河南理工大学学报（自然科学版）2024，Vol.43Issue(4)：96-102,110,8.DOI:10.16186/j.cnki.1673-9787.2022040047
玻璃分相联用机械化学法脱除废旧含铅玻璃中重金属铅
Removing heavy metal lead from waste leaded glass by phase separation in glass and mechanochemical method
摘要
Abstract
The traditional phase separation used hot acid leaching process to remove heavy metal lead from phase separation product of cathode ray tube(CRT)funnel glass.However,the acid leaching process con-sumed a large amount of strong acid,the waste acid cannot be reused and may cause acid pollution.Objec-tives In order to achieve green and efficient recovery of heavy metal lead from the phase separation product of CRT funnel glass,Methods ethylene diamine tetraacetic acid(EDTA) was selected as the extractant through mechanochemical method.By studying the migration and transformation laws of heavy metals in funnel glass during the rapid phase separation process and mechanical activation leaching process,the main factors and action mechanism affecting the removal rate of heavy metals were revealed. Results The results showed that during the phase separation process,Pb,K,Ca and other elements contained in the funnel glass were mainly enriched in the B2O3-rich phase with interconnected structure.During the subsequent wet ball milling extraction process,the B2O3-rich phase was rapidly dissolved into water under mechanical activation,meanwhile,metal cations contained in the B2O3-rich phase formed soluble complex with EDTA,and which can be removed from the phase separation product.The extraction rate of Pb,K,Ca and other metals increased with the increase of EDTA addition,ball milling speed and ball milling time,but it shows a trend of first increasing and then decreasing with the increase of water/solid ratio.When the EDTA addition amount was 80％,milling speed was 500 rpm,liquid-solid ratio was 0.8 and ball milling time was 30 min,and,the extraction rates of Pb,K,Ca,Al were 98.79％,94.92％,95.17％ and 65.71％,respectively,and high silica glass powder with silica purity exceeding 92％ was obtained. Conclusions This study provided reference and guidance for the green and high value-added utilization of heavy metal containing glass.关键词
CRT锥玻璃/玻璃分相/机械化学法/铅回收/EDTAKey words
CRT funnel glass/glass phase separation/mechanochemical method/lead recovery/EDTA分类
资源环境引用本文复制引用
邢明飞,吴小芳,刘元杰,赵丽..玻璃分相联用机械化学法脱除废旧含铅玻璃中重金属铅[J].河南理工大学学报（自然科学版）,2024,43(4):96-102,110,8.基金项目
国家自然科学基金资助项目(51508165) （51508165）
河南省重点研发与推广专项(科技攻关)项目(212102310061,212102310502) （科技攻关）
河南理工大学杰出青年基金资助项目(J2022-2) （J2022-2）
