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Recycling of Scrap Cathode Ray Tubes

TitleRecycling of Scrap Cathode Ray Tubes
Publication TypeJournal Article
Year of Publication2002
AuthorsLee C-H, Hsi C-S
Journal TitleEnviron. Sci. Technol.
AbstractIt is estimated that approximately 50% of the weight of acomputer monitor is composed of cathode ray tube (CRT)glass. Thus, the successful recycling of scrap CRT glasscan greatly relieve the disposal problem created by scrapmonitors. CRT glass may be considered a hazardouswaste due to its high lead concentration. A CRT can bedivided into panel (front) glass and funnel (back) glass. Severalcoatings have been applied to the surface of the CRTpanel and funnel glass. These coatings may present anadverse effect to the environment by obstructing the recyclingand reuse of the CRT glass. To recycle CRT glass, aseries of tests has been conducted to remove the coatingsfrom scrap CRT glass. In this study, the CRT panel andfunnel glass obtained from scrap computer monitors wascleaned by wet-scrubbing and ultrasonic cleaningmethods. This cleaned CRT glass is intended to be recycledand reused by CRT manufacturers. This study showsthat the wet-scrubbing method has a better coating removalperformance and no associated pollution problem (i.e.,no additional chemical additives). Thus, the wet-scrubbingmethod is recommended for use as a CRT coatingremoval method. The results of these tests are presentedin this paper.
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