玻璃分相法脱除CRT屏玻璃中重金属钡  

Barium recovery from CRT panel glass through phase separation process

作　　者：邢明飞[1,2] 傅泽刚[2] 王净宇 高志东 张志远[4] XING Mingfei;FU Zegang;WANG Jingyu;GAO Zhidong;ZHANG Zhiyuan(Henan Key Laboratory Cultivation Base of Mine Environmental Protection and Ecological Remediation,Henan Polytechnic University,Jiaozuo 454000,China;Institute of Resource and Environment,Henan Polytechnic University,Jiaozuo 454000,China;Henan Development and Reform Commission,Zhengzhou 450018,China;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

机构地区：[1]河南理工大学河南省高校矿山环境保护与生态修复省级重点实验室培育基地,焦作454000 [2]河南理工大学资源环境学院,焦作454000 [3]河南省发展和改革委员会,郑州450018 [4]中国科学院生态环境研究中心,北京100085

出　　处：《环境工程学报》2018年第10期2952-2958,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51508165);河南省教育厅科学技术研究重点项目(13140055);河南省高校矿山环境保护与生态修复省级重点实验室培育基地开放基金资助项目(KF2014-02)

摘　　要：玻璃分相的方法可以将重金属钡从CRT屏玻璃中高效脱除。该方法将CRT屏玻璃与一定量的B_2O_3混合后在空气气氛下进行热分相处理。在热分相处理过程中,屏玻璃中的B_2O_3与SiO_2逐渐分离,形成2个独立的相(富B_2O_3相和富SiO_2相)。CRT屏玻璃中的重金属钡和其他碱金属氧化物在分相过程中主要富集在呈网状连通结构富B_2O_3相中。将分相处理产物经5 mol·L^(-1)的硝酸在90℃条件下浸泡30 min,即可将富B_2O_3相以及其中包含的重金属钡一并去除,得到SiO2含量超过95%的高硅氧玻璃粉末。实验结果表明,当反应温度为1 100℃,B_2O_3添加量为30%,保温时间为30 min时,钡的脱除率可以达到98.84%,为废弃CRT屏玻璃无害化处理与资源化利用提供了一条新的途径。Heavy metal Ba was effectively removed from waste CRT panel glass by glass phase separation. CRT panel glass was remelted with B2O3 under air atmosphere. During the phase separation process, the glass phase separated into two phases which were B2O3-rich phase and SiO2-rich phase. Most of BaO and other metal oxides contained in the CRT panel glass were mainly concentrated in the interconnected network of B2O3-rich phase. The interconnected B2O3-rich phase and BaO can be completely leached out by 5 mol·L-1 HNO3 at 90℃ for 30 min. The remaining SiO2-rich phase was consisting almost entirely of silica（ purity 〉 95% ） . The experimental results show that the barium removal rate can reach 98.84% by setting the temperature, B2O3 added amount and holding time at 1 100℃, 30% and 30 min, respectively. Therefore, this study may provides a new process for the detoxification and reclamation of waste CRT panel glass.

关 键 词：电子废弃物 CRT屏玻璃 玻璃分相 钡脱除 高硅氧玻璃 

分 类 号：X705[环境科学与工程—环境工程]