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

Abstract

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, CO 2 absorption, Ca(OH) 2 dehydration, PVC derived char oxidation, PbCl 2 formation and volatilization, CaCO 3 decarbonation, and CaCl 2 volatilization. Kinetic analysis of the PbCl 2 volatilization showed that the reaction of CRT glass during TGA resembles that of amorphous PbSiO 4 , while the reaction in the tube reactor was similar to that of crystalline PbSiO 4 . Crystallization accelerates PbCl 2 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.

Recovery of rare earths from waste cathode ray tube (CRT) phosphor powder by selective sulfation roasting and water leaching

“…A N U S C R I P T more effective collection of different types of waste which are therefore now readily available for recycling treatments. Several innovative attempts for partial or complete recycling of the waste CRT material have been proposed in the literature and these attempts were critically evaluated elsewhere (Ciftci and Cicek, 2017;De Michelis et al, 2011;Dexpert-Ghys et al, 2009;Grause et al, 2016;Herat, 2008;Innocenzi et al, 2013aInnocenzi et al, , 2013bMeng et al, 2016;Okada and Yonezawa, 2014;Morais, 2010, 2015;Strauss et al, 2017;Tian et al, 2016;Van Den Bogaert et al, 2015;Xu et al, 2013;Yao et al, 2016;Yin et al, 2016;Yu-Gong et al, 2016).…”

Waste-to-Reuse Foam Glasses Produced from Soda-Lime-Silicate Glass, Cathode Ray Tube Glass, and Aluminium Dross

“…The amount of CRT glass arising from computer monitors and TV sets increases dramatically due to their replacement by the liquid crystal display (LCD) [41,42]. The CRT part of monitors contains many hazardous elements (lead, strontium, antimony, barium, europium, selenium) [42][43][44][45][46][47][48][49]. The presence of lead in CRT glass makes recycling difficult and requires special safety handling.…”