Lead mechanochemical sulfidation of fluorescent tube core glass
WU Ze-bing1, MENG Wen1, WANG Xiao-yan1,2, ZHANG Zi-wei1, YUAN Wen-yi2,3, WANG Lin-cai2,3, ZHANG Cheng-long2,3, BAI Jian-feng2,3, WANG Jing-wei2,3
1. School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai 201209, China;
2. Research Center of Resource Recycling Science and Engineering, Shanghai Polytechnic University, Shanghai 201209, China;
3. Shanghai Collaborative Innovation Centre for Waste Electrical and Electronic Equipment Recycling, Shanghai Polytechnic University, Shanghai 201209, China
With sodium sulfide as the vulcanizing agent, the lead in the fluorescent tube core glass was rapidly transformed to lead sulfide by mechanochemical sulfidation. The different conditions of mechanochemical sulfidation, that is, milling time, milling speed and ball-to-material ratio were investigated by single factor experiment. And the structural properties of samples after mechanochemical sulfidation were characterized by SEM, XRD and particle size. The results showed that the sulfidation rate increased with the increase of milling time and milling speed, increased first and then decreased with the increase of ball-to-material ratio. When the milling speed was 750r/min, the milling time was 120min and the ball-to-material ratio was 50:1g/g, the lead sulfidation rate in the fluorescent tube core glass was 96.18%. The mechanochemical sulfidation product of lead in fluorescent lamp tube core glass was PbS. The particle size of fluorescent lamp core glass powder decreased with the increase of milling speed and milling time.
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