reacting with concentrate of zinc sulfide in dilute sulfuric acid; suspending, flashing, separation, leaching, and electrolysis |
| 09/26/1995 | CA2006351C Purifying molten metal |
| 08/30/1995 | EP0668935A1 A method of producing metallic magnesium, magnesium oxide or a refractory material |
| 08/09/1995 | EP0665900A1 Production of metallic cobalt powder. |
| 07/11/1995 | US5431788 Chloride assisted hydrometallurgical copper extraction |
| 04/05/1995 | EP0646185A1 Production of metals from minerals |
| 03/22/1995 | CN1027978C Method and apparatus for manufacturing of high-grade nickel matte |
| 01/11/1995 | CN1027349C Alumina particles |
| 10/11/1994 | CA1332404C Alumina particles |
| 08/24/1994 | CN1091157A Production of metal from minerals |
| 07/12/1994 | US5328501 Reduction of metal compounds to form metals |
| 05/26/1994 | WO1994011539A1 A method of producing metallic magnesium, magnesium oxide or a refractory material |
| 05/11/1994 | WO1994010350A1 Production of metallic cobalt powder |
| 03/08/1994 | CA1327452C Separation of nickel from copper in autoclave |
| 03/01/1994 | CA1327273C Recovery of refractory gold using a combination omli process - roasting - cyanidation method |
| 01/06/1994 | WO1994000606A1 Production of metals from minerals |
| 09/21/1993 | US5246481 Production of metallic powder |
| 08/03/1993 | US5232488 Cooling, mixing with sodium thiocyanate solution with activated carbon producing tailings, filtration, collecting condensates, filtrates and tailings, combining to form slime then refining |
| 07/20/1993 | US5229003 Recovery of base materials from geothermal brines |