FIELD: chemistry.
SUBSTANCE: method includes the dissolution of the original product, taken in the form of chlorides fusion cake, in distilled water. The solution is treated by 40% hydrofluoric acid. The resulting sludge is dried, calcined in muffle furnace at a temperature of 650-800°C and mixed with calcium metal shavings taken from 15-20% excess of stoichiometrically required amount. Next, the mixture is pressed and smelted to obtain yttrium metal and slag containing europium fluoride and calcium.
EFFECT: enables to selectively remove europium and yttrium almost completely from the product recycling phosphors, significantly reducing the duration of the process of separation up to 3-4 hours.
1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF EXTRACTING RARE-EARTH METALS FROM PHOSPHOGYPSUM | 2011 |
|
RU2487834C1 |
| METHOD OF PROCESSING WASTES OF PHOSPHORS BASED ON ZINC SULPHIDE CONTAINING YTTRIUM AND EUROPIUM | 2015 |
|
RU2595314C1 |
| PROCESS FOR REGENERATING PHOSPHOR BASED ON ORTHOVANADATE OF RARE-EARTH ELEMENTS | 0 |
|
SU935523A1 |
| PROCESSING METHOD OF MICRO PRODUCTION WASTES OF CONSTANT MAGNETS | 2011 |
|
RU2469116C1 |
| LIGHT-CONVERTING MATERIAL AND COMPOSITION FOR PRODUCING SAID MATERIAL | 2007 |
|
RU2407770C2 |
| PROCESS FOR EXTRACTING RARE-EARTH METALS AND YTTRIUM FROM COALS AND ASH-SLAG WASTE MATERIAL OF COAL BURNING | 2005 |
|
RU2293134C1 |
| METHOD OF SEPARATING YTTRIUM AND YTTERBIUM FROM TITANIUM IMPURITIES | 2019 |
|
RU2713766C1 |
| METHOD FOR PROCESSING COMPLEX ORE CONTAINING NIOBIUM AND RARE EARTH ELEMENTS AS MAIN COMPONENTS | 2020 |
|
RU2765647C2 |
| METHOD OF PRODUCING YTTRIUM ALUMINIUM GARNET ALLOYED WITH RARE EARTH ELEMENTS | 2012 |
|
RU2503754C1 |
| METHOD FOR SYNTHESIS OF YTTRIUM ORTHOVANADATE-BASED PHOSPHOR | 2013 |
|
RU2548089C1 |
