http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2316794-A3
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a55b89e44e80a65858c49141e8bce215 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01G43-01 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01G43-01 |
| filingDate | 2010-10-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_eccd08c9a1087868cfdfe668af9d5f93 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_def53e4933d80bf167f882120c1d114c http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c3c2678cd300b086aedbc3606b784b31 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7df053d593647931c694c2e330dd7d60 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c801df54d9e50cbcf2845a99336be16e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bfa6de07ad633d773138eee2bb8c92ac |
| publicationDate | 2011-05-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-2316794-A3 |
| titleOfInvention | A process for the preparation of uranium dioxide with spherical and irregular grains |
| abstract | The subject matter of the invention is a process for the preparation of uranium dioxide with spherical and irregular grains. n The process of the invention consists in that UO 3 and UO 2 (NO 3 ) 2 ·6H 2 O is dissolved upon vigorous stirring in an organic acid, preferably ascorbic acid. The resulting ascorbic-hydroxy-uranyl sol is treated in the following way: na) by evaporation to dryness and heat treatment at a temperature of 550°C with a heating rate of 5°C/min., in air atmosphere to U 3 O 8 ; subsequently, reduction in hydrogen atmosphere at 1100°C to irregular uranium dioxide grains. nb) subsequently, addition to 300 mL of an organic solvent, preferably 2-ethylhexanol-1 (EH) which contains 1 volume % of sorbitol monooleate (SPAN-80); subsequently, the spherical gel grains are filtered, washed with acetone and subjected to heat treatment at a temperature of 550°C with a heating rate of 5°C/min., in air atmosphere to U 3 O 8 ; subsequently, they are reduced, preferably in hydrogen atmosphere at 1100°C to spherical UO 2 grains with a diameter of 5 to 120 µm. n A variant of the process of the invention consists in that an organic acid in the solid form, preferably ascorbic acid, is added upon vigorous stirring in the 1:1 molar ratio to a solution of UO 2 (NO 3 ) 2 ·6H 2 O; subsequently, ammonia solution is added until the pH is 4. The resulting ascorbic-hydroxy-uranyl sol is treated as described above. |
| priorityDate | 2009-10-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 39.