| Patents for C22B 59 - Obtaining rare earth metals (1,691) |
|---|
| 08/16/1994 | US5338520 Recovery of neodymium/didymium values from bastnaesite ores |
| 06/23/1994 | WO1994013845A1 Process for extracting rare-earth elements from phosphate ore |
| 06/07/1994 | CA1329990C Method for induction melting reactive metals and alloys |
| 05/25/1994 | CN1087126A Process for extracting high-purity europium oxide |
| 05/24/1994 | US5314526 With calcium chloride |
| 04/12/1994 | CA1328422C Process for the electrochemical oxydation in an emulsion of cerium 3+ into cerium 4+ |
| 03/30/1994 | CN1084574A Extractant for separating rare-earth metal |
| 12/28/1993 | US5274129 Hydroxamic acid crown ethers |
| 12/28/1993 | US5273725 Concentrating radionuclide products by digesting with an aqueous solution of boric acid and a mineral acid; using a cation reactant to precipitate fluoride compounds |
| 12/01/1993 | CN1078924A Quartz glass apparatus for heavy rare earth strip liquor concentration after double effect evapouration of high acid |
| 12/01/1993 | CN1078923A Process for the separation of certain elements from aqueous solutions resulting from the reprocessing of spent nuclear fuels |
| 11/30/1993 | US5266282 Selective liquid/liquid extraction of yttrium from other rare earths values |
| 11/02/1993 | US5258167 Extractant for rare earth metal and method for extracting the same |
| 10/19/1993 | CA1323200C Rare earth separation process |
| 10/13/1993 | CN1022445C Rare earth alloy |
| 09/08/1993 | EP0559537A1 Process for the separation of elements from aqueous solutions coming from the reprocessing of nuclear fuel |
| 09/04/1993 | CA2090812A1 Process for the separation of certain elements from aqueous solutions resulting from the reprocessing of spent nuclear fuels |
| 08/24/1993 | US5238489 Selectively dissolving mixture of alloy particles, froth flotation, separation |
| 07/06/1993 | US5225173 Chelation, crown ethers |
| 06/29/1993 | US5223232 Solvent extraction of solutions from irradiated nuclear fuel reprocessing plants |
| 06/23/1993 | CN1073487A Process for the extraction of cerium from an aqueous solution of a mixture of rare-earth elements |
| 06/01/1993 | US5215664 Separation of rare earth elements with high-speed countercurrent chromatography |
| 05/12/1993 | EP0541158A1 Process for extracting cerium from an aqueous solution containing a mixture of rare earth elements |
| 05/04/1993 | US5207995 Recovery of cerium from fluoride-containing ores |
| 03/09/1993 | US5192443 Using phosphorous oxide derivatives as extractants for rare earth nitrates |
| 02/23/1993 | US5188735 Separation of rare earth values by liquid/liquid extraction |
| 01/13/1993 | EP0522234A1 Method for extracting rare-earth elements from phosphate ore |
| 12/30/1992 | CN1019639B Solvent extraction |
| 12/29/1992 | US5174975 Low temperature pyrolysis |
| 12/29/1992 | US5174811 Method for treating rare earth-transition metal scrap |
| 11/03/1992 | CA1309596C Rare earths liquid-liquid extraction separation process |
| 11/03/1992 | CA1309595C Rare earths liquid-liquid extraction separation process |
| 10/28/1992 | CN1018818B Precipitation of rare-earth with a mixed precipitant |
| 10/21/1992 | CN1065495A Process for smelting rare-earth alloy using rare-earth-contained waste slag |
| 10/13/1992 | US5154897 With glass adsorbent to preferentially adsorb daughter isotopes |
| 09/23/1992 | EP0505277A1 Method for separating iron and/or zirconium from actinides and/or lanthanides present in an aqueous acid solution using a propane diamide |
| 09/02/1992 | CN1064110A Process for treatment of ores containing rare earths |
| 09/02/1992 | CN1064109A Process for treatment of ores containing rare earths |
| 08/26/1992 | CN1063905A Production process of high-purity neodymium metal |
| 08/26/1992 | CN1017983B Clustering method for fractional distillation extraction of gadolinium, terbium, dysprosium and yttrium |
| 08/19/1992 | CN1017887B Obtaining lanthanides by extraction and separation of solvent |
| 08/12/1992 | EP0355159B1 Mixing-settling apparatus for liquid-liquid extraction |
| 07/14/1992 | US5129945 Scrap treatment method for rare earth transition metal alloys |
| 07/01/1992 | EP0492681A2 Metallothermic reduction of rare earth fluorides |
| 07/01/1992 | CN1017261B Stocking impregnation technology for ion-adsorption type of rare-earth minerals |
| 05/20/1992 | CN1016709B Process for treatment of rare earth metals ores |
| 05/19/1992 | CA1300896C Metallothermic reduction of rare earth chlorides |
| 05/13/1992 | EP0485256A1 Process for the separation of the rare earths |
| 04/29/1992 | CN1060683A Samarium-made reaction container and method |
| 04/15/1992 | CN1060314A Magnetic levitation cooling technology for obtaining high-purity rare-earth metals |
| 03/11/1992 | CN1015801B Preparation method of high purity yttrium oxide and lanthanum oxide |
| 02/11/1992 | US5087291 Melting scrap, formig slag by reacting the impurity and rare earth metals to reduce the impurity concentration and separating the slag and the melt for reuse |
| 01/22/1992 | EP0467180A2 Rare earth/transition metal alloy scrap treatment method |
| 01/18/1992 | CA2047162A1 Rare earth/transition metal alloy scrap treatment method |
| 01/15/1992 | CN1015295B Rare earth alloy powder and process for producing the same |
| 12/04/1991 | CN1014976B High-purity terbium oxide preparation by use of fractional extraction method |
| 11/13/1991 | EP0220198B1 Preparing metal compounds by pyrolysis |
| 10/30/1991 | CN1014510B Separation of rare-earth element dysprosium by liquid-liquid extraction separation |
| 10/16/1991 | CN1055393A Process for separation of yttrum |
| 10/09/1991 | EP0451003A1 Process for the separation of yttrium |
| 09/24/1991 | US5050997 Mixer-settler for liquid-liquid extraction |
| 09/17/1991 | US5049363 Recovery of scandium, yttrium and lanthanides from titanium ore |
| 09/11/1991 | CN1054502A 稀土合金 Rare earth alloy |
| 09/10/1991 | CA1288765C Lignin having sulfur and phosphorus groups |
| 09/05/1991 | WO1991012867A1 Separation of rare earth elements with high-speed countercurrent chromatography |
| 09/03/1991 | US5045209 From zircon and rutile wastes, digestion with acid, ion exchanging, calcination to oxide |
| 08/13/1991 | US5039336 Fluidized bed chlorination |
| 07/24/1991 | CN1013323B Method for producing rare earth alloy |
| 07/23/1991 | CA1286507C Process for the preparation of the lithiothermy of powdered metals |
| 07/09/1991 | US5030424 Digestion with dilute acid, separation |
| 06/18/1991 | CA1284886C Treatment process of rare earth ores |
| 06/18/1991 | CA1284885C Treatment process of lanthanum and for yttrium ore |
| 05/22/1991 | CN1012646B Catalysising crystallizing and growing method of columbite from kind of slag |
| 05/14/1991 | US5015447 Recovery of rare earth elements from sulphurous acid solution by solvent extraction |
| 05/07/1991 | USH920 Method of removing cesium from steam |
| 04/30/1991 | US5011665 Nonpolluting recovery of rare earth values from rare earth minerals/ores |
| 04/17/1991 | EP0422970A1 Method of treating rare-earth minerals |
| 03/20/1991 | EP0418125A1 Process for treating ores containing rare earths |
| 03/14/1991 | CA2025152A1 Processing of ores containing rare-earth elements |
| 03/14/1991 | CA2025151A1 Processing of ores containing rare-earth elements |
| 02/13/1991 | CN1049188A Recovery of scandium, yttrium and lanthanides from titanium ore |
| 02/12/1991 | US4992096 Metallothermic reduction or rare earth metals |
| 02/12/1991 | CA1280014C Process for producing the rare earth alloy powders |
| 02/04/1991 | CA2022600A1 Recovery of scandium, yttrium and lanthanides from titanium ore |
| 01/29/1991 | US4988487 Demetallization, reduction, leaching, digestion, precipitation, oxidation |
| 01/22/1991 | CA1279195C Purification process for aqueous solutions of rare earth salts through liquid-liquid extraction |
| 01/19/1991 | CA2021415A1 Recovery of rare earth elements from sulphurous acid solution by solvent extraction |
| 12/12/1990 | CN1047700A Obtaining lanthanides by extraction and separation of solvent |
| 12/11/1990 | US4976939 Processing of rare earth ores |
| 12/05/1990 | CN1047534A Fractional distillation extraction gadolinium, terbium, dysprosium, yttrium clustering method |
| 11/22/1990 | EP0398149A1 Recovery of cesium chloride from pollucite ore |
| 11/06/1990 | US4968504 Recovery of scandium and uranium |
| 10/23/1990 | US4965053 Potassium chlorate or ammonium chloride added to ion exchange solution |
| 10/16/1990 | US4963264 Process for selective dialysis using polymeric affinity adsorbents and size selective membranes |
| 10/10/1990 | EP0355159A4 Mixing-settling apparatus for liquid-liquid extraction |
| 09/19/1990 | EP0388250A1 Method of treating rare-earth minerals |
| 09/04/1990 | US4954293 Decomposition with sodium hydroxide |
| 09/03/1990 | CA2011347A1 Rare earth mimeral processing method |
| 08/29/1990 | CN1009332B Extracting rare-earth elements from sulphuric acid system |
| 08/08/1990 | CN1044409A Solvent extraction |