RECOVERY OF ELECTROLUMINESCENT PHOSPHOR FROM ENCAPSULATED MATERIAL

摘要

A method of recovering a base phosphor from encapsulated phosphors, which comprises the steps of selecting a recovery vessel including a magnetic stir bar; adding t o the recovery vessel, deionized water, a first batch of concentrated hydrochloric acid and encapsulated phosphor to form a stirred suspension; heating the stirred suspension to abo ut 90.degree.C for about 2 hours; settling the stirred suspension; decanting the mother liquor and slurrying the remaining solids with a second batch of hydrochloric acid and water; decanti ng and washing the remaining solids with deionized water; filtering the remaining solids to form a filter cake; heating the filter cake at 110.degree.C in air for a time sufficient to form a dried filter cake; and screening the dried filter cake through a -325 mesh screen to yield a recovered base phosphor.