| Patents for C22B 19 - Obtaining zinc or zinc oxide (2,969) |
|---|
| 09/30/1993 | WO1993019213A1 Process and plant for removing lead and zinc from metallurgical-works dust |
| 09/30/1993 | DE4209891A1 Verfahren zur Aufbereitung von Zink und Blei enthaltenden Hüttenwerksstaub Process for the preparation of zinc and lead-containing foundry dust |
| 09/21/1993 | US5246484 Injection of a reducing agent and oxygen to improve gasification |
| 09/01/1993 | EP0557312A1 Direct sulphidization fuming of zinc. |
| 08/17/1993 | US5236491 Contacting with selective anionic resin; maintaining pH between 4.0 and 5.5; elution with mineral acid; treating eluate |
| 08/03/1993 | US5232486 Heating the alloys in hermetic sealed furace at low pressure to vaporizing the zinc and condensing to solids |
| 07/29/1993 | DE4135368A1 Incinerator filter dust - is sieved to give a coarse fraction with low neutral salts and heavy metal cpd. content to reduce vol. for special disposal |
| 07/22/1993 | WO1993014030A1 Method for the recovery of zinc oxide |
| 07/21/1993 | EP0551992A1 Process for recovering valuable metals from an iron dust |
| 07/20/1993 | US5229003 Recovery of base materials from geothermal brines |
| 07/18/1993 | CA2086857A1 Process for recovering valuable metals from an iron dust |
| 07/14/1993 | EP0551155A1 Process for recovering zinc and lead from flue dusts from electrical steel works and for recycling said purified metals to the furnace, and installation for implementing said process |
| 06/10/1993 | WO1993011573A1 Method of processing used batteries |
| 06/09/1993 | CN1072998A Method of smoke-removal and dust-collection for coal-fired zinc-refining fusion furnace |
| 06/01/1993 | US5215572 Process and apparatus for absorption of zinc vapour in molten lead |
| 05/12/1993 | EP0486573A4 Absorption of zinc vapour in molten lead |
| 05/12/1993 | CN1071965A Process for smelting zinc from zinc bearing scale in blast-furnace gas washing waste water |
| 05/04/1993 | US5208004 Method for the recovery of zinc oxide |
| 05/04/1993 | CA1317088C Hydrometalurgical production of zinc oxide from roasted zinc concentrates |
| 04/29/1993 | WO1993008310A1 Extraction or recovery of metal values |
| 04/29/1993 | CA2119240A1 Extraction or recovery of metal values |
| 04/28/1993 | EP0538717A1 Method for the pyrometallurgical treatment of iron oxides and heavy metals contained in the fumes of electric arc furnaces |
| 04/28/1993 | CN1020382C Separation of zn-cd alloy by vacuum distillation |
| 04/27/1993 | US5205857 Placing object in enclosed atmosphere, heating and evacuating to evaporate and recover adhered substance |
| 04/22/1993 | CA2080879A1 Method for the pyrometallurgical treatment of iron oxides and heavy metals contained in the fumes of electric arc furnaces |
| 04/20/1993 | US5204084 Hydrometallurgical production of zinc oxide from roasted zinc concentrates |
| 04/07/1993 | CN1070691A Recovery of metal values from aqueous solutions |
| 03/30/1993 | US5198020 Adding calcium, iron and/or barium to phosphorous component and reducing zinc |
| 03/23/1993 | US5196047 Method of treatment of zinc-containing by-products and waste materials |
| 03/23/1993 | CA1314837C Method for manufacturing zinc hydrometallurgically |
| 03/10/1993 | EP0531209A1 Zinc-based alloys and their application to industrial processes |
| 03/09/1993 | US5192487 Oxidation, smelting |
| 03/09/1993 | US5192418 Metal recovery method and system for electroplating wastes |
| 02/23/1993 | US5188795 Battery recycling, reduced heat loss |
| 02/23/1993 | US5188658 Cracking the agglomerates of carbonaceous binder and zinc oxide dust furnace to form slag phase, liquid metal phase and gas phase by condensation |
| 01/26/1993 | CA1313023C Process for treating zinc oxide bearing materials |
| 01/15/1993 | EP0637992A4 Condensation of metal vapours in a fluidized bed. |
| 01/12/1993 | US5178667 Dry process for refining zinc sulfide concentrates |
| 01/06/1993 | CN1067598A Apparatus for manufacturing super-fine zinc dust with vacuum gas-phase process in reverberatory furnace |
| 12/30/1992 | EP0520524A1 Removal of zinc from phosphating sludges |
| 12/22/1992 | CA1311619C Use of citric acid partial esters for the extraction of iron |
| 11/26/1992 | DE4217081A1 Recovering plated metal from steel scrap - by vaporising organic material prior to vaporising plated metal |
| 11/19/1992 | EP0513966A2 Bis-bibenzimidazole composition |
| 11/18/1992 | CN1066297A Smelting of zinc by electric heating |
| 11/11/1992 | EP0511973A1 Metal recovery. |
| 11/10/1992 | US5162107 Method of reprocessing zinc- and lead-containing residues from metallurgical plants by means of a circulating fluidized bed system |
| 10/28/1992 | EP0510297A2 One step process for the treatment of Parkes desilvering crust to recover zinc and produce a suitable feed for cupellation |
| 10/20/1992 | CA1308918C Top submerged lancing reactor and direct smelting of zinc sulphide materials therein |
| 10/14/1992 | EP0508501A1 Method of reducing non-ferrous metal oxides in slags |
| 10/07/1992 | CN1065099A Process of reducing nonferrous metal oxides in slags |
| 10/06/1992 | CA1308262C Method and apparatus for reclaiming metal values from electric arc furnace flue dust and sludge and rendering residual solids recyclable or non-hazardous |
| 09/17/1992 | CA2062184A1 Process of reducing nonferrous metal oxides in slags |
| 09/15/1992 | CA1307395C Tank furnace for the metallurgical treatment of non-ferrous metals |
| 09/02/1992 | CA2062035A1 Bis-bibenzimidazole composition |
| 08/18/1992 | US5139567 Process for recovering valuable metals from a dust containing zinc |
| 07/21/1992 | US5131944 Method and apparatus for treating zinc concentrates |
| 07/16/1992 | DE4100911A1 Sepg. zinc from pyrolusite by washing with dil. mineral acid - also giving manganese di:oxide useful in pigment, oxidant and ferrite mfr. and e.g. zinc sulphate |
| 07/01/1992 | EP0493122A2 Method and apparatus for recovering substance adhered to object to be processed |
| 06/16/1992 | CA1303361C Method and apparatus for melting metals |
| 06/10/1992 | EP0489591A1 Method for treatment of zinc-containing by-products and waste materials |
| 06/09/1992 | US5120353 Hydrometallurgic method for processing raw materials containing zinc sulphide |
| 06/07/1992 | CA2055668A1 Method for treatment of zinc-containing by-products and waste materials |
| 05/29/1992 | WO1992008815A1 Direct sulphidization fuming of zinc |
| 05/29/1992 | CA2095436A1 Direct sulphidization fuming of zinc |
| 05/27/1992 | EP0486573A1 Absorption of zinc vapour in molten lead. |
| 05/20/1992 | CN1016680B Method for producing of high pure zinc oxide |
| 04/21/1992 | US5106467 Alkaline leaching of galvanized steel scrap |
| 04/16/1992 | WO1992006222A1 Method for extracting zinc present in liquid cast iron, and means for implementing such methods and products thus obtained |
| 04/08/1992 | EP0479326A1 Alkaline leaching of galvanized steel scrap |
| 03/24/1992 | CA1297681C Direct smelting process for sulfide ores |
| 03/18/1992 | EP0474956A1 Metallic vapor condenser capable of circulating a liquid metal |
| 02/26/1992 | CN1058926A Production method and device of zinc alloy powder made from rich zinc oxide ore |
| 02/19/1992 | CN1058809A Method of extracting zinc from zinc scruff |
| 01/21/1992 | US5082638 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 |
| 01/07/1992 | US5078899 Removal Of Ferric Hydroxide |
| 01/01/1992 | CN1057417A Process for manufacturing active zine powder by vacuum distillation and its equipment |
| 12/01/1991 | CA2043430A1 Process and removal of zinc and nickel from copper ammine sulfate solutions |
| 11/20/1991 | CN1014804B Process for treatment of ores or concentrates of lead sulfuride and/or lead-zinc sulfuride |
| 11/13/1991 | EP0456566A1 Plate for distillation column, distillation column containing such a plate and use of such a column |
| 11/13/1991 | EP0220198B1 Preparing metal compounds by pyrolysis |
| 10/23/1991 | EP0453151A1 Process for recovering valuable metals from a dust containing zinc |
| 10/17/1991 | WO1991009977A3 Metal recovery |
| 10/16/1991 | EP0451456A1 Hydrometallurgic method for processing raw materials containing zinc sulphide |
| 10/16/1991 | CN1055396A Vacuum distillation zinc extraction method of hot galvanizing residue |
| 09/04/1991 | CN1013770B Wet smelting zinc |
| 08/14/1991 | EP0441052A1 Method for recovering zinc from zinc-containing waste materials |
| 07/31/1991 | CN1013381B Extraction method of zinc from ores and concentrates |
| 07/10/1991 | CN1052834A Low-temp desulfurization method of lithopone |
| 07/09/1991 | US5030426 Biomining of gallium and germanium containing ores |
| 07/03/1991 | CN1013055B Apparatus for the pyrometallurgical processing of fine-grained solids to make molten products |
| 07/02/1991 | US5028410 Hydrometallurgical production of zinc oxide from roasted zinc concentrates |
| 07/02/1991 | US5028034 Veritical shaft retort with tapered cross-section; pyrometallurgy; pelletization |
| 06/26/1991 | EP0434120A1 Method for working up zinc- and lead-bearing steel plant residues |
| 06/26/1991 | EP0433674A1 Method for producing zinc by means of iron melt reduction |
| 06/23/1991 | WO1991009977A2 Metal recovery |
| 06/23/1991 | CA2072003A1 Metal recovery |
| 06/23/1991 | CA2032554A1 Method for recovering zinc from zinc-containing waste materials |
| 06/19/1991 | CA2031029A1 Method for producing zinc by means of iron melt reduction |
| 06/16/1991 | WO1991009146A1 Recovery of metal values from zinc plant residues |
| 06/16/1991 | CA2076025A1 Recovery of metal values from zinc plant residues |