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Characterization of residue from leached cathode ray tube funnel glass: reutilization as white carbon black |
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| Authors: | Wenyi Yuan Zhitong Yao Qiwu Zhang Jinhui Li |
| Institution: | 1. Shanghai Cooperative Center for WEEE Recycling, Shanghai Second Polytechnic University, Jinhui Road 2360, Pudong District, Shanghai, 201209, China 2. College of Materials Science and Environmental Engineering, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou, 310018, China 3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aobaku, Sendai, 9808577, Japan 4. School of Environment, Sino-Italian Environment and Energy Building, Tsinghua University, Beijing, 100084, China |
| Abstract: | Cathode ray tube (CRT) funnel glass remains an urgent environmental problem and is composed mainly of lead oxide and silicon oxide. In this research, the residue could be obtained from 2 h to 500 rpm activated CRT funnel glass after extracting lead via acid leaching under the conditions of HNO3 concentration 1.0 mol/L, leaching temperature 95 °C and leaching time 1 h. In order to reutilize the residue, its physico-chemical properties were characterized by scanning electron microscopy, Brunauer–Emmett–Teller, thermogravimetric analysis, X-ray diffraction and Fourier transform infrared spectroscopy. The results indicated that the residue was an amorphous superfine powder with approximately 93 wt% silica oxide and specific surface area of more than 170 m2/g. It can be reutilized as white carbon black. |
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