| Patents for C22B 59 - Obtaining rare earth metals (1,691) |
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| 08/08/1990 | CN1009115B Process for treatment of rare earth metals |
| 07/25/1990 | CN1044129A Catalysising. crystallizing and growing of columbite from a kind of slag |
| 07/11/1990 | CN1043752A Process for extracting scandium from ore |
| 07/03/1990 | US4938934 Recovery of cesium chloride from pollucite ore |
| 05/30/1990 | CN1042570A High-purity terbium oxide preparation by use of fractional extraction method |
| 05/30/1990 | CN1042526A Prepn. of high purity yttrium oxide and lanthanum oxide |
| 05/23/1990 | CN1008083B Rare-earth separating method with multiple outlets by one step extraction |
| 05/22/1990 | US4927609 Recovery of gallium/rare earth values from oxide mixtures thereof |
| 05/09/1990 | CN1042024A Method of de-calcifying rare-earth metals formed by a reduction-diffusion process |
| 05/09/1990 | CN1007908B Continuous horizontal vacuum band-type filter machine and percolation filtration-dipping process |
| 04/18/1990 | EP0364089A1 Method of de-calcifying rare-earth metals formed by a reduction-diffusion process |
| 04/17/1990 | US4917724 Method of decalcifying rare earth metals formed by the reduction-diffusion process |
| 04/11/1990 | CN1041183A Process for separation of rare-earth elements |
| 03/13/1990 | US4908108 Electrolytic oxidation of cerium 3+ values to cerium 4+ values |
| 03/06/1990 | US4906493 Method of preparing coatings of metal carbides and the like |
| 02/28/1990 | EP0355159A1 Mixing-settling apparatus for liquid-liquid extraction |
| 02/06/1990 | US4898613 Gadolinium, terbium, dysprosium, holmium, erbium, thulium, and/or ytterbium; inexpensive |
| 01/23/1990 | US4895709 Low temperature pyrolysis |
| 01/23/1990 | US4895592 High purity sputtering target material and method for preparing high purity sputtering target materials |
| 01/02/1990 | US4891163 Method of processing nuclear fuel scraps |
| 12/13/1989 | CN1037929A Process for producing titanium,zirconium,chromium,samarium and neodymium metals from their oxides |
| 12/13/1989 | CN1037875A Stocking impregnation technology for ion-adsorption type of rare-earth minerals |
| 11/29/1989 | EP0343378A1 Process for producing metallic titanium, zirconium, chromium, samarium or neodymium from their oxides |
| 11/08/1989 | CN1036937A Process for fractionating mixture of rare earth metals by ion exchange |
| 10/04/1989 | EP0335538A2 Process for fractionating a mixture of rare earth metals by ion exchange |
| 09/27/1989 | EP0334077A1 Method for recovering refractory compositions from investment casting shell molds |
| 09/13/1989 | EP0332512A1 Process for electrochemically oxidising cerium 3+ to cerium 4+, in an emulsion |
| 09/06/1989 | CN1035322A Method for preparing metallic yttrium |
| 08/16/1989 | EP0327851A2 Method for recovering casting refractory compositions from investment casting slurries and from cores |
| 07/19/1989 | CN1033976A Precipitation of rare earths with a mixed precipitant |
| 07/04/1989 | US4845201 Process for producing organolanthanides, the resultant compounds and their use |
| 06/29/1989 | WO1989005684A1 Mixing-settling apparatus for liquid-liquid extraction |
| 06/14/1989 | EP0319770A1 Process for recovering samarium and europium from the depleted bath mixture in the molten-salt-electrolysis preparation of mischmetal |
| 06/07/1989 | CN1004427B Metallothermic reduction of rare earth oxides |
| 05/09/1989 | CA1253721A1 Neodymium alloys and process for preparing the same |
| 05/03/1989 | EP0313647A1 Ion exchange method for separation of scandium and thorium |
| 05/02/1989 | US4826666 Method of preparing metal carbides and the like and precursors used in such method |
| 04/18/1989 | CA1252751A1 Process for the separation of cerium and rare earths |
| 04/12/1989 | CN1003865B Smelting of rare earth fine ore briquettes (or lumps) to prepare rare earth fine slag and niobium ferric phosphorate |
| 03/28/1989 | US4816233 Ion exchange method for the recovery of scandium |
| 03/28/1989 | US4815516 Method for recovering casting refractory compositions from investment casting shell molds |
| 03/15/1989 | EP0306980A1 An ion exchange method for the recovery of scandium |
| 02/28/1989 | US4808384 Acid digestion, reduction, separation, extraction, stripping; precipitating impurities |
| 01/24/1989 | US4799530 Gelation, solidification, pulverization, oxalate precipitate |
| 01/11/1989 | EP0298843A1 Process for separating rare earths by liquid-liquid extraction using solvents containing halogens or carboxylic acids |
| 01/11/1989 | EP0298842A1 Process for separating rare earths by liquid-liquid extraction using fluoride-type solvents |
| 12/06/1988 | US4789534 Pyroysis of metal amide |
| 11/22/1988 | US4786319 Proces for the production of rare earth metals and alloys |
| 11/03/1988 | WO1988008323A1 Ion exchange method for separation of scandium and thorium |
| 11/02/1988 | CN88101564A Process for separation of rare earth elements by liquid-liquid extraction |
| 10/26/1988 | CN88101566A Rare-earth elements liquid-liquid extracting method |
| 09/28/1988 | EP0284504A1 Process for the liquid-liquid extraction of rare-earth metals |
| 09/28/1988 | EP0284503A1 Process for the liquid-liquid extraction of rare earth metals |
| 09/21/1988 | CN87101822A Complete-separation process of rare-earth elements from medium-gadolinium and rich-europium ion type rare-eatrh ore |
| 09/13/1988 | US4770702 With iron and boron, magnetic |
| 09/06/1988 | US4769063 Method for producing rare earth alloy |
| 08/30/1988 | US4767455 Process for the preparation of pure alloys based on rare earths and transition metals by metallothermy |
| 08/30/1988 | US4767450 Process for producing the rare earth alloy powders |
| 08/23/1988 | US4765909 Ion exchange method for separation of scandium and thorium |
| 08/09/1988 | CA1240154A1 Metallothermic reduction of rare earth oxides |
| 08/03/1988 | EP0277061A2 Process for obtaining organolantharides, compounds so obtained and their use |
| 08/03/1988 | EP0276544A1 Method for induction melting reactive metals and alloys |
| 07/19/1988 | US4758412 Production of rare earth hydroxides from phosphate ores |
| 07/06/1988 | EP0273835A1 Metallothermal process for the manufacture of pure alloys based on rare earth metals and transition metals |
| 06/22/1988 | EP0272250A1 Process for the production of neodym alloys |
| 06/15/1988 | CN87107972A Rare-earth seperating method with multiple outlets by one step extraction |
| 06/14/1988 | US4751061 Process for recovering scandium from waste material |
| 06/08/1988 | CN86108135A Separation of rare-earth element dysprosium by liquid-liquid extraction separation |
| 05/18/1988 | CN86101332B Process for separation of cerium and rare earths |
| 05/17/1988 | US4744960 Precipitation, solvent extraction |
| 05/11/1988 | CN86107455A Grouping separation purifying gadolinium with solvent extraction |
| 05/04/1988 | EP0265547A1 Method of recovering rare earths, and in a given case, uranium and thorium from heavy phosphate minerals |
| 04/27/1988 | EP0265413A2 Process for the manufacture of rare-earth metals and of alloys containing rare-earth metals |
| 04/19/1988 | US4738713 In segmented metal crucible using alternating current |
| 04/12/1988 | US4737248 Electrolytic reduction of fluorides in molten bath with iron cathode |
| 03/09/1988 | CN86105043A Extracting rare-earth elements from sulphuric acid system |
| 02/23/1988 | US4726938 Liquid/liquid extraction/purification of impure solutions of rare earth values |
| 02/23/1988 | CA1233025A1 Separation of rare earths by means of liquid-liquid extraction |
| 02/17/1988 | CN86101311A Technology for extracting rubidium and caesium from magmatic rock or weathering crust |
| 02/16/1988 | US4725312 Production of metals by metallothermia |
| 02/03/1988 | CN85102244B Phosphonates lle separation of rare earth elements |
| 01/12/1988 | US4718996 Recovery of tungsten, scandium, iron, and manganese values from tungsten bearing material |
| 01/12/1988 | US4718995 Recovery of tungsten, scandium, iron, and manganese from tungsten bearing material |
| 01/07/1988 | EP0250666A1 Process for selective dialysis using polymeric affinity adsorbents and size selective membranes |
| 11/25/1987 | CN86103403A New process of extracting rare earth metal from rare earth ore |
| 11/24/1987 | CA1229489A1 Process for separating and purifying metallic elements by displacement chromatography |
| 10/14/1987 | CN87102206A Metal thermal reduction for rare earth cloride |
| 09/23/1987 | EP0238402A1 Process for separating rare earths |
| 09/23/1987 | EP0238185A1 Metallothermic reduction of rare earth chlorides |
| 09/23/1987 | EP0237587A1 Method for producing a rare earth alloy and rare earth alloy |
| 09/22/1987 | US4695427 Calcium oxide lined container |
| 09/16/1987 | CN86102344A Method for producing rare earth alloy |
| 09/09/1987 | EP0236221A1 Process for lithiothermically producting metallic powders |
| 08/19/1987 | EP0233121A1 Process for removing lead from rare earths |
| 08/05/1987 | CN86100333A Neodymium chloride electrolytic and vacuum distillating method to manufacture metallic neodymium |
| 07/22/1987 | EP0229516A1 Process and use of an apparatus for producing dysprosium-iron alloy and neodymium-dysprosium-iron alloy |
| 07/21/1987 | US4681623 Process for producing alloy powder containing rare earth metals |
| 07/14/1987 | US4680055 Metallothermic reduction of rare earth chlorides |
| 06/30/1987 | US4676957 Electrolytic separation of cerium/rare earth values |
| 06/02/1987 | US4670228 Mixing with sulfur compound, combusiton, extraction |