公开(公告)号：US06562260B2

公开(公告)日：2003-05-13

申请号：US09963963

申请日：2001-09-26

申请人： Richard G. W. Gingerich ,  Chen-Wen Fan ,  Keith A. Klindinst

发明人： Richard G. W. Gingerich ,  Chen-Wen Fan ,  Keith A. Klindinst

IPC分类号： C09K1102

CPC分类号： C09K11/01 ,  Y02W30/72

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 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° 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° 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.