| Patents for C22B - Production or refining of metals; Pretreatment of raw materials (459) |
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| 07/20/1993 | US5228904 Reduction |
| 06/23/1993 | EP0449890A4 Process for the production of metals, alloys and ceramic materials |
| 06/22/1993 | CA1319452C Recovery of gold using diisobutyl and disec. butyl monothiophosphinates |
| 04/28/1993 | EP0538278A1 Reclamation of metal from scrap. |
| 11/11/1992 | CN1066088A Improved heater arrangement for aluminum refining systems |
| 10/28/1992 | EP0510701A2 Improved heater arrangement for aluminum refining systems |
| 06/09/1992 | US5120027 Oxidation and corrosion resistance heating elements |
| 03/25/1992 | EP0476079A1 Method for cleaning and recovering metal mercury from roasting gases containing it |
| 01/26/1992 | CA2041719A1 Process for the enhanced production of silver from gold and silver bearing ore |
| 01/14/1992 | CA1294131C Process for reduction smelting of materials containing base metals |
| 01/07/1992 | WO1992001074A1 Reclamation of metal from scrap |
| 01/07/1992 | CA2086253A1 Reclamation of metal from scrap |
| 12/03/1991 | CA1292623C Extraction of metal values from ores or concentrates |
| 11/26/1991 | CA2043245A1 Recovery of metals from insoluble metal oxides by microorganisms |
| 10/09/1991 | EP0449890A1 Process for the production of metals, alloys and ceramic materials. |
| 09/24/1991 | CA2038580A1 Biological oxidation of sulfide ore |
| 09/06/1991 | WO1991014010A1 Method for cleaning and recovering metal mercury from roasting gases containing it |
| 09/06/1991 | CA2054744A1 Method for cleaning and recovering metal mercury from roasting gases containing it |
| 07/23/1991 | US5034055 Process for the enhanced production of silver from gold and silver bearing ore |
| 07/02/1991 | US5028260 Recovery of gold from acidic solutions |
| 05/28/1991 | CA1284471C Separation process |
| 05/22/1991 | EP0428194A1 Process for treating Jarosite containing residues |
| 04/25/1991 | CA2027973A1 Method of reprocessing jarosite-containing residues |
| 04/24/1991 | EP0423490A1 Friable particles and processes for preparing same |
| 03/27/1991 | CN1050145A Alumina particles |
| 03/19/1991 | CA2025116A1 Method for gold recovery using chlorine dioxide solution |
| 02/02/1991 | CA2022417A1 Interstage screen |
| 01/16/1991 | EP0408185A2 Recovery of gold from acidic solutions |
| 10/24/1990 | EP0393785A1 Alkylene oxide catalysts having enhanced activity and/or stability |
| 08/28/1990 | US4952389 Fluized bed catalyst carriers for high temperature steam processes; friable, porous spheres; agglomerating with clay, deagglomeration |
| 08/28/1990 | CA1273209A1 Utilization of oxygen in leaching and/or recovery procedures employing carbon |
| 08/15/1990 | CN1009208B Injection of substances into high temp. liquids |
| 08/08/1990 | CN1044501A Method and apparatus for mfg. high-grade nickel matte |
| 06/28/1990 | WO1990007012A1 Process for the production of metals, alloys and ceramic materials |
| 06/22/1990 | CA2006402A1 Process for the production of metals, alloys and ceramic materials |
| 04/29/1990 | CA2001632A1 Prevention of copper dissolution during cyanidation of gold ores |
| 04/25/1990 | EP0264385B1 Injection of substances into high temperature liquids |
| 04/20/1990 | CA2001064A1 Process for treatment of ores |
| 02/13/1990 | US4900357 Injection of substances into high temperature liquids |
| 05/17/1989 | EP0316094A2 Separation process |
| 03/22/1989 | CN1031860A Chemical/biological process to oxidize multimetallic sulphide ores |
| 09/27/1988 | CA1242320A1 Apparatus for introducing substances into liquids e.g. metal melts |
| 08/16/1988 | CA1240594A1 Removal of hydrogen from cobalt and nickel metal by heat treating same in a rotary heat source |
| 05/03/1988 | CA1235907A1 Recovery of gold from refractory auriferous iron- containing sulphidic concentrates |
| 04/27/1988 | EP0264385A1 Injection of substances into high temperature liquids. |
| 04/12/1988 | CA1234991A1 Recovery of gold from auriferous refractory iron- containing sulphidic ore |
| 01/19/1988 | CA1231514A1 Method of making yttrium silicon oxynitrides |
| 01/14/1988 | WO1988000248A1 Separation process |
| 12/09/1987 | EP0248518A1 Separation of nickel from copper in autoclave |
| 11/11/1987 | EP0244921A2 Method for recovering platinum in a nitric acid plant |
| 10/20/1987 | US4701215 Apparatus for introducing substances into liquids e.g. metal melts |
| 09/23/1987 | CN87102178A Injection of substances into high temperature liquids |
| 09/02/1987 | EP0234852A1 Injection of substances into high temperature liquids |
| 08/27/1987 | WO1987005051A1 Injection of substances into high temperature liquids |
| 08/18/1987 | US4687514 Process for the recovery of noble metals from solutions |
| 08/04/1987 | US4684404 Extraction of gold from ores |
| 06/23/1987 | CA1223185A1 Dissolution of noble metals |
| 06/23/1987 | CA1223126A1 Process for recovering zinc from ferrites |
| 04/14/1987 | CA1220345A1 Process for the recovery of noble metals from ores |
| 04/01/1987 | EP0126132B1 Apparatus for introducing substances into liquids e.g. metal melts |
| 01/31/1987 | CN85101709A Method and plant for reducing oxidic material while simultaneously generating a gas suitable as fuel gas |
| 01/14/1987 | EP0061468B1 Recovery of silver from ores and concentrates |
| 01/10/1987 | CN85101919A Method for recovering the metal values from materials containing tin and/or zinc |
| 01/07/1987 | EP0207224A1 Apparatus for introducing substances into liquids e.g. metal melts |
| 12/23/1986 | CA1215722A1 Method of preparing alkali metal salts of organic diamines |
| 12/09/1986 | CA1214943A1 Recovery of metal values from a pulp containing such values in dissolved form |
| 10/21/1986 | CA1212840A1 Control of silica scaling during acid leaching of lateritic ore |
| 10/08/1986 | CN85101039A Method and plant for reducing oxidic material while simultaneously generating a gas suitable for the recovery of thermal energy |
| 10/07/1986 | US4615731 Hydrometallurgical processing of precious metal-containing materials |
| 09/16/1986 | USRE32247 Process for the direct production of steel |
| 09/16/1986 | CA1211338A1 Insoluble compositions |
| 09/02/1986 | CA1210593A1 Process for the sulfatization of non-ferrous metal sulfides |
| 06/17/1986 | CA1206008A1 Recovery of zinc from zinc-containing sulphidic material |
| 05/20/1986 | CA1204597A1 Process for recovering noble metals from solutions |
| 04/09/1986 | EP0177291A2 Recovery of gold from auriferous refractory iron-containing sulphidic ore |
| 04/09/1986 | EP0177290A2 Recovery of gold from refractory auriferous iron-containing sulphidic concentrates |
| 03/11/1986 | US4575393 Metallurgy |
| 02/18/1986 | US4571264 Recovery of gold from refractory auriferous iron-containing sulphidic ore |
| 02/18/1986 | US4571263 Recovery of gold from refractory auriferous iron-containing sulphidic concentrates |
| 12/31/1985 | US4561947 Process for the recovery of noble metals from ores; which process uses thiourea |
| 10/29/1985 | CA1195846A1 Recovery of zinc from zinc-containing sulphidic material |
| 08/28/1985 | EP0152756A1 Method of preparing alkali metal salts of organic diamines |
| 07/16/1985 | CA1190401A1 Process for treating sulphated lead compounds for recovering metallic lead and a high-purity sulphate and an installation therefor |
| 06/04/1985 | US4521627 Transition metal catalyst |
| 04/23/1985 | CA1185956A1 Foraminate element for the recovery of platinum metal and method of using same |
| 04/09/1985 | US4510028 Process for recovering zinc from zinc ferrite material |
| 01/31/1985 | WO1985000384A1 Improvements in or relating to the dissolution of noble metals |
| 01/15/1985 | CA1180903A1 Separation of cobalt and nickel |
| 12/11/1984 | CA1179143A1 Process for the exploitation of oxidic, vanadium- bearing titanium ores |
| 11/28/1984 | EP0126132A1 Apparatus for introducing substances into liquids e.g. metal melts. |
| 10/30/1984 | CA1176853A1 Process for recovering zinc from zinc ferrite material |
| 08/29/1984 | EP0116756A1 Apparatus for introducing substances into liquids e.g. metal melts |
| 07/24/1984 | CA1171287A1 Acid leaching of lateritic nickel ores |
| 07/24/1984 | CA1171286A1 Recovery of silver and gold from ores and concentrates |
| 06/07/1984 | WO1984002147A1 Apparatus for introducing substances into liquids e.g. metal melts |
| 04/17/1984 | US4443253 Recovery of zinc from zinc containing sulphidic materials |
| 04/03/1984 | US4440569 Recovery of zinc from zinc-containing sulphidic material |
| 01/11/1984 | EP0097842A2 Process for recovering noble metals from solutions |
| 12/21/1983 | EP0096499A1 Recovery of zinc from zinc-containing sulphidic material |
| 11/01/1983 | CA1156380A1 Selective flotation of nickel sulfide ores |