| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 06/16/1981 | CA1103039A1 Leaching of nickeliferous oxide ores containing iron and/or aluminum |
| 06/16/1981 | CA1103035A1 Removal of actinide metals from solution |
| 06/11/1981 | WO1981001577A1 Reduction of organic solvent losses in hydrometallurgy |
| 06/10/1981 | EP0030106A1 A method for the selective removal of ferric ions from an aqueous solution, selective metal-chelating resins for use therein, and a method for their preparation |
| 06/10/1981 | EP0030067A1 Process for the extraction of metal ions |
| 06/09/1981 | US4272492 Selective extraction and recovery of copper |
| 06/09/1981 | CA1102557A1 Desorption of gold from activated carbon |
| 06/02/1981 | CA1102142A1 Recovery of useful materials from calcines |
| 05/26/1981 | US4269809 Recovery in titanium metal values by solvent extraction |
| 05/26/1981 | US4269808 Method of simultaneously subjecting ores to pulverization and leaching or extraction |
| 05/26/1981 | US4269699 Bioadsorption alteration of iron sulfide surfaces |
| 05/26/1981 | US4269676 Leaching using a solvent mixture of pyridine, a-, b-, or g-picoline or 2,6-lutidine and a chlorinated methane to form a soluble metal complex |
| 05/26/1981 | US4269621 Recovering, gold, platinum, palladium, rhodium, ruthenium, osmium, and iridium from waste solutions |
| 05/26/1981 | CA1101678A1 Separation and purification of ruthenium |
| 05/20/1981 | EP0028648A1 Method for recovering molybdenum from tungsten solutions. |
| 05/12/1981 | US4266972 In which a sulfide ore is leached and oxidized to precipitate the insoluble sulfates of lead and precious metals, which are then leached by sodium and calcium chloride, and removed |
| 05/12/1981 | CA1100763A1 Hydrometallurgical leaching and refining of nickel- copper concentrates |
| 05/06/1981 | EP0028158A1 Methods and systems of removal of metals from solution and of purification of metals and purified solutions and metals so obtained |
| 05/05/1981 | US4265862 From radioactive impurities |
| 04/30/1981 | WO1981001159A1 Process and apparatus for producing metals at porous hydrophobic catalytic barriers |
| 04/30/1981 | WO1981001155A1 Metal recovery method |
| 04/29/1981 | EP0027769A1 Metal recovery method |
| 04/28/1981 | CA1100094A1 Recovery of dissolved species from aqueous solutions by a liquid membrane technique |
| 04/21/1981 | US4263403 Method of extracting uranium from sea water |
| 04/21/1981 | CA1099522A1 Method of recovering gallium from very basic solutions by liquid/liquid extraction |
| 04/14/1981 | US4261961 Process for the extraction of potassium from aqueous alkaline solution |
| 04/14/1981 | US4261959 Process for extracting ferric iron from an aqueous solution |
| 04/14/1981 | US4261737 Leaching ore with ammoniacal ammonium salt solution, adsorption oncarbon which has been pretreated with acid |
| 04/08/1981 | EP0026700A1 Process for removing heavy metallic elements in suspension in a liquid |
| 04/08/1981 | EP0026502A1 Process for treating an organic phase containing ferric chloride, molybdenum chloride and hydrochloric acid |
| 04/07/1981 | US4260494 Removal of mercury sulfides by oxidation |
| 04/07/1981 | US4260139 Refining of metals |
| 04/07/1981 | CA1098861A1 Method of obtaining copper from copper-bearing ores |
| 04/07/1981 | CA1098719A1 Solvent extraction of non-ferrous metals from iron- containing solutions |
| 04/07/1981 | CA1098718A1 Process for the extraction of metal values from manganese nodules simultaneously |
| 04/01/1981 | EP0026132A1 Process for global recovery of uranium, rare earth metals, thorium and yttrium from an acid solution |
| 03/31/1981 | CA1098322A1 Solvent extraction |
| 03/25/1981 | EP0025466A1 A process for the recovery of arsenic as zinc arsenate from cement copper cake and a process for the purification of an impure zinc electrolyte using zinc arsenate so obtained |
| 03/24/1981 | US4258016 Process for recovering Ni (II), Cu (II) and Co (II) from an ammoniacal-ammonium sulfate leach liquor |
| 03/24/1981 | US4257881 By selective enchancing of magnetic susceptibility to permit physical separation from gangue |
| 03/24/1981 | US4257807 Precious metals recovery process |
| 03/24/1981 | CA1098029A1 Process for recovery of mineral values from underground formations |
| 03/24/1981 | CA1097928A1 Improved floculation process for the separation of hard to filter liquid/solid mixes through filtration |
| 03/24/1981 | CA1097925A1 Method for the recovery of actinide elements from nuclear reactor waste |
| 03/24/1981 | CA1097924A1 Method for recovering palladium and technetium values from nuclear fuel reprocessing waste solutions |
| 03/17/1981 | US4256485 With yeast or malt to form hydrogen sulfide and sulfates |
| 03/17/1981 | CA1097508A1 Recovery of metal values |
| 03/17/1981 | CA1097507A1 Process of treating residues from the leaching of roasted zinc blende |
| 03/10/1981 | US4255396 Extracting with di-2-ethylhexyl phosphoric acid with dinonylnaphthalene sulfonic acid as a modifier |
| 03/10/1981 | US4255395 Solvent-extraction process for recovery and separation of metal values |
| 03/10/1981 | US4255394 Process for the separating of rare earths |
| 03/10/1981 | CA1097212A1 Solution mining method utilizing dissolved oxygen |
| 03/10/1981 | CA1097211A1 Process for recovering uranium and other base metals |
| 03/03/1981 | US4254087 Extraction of copper, nickel and cobalt using alkylaromatic sulfonic acids and chelating amines |
| 03/03/1981 | CA1096636A1 Hydrometallurgical process for the selective dissolution of mixtures of oxy compounds |
| 02/24/1981 | US4252775 Recovering a lead-bearing by-product by leaching with sulfuric acid in countercurrent stages |
| 02/24/1981 | US4252622 Using dilute sulfuric acid and either coarse or fine zinc to precipitate cement copper and cobalt; multistage |
| 02/24/1981 | US4252621 Process of regenerating an ammoniacal etching solution |
| 02/24/1981 | CA1096358A1 O- hydroxyaryloxime - alkylphenol composition and use thereof for extracting copper |
| 02/18/1981 | EP0024063A1 Process for separating trivalent iron from an aqueous chloride solution |
| 02/17/1981 | US4251352 Inclined separation screen for agitation tank |
| 02/17/1981 | CA1095731A1 Stripping of cobalt from nickel-cobalt loaded organic |
| 02/10/1981 | CA1095262A1 Method for the removal of ferric ions from a concentrated aqueous zinc solution |
| 02/10/1981 | CA1095258A1 Recovery and purification of rhodium |
| 02/04/1981 | EP0023428A1 Liquid-liquid process for extracting metals using organo-phosphorous compounds |
| 02/03/1981 | US4248837 Solvent extraction of copper, nickel with methyl hexyl dioxime |
| 02/03/1981 | US4248703 Attachment to floating continuous string belt |
| 02/03/1981 | CA1094819A1 Hydrometallurgical process for the recovery of zinc, copper, and cadmium from their ferrites |
| 02/03/1981 | CA1094818A1 Process for the separation of recuperable values in titanium residues in sulphate form |
| 02/03/1981 | CA1094817A1 Hydrometallurgical recovery of metal values |
| 01/28/1981 | EP0023173A1 Diphosphonic and triphosphonic acid esters, their preparation and applications |
| 01/28/1981 | EP0022839A1 Recuperation of cyanides from rinsing solutions of cyanidric processes for electrodeposition of metals |
| 01/27/1981 | CA1094671A1 Visual image display device |
| 01/27/1981 | CA1094326A1 Process for the precipitation of iron as jarosite |
| 01/27/1981 | CA1094296A1 Effecting liquid-liquid contact |
| 01/20/1981 | US4246240 Process for separating cobalt and nickel from a solution containing cobalt and nickel |
| 01/20/1981 | CA1094012A1 Atmospheric leach ion-exchange process for treating iron-containing nickel-copper matte |
| 01/20/1981 | CA1093840A1 Process for the recovery of the metal values of complex pyrites |
| 01/20/1981 | CA1093839A1 Hydrometallurgical recovery of metal values |
| 01/20/1981 | CA1093831A1 Uranium extraction |
| 01/20/1981 | CA1093830A1 Recovery of manganese values |
| 01/20/1981 | CA1093828A1 Treatment of tri(alkaline earth metal tungstates with organic amines) |
| 01/14/1981 | EP0022186A1 Apparatus for liquid-liquid extraction |
| 01/13/1981 | US4244735 Chloride leach process for recovering metal values in the presence of arsenic |
| 01/13/1981 | US4244734 Hydrometallurgy or pyrometallurgy |
| 01/13/1981 | CA1093537A1 Oximes and process for the separation of copper values from aqueous solutions |
| 01/07/1981 | EP0021990A1 Process for treating mixtures of rare earth oxides and gallium oxides |
| 01/07/1981 | EP0021809A1 Chloride leaching |
| 01/07/1981 | EP0020826A1 A hydrometallurgical process for recovering precious metals from anode slime |
| 01/07/1981 | EP0020483A1 Improvements relating to extractants. |
| 01/06/1981 | US4243638 Iron EDTA chelate catalyzed oxidation of uranium |
| 12/30/1980 | US4242448 Carbonates |
| 12/30/1980 | US4242314 Solvent extraction, monoalkyl ester of alkylphosphonic acid |
| 12/30/1980 | US4242312 Removal of sodium sulfate from a sulfate-containing sodium chloride solution in a process for separating zirconium and hafnium |
| 12/30/1980 | US4242129 Method of recovering metals |
| 12/30/1980 | US4242127 Process for treating hydroxide sludge residues containing nonferrous metals |
| 12/30/1980 | CA1092477A1 Fluidizing means for reducing viscosity of slurries |
| 12/30/1980 | CA1092365A1 Refining of ferrous and base metal sulphide ores and concentrates |
| 12/30/1980 | CA1092360A1 Process for recovery of selected metal values from waste waters |
| 12/23/1980 | US4241039 Oxidation, precipitation of ferric hydroxide |