title: Lead recovery and high silica glass powder synthesis from waste CRT funnel glasses through carbon thermal reduction enhanced glass phase separation process.
abstract: In this study, a novel process for the removal of toxic lead from the CRT funnel glass and synchronous preparation of high silica glass powder was developed by a carbon-thermal reduction enhanced glass phase separation process. CRT funnel glass was remelted with B2O3in reducing atmosphere. In the thermal process, a part of PbO contained in the funnel glass was reduced into metallic Pb and detached from the glass phase. The rest of PbO and other metal oxides (including Na2O, K2O, Al2O3,BaO and CaO) were mainly concentrated in the boric oxide phase. The metallic Pb phase and boric oxide phase were completely leached out by 5mol/L HNO3. The lead removal rate was 99.80% and high silica glass powder (SiO2purity >95wt%) was obtained by setting the temperature, B2O3added amount and holding time at 1000°C, 20% and 30mins, respectively. The prepared high silicate glass powders can be used as catalyst carrier, semipermeable membranes, adsorbents or be remelted into high silicate glass as an ideal substitute for quartz glass. Thus this study proposed an eco-friendly and economical process for recycling Pb-rich electronic glass waste.
authors.affiliation: Henan Key Laboratory Cultivation Base of Mine Environmental Protection and Ecological Remediation, Henan Polytechnic University, Jiaozuo 454000 Henan China; Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000 Henan China.
authors.forename: Mingfei
authors.initials: M
authors.lastname: Xing
authors.affiliation: Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000 Henan China.
authors.forename: Zegang
authors.initials: Z
authors.lastname: Fu
authors.affiliation: School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan China. Electronic address: wangyp326@163.com.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo 454000 Henan China.
authors.forename: Jingyu
authors.initials: J
authors.lastname: Wang
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Zhang
keywords: CRT funnel glass; Carbon-thermal reduction; Glass phase separation; Hazardous waste; Lead recovery