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Recycling of scrap cathode ray tubes
Ching-Hwa Lee1, Chi-Shiung Hsi
1Department of Environmental Engineering, Da-Yeh University, Chang-Hwa, Taiwan, Republic of China. chl@mail.dyu.edu.tw
Environmental Science & Technology
|January 29, 2002
Summary
Recycling cathode ray tube (CRT) glass from monitors is crucial for waste reduction. Wet-scrubbing effectively removes glass coatings without pollution, making it ideal for CRT recycling.
Area of Science:
- Materials Science
- Environmental Science
- Chemical Engineering
Background:
- Cathode ray tube (CRT) glass constitutes about 50% of a computer monitor's weight.
- CRT glass, particularly due to its lead content, poses hazardous waste challenges.
- Surface coatings on CRT glass impede its recycling and reuse.
Purpose of the Study:
- To evaluate methods for removing coatings from scrap CRT glass.
- To facilitate the recycling and reuse of CRT glass by manufacturers.
- To identify an environmentally sound coating removal process.
Main Methods:
- Scrap CRT panel and funnel glass were cleaned using wet-scrubbing and ultrasonic cleaning.
- Coating removal efficiency was assessed for both methods.
- Environmental impact, including chemical additive use, was considered.
Main Results:
- Wet-scrubbing demonstrated superior coating removal performance compared to ultrasonic cleaning.
- The wet-scrubbing method generated no additional pollution or chemical waste.
- Ultrasonic cleaning's effectiveness and environmental impact were less favorable.
Conclusions:
- Wet-scrubbing is recommended as an effective and environmentally friendly method for removing coatings from CRT glass.
- This process supports the goal of recycling and reusing CRT glass in manufacturing.
- The findings contribute to sustainable electronic waste management strategies.