| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 07/11/1990 | CN1008693B Catalyst recovery process |
| 07/04/1990 | CN1043529A Separating gold and silver from gold mud by ammonia method |
| 07/04/1990 | CA2007071A1 Recovery of heavy and precious metals from aqueous solutions |
| 07/03/1990 | US4939299 Succinyl dihydroxamic acids |
| 07/03/1990 | US4938895 Process for removing radioactive ruthenium from aqueous solution |
| 07/03/1990 | US4938871 Method for the recovery of actinides and/or lanthanides using novel extraction agents, and novel propane diamides, and the preparation thereof |
| 06/30/1990 | CA2006893A1 Process for extracting noble metals |
| 06/27/1990 | EP0252912B1 Immobilised extractants |
| 06/27/1990 | CN1043346A Method for reclaiming w and co from waste materials and products thereof |
| 06/26/1990 | US4936910 From a leachate containing gold bromide complex, contacting leacheate with peat moss for concentration |
| 06/26/1990 | US4936909 Process for producing fine particulate metals |
| 06/20/1990 | EP0373420A1 Process for the separation of copper from aqueous basic solutions |
| 06/20/1990 | CN1043161A Gold reclaiming and extraction with activated carbon fibre |
| 06/20/1990 | CN1008448B Method of seperating and purifying iridium by reduction with hydrogen under pressure |
| 06/20/1990 | CN1008447B Method of recovering noble metals from concentrated mineral |
| 06/20/1990 | CN1008446B Leaching process |
| 06/19/1990 | CA1270373A1 Process for the fluid-fluid extraction of gallium, germanium, or indium from liquid solutions |
| 06/13/1990 | CN1042947A Technological process of recovering of gold from lower grade goldmine |
| 06/12/1990 | US4933078 Sorption vessel with internal interstage screening vessel |
| 06/10/1990 | CA2004692A1 Process for separating copper from aqueous base solutions |
| 06/06/1990 | EP0371832A1 Recovery of Gallium contained in aqueous solutions |
| 06/05/1990 | US4931262 Method of treating H2 S containing gases |
| 05/30/1990 | EP0370266A1 Use of substituted thio ureas in the separation of complexed heavy metal ions |
| 05/30/1990 | EP0370233A1 Process for the removal of impurity elements from electrolyte solutions containing valuable metals |
| 05/30/1990 | CN1042570A High-purity terbium oxide preparation by use of fractional extraction method |
| 05/30/1990 | CN1042526A Prepn. of high purity yttrium oxide and lanthanum oxide |
| 05/23/1990 | CN1008118B Prepn. of znso4 and active zno from zinc ore by entire wet-process |
| 05/23/1990 | CN1008117B Process for gold extraction by acid leaching and polyurethane foam concentration and installation thereof |
| 05/22/1990 | US4927610 Synergistic mixture of tetrathiamacrolycles and sulfonic acids |
| 05/22/1990 | US4927609 Recovery of gallium/rare earth values from oxide mixtures thereof |
| 05/22/1990 | CA1269252A1 Using oxygen for leaching |
| 05/17/1990 | WO1990005115A1 Phosphonic acids and their uses in separation |
| 05/16/1990 | EP0367957A2 Process for recovering rhodium |
| 05/15/1990 | US4925485 Process for the isolation of noble metals |
| 05/15/1990 | US4925247 Method for particle stabilization by use of cationic polymers |
| 05/09/1990 | EP0366834A2 Method for producing powdered iron oxide |
| 05/09/1990 | CN1007908B Continuous horizontal vacuum band-type filter machine and percolation filtration-dipping process |
| 05/08/1990 | US4923686 Process for the extraction of metal values |
| 05/08/1990 | US4923630 Extractant composition |
| 05/08/1990 | US4923615 Multistage vertical perforated plates; forward and countercurrent flow |
| 05/08/1990 | US4923531 Deoxidation of titanium and similar metals using a deoxidant in a molten metal carrier |
| 05/08/1990 | US4923507 Process for opening ores |
| 05/03/1990 | WO1990004654A1 Method for separating interfering elements from valuable metal electrolyte solutions |
| 05/02/1990 | EP0366334A1 Improvements in or relating to the recovery of silver |
| 05/02/1990 | CN1041787A Treatment of antimony sulfide ore of high lead and arsenic content |
| 05/01/1990 | US4922012 Compositions of matter comprising dialkyl-(N,N-dialkylcarbamoylmethyl) phosphine oxides |
| 04/30/1990 | CA2001432A1 Process for recovering gold from refractory sulfidic ores |
| 04/28/1990 | CA2001564A1 Process for selective extraction of contaminant elements from mixtures of electrolytes in solution |
| 04/25/1990 | EP0364904A2 Purified solution containing iron and manganese, and method producing thereof |
| 04/25/1990 | EP0364463A1 Separation and recovery of nickel and cobalt in ammoniacal systems. |
| 04/24/1990 | US4919716 Method for dissolution of metal |
| 04/20/1990 | CA2001064A1 Process for treatment of ores |
| 04/18/1990 | EP0363552A1 Process for preparing metal particles |
| 04/18/1990 | EP0363455A1 Method for removal of heavy metals, especially cadmium, from phosphoric acid containing solutions |
| 04/18/1990 | CN1041396A Process for preparing metallic and non-metallic elements by magnesium chloride |
| 04/18/1990 | CN1007624B Recovery of gold from auriferous refractory iron-containing sulphidic ore |
| 04/17/1990 | US4918018 Microorganism for use in industrial processes |
| 04/12/1990 | CA2000463A1 Metal recovery process |
| 04/11/1990 | EP0362428A1 Process and apparatus for the treatment of a sulfuric-acid solution containing ferrous sulfate |
| 04/11/1990 | CN1041183A Process for separation of rare-earth elements |
| 04/10/1990 | US4915919 Recovery of germanium from aqueous solutions by solvent extraction |
| 04/10/1990 | US4915836 Solids dispersion transfer pump with intermediate chamber |
| 04/06/1990 | CA2000312A1 Process and device for the reworking of a dilute sulphuric acid solution which contains dissolved ferrous sulphate or a mixture of dissolved metal sulphates which are mainly ferrous sulphate |
| 04/04/1990 | EP0362116A2 Dioxime kinetic enhancer for solvent extraction of gallium from basic aqueous solutions thereof |
| 04/04/1990 | CN1007423B Direct wet antimony white productive process from antimony ore |
| 04/03/1990 | US4913884 Uranium-preextraction in zirconium/hafnium separations process |
| 04/03/1990 | US4913730 Recovery of gold from aqueous solutions |
| 04/03/1990 | CA1267289A1 Process for the separation of metals from aqueous media |
| 03/28/1990 | CN1040826A Transition metal recovery |
| 03/27/1990 | US4911835 Seawater-dissolved metal collecting system |
| 03/27/1990 | US4911804 Electrochemical reactor for copper removal from barren solutions |
| 03/22/1990 | WO1990002823A1 IMPROVED PROCESS FOR OBTAINING IMPURITY-FREE COMPOUNDS OF Ta AND/OR Nb FROM MATERIALS CONTAINING THESE METALS |
| 03/20/1990 | US4910000 Method of extracting tungsten values from tungsten containing ores |
| 03/14/1990 | CN1007162B Catalytic-roast wet silver recovery |
| 03/13/1990 | US4908462 Cobalt recovery method |
| 03/13/1990 | US4908317 Metal accumulation and polysaccharide production |
| 03/13/1990 | US4908108 Electrolytic oxidation of cerium 3+ values to cerium 4+ values |
| 03/07/1990 | EP0356803A2 Process for the preparation of an electrolyte for obtaining alkali metal bichromates and chromic acid |
| 03/07/1990 | EP0356605A1 Metal precipitation and neutralisation apparatus for metal pickles containing several metals |
| 02/28/1990 | EP0356136A2 A method for neutralizing sulfuric acid containing zinc ion |
| 02/28/1990 | EP0356132A1 A method for manufacturing titanium oxide |
| 02/28/1990 | EP0355837A2 Transition metal recovery |
| 02/28/1990 | EP0355159A1 Mixing-settling apparatus for liquid-liquid extraction |
| 02/28/1990 | CN1039974A Preparation of chinese "maifan" stone extraction |
| 02/27/1990 | US4904358 Using electrolyzed sodium bromide solution to oxidize and solubilize base metal sulfides and to complex gold/silver/sodium bromide; precipitation |
| 02/22/1990 | WO1990001572A1 Waste metal extraction apparatus |
| 02/21/1990 | EP0355045A2 Composition comprising a macrocyclic compound and an organic acid and its use in metal extraction |
| 02/21/1990 | CN1039848A Method of chlorine gas selecting infusion nickel |
| 02/20/1990 | US4902344 Ferric chloride leach of a metal-sulphide bearing material |
| 02/20/1990 | US4902343 Hydrometallurgical process for the treatment of sulphidized compounds containing lead |
| 02/13/1990 | US4900522 Separation of nickel and cobalt from sulfate solutions by solvent extraction |
| 02/06/1990 | US4898827 Metal recovery |
| 02/06/1990 | CA1265503A1 Composition and use of the composition for the extraction of metals from aqueous solutions |
| 02/01/1990 | DE3825319A1 Process and apparatus for the separation and selective degradation of ionic and nonionic constituents from aqueous and nonaqueous solutions |
| 01/31/1990 | CN1006634B Process for manufacturing zinc sulfate from sicica-rich zine oxide |
| 01/24/1990 | CN1006555B Recovery of gold from refractory auriferous iron-containing sulphidic concentrate |
| 01/23/1990 | US4895905 Gel-type chelating resins and a process for removal of multi-valent, alkaline earth or heavy metal cations from solutions |
| 01/18/1990 | DE3823573A1 Process for the utilisation of materials containing iron oxides and compounds of non-ferrous heavy metals |
| 01/17/1990 | EP0350858A1 Process for separating nickel from diluted aqueous solutions containing nickel ions |
| 01/16/1990 | US4894407 Phosphorous compounds |