| Patents for C22B 11 - Obtaining noble metals (5,080) |
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| 05/16/1992 | CA2096249A1 Base metals recovery by adsorption of cyano complexes on activated carbon |
| 05/15/1992 | CA2096232A1 Recovery of palladium |
| 05/06/1992 | CN1060875A Process for recovering gold from overflow water of gold mine's tailing store |
| 04/29/1992 | EP0482980A1 Method for recovering platinum group metals, deposited as thin films ou ceramic substrates, from used catalysts |
| 04/21/1992 | CA1298976C Recovery of noble metals |
| 04/15/1992 | EP0479814A1 Dissolving values of platinum group metals from ores and concentrates. |
| 04/14/1992 | US5104445 Extracting metals from ore by contacting with a solid salt to obtain a mixture, heating and chlorination and recovering the metals |
| 04/07/1992 | US5102632 First chlorinating with reducing agent at low temperature, vaporizing and separating, second chlorinating the residue at higher temperature; minimizing the production of aluminum trichloride |
| 03/31/1992 | US5100850 Solvent extraction with hydrogen peroxide and acetic acid to recover rhodium catalyst values from acetic anhydride production process |
| 03/31/1992 | US5100631 Water soluble polymer for agglomerating fines |
| 03/24/1992 | CA1297840C Mineral recovery process |
| 03/17/1992 | US5096946 In mine drainage water, amide reaction product of polyethylenimine and nitrilotriacetic acid, sponge |
| 03/12/1992 | DE4028240A1 Oxygen@ removal from alkaline cyanide soln. contg. noble metal - using oxygen binder and opt. heavy metal catalyst, reducing zinc@ consumption in cementation |
| 03/12/1992 | DE4028239A1 Formamidine sulphinic acid used as oxygen@ binder - pref. in aq. alkaline soln. esp. cyanide soln. contg. noble metal cyano complex for cementation with zinc@ |
| 03/07/1992 | CA2050531A1 Use of formamidine sulfuric acid as an oxygen scavenger |
| 03/07/1992 | CA2050529A1 Process for the removal of oxygen from cyanide leaching solutions containing noble metals before cementation of the noble metals with zinc |
| 02/27/1992 | DE4105224C1 Recovery of precious metal(s) from catalyst - comprises coating ceramic oxide on metal foil which is detachable |
| 02/26/1992 | CN1058996A Direct electrolyzation obtaining gold with steel wool used in cyanide liquid |
| 02/12/1992 | CN1015475B Recovery of precious-metals from ores |
| 02/11/1992 | CA1295486C Extraction of transition metals from organic solutions |
| 02/04/1992 | US5085692 Recovery of silver values from chlorides including silver chloride |
| 01/28/1992 | US5084092 Method of separating metals from catalyst material |
| 01/26/1992 | CA2041719A1 Process for the enhanced production of silver from gold and silver bearing ore |
| 01/21/1992 | CA2047456A1 Process |
| 01/07/1992 | US5078977 Cyanide recovery process |
| 01/07/1992 | CA1293858C Method for the recovery of gold using autoclaving |
| 01/01/1992 | CN1015268B Fragmentation dissolving methof of noble metal |
| 12/31/1991 | US5076839 Precious metal refining with fluorine gas |
| 12/28/1991 | CA2086118A1 Waste materials concentrator |
| 12/24/1991 | US5074910 Chlorination |
| 12/24/1991 | US5074909 Gold and silver recovery method |
| 12/24/1991 | CA1293521C Controlled percolation system and method for heap leach mining |
| 12/17/1991 | US5073354 Recovering the metal cyanide complex by desorbing with aqueous solution of benzoic acid and polyacrylic acids |
| 12/10/1991 | US5071477 Process for recovery of gold from refractory ores |
| 12/10/1991 | US5071476 Recovery silver from photo sensitive materials |
| 12/04/1991 | EP0459854A1 Use of thio-ether ligands for the isolation of palladium from aqueous solutions, particularly from nitric solutions of the irradiated nuclear fuel elements dissolution |
| 12/04/1991 | CN1056714A Use of thioether ligands for separating palladium from aqueous solutions |
| 12/03/1991 | CA1292623C Extraction of metal values from ores or concentrates |
| 11/27/1991 | EP0439536A4 Cyanide recovery process |
| 11/16/1991 | CA2042428A1 Use of thioether ligands for separating palladium from aqueous solutions and in particular nitric solutions for dissolving irradiated nuclear fuel elements |
| 11/14/1991 | DE4017899C1 Extn. of silver and gold from ores - by contacting ore with aq. leaching soln. contg. cyanide in presence of peroxo:borate, and sepg. cyano complexes formed |
| 11/13/1991 | EP0220198B1 Preparing metal compounds by pyrolysis |
| 11/12/1991 | US5064540 Method for using water-treating sponges |
| 11/10/1991 | CA2016492A1 Recovery of platinum group metals (pgm) from acidic solutions by reduction precipitation with sodium borohydride |
| 11/06/1991 | CN1014618B Treatment method for graphite anode in chlorine-soda industry |
| 10/31/1991 | DE4012950A1 Electrolysis cell - has perforated centre tube as anode and flow channel with the cathode concentric round inner wall of housing |
| 10/29/1991 | US5061459 Adding ethoxylated fatty alkyl amine to passivate mineral surface, thus reducing high cyanide consumption |
| 10/16/1991 | EP0451456A1 Hydrometallurgic method for processing raw materials containing zinc sulphide |
| 10/08/1991 | CA1290225C Process for metal recovery and compositions useful therein |
| 09/30/1991 | CA2013537A1 Recovery of gold from solution by reduction-precipitation with stabilized alkali metal borohydride |
| 09/24/1991 | US5051128 Adsorption of a gold-iodine complex on an ion exchange resin, adding sulfuric acid and sodium nitrite and adding sodium sulf ite |
| 09/24/1991 | CA2038580A1 Biological oxidation of sulfide ore |
| 09/18/1991 | CN1013962B Process for recovery of platinum catalyst |
| 09/04/1991 | CN1054268A Extraction and recovery of gold |
| 09/03/1991 | US5045290 Recovery of pure platinum and palladium |
| 08/24/1991 | WO1991013177A1 Extraction and recovery of gold |
| 08/21/1991 | EP0232380B1 Process for purifying silver refinery slimes |
| 08/14/1991 | EP0441210A1 Apparatus with improved flow-through characteristics for the recovery of silver from silver-containing waste fluids |
| 08/08/1991 | WO1991011539A1 Separation process |
| 08/08/1991 | WO1991009145A3 Method for recovering metals from waste liquors |
| 08/07/1991 | EP0439536A1 Cyanide recovery process |
| 07/31/1991 | CN1053451A Recovery method of fine-grained gold from heavy sand |
| 07/30/1991 | CA2034791A1 Apparatus with improved flow-through characteristics for the recovery of silver from silver-containing waste fluids |
| 07/25/1991 | DE4001890A1 Precious metal dissolution and pptn. - using molten alkali metal hydroxide and oxide with alkali metal addn. |
| 07/23/1991 | US5034055 Process for the enhanced production of silver from gold and silver bearing ore |
| 07/10/1991 | CN1052903A Conversion treatment of lead-base gold or lead ores with soda |
| 07/09/1991 | CA1285792C Process for preparing finely divided metal powders |
| 07/03/1991 | EP0435479A1 Metal recovery |
| 07/02/1991 | US5028260 Recovery of gold from acidic solutions |
| 07/02/1991 | US5028259 Recovery of precious metal |
| 06/27/1991 | WO1991009145A2 Method for recovering metals from waste liquors |
| 06/25/1991 | US5026420 Ion exchanging to absorb heavy metals |
| 06/19/1991 | EP0432935A1 Processes to recover and reconcentrate gold from its ores |
| 06/13/1991 | WO1991008316A1 Processes to recover and reconcentrate gold from its ores |
| 06/05/1991 | EP0430323A1 Silver recovery device |
| 06/04/1991 | CA2004475A1 Metal recovery |
| 05/28/1991 | US5019162 Activated carbon for recovery of gold |
| 05/28/1991 | CA2030900A1 Processes to recoverand reconcentrate gold from its ores |
| 05/15/1991 | CN1051369A Synthesis of resin for selectively absorbing gold and the extraction method |
| 05/07/1991 | US5013359 Oxidized with nitric acid, froth flotation |
| 05/03/1991 | CA2002183A1 Noble metal recovery process |
| 05/02/1991 | WO1991005882A1 Silver recovery from spent photographic solutions |
| 05/02/1991 | EP0425102A1 Method for eluting adsorbed gold from carbon |
| 04/24/1991 | EP0423423A1 Remelting apparatus for recovery of metals |
| 04/24/1991 | CN1050933A Silver recovery from spent photograghic solution |
| 04/16/1991 | US5008017 Mixing silver containing sludge with metal bicarbonate and carbonates to form free-flowing powder |
| 04/16/1991 | US5007589 Process for simultaneously leaching and fine milling a subdivided source material |
| 04/12/1991 | CA2000527A1 Silver recovery from spent photographic solutions |
| 04/09/1991 | US5006166 Recovery of noble metals |
| 04/02/1991 | US5004500 Chlorination process for recovering gold values from gold alloys |
| 04/02/1991 | US5004212 Apparatus with improved flow-through characteristics for the recovery of silver from silver-containing waste fluids |
| 03/30/1991 | CA2026249A1 Method for eluting adsorbed gold from carbon |
| 03/26/1991 | US5002984 Product for the absorption of metal ions |
| 03/19/1991 | CA2025116A1 Method for gold recovery using chlorine dioxide solution |
| 03/06/1991 | CA2022398A1 Remelting apparatus and method for recognition and recovery of noble metals and rare earths |
| 02/19/1991 | US4994243 Evaporation of hydrogen cyanide from pH-controlled solutions, then basification; recovering metals from ores |
| 02/19/1991 | CA2023387A1 Polymer product for the selective absorption of dissolved ions |
| 02/16/1991 | CA2023119A1 Extraction of noble metals with thiourea |
| 02/12/1991 | US4992200 Recovery of precious metals |
| 02/12/1991 | US4992097 Metal recovery process |