Method for the recovery of rare earth oxides
Abstract
Abstract A PROCESS IS DISCLOSED THAT IS SUITABLE FOR RECOVERING RARE EARTH OXIDE PHOSPHORS FROM AN IMPURE MATERIAL CONTAINING RARE EARTH OXIDES CONTAMINATED WITH OTHER PHOSPHORS USED IN COLOR TELEVISION CATHODE RAY TUBES. THE PROCESS COMPRISES: HEATING THE IMPURE MATERIAL TO REMOVE VOLATILE MATERIAL, FORMING AN AQUEOUS MATERIAL CONTAINING THE IMPURE RARE EARTH MATERIAL, ADJUSTING THE TEMPERATURE OF THE MIXTURE TO ABOUT 80*C., MAINTAINING THE PH OF THE MIXTURE AT FROM ABOUT 3 TO ABOUT 5 TO DISSOLVE THE RARE EARTH OXIDES, SEPARATING THE SOLIDS FROM THE MIXTURE TO FORM A LIQUID PHASE CONTAINING THE RARE EARTH VALUES AND PRECIPITATING THE RARE EARTH VALUES AND CONVERTING SAID RARE EARTH VALUES TO RARE EARTH OXIDE PHOSPHORS.
Inventors
- 👤 Robert E Dodds
Bibliographic Details
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