| 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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| 01/28/1992 | CA1294788C Method of treating cemented carbide bodies regarding their compositions and structures |
| 01/22/1992 | EP0467874A1 Method for reprocessing steel mill dust and installation using this method |
| 01/22/1992 | EP0467180A2 Rare earth/transition metal alloy scrap treatment method |
| 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 |
| 01/21/1992 | US5082493 Processing of carbon steel furnace dusts |
| 01/18/1992 | CA2047162A1 Rare earth/transition metal alloy scrap treatment method |
| 01/15/1992 | EP0466223A1 Process for treating fine particles coming from electrofilters used in mineral oil-cooled power transformer installations |
| 01/15/1992 | CN1057865A Method of extracting silver and gold from the anode argillaceous nitric acidic residue of tin soldering |
| 01/07/1992 | WO1992001074A1 Reclamation of metal from scrap |
| 01/07/1992 | US5078786 Process for recovering metal values from jarosite solids |
| 01/07/1992 | CA2086253A1 Reclamation of metal from scrap |
| 01/02/1992 | EP0463442A1 Process and device for preparing wastes from machining by removal of ferromagnetic materials |
| 12/18/1991 | EP0397662B1 Process for treating colloidal solutions of lacquer sludges |
| 12/10/1991 | US5071476 Recovery silver from photo sensitive materials |
| 12/04/1991 | CN1056772A Air furnace continuous melting for waste storage battery lead-contained material |
| 11/26/1991 | US5067659 Method of treating refuse scrap |
| 11/25/1991 | CA2017577A1 Handling and disposal of toxic chromium dust |
| 11/21/1991 | DE4015489A1 Freeing waste material from heavy metals and dioxin(s) - by treating aq. slurry with active gas mixt. and precipitating heavy metals |
| 11/20/1991 | CN1056347A Apparatus for using hazardous waste to form non hazardous aggregate |
| 11/20/1991 | CN1014804B Process for treatment of ores or concentrates of lead sulfuride and/or lead-zinc sulfuride |
| 11/19/1991 | US5066469 Leaching cobalt from metal-containing particles |
| 11/14/1991 | WO1991016846A1 Apparatus for using hazardous waste to form non-hazardous aggregate |
| 11/14/1991 | DE4114494A1 Auto catalytic conversion of liq. wastes contg. metals - useful for decontamination of wastes from electrolytic processes ion exchange regeneration etc. avoiding electrodeposition |
| 11/13/1991 | EP0455873A2 Apparatus for using hazardous waste to form non hazardous aggregate |
| 11/12/1991 | US5064466 Non-toxic process for recovery of photographic silver |
| 10/30/1991 | EP0453904A1 Method for disposing of run-down batteries and other waste products made toxic by the presence of heavy metals therein |
| 10/30/1991 | CN1055768A Fluidized-bed roasting treatment method for aluminium electrolytic flue ash |
| 10/30/1991 | CN1055766A Process for making zine oxide from zinc bearing flue ash |
| 10/29/1991 | US5060871 Crushing, magnetically separating on sloping table larger from smaller; aerospace wastes; aluminum-lithium alloy from other wrought aluminum alloys |
| 10/28/1991 | CA2041307A1 Method for disposing of run-down batteries and other waste products made toxic by the presence of heavy metals therein |
| 10/23/1991 | EP0453151A1 Process for recovering valuable metals from a dust containing zinc |
| 10/17/1991 | WO1991015607A1 Rotary melting furnace |
| 10/17/1991 | WO1991009977A3 Metal recovery |
| 10/16/1991 | EP0451323A2 Method for preheating scrap iron by pyrolysis of resinous residues contained therein, with total recovery of their energy content and improvement of the steelmaking cycle |
| 10/15/1991 | CA1290575C Leaching cobalt, molybdenum, nickel, and vanadium from spent hydroprocessing catalysts |
| 10/10/1991 | CA2023414A1 Method of and apparatus for preheating and removing organic materials from scrap iron |
| 10/02/1991 | EP0448724A1 Melting apparatus of cutting scrap |
| 10/02/1991 | DE4009671A1 Disposing of waste contg. heavy metals, esp. sewage sludge etc. - by high temp. combustion in admixture with quinoline giving prod. used as substitute for heavy metal ore |
| 09/17/1991 | CA1288952C Metal recovery process |
| 09/10/1991 | CA1288577C Method of preparing a synthetic rutile from a titaniferous slag containing magnesium values |
| 09/04/1991 | CN1054270A Recovery and processing method of waste hard alloy material |
| 09/03/1991 | US5045160 Demetallization of wastes |
| 09/03/1991 | US5045115 Method for treating solid residues containing heavy metals from combustion plants |
| 09/02/1991 | WO1991013179A1 Process for recovering valuable metals from spent catalysts |
| 08/22/1991 | WO1991012210A1 Cotreatment of sewage and steelworks wastes |
| 08/21/1991 | EP0442451A2 Aluminium scrap melting |
| 08/21/1991 | EP0232380B1 Process for purifying silver refinery slimes |
| 08/14/1991 | EP0441210A1 Apparatus with improved flow-through characteristics for the recovery of silver from silver-containing waste fluids |
| 08/14/1991 | EP0441052A1 Method for recovering zinc from zinc-containing waste materials |
| 08/13/1991 | CA2036076A1 Aluminum scrap melting |
| 08/08/1991 | WO1991009145A3 Method for recovering metals from waste liquors |
| 07/30/1991 | US5035402 Furnaces |
| 07/30/1991 | CA2034791A1 Apparatus with improved flow-through characteristics for the recovery of silver from silver-containing waste fluids |
| 07/23/1991 | CA1286478C Magnesium fluoride recovery method |
| 07/17/1991 | CN1053093A Prodn. of high-chromium, low-phosphorus, and low carbon chromium-iron |
| 07/17/1991 | CN1053092A Treatment and use of waste residue and waste liq. from cd-ni cell |
| 07/16/1991 | US5032175 Process for removing impurities from flue dusts |
| 07/11/1991 | WO1991009978A1 Process for converting dross residues to useful products |
| 07/09/1991 | US5030274 Method for recovering metallics and non-metallics from spent catalysts |
| 07/09/1991 | US5030273 Furnace-plasma arc torch-supervisory control system for recovery of free aluminum from aluminum dross |
| 07/02/1991 | US5028034 Veritical shaft retort with tapered cross-section; pyrometallurgy; pelletization |
| 06/27/1991 | WO1991009145A2 Method for recovering metals from waste liquors |
| 06/26/1991 | EP0434120A1 Method for working up zinc- and lead-bearing steel plant residues |
| 06/25/1991 | US5026240 Charging device |
| 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 | CN1012909B Process for recovering lead from exhuasted accumulator |
| 06/16/1991 | WO1991009146A1 Recovery of metal values from zinc plant residues |
| 06/16/1991 | CA2076025A1 Recovery of metal values from zinc plant residues |
| 05/30/1991 | WO1991007372A1 Process for the recovery of catalyst values |
| 05/30/1991 | WO1991005881A3 A method for removing chromium from chromium containing waste material |
| 05/29/1991 | EP0429044A1 Process for recovering metals from aqueous solutions |
| 05/28/1991 | US5019360 Magnetic separation, extraction, precipitation |
| 05/28/1991 | US5019237 Metal-ion vapor accelerator cell |
| 05/22/1991 | EP0428194A1 Process for treating Jarosite containing residues |
| 05/22/1991 | CN1012647B Method for recovering valuable metal content of contaminated copper raw material |
| 05/22/1991 | CN1012646B Catalysising crystallizing and growing method of columbite from kind of slag |
| 05/15/1991 | EP0427710A1 Smelting reduction |
| 05/15/1991 | EP0427341A1 Method for selectively separating a non-ferrous metal |
| 05/08/1991 | EP0426054A1 Method of removing sulphur dioxide and if applicable nitrogen oxides and other impurities from the exhaust gas of waste incineration |
| 05/08/1991 | DE4035049A1 Nitrifying fly ash from incinerators - by heating to melt and break down harmful products followed by quenching |
| 05/07/1991 | US5013533 Process for recovering valuable metals from spent catalysts |
| 05/07/1991 | US5013532 Method for recycling electric arc furnace dust |
| 05/07/1991 | US5013356 Process for the processing of slag from aluminium scrap and waste melting, recovery of components thereof and treatment of gasses generated |
| 05/02/1991 | WO1991005881A2 A method for removing chromium from chromium containing waste material |
| 05/02/1991 | EP0424400A1 Anti-theft measures |
| 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 | US5008017 Mixing silver containing sludge with metal bicarbonate and carbonates to form free-flowing powder |
| 04/16/1991 | US5007960 Drying, sizing, mixing with alkali, heating in the presence of oxygen, extracting water soluble chromate, evaporating |
| 04/16/1991 | CA1282966C Method for slag fuming and reduction |
| 04/16/1991 | CA1282965C Zinc recovery from furnace dust |
| 04/15/1991 | WO1991005883A1 Melting apparatus of cutting scrap |
| 04/10/1991 | EP0421978A1 Process for the thermal pretreatment of scrap |
| 04/09/1991 | US5006166 Recovery of noble metals |
| 04/03/1991 | EP0420525A2 Recycling metal containing compositions |
| 04/03/1991 | CN1050410A Dry process for cold briquetting of metallurgical dust |
| 04/02/1991 | US5004496 Smelting with reducing agent and flux in gastight electrothermic furnace, tapping to remove slag and metal, oxidizing gas in afterburner, cooling |
| 04/02/1991 | US5004212 Apparatus with improved flow-through characteristics for the recovery of silver from silver-containing waste fluids |