| Patents for C22B 19 - Obtaining zinc or zinc oxide (2,969) |
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| 06/13/1991 | WO1991008317A1 Zinc smelting |
| 05/30/1991 | WO1991007225A1 Condensation of metal vapours in a fluidized bed |
| 05/22/1991 | EP0428194A1 Process for treating Jarosite containing residues |
| 05/21/1991 | US5017346 Leaching with sulfur dioxide |
| 05/15/1991 | EP0427699A1 Method and apparatus for treating zinc concentrates |
| 05/11/1991 | CA2029644A1 Method and apparatus for treating zinc ore concentrates |
| 05/08/1991 | CN1051202A Separation of zn-cd alloy by vacuum distillation |
| 05/07/1991 | US5013532 Method for recycling electric arc furnace dust |
| 04/25/1991 | CA2027973A1 Method of reprocessing jarosite-containing residues |
| 04/17/1991 | CN1012378B Recovery technique of zinc oxide by treatment of dust during smelting copper from copper ash |
| 04/16/1991 | CA1282966C Method for slag fuming and reduction |
| 04/16/1991 | CA1282965C Zinc recovery from furnace dust |
| 04/03/1991 | EP0420525A2 Recycling metal containing compositions |
| 03/29/1991 | CA2020757A1 Recycling metal containing compositions |
| 03/26/1991 | CA1281907C Metallurgical composites and processes |
| 03/21/1991 | WO1991003424A1 Biomining of gallium and germanium containing ores |
| 02/16/1991 | WO1991002825A1 Absorption of zinc vapour in molten lead |
| 02/16/1991 | CA2064718A1 Absorption of zinc vapour in molten lead |
| 02/13/1991 | CN2071190U Small power saving distillation and extracting device |
| 02/12/1991 | US4992248 Method for neutralizing sulfuric acid containing zinc ion |
| 02/07/1991 | DE3925838A1 Recycling zinc and phosphate form phosphating plant sludge - by vaporising in presence of sand and coal at high temp. |
| 01/23/1991 | EP0372057A4 Depressant for flotation separation of polymetallic sulphidic ores |
| 01/22/1991 | CA1279198C Zinc smelting process using oxidation zone and reduction zone |
| 01/09/1991 | CN1011143B Metallurgical composites and processes |
| 01/02/1991 | CA1278432C Condensation of zinc vapour |
| 12/13/1990 | DE4000935C1 Recovering zinc from dross from hot dip galvanising plant - by loading dross into vessel and milling between paddle, fixed paddle and plates and withdrawing lighter dross |
| 11/21/1990 | CN1010485B Process for the pressure oxidation of acid leaching of non-ferrous metal and iron-containing sulphide |
| 11/20/1990 | US4971662 Hydrometallurgical recovery of metal values from cooper containing sulphide materials |
| 11/07/1990 | CN1046761A Wet smelting zinc |
| 11/04/1990 | WO1990013679A1 A novel process for the treatment of zinc sulphide containing ores and/or concentrates |
| 11/04/1990 | CA2055427A1 Process for the treatment of zinc sulphide containing ores and/or concentrates |
| 10/16/1990 | US4963182 Continuous feed shaft retort process for recovery of non-ferrous metals from process dust |
| 10/11/1990 | DE3911060A1 Process for reducing the iron content of molten zinc |
| 09/19/1990 | EP0387479A1 Continuous feed shaft retort process and apparatus for recovery on non-ferrous metals |
| 07/31/1990 | CA1272020A1 Apparatus for the pyrometallurgical processing of fine-grained solids to make molten products |
| 07/10/1990 | US4940487 Process for utilizing of zinc-containing metallurgical dusts and sludges |
| 07/04/1990 | CN1043530A Technology for directly producing metals from zinc lead antimony sulphate mine |
| 06/13/1990 | EP0372057A1 Depressant for flotation separation of polymetallic sulphidic ores |
| 06/06/1990 | EP0371832A1 Recovery of Gallium contained in aqueous solutions |
| 05/23/1990 | CN1008118B Prepn. of znso4 and active zno from zinc ore by entire wet-process |
| 05/08/1990 | CA1268634A1 Recovery of base metal values from base metal- and iron-bearing sulfide materials |
| 02/28/1990 | EP0356136A2 A method for neutralizing sulfuric acid containing zinc ion |
| 02/28/1990 | CN1040013A Method for producing high purity zinc oxide |
| 01/23/1990 | US4895595 Oxidation and reduction zones |
| 12/26/1989 | US4889694 Recovery of zinc values from zinc and iron-bearing sulfide materials |
| 12/13/1989 | EP0197071B1 Production of zinc from ores and concentrates |
| 12/07/1989 | DE3818075A1 Process for preventing emissions from hot zinc ashes |
| 11/16/1989 | WO1989010791A1 Depressant for flotation separation of polymetallic sulphidic ores |
| 11/07/1989 | US4878943 Iron oxide reduction, sponge iron, cooling, dedusting |
| 11/01/1989 | CN1036798A Process for utilizing of zinc-containing metallurgical dusts and sludges |
| 10/31/1989 | US4877517 Using crosslinked starch, polyacrylate, and lignin sulfonate |
| 10/24/1989 | US4876074 Method for separating zinc out of a hot gas containing zinc vapour |
| 10/11/1989 | EP0336923A2 Process for valorization of zinciferous flue dusts and muds |
| 10/05/1989 | WO1989009289A1 A process of recovering non-ferrous metal values, especially nickel, cobalt, copper and zinc, by using melt and melt coating sulphation, from raw materials containing said metals |
| 10/03/1989 | US4871147 Apparatus for the pyrometallurgical processing of fine-grained solids |
| 09/26/1989 | CA1260429A1 Electrochemical production of zinc in membrane cell using chloride and copper ions |
| 08/08/1989 | CA1258180A1 Leaching process of zinc and iron containing sulphides |
| 05/31/1989 | CN1033196A Recovery technique of zinc oxide by treatment of dust during smelting of copper from copper ash |
| 05/23/1989 | US4832925 Leaching, oxidation, precipitation of impurities |
| 05/17/1989 | EP0316299A2 Process of dezincifying a material flow operating a pig-iron production plant |
| 04/20/1989 | DE3734204A1 Process for reducing the iron content of zinc melts |
| 04/11/1989 | US4820417 Use of citric acid partial esters for the extraction of iron |
| 04/11/1989 | US4820340 Reduction to form metal vapors, oxidation of vapors, recovery of zinc, lead |
| 03/08/1989 | CN1031565A Vacuum extraction of silver, bismuth and zinc from bismuth-silver-zinc-containing shell |
| 02/28/1989 | CA1250411A1 System for dissolution-purification of zn-containing materials |
| 02/07/1989 | US4802919 Heating in reducing slag with carbonaceous material |
| 01/24/1989 | US4800069 Haliding a metal ferrite |
| 01/18/1989 | CN1030444A Process for treatment of ores or concentrates of lead sulfuride and/or lead-zinc sulfuride |
| 12/29/1988 | DE3719583A1 Method for reprocessing Zn- and Pb-containing wastes |
| 12/06/1988 | US4789529 Recovery of zinc from zinc bearing sulphidic ores and concentrates by controlled oxidation roasting |
| 12/06/1988 | US4789446 Method of processing residues from the hydrometallurgical production of zinc |
| 10/27/1988 | DE3811594A1 Method for processing lead-containing or lead- and zinc-containing sulphide ores and/or concentrates |
| 10/18/1988 | US4778520 Preferentially dissolves zinc oxide over iron oxides |
| 09/27/1988 | US4773630 Tank furnace for the metallurgical treatment of non-ferrous metals |
| 08/31/1988 | EP0280144A2 Use of citric-acid esters and of mixtures of these esters in extracting iron |
| 08/23/1988 | US4765829 Treating lead- and zinc-containing steelmaking byproducts |
| 08/03/1988 | CN86108798A Prepn. of znso4 and active zno from zinc ore by entire wet-process |
| 08/02/1988 | CA1239798A1 Process for recovering valuable metals from an iron dust containing a higher content of zinc |
| 07/27/1988 | EP0276032A1 Instant smelting process for sulfidic ores |
| 07/27/1988 | EP0275863A1 Method and apparatus for reclaiming metal values from electric arc furnace flue dust and sludge and rendering residual solids recyclable or non-hazardous |
| 07/19/1988 | US4758268 Method and apparatus for reclaiming metal values from electric arc furnace flue dust and sludge and rendering residual solids recyclable or non-hazardous |
| 07/12/1988 | CA1239020A1 Method for recovering zinc from substances containing a zinc compound |
| 07/12/1988 | CA1239019A1 Solvent extraction process for recovery of zinc |
| 05/03/1988 | US4741770 Zinc smelting process using oxidation zone and reduction zone |
| 04/27/1988 | CN86107218A New technology in preparation of zinc oxide from the filter residue of sodium hydrosulphite |
| 04/13/1988 | EP0263539A1 Process for treating zinc hydrometallurgy residues |
| 03/31/1988 | DE3632660A1 Integrated process for preparing oxidants (oxidizing agents) containing manganese and/or zinc compounds |
| 03/10/1988 | WO1988001654A1 Process for the treatment of lead-zinc ores, concentrates or residues |
| 02/23/1988 | CA1233027A1 Method for recovering the metal values from materials containing tin and/or zinc |
| 01/26/1988 | US4721605 Selective removal of metals from aqueous solutions with dithiophosphinic acids |
| 01/19/1988 | US4720373 Solids refining apparatus |
| 01/14/1988 | DE3641136C1 Metallurgical vessel |
| 01/13/1988 | EP0252698A1 Process for agglomeration of oxidic and metallic solids |
| 12/01/1987 | US4710277 Method for manufacturing zinc hydrometallurgically |
| 11/11/1987 | EP0244433A1 Method for separation and recovery of metals from mixtures of metal sulfides such as lead ores |
| 11/10/1987 | US4705260 Furnace for heating and melting zinc |
| 10/27/1987 | CA1228483A1 Process for the pressure oxidation acid leaching of non-ferrous metal and iron-containing sulphidic material |
| 09/22/1987 | US4695319 Metal distillation method utilizing double vaporization |
| 08/25/1987 | US4689146 Ion exchanging for separating heavy metal precipitation; ion separation |
| 08/18/1987 | US4687513 Condensation of zinc vapor |