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Recycling 2016, 1(1), 111-121; doi:10.3390/recycling1010111

Thermogravimetric Investigation of the Lead Volatilization from Waste Cathode-Ray Tube Glass

Graduate School of Environmental Studies, Tohoku University, Aramaki Aza Aoba 6-6-07 Aoba-ku, Sendai 980-8579, Japan
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Received: 21 December 2015 / Accepted: 3 February 2016 / Published: 6 February 2016
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Abstract

The treatment of lead-containing cathode-ray tube (CRT) glass is an important environmental issue. One approach is the removal of lead by chloride volatilization. In the present work, the reaction of CRT glass with PVC as the chlorinating agent and Ca(OH)2 as the chlorine absorber was investigated by thermogravimetric analysis (TGA) in air. Seven reaction steps occurring at different temperatures were identified as dehydrochlorination of PVC/HCl absorption, CO2 absorption, Ca(OH)2 dehydration, PVC derived char oxidation, PbCl2 formation and volatilization, CaCO3 decarbonation, and CaCl2 volatilization. Kinetic analysis of the PbCl2 volatilization showed that the reaction of CRT glass during TGA resembles that of amorphous PbSiO4, while the reaction in the tube reactor was similar to that of crystalline PbSiO4. Crystallization accelerates PbCl2 volatilization, and it might be advantageous for lead removal to crystallize the glass deliberately before or during treatment in order to reduce processing time and increase efficiency. View Full-Text
Keywords: poly(vinyl chloride); absorption; kinetics; amorphous; crystallization poly(vinyl chloride); absorption; kinetics; amorphous; crystallization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Grause, G.; Takahashi, K.; Yoshioka, T. Thermogravimetric Investigation of the Lead Volatilization from Waste Cathode-Ray Tube Glass. Recycling 2016, 1, 111-121.

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