| Patents for C22B 11 - Obtaining noble metals (5,080) |
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| 02/12/1991 | CA1279995C Recovery of metals from their alloys with lead |
| 02/05/1991 | WO1991002097A1 Ion flotation with non-ionic reagents |
| 02/05/1991 | US4990639 Oxidation of rhodium complex to water insoluble carboxylic acid salt; solvent extraction |
| 02/05/1991 | CA2064560A1 Ion flotation with non-ionic reagents |
| 01/23/1991 | EP0305418B1 Process for recovering platinum group metals |
| 01/22/1991 | CA1279196C Process for purifying silver refinery slimes |
| 01/16/1991 | EP0408185A2 Recovery of gold from acidic solutions |
| 01/16/1991 | CN1048566A Disposal method of tailings water contained cn for a chlorinated gold extracting shop |
| 01/15/1991 | US4985216 Reduction roasting of metal ores |
| 01/02/1991 | CN1048238A Fragmentation dissolving method of noble metal |
| 12/27/1990 | EP0404327A1 Recovery of pure platinum and palladium |
| 12/25/1990 | US4979987 Precious metals recovery from refractory carbonate ores |
| 12/25/1990 | US4979986 Enhanced gold cyanide extraction |
| 12/20/1990 | WO1990015887A1 Dissolving values of platinum group metals from ores and concentrates |
| 12/20/1990 | CA2058969A1 Dissolving values of platinum group metals from ores and concentrates |
| 12/19/1990 | CN1047887A Recovery of metal values from ores |
| 12/11/1990 | US4976781 Mineral recovery process |
| 12/04/1990 | CA1277143C Process for the recovery of noble metals from ore- concentrates |
| 11/30/1990 | CA2016021A1 Process for recovery of precious metals from carbonaceous ores using chlorine dioxide |
| 11/21/1990 | CN1010485B Process for the pressure oxidation of acid leaching of non-ferrous metal and iron-containing sulphide |
| 11/20/1990 | US4971625 Method for leaching gold and/or silver out of ores or out of ore-concentrates and also out of precious-metal wastes or precious-metal scrap by using cyanide-containing leaching solutions |
| 11/17/1990 | CA2016640A1 Process for recovery of gold from refractory ores |
| 11/15/1990 | WO1990013678A1 Process and apparatus for the recovery of precious metals from slag, tailings and other materials |
| 11/14/1990 | CN1046942A Noble metal recovery |
| 11/06/1990 | US4968346 Nonexplosive, efficient |
| 10/29/1990 | WO1990013676A1 Recovery of gold and silver from complex refractory sulphide ores by cyanidisation and oxidation with peroxides |
| 10/27/1990 | WO1990012898A1 A method of recovering silver from photographic processing solutions |
| 10/27/1990 | CA2028847A1 Method of recovering silver from photographic processing solutions |
| 10/24/1990 | CN1046354A Noble metal recovery |
| 10/10/1990 | CN1045998A Treatment method for graphite anode in chlorine-soda industry |
| 10/09/1990 | US4961856 Contacting aqueous solution containing palladium with solution of substituted heterocyclic ring compound |
| 10/09/1990 | US4961777 Pretreatment/agglomeration as a vehicle for refractory ore treatment |
| 10/06/1990 | WO1990012119A1 Ion flotation with quaternary ammonium cationic surfactants |
| 10/06/1990 | CA2051097A1 Ion flotatin with quaternary ammonium cationic surfactants |
| 10/04/1990 | CA2013842A1 Manufacture of peroxides |
| 10/02/1990 | US4960573 Recovering method of catalytic component and carrier from waste catalyst |
| 10/02/1990 | US4960461 Method and installation for extracting gold from gold ore |
| 10/02/1990 | CA1274679A1 Vapor phase and surface contact rust preventive composition |
| 09/20/1990 | WO1990010721A1 Recovery of gold, silver and platinum group metals with various leachants at low pulp densities |
| 09/20/1990 | CA2045551A1 Recovery of gold, silver and platinum group metals with various leachants at low pulp densities |
| 09/18/1990 | CA1274065A1 Process for the manufacture of nitric oxide |
| 09/14/1990 | CA2012007A1 Activated carbon for recovery of gold |
| 09/11/1990 | US4955482 Screen cleaning in cil & cip systems |
| 08/23/1990 | WO1990009460A1 Chlorination process for recovering gold values from gold alloys |
| 08/16/1990 | WO1990009246A1 Air concentrator |
| 07/31/1990 | US4944927 Solvent extraction using acetic acid and water mixture |
| 07/26/1990 | WO1990007979A1 Regeneration of carbon |
| 07/18/1990 | EP0276215B1 Process for extracting precious metals from ore concentrates |
| 07/17/1990 | US4942565 Apparatus for recording a wobbling, spiral guide groove on an optical disc |
| 07/17/1990 | US4941917 Recovering gold by oxidation of organic carbon |
| 07/11/1990 | CN1008693B Catalyst recovery process |
| 06/20/1990 | CN1008447B Method of recovering noble metals from concentrated mineral |
| 06/13/1990 | CN1042947A Technological process of recovering of gold from lower grade goldmine |
| 05/29/1990 | US4929274 Solvent extraction, surfactants, gold and silver |
| 05/22/1990 | CA1269252A1 Using oxygen for leaching |
| 05/17/1990 | WO1990005114A1 Process for removal of soluble platinum group metal catalysts from liquid product mixtures |
| 05/15/1990 | US4925485 Process for the isolation of noble metals |
| 05/09/1990 | EP0367492A2 Process for removal of soluble platinum group metal catalysts from liquid product mixtures |
| 05/08/1990 | US4923510 Treatment of refractory carbonaceous sulfide ores for gold recovery |
| 05/03/1990 | WO1990004655A1 Cyanide recovery process |
| 05/02/1990 | EP0366334A1 Improvements in or relating to the recovery of silver |
| 04/30/1990 | CA2001432A1 Process for recovering gold from refractory sulfidic ores |
| 04/29/1990 | CA2001632A1 Prevention of copper dissolution during cyanidation of gold ores |
| 04/24/1990 | US4919715 With pure oxygen using a two stage fluidized bed |
| 04/20/1990 | CA2001064A1 Process for treatment of ores |
| 04/12/1990 | CA2000463A1 Metal recovery process |
| 04/11/1990 | EP0363314A1 Process and device for recovering catalyst constituents |
| 04/03/1990 | US4913736 Process for recovering platinum group metals |
| 04/03/1990 | US4913730 Recovery of gold from aqueous solutions |
| 04/03/1990 | US4913407 Precious metal recovery system |
| 03/14/1990 | EP0358004A2 Process for leaching noble metals using cyanidic solutions with hydrogen peroxide |
| 02/20/1990 | US4902345 Peroxidation; thiourea leaching |
| 02/13/1990 | US4900520 Process for removal of soluble platinum group metal catalysts from liquid product mixtures |
| 02/13/1990 | US4900430 Screen cleaning in CIL and CIP systems |
| 02/07/1990 | CN1006722B Gold recovery process |
| 02/06/1990 | US4898611 Heap leaching |
| 01/24/1990 | CN1006555B Recovery of gold from refractory auriferous iron-containing sulphidic concentrate |
| 01/23/1990 | US4895597 Recovery of precious metals |
| 01/23/1990 | US4895596 Reduction, precipitation |
| 01/11/1990 | WO1990000206A1 Method of treating cyanide pulp |
| 01/09/1990 | US4892631 Recovery of precious metals from complex ores |
| 01/02/1990 | US4891060 Process for the recovery of gold using plasma |
| 12/28/1989 | WO1989012699A1 Hydrometallurgical recovery of gold |
| 12/28/1989 | DE3920144A1 Orbital umgelagerte, monoatomare elemente, verfahrenzu ihrer herstellung und ihre weiterverarbeitung Orbital rearranged monoatomic, elements, verfahrenzu their production and their further processing |
| 12/27/1989 | CN1006233B Purifying method |
| 12/05/1989 | US4885143 Method for the interseparation of platinum group metals |
| 11/28/1989 | CA1263365A1 Catalyst recovery process |
| 11/21/1989 | US4881973 Life silver recovery system |
| 11/21/1989 | CA1263098A1 Gold recovery processes |
| 11/14/1989 | CA1262827A1 Pressurized reaction of refractory ores with heat recovery |
| 11/07/1989 | US4878945 Hydrometallurgical process for treating refractory ores containing precious metals |
| 11/02/1989 | EP0339230A1 Process for the detoxification of effluents from ore processing operations with hydrogen peroxide, using a magnetic pre-separation stage |
| 10/25/1989 | EP0338990A2 Process for desilverising fixing baths containing iodide |
| 10/19/1989 | WO1989009837A1 Noble metal recovery process |
| 10/17/1989 | US4874486 Pyrolysis; electrolysis of slag; separation |
| 10/17/1989 | US4874429 Hydrometallurgical process for the recovery of silver from copper electrolysis anode sludge |
| 10/11/1989 | CN1036189A Process for recovery of platinum catalyst |
| 10/03/1989 | CA1262050A1 Process for extracting gold by decomposition of lead cyanide compound |
| 09/27/1989 | CN1035851A Solvent extraction process |
| 09/19/1989 | US4868120 Method of recovering both silver and a base for sensitive materials from sensitive materials by utilizing micro-organisms |