| Patents for C22B - Production or refining of metals; Pretreatment of raw materials (459) |
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| 11/01/1983 | CA1156052A1 Recovery of metal values |
| 10/18/1983 | US4410498 Acid leaching of nickel from serpentinic laterite ores |
| 10/04/1983 | CA1154599A1 Hydrometallurgical processing of precious metal-containing materials |
| 09/21/1983 | EP0089254A1 Control of silica scaling during acid leaching of lateritic ore |
| 09/20/1983 | CA1153896A1 Process for recovering copper |
| 08/30/1983 | CA1152754A1 Process for the recovery of gold from carbonaceous ores |
| 08/16/1983 | US4399109 Control of silica scaling during acid leaching of lateritic ore |
| 07/19/1983 | US4394357 Separation of cobalt and nickel by oxidative precipitation with peroxymonosulfuric acid |
| 06/28/1983 | CA1148748A1 Recovery of precious metals from difficult ores |
| 05/10/1983 | CA1145952A1 Process for selective leaching of nickel- copper matte |
| 04/20/1983 | EP0077121A2 Method for recovering platinum in a nitric acid plant |
| 04/19/1983 | CA1144934A1 Solution of organic or mineral salts in organic solvents |
| 02/16/1983 | EP0071684A1 Process for recovering zinc from zinc ferrite material |
| 02/16/1983 | EP0061468A4 Recovery of silver from ores and concentrates. |
| 10/06/1982 | EP0061468A1 Recovery of silver from ores and concentrates. |
| 09/21/1982 | CA1131917A1 Treatment of zinc plant leach residues for recovery of the contained metal values |
| 08/10/1982 | US4343745 Complexing with a teriary amine ether |
| 04/15/1982 | WO1982001195A1 Recovery of silver and gold from ores and concentrates |
| 04/07/1982 | EP0049169A2 Hydrometallurgical processing of precious metal-containing materials |
| 04/06/1982 | US4323541 Selective two stage leaching of nickel from nickel-copper matte |
| 04/06/1982 | CA1121162A1 Method and arrangement for carbothermic production of aluminum |
| 03/30/1982 | CA1120690A1 Process for the recovery of cobalt from its impure, aqueous, in particular nickel-bearing, solutions and catalyst therefore |
| 02/16/1982 | CA1118210A1 Process for separating iron from an organic extraction medium |
| 01/26/1982 | CA1116872A1 Hydrometallurgical process for extracting zinc |
| 12/15/1981 | CA1114158A1 Gas distributing closure plug for metallurgical reactor |
| 12/01/1981 | CA1113258A1 Method for controlling the heat content and evening out temperatures in various sulfidizing processes |
| 09/15/1981 | CA1108867A1 Hydrometallurgical process for the treatment of sulphidized compounds containing lead |
| 08/18/1981 | CA1107076A1 Gold extraction |
| 06/30/1981 | CA1103939A1 Hydrometallurgical process for the treatment of soluble silicate-bearing materials |
| 05/26/1981 | US4269622 Using a leach solution containing ammonium thiosulfate and copper while maintaining a basicity with ammonia and also a sulfite ion concentration; gold and silver |
| 04/14/1981 | US4261737 Leaching ore with ammoniacal ammonium salt solution, adsorption oncarbon which has been pretreated with acid |
| 02/24/1981 | CA1096514A1 Use of thiouracils as selective depressants for the flotation separation of copper and nickel sulphide minerals |
| 01/20/1981 | CA1093840A1 Process for the recovery of the metal values of complex pyrites |
| 10/01/1980 | EP0016673A1 Process for the solubilization of organic or mineral salts in organic solvents and complexes of organic or mineral salts |
| 07/29/1980 | CA1082468A1 Chlorine leaching of nickel matte |
| 06/17/1980 | US4208380 Process for the recovery of cobalt from its impure, aqueous, in particular nickel-bearing, solutions and catalyst therefor |
| 06/17/1980 | CA1079496A1 Process for stabilizing and consolidating residues comprising metal compounds |
| 04/22/1980 | CA1075912A1 Process for the purification of an aqueous solution of zinc sulphate |
| 02/26/1980 | CA1072342A1 Recovery of lead |
| 01/15/1980 | CA1069704A1 Extraction and purification of silver |
| 09/11/1979 | CA1062019A1 Process and device for suspension smelting of finely-divided oxide and/or sulfide ores and concentrates, especially copper and/or nickel concentrates rich in iron |
| 07/03/1979 | CA1057510A1 Process for treating sulfidic complex and mixed ores, concentrates and technical precipitates |
| 04/10/1979 | US4148862 Hydrometallurgical treatment of soluble silicate-bearing zinc materials |
| 03/13/1979 | CA1050280A1 High temperature neutralization of laterite leach slurry |
| 02/27/1979 | CA1049267A1 Method of reclaiming nickel values from a nickeliferous alloy |
| 01/09/1979 | CA1045829A1 Process for zinc and silicium bearing materials to recuperate the zinc content |
| 10/24/1978 | CA1040867A1 Separation of iron from zinc solutions or slurries |
| 09/26/1978 | CA1039065A1 Copper cementation |
| 06/20/1978 | US4096045 Pbcl2, crystallization |
| 01/24/1978 | US4070260 Process of sulfuric acid leaching silicated zinc ores |
| 10/11/1977 | US4053301 Process for the direct production of steel |
| 12/21/1976 | US3998627 Process for recovering metals from metal ammine bearing ammonium salt solutions using ion exchange resin |
| 12/07/1976 | US3996046 Extraction and purification of silver from sulfates |
| 11/16/1976 | US3992270 Iron, nitric acid lixiviation |
| 11/09/1976 | US3991159 High temperature neutralization of laterite leach slurry |
| 10/12/1976 | US3985857 Process for recovering zinc from ferrites |
| 08/24/1976 | US3976743 Treatment of zinc plant residue |
| 05/04/1976 | US3954937 Sulfuric acid, lixiviation |
| 05/04/1976 | US3954450 Recovery of lead, zinc and iron sulfide |