CRT锥玻璃碳热还原强化玻璃分相脱铅  

Lead recovery from CRT funnel glass through carbon thermal reduction enhanced glass phase separation process

作　　者：邢明飞[1,2] 王净宇 张永慧 张东晖 付泽刚 张志远[4] 

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]焦作市环境保护局,焦作454000 [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》2017年第5期3036-3042,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);河南省教育厅科学技术研究重点项目基础研究(13140055)

摘　　要：通过碳热还原强化玻璃分相的方法实现CRT含铅锥玻璃高效脱铅的同时制备出高硅氧玻璃粉末。将锥玻璃与一定量B_2O_3混合后在还原气氛下进行热处理。在热处理过程中,锥玻璃中的部分氧化铅被还原成单质铅并从玻璃相中析出,剩下未被还原的氧化铅则主要富集在呈网状连通结构的富B_2O_3相中。析出的单质铅与富B_2O_3相通过5 mol·L^(-1)的硝酸高效去除。当锥玻璃与20%的B_2O_3混合均匀,在1 000℃还原气氛下保温30 min,铅的酸浸脱除效率可达99.80%,并得到SiO_2含量大于95%的高硅氧玻璃粉末。高硅氧玻璃粉末可作为催化剂载体、吸附剂或者重新熔炼制备成与石英玻璃类似的耐高温、透光性强的高硅氧玻璃,故为含铅玻璃的无害化与资源化利用提供了一条新的途径。In this study,toxic lead was removed from cathode-ray-tube funnel glass and synchronous preparation of high silica glass powder was developed using a carbon-thermal-reduction enhanced glass-phase-separation process.Part of the PbO contained in the funnel glass was reduced to metallic Pb and extracted from the glass.The remaining unreduced Pb O was mainly concentrated in the interconnected pore network of the B_2O_3 phase.Most of the metallic Pb phase and B_2O_3 were leached out using 5 mol·L^（-1）HNO_3.The optimum temperature,amount of added B_2O_3,and holding time for the process were 1 000 ℃,20%,and 30 min,respectively.The lead removal rate was 99.80% and porous SiO_2（purity95%） was obtained.The prepared high-silica glass powder could be used as a catalyst carrier or adsorbent,or be re-melted to form high-silica glass as the ideal substitute for quartz glass due to its novel properties of thermal stability and excellent light transmission.Therefore,this work resulted in development of a practical and economical process for detoxification and recycling of waste lead-containing glass.

关 键 词：电子废弃物 含铅玻璃 碳热还原 玻璃分相 高硅氧玻璃 

分 类 号：X705[环境科学与工程—环境工程]