| Patents for C22B 19 - Obtaining zinc or zinc oxide (2,969) |
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| 12/13/1995 | EP0686703A1 Method of making pig iron with zinc recovery |
| 12/12/1995 | US5474592 Method of reprocessing metallurgical residues, which contain zinc and lead |
| 11/29/1995 | CN1030400C Process of reducing nonferrous metal oxides in slags |
| 11/16/1995 | WO1995030626A1 Recovery of chemical values from industrial wastes |
| 11/16/1995 | CA2188658A1 Recovery of chemical values from industrial wastes |
| 11/07/1995 | US5464596 Method for treating waste streams containing zinc |
| 10/18/1995 | EP0677118A1 Hydrometallurgical recovery of metals from complex ores. |
| 10/17/1995 | US5458990 Method of processing used batteries |
| 10/11/1995 | EP0486573B1 Absorption of zinc vapour in molten lead |
| 09/26/1995 | US5453253 Reacting with concentrate of zinc sulfide in dilute sulfuric acid; suspending, flashing, separation, leaching, and electrolysis |
| 09/26/1995 | US5453111 Method for separation of metals from waste stream |
| 09/19/1995 | US5451382 Process and plant for removing lead, cadmium and zinc from dusts |
| 09/06/1995 | CN1107895A Technology and equipment for coproducing zinc sulfate and lead concentrate |
| 08/23/1995 | CN1107184A Method for recovering zinc from zinc containing dust background of the invention |
| 08/22/1995 | US5443614 Direct smelting or zinc concentrates and residues |
| 08/17/1995 | WO1995021945A1 A method of removing halogens from a zinc containing material |
| 08/15/1995 | US5441712 Contacting a brine with a water-insoluble anionic or cationic organic solvent selective for the extraction of zinc, stripping solvent with a solution of nitric acid to form zinc nitrate that is thermally hydrolyzied to zinc oxide |
| 08/02/1995 | CN1106130A Method and furnace construction to be used in processes for producing easily volatile metals |
| 07/11/1995 | US5431788 Chloride assisted hydrometallurgical copper extraction |
| 06/21/1995 | EP0658215A1 Extraction or recovery of metal values |
| 06/14/1995 | EP0657552A1 Method for recovering zinc from zinc containing dust |
| 06/08/1995 | WO1995015329A1 Amides of acids of phosphorus for the extraction of metals |
| 06/08/1995 | CA2177064A1 Amides of acids of phosphorus for the extraction of metals |
| 05/24/1995 | EP0654538A1 Method for working up zinc-, lead- and iron oxide-bearing material by the rotary-kiln volatilising process |
| 05/10/1995 | EP0652294A1 Method and furnace construction to be used in processes for producing easily volatile metals |
| 05/03/1995 | EP0650384A1 Treatment of polyvinylchloride. |
| 05/02/1995 | US5411572 Method for utilizing smelter waste containing zinc and other valuable metals |
| 04/15/1995 | CA2117958A1 Method and furnace construction to be used in processes for producing easily volatile metals |
| 04/05/1995 | EP0646185A1 Production of metals from minerals |
| 04/04/1995 | US5403380 Method for producing easily volatile metals, such as zinc, lead, mercury and cadmium, of sulfidic raw materials |
| 04/04/1995 | CA1335041C Process of dezincifying a material flow when operating a pig-iron production plant |
| 03/08/1995 | EP0641394A1 Oxygen smelting. |
| 03/02/1995 | WO1995006140A1 Method for removing zinc from sulphured concentrates |
| 02/28/1995 | US5393431 Solvent extraction using a aminobis(thiophosphoryl) compound |
| 02/15/1995 | EP0637992A1 Condensation of metal vapours in a fluidized bed. |
| 02/07/1995 | US5387275 Process for extracting zinc present in liquid cast iron, means for the implementation of the process, and products thus obtained |
| 01/11/1995 | EP0632843A1 Process and plant for removing lead and zinc from metallurgical-works dust. |
| 01/10/1995 | US5380354 Recovery of metals from sulphidic material |
| 12/14/1994 | EP0553216B1 Method for extracting zinc present in liquid cast iron, and means for implementing such method |
| 12/13/1994 | US5372630 Contacting a mixture of slag and molten matte containing zinc sulfide and iron sulfide with an oxygen-containing carrier gas |
| 12/08/1994 | WO1994028184A1 An integrated bioleach/solvent extraction process for zinc metal production from zinc concentrates |
| 11/30/1994 | EP0626457A1 Method for working up zinc- and lead-bearing steel plant residues |
| 11/28/1994 | CA2123378A1 Method of reprocessing residual metallurgical materials which contain zinc and lead |
| 11/10/1994 | WO1994025632A1 Recovery of metals from sulphidic material |
| 11/02/1994 | EP0658215A4 Extraction or recovery of metal values. |
| 11/02/1994 | CN1026419C Technology for refining zinc by electric heating method |
| 10/25/1994 | US5358700 Method of extracting zinc from brines |
| 10/25/1994 | US5358548 Condensation of metal vapors in a fluidized bed and apparatus |
| 10/25/1994 | US5358544 Circulating molten zinc and copper sulfate; oxidation |
| 10/18/1994 | US5355814 Gasifier burner for powdered solid fuels and method for using the same |
| 09/29/1994 | WO1994021832A1 Method of recovering zinc |
| 09/29/1994 | WO1994021830A1 Recovery of zinc, iron, lead and silver values from zinc sulphide concentrate by a multi-stage pressure oxidation process |
| 09/27/1994 | US5350438 Method and apparatus for removing plated metal from steel sheet scraps |
| 09/27/1994 | CA2058508C Method and apparatus for recovering substance adhered to object to be processed |
| 09/20/1994 | US5348713 Leaching with aqueous sulfuric acid, treating leach slurry with zinc concentrate under oxidizing and then reducing conditions, zinc flotation, reducing leach, copper flotation, liquid-solid separation, lead flotation, recovery of zinc |
| 09/19/1994 | CA2096050A1 Method of recovering zinc |
| 09/07/1994 | EP0613587A1 Method of processing used batteries. |
| 08/24/1994 | CN1091157A Production of metal from minerals |
| 08/04/1994 | WO1994017216A1 Hydrometallurgical recovery of metals from complex ores |
| 08/03/1994 | EP0608874A1 Method for dissolving sludge and recovering constituents therefrom |
| 08/03/1994 | EP0608695A1 Method for utilizing smelter waste containing zinc and other valuable metals |
| 07/30/1994 | CA2114297A1 Method for dissolving sludge and recovering constituents therefrom |
| 07/26/1994 | US5332560 Process for the removal of zinc and nickel from copper ammine sulfate solutions |
| 07/06/1994 | CN2170800Y 离心反应器 Centrifugal reactor |
| 07/06/1994 | CN1088991A Process for control of Mn and Zn contamination from hydrometallurgy of Mn and Zn by pressurization or depressurization |
| 06/28/1994 | US5324343 Galvanized steel sheet; remelting to eliminate Zn coating; heating action of a fuel and oxidizing agent |
| 06/21/1994 | US5322642 Method of manufacturing semiconductors from homogeneous metal oxide powder |
| 04/14/1994 | WO1994008058A1 Method for hydrometallurgical processing of zincky byproducts |
| 04/14/1994 | WO1994008057A1 Method for the enhanced recovery of zinc oxide |
| 04/12/1994 | CA1328353C Recovery of zinc from zinc bearing sulphidic ores and concentrates by controlled oxidation roasting |
| 04/07/1994 | DE4301042C1 Treatment the sludge obtained from zinc leachant - to recover zinc, iron and manganese |
| 03/30/1994 | CN1084488A Process and plant for removing lead, cadmium and zinc from dusts |
| 03/17/1994 | WO1994005818A1 Process and system for recovering zinc and other metal vapors from a gaseous stream |
| 03/16/1994 | EP0586910A1 Process and installation for removing lead, cadmium and zinc from dusts |
| 03/16/1994 | EP0410996B1 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 |
| 03/02/1994 | CN1023904C Smelting process |
| 02/23/1994 | CN1023870C Method of extracting zinc from zinc scruff |
| 02/16/1994 | CN1023818C Vacuum distillation zinc extraction method of hot galvanizing residue |
| 02/03/1994 | WO1994002210A1 Treatment of polyvinylchloride |
| 02/02/1994 | EP0580912A1 Process for making metal alloys for obtaining a homogenous powder of oxides of said metals and their applications for obtaining semi-conductors and super-conductors |
| 01/26/1994 | CN1023611C Blast furnace gas wash waste water zinciferous water scale zinc-smelting method |
| 01/20/1994 | DE4223300A1 Finely-divided zinc oxide prodn. from zinc salt, esp. sulphate soln. - by adding soln. to part of soda soln. and adding rest of soda soln. to ppte. basic carbonate without co-pptn. of magnesium |
| 01/18/1994 | US5279643 Agglomeration with aluminum refining sludge; reduction, separation |
| 01/06/1994 | WO1994000606A1 Production of metals from minerals |
| 01/05/1994 | CN1080325A Method for producing easily volatile metals, such as zinc, lead and cadmium, of sulphidic raw materials |
| 12/15/1993 | EP0574035A1 Continuous feed shaft retort process and apparatus for recovery of non-ferrous metals |
| 12/15/1993 | CN2149403Y Rotation type crucible furnace for smelting zinc using coal as fuel |
| 12/09/1993 | WO1993024666A1 Oxygen smelting |
| 12/09/1993 | CA2136425A1 Oxygen smelting |
| 12/08/1993 | EP0573182A1 Process for extracting metal values |
| 12/07/1993 | CA1325068C Depressant for flotation separation of polymetallic sulphidic ores |
| 12/07/1993 | CA1324977C Process of treating residues from the hydrometallurgical production of zinc |
| 12/06/1993 | CA2097158A1 Chemical process |
| 11/24/1993 | EP0570942A1 Method for producing easily volatile metals, such as zinc, lead and cadmium, of sulfidic raw materials |
| 11/23/1993 | US5264083 Distillation column tray |
| 11/02/1993 | US5258524 Bis-bibenzimidazole composition |
| 11/02/1993 | US5258055 Condensation of metals such as zinc |
| 10/28/1993 | WO1993020898A1 High temperature process and plant for treatment and resources recovery of hazardous waste |
| 10/20/1993 | EP0566451A1 Process and installation for reclaiming metals from metallic scrap material |
| 10/05/1993 | US5250273 Recovering gold, uranium, copper, zinc, mickel and lead from ores, calcines |