| Patents for C22B 7 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof (11,341) |
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| 03/29/1991 | CA2020757A1 Recycling metal containing compositions |
| 03/21/1991 | WO1991003577A1 Dry cold process for making foundry dusts into briquettes |
| 03/19/1991 | CA1281553C Electrothermal preparation and refining process of metals derived from scrap,and related installation |
| 03/19/1991 | CA1281552C Further improvements in tungsten recovery |
| 03/13/1991 | EP0416415A1 Process for upgrading of antimony halide catalyst solutions |
| 03/13/1991 | CN1011949B Method of treating cemented carbide bodies regarding their compositions and structures |
| 03/01/1991 | CA2065314A1 Dry cold process for making foundry dusts into briquettes |
| 02/26/1991 | US4995984 Supported heteropolycyclic compounds in the separation and removal of late transition metals |
| 02/25/1991 | WO1991002824A1 Smelting of metallurgical waste materials containing iron compounds and toxic elements |
| 02/20/1991 | EP0413275A1 Method for treatment of storage batteries |
| 02/19/1991 | US4993689 Convertor for continuously melting scrap with tapping means |
| 02/13/1991 | EP0412935A1 Method of recycling non-sorted mixtures of used button cells and other metallic objects and further recuperating their metallic components |
| 02/12/1991 | CA1279995C Recovery of metals from their alloys with lead |
| 02/12/1991 | CA1279994C Tungsten recovery |
| 02/10/1991 | WO1991002095A1 Arrangement for introducing waste material into a molten slag |
| 02/10/1991 | CA2037905A1 Arrangement for introducing waste material into a molten slag |
| 02/09/1991 | CA2022763A1 Process for recycling an unsorted mixture of spent button cells and/or other metallic objects and for recovering their metallic components |
| 01/24/1991 | DE3923552A1 Processing scale formed in rolling mills - by mixing with burnt lime and supplying to iron and steel prodn. plant |
| 01/23/1991 | EP0305418B1 Process for recovering platinum group metals |
| 01/22/1991 | US4986197 Apparatus for using hazardous waste to form non hazardous aggregate |
| 01/22/1991 | CA1279196C Process for purifying silver refinery slimes |
| 01/16/1991 | CN2069416U Recovery processing machine of waste toothpaste wrapper |
| 01/16/1991 | CN1048566A Disposal method of tailings water contained cn for a chlorinated gold extracting shop |
| 01/08/1991 | US4983216 Removal of salt and skim layers |
| 12/27/1990 | EP0404685A1 Process and apparatus for separating the constituents of an alloy |
| 12/27/1990 | EP0403695A1 Process and plant for recycling scrap appliances |
| 12/19/1990 | CN1047888A Wet method for treating lead anode slurry |
| 12/18/1990 | CA1277840C Method for continuous reduction of molten metallurgical slag in an electric furnace |
| 12/12/1990 | CN1047702A Technology of processing chromium slag by vacuum reducing for obtaining variable kinds of products |
| 12/05/1990 | EP0400925A2 Process and apparatus for melting contaminated metalliferous scrap material |
| 12/04/1990 | US4975115 Process for treating dust and fume produced by the basic oxygen steelmaking process |
| 11/29/1990 | EP0363429A4 Process for chemical stabilization of heavy metal bearing dusts and sludges, such as eaf dust. |
| 11/15/1990 | WO1990013678A1 Process and apparatus for the recovery of precious metals from slag, tailings and other materials |
| 11/15/1990 | WO1990013675A1 Process for two-phase extraction of metallic ions from phases containing solid metallic oxides, agent and use |
| 10/30/1990 | US4966761 Process for treatment of flyash |
| 10/27/1990 | WO1990012898A1 A method of recovering silver from photographic processing solutions |
| 10/23/1990 | US4964920 Aqueous solution of nitric acid, ferric nitrate and anthra-nilic acid |
| 10/18/1990 | WO1990012121A1 Method of extracting iron from a pulp containing compounds of heavy non-ferrous metals |
| 10/18/1990 | WO1990012120A1 Method of extracting iron from a pulp containing compounds of heavy non-ferrous metals |
| 10/16/1990 | US4963182 Continuous feed shaft retort process for recovery of non-ferrous metals from process dust |
| 10/16/1990 | CA1275174C Secondary lead production |
| 10/11/1990 | DE3911490C1 Apparatus for recovering copper during the scrapping of electric motors |
| 10/04/1990 | WO1990011380A1 Treatment of aluminum reduction cell linings combined with use in aluminum scrap reclamation |
| 10/04/1990 | DE3930852C1 Disposal of filter dusts from foundry processes - by injecting into slag ladle using blowing lances |
| 10/03/1990 | EP0390293A1 A process of treating metal chloride wastes |
| 10/03/1990 | CN1009838B Magnetic separation and concentration of valuable metals from slag of lead smelting furnace and their smelting processes |
| 10/02/1990 | US4960573 Recovering method of catalytic component and carrier from waste catalyst |
| 10/02/1990 | US4960460 Melting, removing molten metal from residue; insolubilizing fluorides in slag with exides |
| 09/26/1990 | CN1045606A Products and process obtaining silicon-aluminium alloy from waste slog powder |
| 09/25/1990 | US4959100 Recovering aluminum |
| 09/19/1990 | EP0387479A1 Continuous feed shaft retort process and apparatus for recovery on non-ferrous metals |
| 09/18/1990 | US4957551 Method for treatment of dust recovered from off gases in metallurgical processes |
| 09/11/1990 | US4956159 Process for recovering gallium trichloride from gallium-containing waste |
| 09/05/1990 | EP0385968A2 Process for separating and recovering dissolved and precipitable metals, in particular heavy metals, from aqueous solutions |
| 09/05/1990 | CN1009464B Combined smoke furnace |
| 08/28/1990 | US4952237 Method and apparatus for recovery of non-ferrous metals from dross |
| 08/15/1990 | CA2010096A1 Process for removing impurities from flue dusts |
| 08/08/1990 | CN1044501A Method and apparatus for mfg. high-grade nickel matte |
| 08/07/1990 | CA1272464A1 Method of recovering gallium from scrap containing gallium |
| 08/01/1990 | EP0380467A2 Process for the combined decomposition of organic compounds and the removal of Hg, Pb and Cr from flue dusts of thermal discarding processes |
| 07/25/1990 | EP0379245A1 Process and plant for the processing of slag from aluminium scrap and waste melting, recovery of components thereof and treatment of gasses generated |
| 07/25/1990 | EP0221187B1 Method of dissolving and recovering noble metals |
| 07/25/1990 | CN1044129A Catalysising. crystallizing and growing of columbite from a kind of slag |
| 07/18/1990 | CA2007877A1 Process and plant for the processing of slag from aluminium scrap and waste melting, recovery of components thereof and treatment of gasses generated |
| 07/11/1990 | CN1008693B Catalyst recovery process |
| 07/10/1990 | US4940487 Process for utilizing of zinc-containing metallurgical dusts and sludges |
| 07/03/1990 | US4938866 Conveyor residue removal apparatus |
| 06/27/1990 | CN1043346A Method for reclaiming w and co from waste materials and products thereof |
| 06/12/1990 | US4933153 Method of preparing a synthetic rutile from a titaniferous slag containing magnesium values |
| 06/07/1990 | DE3844214C1 Process for the recovery of rare metals from catalysts |
| 05/23/1990 | CN1042383A Method for extracting gallium from ga contg. slag |
| 05/22/1990 | US4927794 Aqueous, ammonia, ammonium salt, hydrogen peroxide |
| 05/22/1990 | US4927459 Treatment of aluminum reduction cell linings combined with use in aluminum scrap reclamation |
| 05/22/1990 | CA1269355A1 System for recovery of salvageable ferrous and non- ferrous metal components from incinerated waste materials |
| 05/08/1990 | CA1268730A1 Purification of gases containing mercury and recovery of metallic mercury |
| 05/02/1990 | EP0366334A1 Improvements in or relating to the recovery of silver |
| 04/26/1990 | CA2001413A1 Uranium absorbent |
| 04/19/1990 | DE3834888A1 Process for metal recovery from steelworks filter dust and similar material |
| 04/18/1990 | EP0363429A1 Process for chemical stabilization of heavy metal bearing dusts and sludges, such as eaf dust. |
| 04/17/1990 | US4917725 Mixing with reducing agent, melting point reducing material, a adding to molten steelmaking slag, bubbling oxygen through, recovering volatiles,,cooling melt |
| 04/17/1990 | US4917723 Method for agglomeration of iron bearing materials |
| 04/17/1990 | CA1267783A1 Dross cooling |
| 04/11/1990 | EP0363314A1 Process and device for recovering catalyst constituents |
| 04/10/1990 | US4915730 Metals, such as silver |
| 04/04/1990 | EP0362125A1 Process for the treatment of solid incinerator plant residues containing a heavy metal |
| 04/04/1990 | EP0361773A1 Method of recovering radioactive iodine in a spent nuclear fuel retreatment process |
| 04/03/1990 | US4913885 Aqueous suspension of spent vanadium pentaoxide catalyst contacted with oxygen and sulfur dioxide |
| 04/03/1990 | US4913736 Process for recovering platinum group metals |
| 04/03/1990 | CA1267289A1 Process for the separation of metals from aqueous media |
| 03/28/1990 | EP0359931A1 Process and apparatus for separating vaporous heavy metal compounds from a carrier gas |
| 03/27/1990 | US4911757 Calcium aluminum silicate |
| 03/22/1990 | DE3831838A1 Process for the utilisation of steel works filter dust and similar material |
| 03/20/1990 | US4909839 Recovering from scrap containing lead oxide or sulfate and antimony compound; adding reducing agent; melting; forming slag |
| 03/15/1990 | DE3830366A1 Method for separating wire lengths from a fraction of scrap particles |
| 03/13/1990 | US4907784 Apparatus for successively fusing small particles of nonferrous metal |
| 03/07/1990 | EP0267197B1 Melting and holding furnace |
| 02/21/1990 | CN1006904B Fluxing agent for regeneration of metal from waste aluminium slag |
| 02/14/1990 | EP0354613A1 Process for cleaning exhaust gases from a sintering installation |
| 02/07/1990 | EP0353541A2 A method of recycling steel belted tires |
| 01/30/1990 | US4896810 Apparatus for melting scrap |