| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 01/22/1991 | US4986742 Extraction of titanyl sulfate with an organophosphorus compound |
| 01/22/1991 | CA2063989A1 Method of making metal stannates |
| 01/22/1991 | CA1279197C Cobalt recovery method |
| 01/22/1991 | CA1279196C Process for purifying silver refinery slimes |
| 01/22/1991 | CA1279195C Purification process for aqueous solutions of rare earth salts through liquid-liquid extraction |
| 01/19/1991 | CA2021415A1 Recovery of rare earth elements from sulphurous acid solution by solvent extraction |
| 01/16/1991 | EP0408203A2 Heterocyclic thione |
| 01/16/1991 | EP0408185A2 Recovery of gold from acidic solutions |
| 01/16/1991 | CN1048564A Ionic type rare earth ore in-situ lixiviation processing |
| 01/14/1991 | WO1991000931A1 Method for the recovery of zinc, copper and lead of oxidized and/or sulfurized ores and materials |
| 01/14/1991 | CA2036379A1 Method for the recovery of zinc, copper and lead of oxidized and/or sulfurized ores and materials |
| 01/13/1991 | CA2020846A1 Heterocyclic thione |
| 01/10/1991 | WO1991000369A1 Biodegradation and recovery of gallium and other metal from integrated circuits |
| 01/09/1991 | EP0406389A1 Method and device for separating mercury from an aqueous medium |
| 01/02/1991 | CN1048238A Fragmentation dissolving method of noble metal |
| 12/27/1990 | EP0404327A1 Recovery of pure platinum and palladium |
| 12/25/1990 | US4980134 Leaching process |
| 12/25/1990 | US4980071 Substituted thioureas for the separation of complexly bound heavy-metal ions |
| 12/25/1990 | US4979985 Process for making finely divided particles of silver metal |
| 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 |
| 12/18/1990 | US4978788 Copper as perchlorate using o-hydroxyaryloximes and branched aliphatic or aromatic alcohols or esters |
| 12/12/1990 | CN1047700A Obtaining lanthanides by extraction and separation of solvent |
| 12/11/1990 | CA1277479C Process for purifying alumina |
| 12/05/1990 | EP0400311A2 Metal recovery with monothiophosphinic acids |
| 12/05/1990 | CN1047534A Fractional distillation extraction gadolinium, terbium, dysprosium, yttrium clustering method |
| 12/04/1990 | US4975253 Solvent extraction of nickel using hydroxamic acids |
| 12/04/1990 | US4974816 Controlling oxidation |
| 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 |
| 11/29/1990 | DE4010778A1 Selective removal of cadmium from wet process phosphoric acid |
| 11/28/1990 | EP0399521A2 Process for extracting cadmium-ions from wet process phosphoric acid |
| 11/28/1990 | CN1047346A Cl-carrier chlorination process for extracting au and ag |
| 11/28/1990 | CN1010595B Extract ga from bar solution using soaking and adsorbing resin |
| 11/21/1990 | CN1010485B Process for the pressure oxidation of acid leaching of non-ferrous metal and iron-containing sulphide |
| 11/20/1990 | US4971662 Hydrometallurgical recovery of metal values from cooper containing sulphide materials |
| 11/17/1990 | CA2016640A1 Process for recovery of gold from refractory ores |
| 11/15/1990 | WO1990013675A1 Process for two-phase extraction of metallic ions from phases containing solid metallic oxides, agent and use |
| 11/14/1990 | CN1046943A Reductin medium for silver recovery bucket |
| 11/14/1990 | CN1046942A Noble metal recovery |
| 11/07/1990 | CN1046761A Wet smelting zinc |
| 11/06/1990 | US4968434 Recovering rare earth compounds from phosphoric acid solutions |
| 11/06/1990 | US4968346 Nonexplosive, efficient |
| 11/06/1990 | US4968008 Bioleaching apparatus and system |
| 10/30/1990 | USRE33410 Liquid-liquid extraction of germanium from aqueous solution using hydroxy-oximes |
| 10/30/1990 | US4966997 Metal extractants, microorganism growth promoter |
| 10/30/1990 | US4966760 Method for recovering chromium from chromium-bearing material |
| 10/29/1990 | WO1990013677A1 Process for recovering germanium |
| 10/29/1990 | WO1990013676A1 Recovery of gold and silver from complex refractory sulphide ores by cyanidisation and oxidation with peroxides |
| 10/24/1990 | EP0393287A1 Process for treating scrap containing rare earth and cobalt |
| 10/23/1990 | US4964997 Dissolving residue with nitric acid, extracting with water-insoluble neutral organophosphoric extractant |
| 10/23/1990 | US4964996 Liquid/liquid extraction of rare earth/cobalt values |
| 10/23/1990 | US4964622 Leaching vessel and slurry flow control |
| 10/18/1990 | WO1990012121A1 Method of extracting iron from a pulp containing compounds of heavy non-ferrous metals |
| 10/18/1990 | WO1990012120A1 Method of extracting iron from a pulp containing compounds of heavy non-ferrous metals |
| 10/16/1990 | US4963264 Process for selective dialysis using polymeric affinity adsorbents and size selective membranes |
| 10/10/1990 | EP0390875A1 Process for separating antimony from acidic solutions containing same. |
| 10/10/1990 | EP0355159A4 Mixing-settling apparatus for liquid-liquid extraction |
| 10/09/1990 | US4961910 As oxides; digestion with hydrochloric acid or sulfuric acid |
| 10/09/1990 | US4961856 Contacting aqueous solution containing palladium with solution of substituted heterocyclic ring compound |
| 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 |
| 10/03/1990 | EP0390293A1 A process of treating metal chloride wastes |
| 10/02/1990 | US4960584 Apparatus for hydrometallurgy |
| 10/02/1990 | US4960500 Waste metal extraction apparatus |
| 10/02/1990 | US4960461 Method and installation for extracting gold from gold ore |
| 09/26/1990 | EP0364463A4 Separation and recovery of nickel and cobalt in ammoniacal systems |
| 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 |
| 09/19/1990 | EP0388250A1 Method of treating rare-earth minerals |
| 09/18/1990 | US4957714 Recovering copper from hydroxy oxime extractant |
| 09/18/1990 | US4957658 Process and composition for providing reduced discoloration caused by the presence of pyrithione and ferric ion in water-based paints and paint bases |
| 09/14/1990 | WO1990010602A1 Bioslurry reactor for treatment of slurries containing minerals, soils and sludges |
| 09/14/1990 | CA2050296A1 Bioslurry reactor for treatment of slurries containing minerals, soils and sludges |
| 09/11/1990 | US4956154 Selective removal of chromium, nickel, cobalt, copper and lead cations from aqueous effluent solutions |
| 09/07/1990 | WO1990010046A1 Process and composition for providing reduced discoloration caused by the presence of pyrithione and ferric ion in water-based paints and paint bases |
| 09/05/1990 | EP0385968A2 Process for separating and recovering dissolved and precipitable metals, in particular heavy metals, from aqueous solutions |
| 09/04/1990 | US4954466 Solvent extraction with trialkylamine containing hydrocarbon from n-acetyliminodiacetic acid |
| 09/04/1990 | US4954322 Process for the recovery of metal values contained in a gangue |
| 09/04/1990 | US4954168 Reclaiming of aluminum-chromium waste materials from etching operations |
| 09/03/1990 | CA2011347A1 Rare earth mimeral processing method |
| 08/28/1990 | US4952387 Evaporative concentration, cooling, separation while controlling ferric concentration |
| 08/28/1990 | CA1273209A1 Utilization of oxygen in leaching and/or recovery procedures employing carbon |
| 08/08/1990 | EP0381579A1 Method of extracting uranium (VI) and/or plutonium (IV) present in an aqueous acid solution by means of a mixture of N,N-dialkyl amides, for use in the reprocessing of irradiated nuclear fuels |
| 08/08/1990 | CN1044499A Extraction of rare-earth elements by circulating oxalic acid |
| 08/08/1990 | CN1044409A Solvent extraction |
| 07/31/1990 | US4945049 Method for preparing magnetic powder |
| 07/25/1990 | CN1044128A Purifying copper electrolyte by means of liquid-liquid extraction |
| 07/24/1990 | US4943646 Gallium complexes and solvent extraction of gallium |
| 07/18/1990 | WO1990008108A1 Method and device for separating mercury from an aqueous medium |
| 07/18/1990 | EP0276215B1 Process for extracting precious metals from ore concentrates |
| 07/18/1990 | CA2020467A1 Process for the removal of mercury from an aqueous medium and an apparatus therefor |
| 07/18/1990 | CA2007877A1 Process and plant for the processing of slag from aluminium scrap and waste melting, recovery of components thereof and treatment of gasses generated |
| 07/17/1990 | US4942024 Method for refining hydroxides of niobium and tantalum containing transition metals |
| 07/17/1990 | US4942023 Complexing metals with 8-hydroxyquinolines |
| 07/17/1990 | US4941917 Recovering gold by oxidation of organic carbon |
| 07/12/1990 | WO1990007468A1 Recovery of heavy and precious metals from aqueous solutions |
| 07/11/1990 | CN1043752A Process for extracting scandium from ore |
| 07/11/1990 | CN1043685A Process for extracting rare-earth from ion-type sulfuric acid immersion of rare-earth ore by liquid ammonia deposition |