Patents
Sitemap › C01 - Inorganic chemistry › C01F - Compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium, or of the rare-earth metals › C01F 17 - Compounds of the rare-earth metals, i.e. scandium, yttrium, lanthanum, or the group of the lanthanides
Patents for C01F 17 - Compounds of the rare-earth metals, i.e. scandium, yttrium, lanthanum, or the group of the lanthanides (4,902)
09/1991
09/03/1991US5045289 Formation of rare earth carbonates using supercritical carbon dioxide
08/1991
08/13/1991US5039336 Fluidized bed chlorination
08/07/1991EP0440516A1 Preparation process for binary sulphur compounds
08/06/1991US5037577 Method for producing yttrium-aluminum-garnet fine particles and yttrium-aluminum-garnet base phosphor fine particles
07/1991
07/30/1991US5035834 Novel cerium (IV) compounds
07/23/1991US5034201 Recovery of rare earth values from gypsum
07/10/1991CN1013101B Fractional extraction of rare-earth elements
07/09/1991US5030424 Digestion with dilute acid, separation
06/1991
06/26/1991EP0434222A1 Ultra high purity metal fluorides and their preparation
06/26/1991EP0433450A1 Method of obtaining complex oxides
06/19/1991EP0433133A1 Method for the preparation of an aqueous colloidal dispersion of a cerium IV compound and the dispersion thus prepared
06/18/1991CA1284886C Treatment process of rare earth ores
06/18/1991CA1284885C Treatment process of lanthanum and for yttrium ore
06/11/1991US5023070 Process for obtaining a ceric oxide
06/04/1991US5021397 Multistage processing, melting with carbonates, solidification treatment with acid and hydroxide, dissolving in acid, precipitation with oxalic acid, heating and mixing with alkaline earth metal and copper oxide
06/04/1991US5021192 Colloidal dispersions of cerium (IV) compound
05/1991
05/28/1991US5019362 Ion exchange method for the purification of scandium
05/21/1991US5017352 Catalysts
05/15/1991EP0427392A2 Improved method of casting a reactive metal against a surface formed from an improved slurry containing yttria
05/14/1991US5015452 Process for synthesis of uniform colloidal particles of rare earth oxides
05/14/1991US5015447 Recovery of rare earth elements from sulphurous acid solution by solvent extraction
05/08/1991EP0426578A1 Surface-treated ceric oxides and silicone-elastomers with improved flame-resistance containing them
05/07/1991US5013534 Morphologically improved rare earth trifluorides
05/04/1991CA2029211A1 Surface treated ceric oxides; silicone clastomers with improved flame resistance, containing said ceric oxides
04/1991
04/30/1991US5011671 Ceric oxide with new morphological characteristics and method for obtaining same
04/30/1991US5011665 Nonpolluting recovery of rare earth values from rare earth minerals/ores
04/18/1991WO1991004945A1 Formation of rare earth carbonates using supercritical carbon dioxide
04/09/1991US5006318 Size and morphology is controlled by solvothermal process
04/05/1991CA2026970A1 Formation of rare earth carbonates using supercritical carbon dioxide
04/02/1991US5004712 Method of producing optically transparent yttrium oxide
03/1991
03/27/1991EP0419318A1 Process for the recovery of rare earth values from gypsum
03/26/1991US5002747 Suspension, heating, cooling, and separation of a ceric hydroxide prior to calcining
03/21/1991CA2025675A1 Process for the recovery of rare values from gypsium
03/20/1991EP0418125A1 Process for treating ores containing rare earths
03/14/1991CA2025152A1 Processing of ores containing rare-earth elements
03/12/1991US4999180 Neodymium hydroxynitrate
02/1991
02/13/1991CN1049188A Recovery of scandium, yttrium and lanthanides from titanium ore
02/04/1991CA2022600A1 Recovery of scandium, yttrium and lanthanides from titanium ore
01/1991
01/29/1991US4988487 Demetallization, reduction, leaching, digestion, precipitation, oxidation
01/23/1991EP0409691A2 Oxide garnet single crystal
01/22/1991CA1279195C Purification process for aqueous solutions of rare earth salts through liquid-liquid extraction
01/19/1991CA2021415A1 Recovery of rare earth elements from sulphurous acid solution by solvent extraction
01/16/1991CN1048564A Ionic type rare earth ore in-situ lixiviation processing
01/16/1991CN1048531A Rare earth fluoride preparing method
01/16/1991CN1011247B Rare-earth hexaboronide synthesized by melted salt electrolysis technique
01/09/1991EP0407242A1 Dehydrated mixtures of rare earth halides and alkaline or alkaline-earth halides
01/02/1991CN1048239A Extraction process of pure cerous hydroxide
12/1990
12/27/1990EP0404385A1 Catalyst and process for the oxidation of carbonaceous particulates
12/26/1990CN1048018A Process for preparing europium sulfate
12/25/1990US4980141 Hexagonal-bipyramid crystalline scandium oxide powder and a process for preparing the same
12/22/1990CA2019489A1 Dehydrated mixtures of rare earth, alkaline or alkaline-earth metals halides
12/17/1990CA2019076A1 Catalytic treatment of carbonaceous particulates
12/12/1990CN1047700A Obtaining lanthanides by extraction and separation of solvent
12/12/1990CN1047699A Recovering gold and silver from difficultly processing gold ore
12/11/1990US4976939 Processing of rare earth ores
12/05/1990CN1047534A Fractional distillation extraction gadolinium, terbium, dysprosium, yttrium clustering method
11/1990
11/28/1990EP0333757A4 Ion exchange compositions
11/28/1990CN1010579B Recovering scandium from titanium-iron ore
11/27/1990US4973455 Recovery of lanthanides
11/21/1990CN1047110A Process for separating cerium dioxide from mixed rare earth
11/20/1990US4971734 Method of making nuclear fuel pellets, comprising producing and using pourable, frittable powders obtained directly by precipitation of peroxides
11/07/1990EP0396159A2 Ceric oxide contaning composition, its preparation and its uses
11/07/1990CN1010303B Photoreduction method of separating and extracting fluorescence-level europium sesquioxide from beneficiated rare-earth
11/06/1990US4968504 Recovery of scandium and uranium
11/06/1990US4968434 Recovering rare earth compounds from phosphoric acid solutions
11/06/1990CA1275783C Preparation of unagglomerated metal oxide particles with uniform particle size
10/1990
10/31/1990EP0395472A1 Dehydrated rare earth halides and process for its preparation
10/28/1990CA2015670A1 Dehydrated rare earths halides and process for production thereof
10/24/1990EP0393287A1 Process for treating scrap containing rare earth and cobalt
10/23/1990US4965057 Controlling particle sizes; hydrolyzing agueous solution of cerium salt, adding s02, heating
10/23/1990US4965053 Potassium chlorate or ammonium chloride added to ion exchange solution
10/23/1990US4964997 Dissolving residue with nitric acid, extracting with water-insoluble neutral organophosphoric extractant
10/23/1990US4964996 Liquid/liquid extraction of rare earth/cobalt values
10/04/1990WO1990011249A1 Method of obtaining complex oxides
10/03/1990CN1045812A Method for separating si, ca, la from yb by extraction
09/1990
09/26/1990EP0388567A1 Cerium oxide having a large specific surface, and its preparation process
09/26/1990CN1045605A Separation of heavy metals from rare earth solution
09/19/1990EP0388250A1 Method of treating rare-earth minerals
09/19/1990CN1009641B Process for producing cerium hydroxide
09/04/1990US4954451 Water insoluble cerium compound; urinalysis
09/04/1990US4954293 Decomposition with sodium hydroxide
09/03/1990CA2011347A1 Rare earth mimeral processing method
08/1990
08/29/1990CN1009332B Extracting rare-earth elements from sulphuric acid system
08/15/1990CN1044635A Preparation process of chlorinated rare-earth by use of rare-earthy slag as raw materials
08/14/1990US4947927 Containing hydroxyl compound
08/08/1990CN1044499A Extraction of rare-earth elements by circulating oxalic acid
08/08/1990CN1044409A Solvent extraction
08/08/1990CN1009115B Process for treatment of rare earth metals
08/08/1990CN1009077B Method and equipment for dissolving scandia in hn03
08/07/1990US4946608 Lubricant dispersions of rare earth halides in an oily medium
08/07/1990US4946607 Aqueous lubricant dispersions of rare earth halides
08/01/1990EP0379814A1 Rare earth oxide having controlled granulometric characteristics, and its preparation process
08/01/1990CN1008996B Oxidizing and roasting technique and apparatus of rare-earth oxalate
07/1990
07/18/1990EP0227499B1 Mixed lanthanum-magnesium aluminates, process for their production and lasers using these aluminates
07/11/1990CN1043752A Process for extracting scandium from ore
07/11/1990CN1043685A Process for extracting rare-earth from ion-type sulfuric acid immersion of rare-earth ore by liquid ammonia deposition
07/10/1990US4940685 Ceric oxide particulates having a stable specific surface and a process for their preparation
07/04/1990EP0376789A1 Process for the preparation of cerium oxide having a large specific surface
07/03/1990US4938871 Method for the recovery of actinides and/or lanthanides using novel extraction agents, and novel propane diamides, and the preparation thereof
07/03/1990US4938852 Recovery of europium (II) values by electrolysis
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