| Patents for C22B 13 - Obtaining lead (1,881) |
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| 12/01/1992 | CA1310837C Hydrometallurgic process for recovering in the metal form the lead contained in the paste of the exhausted batteries |
| 11/12/1992 | WO1992019699A2 Process for purifying lead using calcium/sodium filter cake |
| 11/10/1992 | US5162107 Method of reprocessing zinc- and lead-containing residues from metallurgical plants by means of a circulating fluidized bed system |
| 10/27/1992 | US5158238 Process and apparatus for recovery of lead shot, bullets and slugs from firing ranges |
| 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 |
| 09/01/1992 | US5144108 Kiln for producing litharge by means of the calcination of massicot |
| 09/01/1992 | US5143693 Magnesium-calcium alloys for debismuthizing lead |
| 08/27/1992 | DE4105182A1 Reprocessing of lead-rich, sulphur-cong. slurries and flue dusts - by thermal process using reducing agent and slag-former, allowing recovery of molten lead and reduced glue gas sulphur emissions |
| 07/22/1992 | CN1062927A Method for concentrating high-content gold in raw lead |
| 06/30/1992 | US5125963 Metallurgical controlling method |
| 06/30/1992 | CA1304240C Magnesium-calcium alloys for debismuthizing lead |
| 06/23/1992 | CA1303862C Method for working-up waste products containing valuable metals |
| 06/23/1992 | CA1303861C Metallurgical controlling method |
| 06/09/1992 | US5120353 Hydrometallurgic method for processing raw materials containing zinc sulphide |
| 05/20/1992 | CN1016708B Processing method for sulfide containing lead material |
| 03/31/1992 | US5100466 Process for purifying lead using calcium/sodium filter cake |
| 03/24/1992 | CA1297681C Direct smelting process for sulfide ores |
| 03/18/1992 | EP0474956A1 Metallic vapor condenser capable of circulating a liquid metal |
| 02/20/1992 | WO1992002648A1 Method of extracting valuable metals from leach residues |
| 02/12/1992 | CN1015478B Metal lead prodn. directly from lead sulfide mineral |
| 02/11/1992 | US5087292 Recirculating molten metal in bath, ejecting near gas outlet |
| 12/04/1991 | CN1056772A Air furnace continuous melting for waste storage battery lead-contained material |
| 11/20/1991 | CN1014804B Process for treatment of ores or concentrates of lead sulfuride and/or lead-zinc sulfuride |
| 11/13/1991 | EP0456528A1 Process for refining lead, especially for removing copper |
| 10/16/1991 | EP0451456A1 Hydrometallurgic method for processing raw materials containing zinc sulphide |
| 10/01/1991 | US5053076 Process and device for removal of arsenic, tin & artimony from crude lead containing silver |
| 08/20/1991 | US5041160 Magnesium-calcium alloys for debismuthizing lead |
| 07/31/1991 | EP0438622A1 Method and apparatus for removing arsenic, tin and antimony from crude lead. |
| 07/10/1991 | CN1052903A Conversion treatment of lead-base gold or lead ores with soda |
| 07/03/1991 | EP0434831A1 Method for the recovery of zinc, copper and lead of oxidized and/or sulfurized ores and materials |
| 07/03/1991 | CN1013055B Apparatus for the pyrometallurgical processing of fine-grained solids to make molten products |
| 06/26/1991 | EP0434120A1 Method for working up zinc- and lead-bearing steel plant residues |
| 06/20/1991 | DE4006651C1 Treating used lead batteries - by breaking into pieces, placing on inclined conveyor, collecting sulphuric acid in vessel and neutralising |
| 06/19/1991 | CN1052334A Hot air smelting method for lead blast furnace and its wind jacket in furnace |
| 05/15/1991 | EP0287662B1 Shoe and fitting for shoe freely adaptable to foot |
| 04/16/1991 | CA1282966C Method for slag fuming and reduction |
| 04/16/1991 | CA1282965C Zinc recovery from furnace dust |
| 03/20/1991 | CN2073325U Centrifugal filter machine for softening stannum |
| 03/12/1991 | CA2024885A1 Method and apparatus to enrich furnace gases with sulfur oxide |
| 02/20/1991 | CN1049380A Process for removing thallium from lead bullion |
| 02/20/1991 | CN1049379A Long-life measure of an active ebv st 45.8/iii furnace steel pipe of gfr |
| 02/06/1991 | EP0412048A1 Process for recovering pure lead and waterproofing ecological slags from worn-out batteries |
| 01/30/1991 | CN1048890A Apparatus for extracting metallic lead from lead sulfide concentrate |
| 01/22/1991 | CA1279198C Zinc smelting process using oxidation zone and reduction zone |
| 01/19/1991 | CA2019329A1 Process for recovering pure lead and waterproofing ecological slags from worn-out batteries |
| 01/14/1991 | WO1991000931A1 Method for the recovery of zinc, copper and lead of oxidized and/or sulfurized ores and materials |
| 01/14/1991 | CA2036379A1 Method for the recovery of zinc, copper and lead of oxidized and/or sulfurized ores and materials |
| 01/10/1991 | DE3920522A1 Plant for extracting metallic lead from sulphidic concentrate - has divided chamber with ratio of electrothermic section area to that of vessel, to increase extraction and reduce energy use |
| 01/09/1991 | EP0406954A1 Kiln in particular for producing litharge by means of the calcination of massicot |
| 01/09/1991 | EP0406929A1 Process for removing thallium from lead |
| 01/06/1991 | CA2020412A1 Process of removing thallium from lead bullion |
| 01/06/1991 | CA2020294A1 Kiln in particular for producing litharge by means of the calcination of massicot |
| 12/18/1990 | CA1277840C Method for continuous reduction of molten metallurgical slag in an electric furnace |
| 12/05/1990 | CN1010697B Lead-antimony raw alloy centrifugal segregation |
| 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 |
| 10/30/1990 | US4966624 Method and apparatus for electric refining of lead |
| 10/17/1990 | EP0392900A1 Process and apparatus for the treatment of a liquid with a gas |
| 10/16/1990 | CA1275174C Secondary lead production |
| 10/10/1990 | CN1045995A Metal lead prodn. directly from lead sulfide mineral |
| 08/28/1990 | USRE33313 Method for making low alpha count lead |
| 07/31/1990 | CA1272020A1 Apparatus for the pyrometallurgical processing of fine-grained solids to make molten products |
| 07/04/1990 | CN1043530A Technology for directly producing metals from zinc lead antimony sulphate mine |
| 04/10/1990 | US4915802 Selecting low emitter ore, milling, forming suspension, separating, reducing:electrolytically |
| 03/27/1990 | US4911755 Method for the refining of lead |
| 03/21/1990 | CN1007269B Removal thallium method of raw lead and refined lead |
| 03/20/1990 | US4909839 Recovering from scrap containing lead oxide or sulfate and antimony compound; adding reducing agent; melting; forming slag |
| 02/06/1990 | US4897938 Shoe freely fitting to a foot and a foot bed |
| 01/23/1990 | US4895595 Oxidation and reduction zones |
| 12/19/1989 | US4887492 Forming suspension, separation by gravity; reduction with sodium carbonate |
| 11/23/1989 | EP0343012A2 Magnesium-calcium alloys for debismuthizing lead |
| 11/21/1989 | US4881971 Adding an electrolytic product of barium alloy to a lead melt, cooling and removing the slag |
| 11/07/1989 | US4878654 Method for cooling gases and/or vapors from non-ferrous metal treatment plants, and the relative apparatus |
| 10/03/1989 | US4871147 Apparatus for the pyrometallurgical processing of fine-grained solids |
| 09/19/1989 | CA1259494A1 Lead purification process |
| 09/13/1989 | CN1035529A Processing method for sulfide containing lead material |
| 08/24/1989 | DE3804809C1 Method for processing lead-containing sulphide materials |
| 08/23/1989 | EP0328613A1 Metallurgical controlling method |
| 08/23/1989 | EP0214268B1 A method for working-up waste products containing valuable metals |
| 06/28/1989 | CN1004635B Wet process for extracting metallic compound from multi-metal refractory paragenetic ore |
| 05/23/1989 | US4832925 Leaching, oxidation, precipitation of impurities |
| 04/11/1989 | US4820340 Reduction to form metal vapors, oxidation of vapors, recovery of zinc, lead |
| 04/05/1989 | EP0310269A1 Method for making low alpha count lead |
| 03/08/1989 | CN1031568A Lead-antimony raw alloy centrifugal segregation |
| 02/23/1989 | WO1989001530A1 Metallurgical controlling method |
| 02/15/1989 | CN1003310B New technique of fire refining method for bullion lead |
| 02/07/1989 | US4802919 Heating in reducing slag with carbonaceous material |
| 02/07/1989 | CA1249885A1 Membrane processes for metal recovery and pollution control in metal process industries |
| 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 |
| 10/27/1988 | DE3811594A1 Method for processing lead-containing or lead- and zinc-containing sulphide ores and/or concentrates |
| 10/26/1988 | EP0287662A1 Shoe and fitting for shoe freely adaptable to foot |
| 10/26/1988 | CN87209402U Internal-heating multiple-stage continuously-distilling vacuum furnace |
| 10/11/1988 | US4777028 Process for freeing mineral acids from heavy metals |