| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 12/08/1981 | US4304644 Autoclave oxidation leaching of sulfide materials containing copper, nickel and/or cobalt |
| 12/08/1981 | US4304599 Heavy metal removal process |
| 12/02/1981 | EP0040659A1 Heavy metal recovery in ferrous metal production processes |
| 12/01/1981 | US4303620 Extraction process |
| 12/01/1981 | US4303441 Metal recovery process |
| 12/01/1981 | CA1113494A1 Sulfonamido oximes, metal complexes thereof, and solutions containing such compounds for use in extraction of metal values |
| 12/01/1981 | CA1113253A1 Process for the treatment of raw materials containing arsenic and metal |
| 11/25/1981 | EP0040243A1 Process and apparatus for producing metals at porous hydrophobic catalytic barriers. |
| 11/24/1981 | CA1112881A1 Method and extraction reagent for extraction of metal ions from an agueous solution |
| 11/24/1981 | CA1112880A1 Hydrometallurgical process for the treatment of oxides and ferrites which contain iron and other metals |
| 11/18/1981 | EP0039837A1 Process for the oxidation of ferrous ions to the ferric state in sulfate leach solutions |
| 11/17/1981 | US4301125 Comprising peroxymonosulfuric acid |
| 11/17/1981 | US4301124 Cobalt solvent extraction with dioxime ion exchangers |
| 11/17/1981 | US4301121 Method for leaching metal bearing ores |
| 11/17/1981 | CA1112602A1 Process and apparatus for mixing and separation in a solvent extraction |
| 11/17/1981 | CA1112460A1 Solvent extraction process |
| 11/10/1981 | CA1112053A1 Leaching of ores and the separation of mixed sulphide precipitates |
| 11/03/1981 | US4298499 Recovery of catalysts |
| 11/03/1981 | US4298380 Treating with aqueous solution of inorganic acid or alkali in presence of organic compounds with ionogenic groupings |
| 11/03/1981 | CA1111825A1 Regeneration of organic extractants containing alpha hydroxyoximes |
| 10/28/1981 | EP0038764A1 Uses of diphosphonic derivatives in cation exchange, diphosphonic derivatives and their manufacturing processes |
| 10/27/1981 | US4297218 Process and apparatus for extracting a substance from a body of water |
| 10/27/1981 | US4297134 Method of recovering gold |
| 10/21/1981 | EP0038322A1 Process for recovering metals from metallic salt solutions |
| 10/20/1981 | US4296073 High temperature attack of ores by means of a liquor essentially containing a soluble bicarbonate |
| 10/20/1981 | CA1111156A1 Process for the treatment of alkaline liquors containing sulfate ions |
| 10/20/1981 | CA1110992A1 Process for removing metal contaminants from used lubricating oils |
| 10/14/1981 | EP0037655A2 A phenolic chelate resin, a process for producing the same, and a method of recovering a heavy metal ion with the same |
| 10/13/1981 | US4294965 Recovering metals from solutions |
| 10/06/1981 | US4293530 Removal of iron as sulfate |
| 10/06/1981 | US4293527 Metals extraction from sea water |
| 10/06/1981 | US4293334 Recovery of metals |
| 10/06/1981 | US4293333 Microbiological recovery of metals |
| 10/06/1981 | US4293332 Hydrometallurgical process for recovering precious metals from anode slime |
| 10/06/1981 | CA1110077A1 Copper leaching process employing nitrogen dioxide |
| 10/06/1981 | CA1110076A1 Metal leaching from concentrates using nitrogen dioxide in acids |
| 09/29/1981 | US4292408 Mass and a method of preparing same of living cells of organisms for adsorbing metal ions from a physiological solution, and employment of the mass for enriching metals |
| 09/29/1981 | US4292284 Solvent extraction recovery process for indium |
| 09/29/1981 | US4292280 Hydrometallurgy |
| 09/29/1981 | US4292196 Group viii metal carbonyl or organometallic complex hydroformylation catalyst, amine or ammonia treatment |
| 09/29/1981 | CA1109826A1 Electrolytic metal recovery with sulphate ion diffusion through ion-permeable membrane |
| 09/23/1981 | EP0036401A1 A reagent and a method for the extraction of copper from an ammoniacal copper solution |
| 09/22/1981 | CA1109274A1 Rhodium recovery from hydroformylation still heel with triaryl phosphite ligand |
| 09/22/1981 | CA1109273A1 Separation and selective recovery of metal ions |
| 09/21/1981 | EP0028648A4 Method for recovering molybdenum from tungsten solutions. |
| 09/17/1981 | WO1981002569A1 A method of purifying waste aqueous solutions from heavy metals |
| 09/15/1981 | US4289531 From industrial waste water by treatment with feathers, hair, hoof meal or horn meal |
| 09/15/1981 | US4289530 Recovering silver from waste photographic solutions |
| 09/15/1981 | US4289529 Treatment with heat prior to reaction with metal compound to enhance magnetic susceptibility |
| 09/15/1981 | US4289528 Process for beneficiating sulfide ores |
| 09/15/1981 | CA1108867A1 Hydrometallurgical process for the treatment of sulphidized compounds containing lead |
| 09/08/1981 | US4288413 Sulfiding |
| 09/08/1981 | US4288412 Post treatment method for the recovery of uranium from wet-process phosphoric acid |
| 09/08/1981 | US4288304 Hydrometallurgical process for treatment of sulphur ores |
| 09/08/1981 | CA1108376A1 Method of removal of arsenic from a sulfuric acid solution |
| 09/01/1981 | US4287159 Also containing boron, using an ion exchange resin, o-mercaptobenzoic acid, and a quaternary ammonium salt |
| 09/01/1981 | CA1108090A1 Recovery of variable valency metals from compounds in voltaic cell |
| 09/01/1981 | CA1107975A1 Process for selective extraction of metal ions from aqueous solutions and extracting agents suitable for that purpose |
| 09/01/1981 | CA1107974A1 Process for the simultaneous extraction of all metal values other than copper from manganese nodules |
| 08/25/1981 | US4285691 Alkoxylated fatty amines and polyamines as reserving agents |
| 08/18/1981 | US4284512 Iron selective resins prepared from a phenol, HCHO and a di-secondary amine |
| 08/18/1981 | CA1107082A1 Process for the recovery of metal from a solution by precipitation |
| 08/18/1981 | CA1107079A1 Process for removing zinc from a nickel solution by extraction |
| 08/11/1981 | US4283290 For recovery of dissolved species in aqueous solutions |
| 08/11/1981 | US4283224 Containing precious metals, tin dioxide, lead sulfate by complexing, carbonating, leaching the solid residue, ion exchanging |
| 08/11/1981 | CA1106622A1 Hydrometallurgical method for treating sulphide ores |
| 08/11/1981 | CA1106618A1 Dissolution of cobaltic hydroxide with organic reductant |
| 08/11/1981 | CA1106617A1 Autoclave oxidation leaching of sulfide materials containing copper, nickel and/or cobalt |
| 08/11/1981 | CA1106615A1 Process for recovering actinide values |
| 08/11/1981 | CA1106614A1 Process for the separation of gallium |
| 08/04/1981 | US4282189 Precipitation of metal values from organic media |
| 08/04/1981 | US4282112 Ruthenium recovery process by solvent extraction |
| 08/04/1981 | CA1106188A1 Extraction process |
| 07/28/1981 | CA1105927A1 Triple ions of 1,2-and 1,4-dicarbonyl compounds and analogs thereof containing nitrogen and containing two strategic oxygen or nitrogen groups and process for producing same |
| 07/28/1981 | CA1105713A1 Method for leaching and precipitating metal from a solid containing metal |
| 07/21/1981 | US4279870 Liquid-liquid extraction process for the recovery of tungsten from low level sources |
| 07/21/1981 | US4279868 Voids, collapsing |
| 07/21/1981 | CA1105410A1 Method of obtaining copper from sulphurized concentrates |
| 07/21/1981 | CA1105267A1 Process for the extraction of metal values from manganese nodules |
| 07/14/1981 | US4278642 Sulfidizing |
| 07/14/1981 | US4278641 Distillation, ion exchanging |
| 07/14/1981 | US4278640 Bubbling air, flotation |
| 07/14/1981 | US4278539 Method for removing heavy metals from aqueous liquids |
| 07/14/1981 | CA1104838A1 Leaching of metal sulphides |
| 07/14/1981 | CA1104837A1 Process for recovery of copper and zinc from complex sulfides |
| 07/14/1981 | CA1104796A1 Vibratory cementator for extraction of metals from their water solutions |
| 07/08/1981 | EP0031408A2 Method for separating metal from soot |
| 07/07/1981 | US4277345 Method for the recovery of uranium dissolved in sea water |
| 07/07/1981 | CA1104350A1 Separation of cobalt and nickel by solvent extraction |
| 06/30/1981 | US4276269 Precipitation of ferric silicate from zinc sulfate solution |
| 06/30/1981 | US4276235 Method for purifying bidentate organophosphorous compounds |
| 06/30/1981 | US4276081 Process for beneficiating ores |
| 06/30/1981 | CA1103939A1 Hydrometallurgical process for the treatment of soluble silicate-bearing materials |
| 06/30/1981 | CA1103936A1 Process for purifying nickel sulfate solution |
| 06/23/1981 | US4275039 Separation of tungsten and molybdenum by solvent extraction |
| 06/23/1981 | US4275037 Uranium |
| 06/23/1981 | CA1103464A1 Separation and recovery of copper metal from ammoniacal solutions |
| 06/16/1981 | US4273631 Process for the continuous recovery of gold and other metals from sea water |
| 06/16/1981 | CA1103041A1 Method for dissolving the non-ferrous metals contained in oxygenated compounds |
| 06/16/1981 | CA1103040A1 Leaching of nickeliferous oxide ores |