| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 08/06/1997 | CN1035558C Cuilin resin substitution extraction chromatography for preparing high purity nickel salt |
| 08/05/1997 | US5654458 Recovery of palladium |
| 07/30/1997 | EP0786021A1 Process for making copper foil |
| 07/30/1997 | CN1155587A Removal of arsenic from rich arsenic content materials |
| 07/30/1997 | CN1155586A Method for reduction extracting manganese oxide with phenol |
| 07/29/1997 | US5651947 Recovery of zinc from sulphidic concentrates |
| 07/29/1997 | US5651807 Method for treatment of residues from organochlorosilane and/or chlorosilansynthesis |
| 07/23/1997 | EP0784709A1 Recovery of zinc from sulphidic concentrates |
| 07/23/1997 | CN1035485C Method for extracting copper from gold concentrate containing high content of copper |
| 07/23/1997 | CN1035484C Method for extracting gallium from vanadic slag containing gallium |
| 07/22/1997 | US5650057 Chloride assisted hydrometallurgical extraction of metal |
| 07/22/1997 | US5650056 Uses a surfactant having hydrophilic, hydrophobic and chelation groups |
| 07/17/1997 | WO1997025447A1 Method for recovering heavy metals from acid and ammonia solutions |
| 07/16/1997 | EP0783593A1 Method for recovering metal and chemical values |
| 07/16/1997 | EP0568670B1 Regeneration of hydrochloric acid |
| 07/16/1997 | CN1154416A Extraction of rare earth elements |
| 07/16/1997 | CN1154415A Extraction of rare earth elements |
| 07/09/1997 | EP0782634A1 Leaching of precious metal ore with fluoroaliphatic surfactant |
| 07/09/1997 | EP0782577A1 Asymmetric ligands useful for transition metal catalyzed bond forming reactions and epoxide reactions therewith |
| 07/09/1997 | CN1153826A Ammonia soaked copper sulfate process capable of being industrialized |
| 07/08/1997 | US5645708 Chloride assisted hydrometallurgical copper extraction |
| 07/02/1997 | CN1153538A Use of hydrocarbon-soluble aminomethylene phosphonic acid derivs. in solvent extraction of iron ions from aqueous solutions |
| 07/02/1997 | CN1153220A Process for recovery of gold and silver from tailings by resin process |
| 07/02/1997 | CN1153219A Method for extraction of gold from coal-oil gold-carried aggregate (gold chamber) |
| 07/01/1997 | US5642863 Method of extracting metals from ore material |
| 06/25/1997 | EP0700315A4 Multi-stage water treatment system |
| 06/25/1997 | CN1152884A 流体萃取 Fluid Extraction |
| 06/25/1997 | CN1152621A Method for extracting silver and gold in difficult infusion independent silver mine by flotating silver concentrate ore |
| 06/24/1997 | CA2084714C Bioleaching method for the extraction of metals from coal fly ash using thiobacillus |
| 06/24/1997 | CA2054932C Extraction of metal oxides from coal fly ash by microorganisms and a new microorganism useful therefor |
| 06/19/1997 | DE19547151A1 Separation and recovery of heavy metals such as cadmium@ and mercury@ from old batteries |
| 06/18/1997 | CN2256425Y Mixing bath for bacteria oxidation |
| 06/18/1997 | CN1152260A Fluid extraction of metal and/or metalloid |
| 06/17/1997 | US5639433 Extraction of rare earth elements using alkyl phosphinic acid or salt/alkyl or aryl phosphonic acid or ester blends as extractant |
| 06/11/1997 | CN1151443A Recovery method of rhodium |
| 06/11/1997 | CN1151442A Impurity-removing method of extracting weathered superficial leaching rare-earth ore |
| 06/10/1997 | US5637210 System for treating aqueous solutions containing industrial wastes |
| 06/04/1997 | EP0776378A1 Hydrometallurgical conversion of zinc sulfide to sulfate from zinc sulfide containing ores and concentrates |
| 06/04/1997 | CN1150975A Technology of preparing high purity neodymia with ion exchange method |
| 05/28/1997 | EP0775753A1 Process for recovering scandium from nickel-containing oxide ore |
| 05/28/1997 | EP0723599B1 Recovery of palladium catalyst |
| 05/27/1997 | US5632963 Process for the removal of impurity elements from solutions of valuable metals |
| 05/21/1997 | EP0764138A4 Treatment of leach liquors for upgrading a titaniferous material |
| 05/21/1997 | EP0741802A4 Leaching of titaniferous materials |
| 05/15/1997 | DE19542360A1 Precipitating free and complex bonded silver from waste and photographic processing solutions |
| 05/14/1997 | EP0773301A1 Hydrometallurgical treatment for the purification of waelz oxides through lixiviation with sodium carbonate |
| 05/14/1997 | CN1149552A Technology for producing high-purity active zinc oxide by ammonia water circulation complexation method |
| 05/13/1997 | US5628817 Method for leaching nickel-copper matte employing substantially neutral leaching solutions |
| 05/09/1997 | WO1997016575A1 Extracting metals directly from metal oxides |
| 05/09/1997 | WO1997016574A1 A method for the treatment of bismuth-containing sulphide ores or concentrates of such ore |
| 05/09/1997 | WO1997016230A1 Metallurgical dust recycle process |
| 05/09/1997 | CA2236575A1 Extracting metals directly from metal oxides |
| 05/07/1997 | EP0771370A1 Process for electrochemically dissolving a metal such as zinc or tin |
| 05/07/1997 | EP0719346A4 Ilmenite processing using cold milling |
| 05/07/1997 | CN1034818C Extractant for separating rare-earth metal |
| 05/06/1997 | US5626816 Cartridges containing metal of higher electromotive force |
| 05/06/1997 | US5626739 Electrokinetic leaching |
| 05/06/1997 | US5626648 Laterite ore or sulfidic ore |
| 05/06/1997 | US5626647 Method for recovering gold and other precious metals from carbonaceous ores |
| 05/02/1997 | EP0700365A4 Method for recovering metals from solutions |
| 05/01/1997 | WO1997015693A1 Method of concentrating carbonate-containing phosphate raw material |
| 04/30/1997 | CN1034744C Method for extracting cerium-rich solution |
| 04/30/1997 | CN1034743C Process for making rare-earth material liquid from bastnae site |
| 04/30/1997 | CN1034716C Electrostatic quast liquid membrane high efficient concentration method |
| 04/29/1997 | US5624646 Method for improving the brightness of aluminum hydroxide |
| 04/24/1997 | WO1997014825A1 Process for making copper metal powder, copper oxides and copper foil |
| 04/24/1997 | WO1997014818A1 Gold extraction process including bioflotation |
| 04/23/1997 | EP0719347B1 Method for removing zinc from sulphured concentrates |
| 04/23/1997 | EP0717783A4 Upgrading titaniferous materials |
| 04/23/1997 | EP0685001B1 Process for the treatment of electric arc furnace dust |
| 04/23/1997 | CN1148413A Treatment of leach liquors for upgrading titaniferous material |
| 04/23/1997 | CN1148412A Leaching of titaniferous material |
| 04/23/1997 | CN1148079A Method of eliminating mercury from liquid hydrocarbons |
| 04/23/1997 | CN1034674C Recovery method of rhodium |
| 04/22/1997 | US5622679 Extraction of rare earth elements using alkyl phosphinic acid or salt/tetraalkylammonium salt as extractant |
| 04/16/1997 | CN1147559A Water-chlorine process for gold extraction |
| 04/16/1997 | CN1034593C Process for preparing zinc oxide |
| 04/16/1997 | CN1034592C Method for producing cupric sulfate from lowgrade oxide copper ore |
| 04/15/1997 | US5620936 Tantalum and niobium salts |
| 04/10/1997 | WO1997012998A1 Battery paste recycling process |
| 04/09/1997 | EP0766749A1 Use of hydrocarbon-soluble aminomethylene phosphonic acid derivatives in the solvent extraction of iron ions from aqueous solutions |
| 04/09/1997 | CN1146973A Process for production of nm. alumina |
| 04/09/1997 | CN1034517C Preparation of highly purity manganese sulfate solution with high yield |
| 04/08/1997 | US5618502 Zirconium and hafnium separation in sulfate solutions using continuous ion exchange chromatography |
| 04/08/1997 | US5617955 Dynamic-mining system comprising hydrated multiple recovery sites and related methods |
| 04/03/1997 | WO1997012078A1 Electrochemical system |
| 04/03/1997 | WO1997012071A1 Recovery of vanadium |
| 04/03/1997 | WO1997012070A1 Process and apparatus for extracting metal |
| 04/03/1997 | WO1996039702A3 Methods and agents for the extraction of cesium and strontium from nuclear waste |
| 04/03/1997 | CA2232970A1 Electrochemical system |
| 04/02/1997 | CN1146734A Reactor trays for a vertical staged polycondensation reactor |
| 04/01/1997 | CA2049276C Method of tellurium separation from copper electrorefining slime |
| 03/27/1997 | WO1997011202A1 Process for the hydrometallurgical extraction of precious metals from raw material that is difficult to process |
| 03/26/1997 | EP0764138A1 Treatment of leach liquors for upgrading a titaniferous material |
| 03/26/1997 | EP0764042A1 Fluid extraction |
| 03/26/1997 | CN2250360Y Extracting apparatus for CuO |
| 03/26/1997 | CN1146169A Process for treatment of contaminated land |
| 03/26/1997 | CN1146163A Process for treatment of contaminated material |
| 03/26/1997 | CN1146162A Process for treatment of contaminated material |
| 03/19/1997 | EP0762918A1 Fluid extraction of metals and/or metalloids |