http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1475344-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_d2051317369a779747701bc0ebe411a4 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02W30-50 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K11-01 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K11-7708 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K11-7701 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K11-01 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K11-77 |
| filingDate | 1974-07-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1977-06-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1475344-A |
| titleOfInvention | Method for separating sulphide phosphor particles from mixtures with essentially nonoxidizable phosphor particles |
| abstract | 1475344 Separation of phosphor particles by flotation RCA CORPORATION 10 July 1974 [20 July 1973] 30593/74 Heading B2H [Also in Division C4] Oxidisable metal sulphide phosphor particles are separted from a mixture with non-oxidisable phosphor particles by forming an aqueous slurry containing the mixture, a mineral acid and an alkali nitrite. The metal sulphide phosphor particles are oxidised and rise and float on the surface under the influence of the gases produced by the reaction and may be removed therefrom by skimming or decantation. The non-oxidisable phosphor particles settle on the bottom. In one example an alkaline sludge produced from washing out television picture tubes and containing red-emitting europiumactivated yttrium oxysulphide, green-emitting copper- and aluminium-activated zinc-cadmium sulphide and blue-emitting silver activated zinc sulphide phosphor together with organic binders and aluminates is first digested with a hydrogen peroxide solution and is then acidified, washed dried and baked in air to remove organic material. The mixed phosphor powder is then formed into a slurry and treated with sulphuric acid and sodium nitrite whereby the green- and blue-emitting phosphor particles are oxidised and float on the surface, whereas the red-emitting phosphor particles settle on the bottom of the vessel. Another example describes the separation of red-emitting yttrium vanadate phosphor particles from a mixture containing blue- and green-emitting prosphors and aluminium metal particles in which the aluminium particles are first dissolved in an alkali hydroxide solution. |
| priorityDate | 1973-07-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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