| 摘要 |
<p>PURPOSE: A method of recovering a base phosphor from encapsulated phosphors and an economical process for recovering electroluminescent phosphor from encapsulated material are provided. CONSTITUTION: The method of recovering a base phosphor from encapsulated phosphors 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 and washing 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 325 mesh screen to yield a recovered base phosphor, wherein the first batch of concentrated hydrochloric acid is 36 wt.%, the second batch of hydrochloric acid is 1 molar, and the time sufficient to form the dried filter cake is about 3 hours.</p> |
