| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 06/15/1994 | EP0601276A1 Process for the transformation of copper from wastewater containing copper in the spent copper chloride etching solution from printed circuit board fabrication |
| 06/15/1994 | EP0601027A1 Titanium extraction |
| 06/15/1994 | CN1087955A Low temp. one-step purification of zinc baking sand immersion |
| 06/14/1994 | US5320759 Pollution control |
| 06/14/1994 | US5320665 Leaching with thiourea, cementation with sulfur dioxide present prior to contact with steel |
| 06/14/1994 | US5320663 Method of obtaining lead and organolead from contaminated media using metal accumulating plants |
| 06/09/1994 | WO1994012502A1 Bis-crown calix[4]arenes, method for preparing same and use thereof for selectively recovering cesium and actinides |
| 06/08/1994 | EP0600066A1 Method for detoxication of combustion residues by removing the movable toxic compounds and by binding and concentrating said compounds obtained from treatment solutions |
| 06/08/1994 | EP0599911A1 Copper recovery process |
| 06/08/1994 | CN1024926C Method for recovery of Ge from solution |
| 06/07/1994 | CA1329989C Method and apparatus for biological processing of metal-containing ores |
| 06/01/1994 | EP0599003A1 Apparatus and process for regeneration of an ion-exchange installation |
| 06/01/1994 | EP0598747A1 N-ethyl hydroxamic acid chelants. |
| 06/01/1994 | DE4306426A1 Regeneration of resin in ion-exchange plant |
| 06/01/1994 | CN1087388A Extracting technological method for purifying separating rare earth element |
| 05/31/1994 | US5316751 Methods for mine tailing clean-up using recovery technologies |
| 05/31/1994 | US5316683 Metal extraction by ion exchange |
| 05/31/1994 | US5316567 Agitation leaching, solvent extraction |
| 05/31/1994 | CA1329957C Process for removing metal contaminants from liquids and slurries |
| 05/25/1994 | CN1024687C Process for recovering Au and Pd from waste catalyst and liquid delivering valve |
| 05/25/1994 | CN1024686C Process for recovering platinum from waste catalyst |
| 05/25/1994 | CN1024685C Process for recovering Pd from waste Pd-C catalyst and burner system |
| 05/24/1994 | CA1329697C Method for manufacturing titanium oxide |
| 05/18/1994 | CN1024565C Method for preparing light-magnesium oxide from serpentine tailings |
| 05/11/1994 | WO1994010350A1 Production of metallic cobalt powder |
| 05/11/1994 | CN1086548A Preparation of highly pure manganese sulfate with high yield rate |
| 05/10/1994 | US5310486 Multi-stage water treatment system and method for operating the same |
| 05/04/1994 | EP0594599A1 Process for producing chelatising ion-exchange resins and their use in metal extraction |
| 05/04/1994 | EP0463062B1 Bioslurry reactor for treatment of slurries containing minerals, soils and sludges |
| 05/04/1994 | CN1086268A Separation and enrichment method for rhodium, iridium and aurum, platinum, palladium in solution |
| 05/04/1994 | CN1086267A Method for preparing high-purity yttrium oxide |
| 05/03/1994 | US5308595 Process for the extraction of gallium |
| 05/03/1994 | US5308381 Adding oxidant and heat treatment, forming gold ammine or silver ammine solutions |
| 05/03/1994 | US5308380 MIC oxygenation: "extraction of metals values from metals bearing ores" |
| 04/27/1994 | EP0460203B1 Method for recovering metals from waste liquors |
| 04/27/1994 | CN1085959A Wet process for extraction of cupric oxide for copper oxide ore |
| 04/26/1994 | CA1328842C Process for recovery of metals from metal / plastic waste and the like |
| 04/19/1994 | US5304359 Dissolution of platinum group metals from materials containing said metals |
| 04/19/1994 | US5304233 Recovery of platinum group metals (PGM) from acidic solutions by reduction precipitation with sodium borohydride |
| 04/19/1994 | EP0660881A4 Recovery of nickel. |
| 04/14/1994 | WO1994008058A1 Method for hydrometallurgical processing of zincky byproducts |
| 04/14/1994 | WO1994008057A1 Method for the enhanced recovery of zinc oxide |
| 04/13/1994 | CN1024203C Purifying copper electrolyte by means of liquid-liquid extraction |
| 04/12/1994 | CA1328422C Process for the electrochemical oxydation in an emulsion of cerium 3+ into cerium 4+ |
| 04/10/1994 | CA2107963A1 Tailings retreatment |
| 04/06/1994 | EP0590043A1 Method for processing complex metal sulphide materials |
| 04/06/1994 | CN1084896A Resin substitution extration chromatography for preparing high purity nickel salt |
| 04/06/1994 | CN1084895A Ammonia dipping precipitation technology for treating low grade copper slag or copper oxide ore |
| 04/02/1994 | CA2079638A1 Solvent extraction method |
| 03/31/1994 | WO1994006944A1 A method for recovering gold and other precious metals from carbonaceous ores |
| 03/31/1994 | CA2123810A1 A method for recovering gold and other precious metals from carbonaceous ores |
| 03/30/1994 | EP0468978B1 Process for recovering germanium |
| 03/30/1994 | CN1084585A Process for one-stage electrolytic extraction of copper |
| 03/30/1994 | CN1084575A Process for preparation of pure ammonium turgstate by ion-exchange one-stage separation of phosphorus, arsenic, silicon and molybdenum |
| 03/30/1994 | CN1084574A Extractant for separating rare-earth metal |
| 03/29/1994 | US5298618 Reaction product of oxalic acid, oxalic ester with a diamine |
| 03/23/1994 | CN1084223A Upgrading titaniferous materials |
| 03/22/1994 | US5296146 Reducing concentration of TNT-related explosives |
| 03/16/1994 | EP0410996B1 A process of recovering non-ferrous metal values, especially nickel, cobalt, copper and zinc, by using melt and melt coating sulphation, from raw materials containing said metals |
| 03/16/1994 | CN1083868A A hydrometallurgical method of producing metallic lead from materials containing oxides, particularly from the active material of accumulators |
| 03/15/1994 | US5294415 Hydroformylation |
| 03/12/1994 | CA2078091A1 Hydrometallurgical method of producing metallic lead from materials containing oxides, particularly from the active material of accumulators |
| 03/09/1994 | CN1083537A Iron-removing process by solvent extraction |
| 03/09/1994 | CN1083536A Method for extracting gallium from vanadic slag containing gallium |
| 03/09/1994 | CN1083535A Frame loading total-immersion dynamic countercurrent leaching process |
| 03/08/1994 | US5292491 Using pyridinecarboxylic ester extraction medium |
| 03/08/1994 | US5292490 Recovery platinum group metals from oxides ores |
| 03/08/1994 | CA1327452C Separation of nickel from copper in autoclave |
| 03/05/1994 | CA2077601A1 Recovery of indium by solvent extraction using trialkyl-phosphine oxides |
| 03/03/1994 | WO1994004709A1 Upgrading titaniferous materials |
| 03/03/1994 | WO1993016204A3 Process and apparatus for extracting solutes from their aqueous solutions |
| 03/02/1994 | CN1083119A Process for leaching Au and Ag by use of mercaptoacetic acid (salt) and thiourea |
| 03/02/1994 | CN1083118A Process for leaching lead from concentrate of lead sulfide ore by using silicofluoric acid |
| 03/02/1994 | CN1083023A Improved acid eduction process for producing alumina |
| 03/01/1994 | US5290697 Gram-positive bacteria; grows in aqueous saline solution; absorbs metal oxides in aqueous solutions |
| 03/01/1994 | US5290526 Processes to recover and reconcentrate gold from its ores |
| 03/01/1994 | US5290525 Demetallization, leaching and separation |
| 03/01/1994 | US5290453 Process for preparing chelating ion exchanger resins and the use thereof for the extraction of metals |
| 02/23/1994 | CN1082617A Method for extracting V2O5 from vanadium slag |
| 02/23/1994 | CN1082616A Technology of electric deposition of copper powder and extracting cupric oxide ore by carbon amino method |
| 02/23/1994 | CN1082615A Technology for separating gold from silver without pollution |
| 02/22/1994 | US5288302 Method and apparatus for extraction of metal values from metal bearing ores |
| 02/22/1994 | CA1327114C Method for precipitating and separating metals |
| 02/17/1994 | WO1994003649A1 Inorganic perbromide compositions and methods of use thereof |
| 02/17/1994 | CA2141312A1 Inorganic perbromide compositions and methods of use thereof |
| 02/16/1994 | CN1082118A Settling process for extracting vanadium from bone coal |
| 02/15/1994 | US5286465 Leaching with hot concentrated sulfuric acid, separating precipitate by filtration, washing with volatile liquid, collecting filtered acid and washings |
| 02/15/1994 | US5286463 Using a reducing sugar |
| 02/15/1994 | US5285972 Mechanical separation of lead and zinc minerals; grinding; conditioning; flotation; agglomeration |
| 02/08/1994 | US5284633 Solvent extraction of precious metals with hydroxyquinoline and stripping with acidified thiourea |
| 02/08/1994 | US5284505 Method for recovering metallic nickel from ferric chloride waste liquid |
| 02/03/1994 | WO1993024669A3 Continuous ore reaction process |
| 02/02/1994 | CN1081530A Process for dissolving plutonium and/or other radioactive elements present in solid or liquid products and microwave heating apparatus for performing this process |
| 02/02/1994 | CN1081471A Method for extracting gold and silver by using thiourea |
| 02/01/1994 | US5283192 Biological process for enhanced manganese and silver recovery from refractory manganiferous silver ore |
| 02/01/1994 | US5282884 Precipitate noble metal as tellurium alloy; separation |
| 02/01/1994 | CA1326588C Process for separating metal sulphates from sulphuric acid |
| 01/27/1994 | DE4239870C1 Conversion ion exchange plant for the recovery of metals from solns. - with compressed air diaphragm pump and pump stroke counter system |
| 01/25/1994 | US5281336 Composition and use of the composition for the extraction of metals from aqueous solution |
| 01/25/1994 | CA1326371C Oxidation process |