Osram Sylvania Inc.

Keith A Klindinst

Chen-Wen Fan

Richard G W Gingerich

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 to 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 about 90&deg; 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; decanting and washing the remaining solids with deionized water; filtering the remaining solids to form a filter cake; heating the filter cake at 110&deg; C. in air for a time sufficient to form a dried filter cake; and screening the dried filter cake through a &minus;325 mesh screen to yield a recovered base phosphor.

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Hudson, MA, United States of America

Keith A Klindinst