| Patents for C22B 19 - Obtaining zinc or zinc oxide (2,969) |
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| 11/07/1978 | US4124462 Solvent extraction |
| 10/31/1978 | CA1041304A1 Process for recovering valuable metals from sulfate solutions |
| 10/24/1978 | CA1040868A1 Process for recovery of valuable metals from solution using neutralization by lime or limestone |
| 10/24/1978 | CA1040867A1 Separation of iron from zinc solutions or slurries |
| 10/10/1978 | US4119699 Method for wet metallurgical processes |
| 09/12/1978 | CA1038171A1 Process for the treatment of zinc sulphide |
| 08/22/1978 | US4108744 Dialyzing, complexing with sodium chloride, ion exchanging |
| 08/22/1978 | US4108640 Hydrometallurgical process for the production of cobalt powder from mixed metal sulphides |
| 08/15/1978 | US4107265 Treating residues from the leaching of roasted zinc blende |
| 08/08/1978 | US4105743 Selectively extracting copper, zinc, nickel from a mixture of metal hydroxides |
| 07/04/1978 | US4098870 Acid leaching of nickeliferous oxide ores with minimized scaling |
| 05/23/1978 | US4090871 Process for the recovery and purification of germanium from zinc ores |
| 05/09/1978 | US4088310 Apparatus for suspension smelting of finely-grained oxide and/or sulfide ores and concentrates |
| 03/28/1978 | US4081506 Drying, grinding, roasting with sulfur, leaching |
| 02/21/1978 | US4075008 Method for the reclamation of zinc from galvanizing baths |
| 02/07/1978 | US4072503 Thermal treatment of leaching residue from hydrometallurgical zinc production |
| 01/31/1978 | US4071357 Process for recovering zinc from steel-making flue dust |
| 01/31/1978 | US4071228 Method of recovering valuable metals from zinc bearing materials and blast furnace relevant thereto |
| 01/24/1978 | US4070437 Process for the recovery of metal chlorides from jarosite sludges resulting from the sulphuric acid processing of ores |
| 01/24/1978 | US4070260 Process of sulfuric acid leaching silicated zinc ores |
| 01/17/1978 | US4069315 Recovery of zinc from iron-making or steel-refining furnace dust |
| 11/08/1977 | US4057422 Extraction, dehydration, sulfiding, oxidation, precipitation |
| 11/08/1977 | US4057232 Press for separating molten metal from dross |
| 10/11/1977 | US4053552 Leaching, solvent extraction with an organo acid phosphate; hydrometallurgical purification |
| 09/20/1977 | US4049514 Electrowinning, leaching, forming copper arsenate |
| 09/13/1977 | US4047938 Process for refining molten metal |
| 08/23/1977 | US4043802 Purification, crystallization |
| 08/16/1977 | US4042379 Condensation of zinc vapor |
| 06/21/1977 | US4030917 Hydrometallurgical processing of metal sulfides |
| 04/26/1977 | US4020105 Oxime |
| 04/12/1977 | US4017307 Or metal combinations with the aid of a melting cyclone |
| 03/22/1977 | US4013412 Method for judging purity of purified zinc sulphate solution used for electrolytic production of zinc |
| 03/08/1977 | US4011146 Process for separation and recovery of metal values from sulfide ore concentrates |
| 03/08/1977 | US4010937 Method and apparatus of refining crude cadmium |
| 02/15/1977 | US4008364 Distillation column in vacuum casing |
| 02/15/1977 | US4008076 Hydrometallurgy |
| 02/01/1977 | US4006215 Recovering iron, nickel, or cobalt from sulfate solution |
| 01/25/1977 | US4005174 Process for the elimination of chloride from zinc sulphate solutions |
| 01/25/1977 | US4004991 Sulfuric acid |
| 01/18/1977 | US4003559 Apparatus for recovery of metallic zinc from dross |
| 12/28/1976 | US3999982 Injecting sulfur dioxide |
| 12/21/1976 | US3998628 Leaching with copper or iron chlorides, injecting chlorine |
| 12/21/1976 | US3998627 Process for recovering metals from metal ammine bearing ammonium salt solutions using ion exchange resin |
| 11/30/1976 | US3994721 Purifying a zinc-bearing solution by cementation |
| 11/23/1976 | US3993293 Automatic leaching system for hydro-metallurgical production of zinc |
| 11/02/1976 | US3989607 Copper di(2-ethylhexyl)phosphate |
| 10/12/1976 | US3985857 Process for recovering zinc from ferrites |
| 10/05/1976 | US3984235 Treatment of converter slag |
| 09/28/1976 | US3983210 Ferric oxide or hydroxide as precipitating agent |
| 09/21/1976 | US3981966 Zinc recovery from acidic aqueous streams |
| 09/21/1976 | US3981962 Decomposition leach of sulfide ores with chlorine and oxygen |
| 09/07/1976 | US3979266 Process for purifying aqueous solutions, of metal ions precipitating as arsenides, antimonides, tellurides, and selenides |
| 08/24/1976 | US3976743 Treatment of zinc plant residue |
| 08/24/1976 | US3976472 Method and an electrically heated device for producing molten metal from powders or lumps of metal oxides |
| 08/17/1976 | US3975188 Arc heater reduction of zinc roast |
| 08/10/1976 | US3973949 Sulfide ores |
| 07/13/1976 | US3969107 Combined process for working up pure and complex copper concentrates |
| 06/01/1976 | US3960548 Process for the separation of components in multicomponent mixtures, for the case wherein the diagram of binary phases of the two major components presents a monotectic and their densities are different |
| 05/25/1976 | US3959437 Hydrometallurgical process for the recovery of zinc, copper and cadmium from their ferrites |
| 05/25/1976 | US3958985 Inorganic acids, heat treatment |
| 05/18/1976 | US3957503 Extraction of zinc and lead from their sulfides |
| 05/04/1976 | US3954937 Sulfuric acid, lixiviation |
| 05/04/1976 | US3954452 Polyacrylamide flocculant |
| 05/04/1976 | US3954450 Recovery of lead, zinc and iron sulfide |
| 04/27/1976 | US3953306 Metal recovery from waste treatment sludges |
| 03/23/1976 | US3946098 Pelletizing, heat treatment, zinc oxide, lead oxide, briquets |
| 03/23/1976 | US3945817 Method for the collection of dust of a high zinc content during the production of reduced iron pellets |
| 03/02/1976 | US3941609 Protective coating |
| 01/20/1976 | US3933478 Recovery of zinc and copper from brass scrap |