Preparation of high silica glass powder by cathode ray tube funnel glass

Abstract：Cathode ray tube (CRT) funnel glass is a typical hazardous waste which contains plenty of heavy metal oxides such as PbO, BaO, SrO, Al₂O₃, etc.It needs to be safely disposed of.A method of strengthening glass phase separation by carbothermal reduction was adopted to preapre high silica glass powder without heavy metal from CRT funnel glass.When the treatment temperature was 1000℃, adding amount of B₂O₃was 20% and holding time was 30 minutes, the acid leaching removal efficiencies of Pb, Ba and Sr in CRT tunncel glass were 99.81%, 95.72% and 100.00%, respectively, and the removal efficiencies of other metals such as Na, K, Ca, Al were 80.19%, 99.92%, 99.39% and 78.56%, respectively.The quality fraction of SiO₂in the residue of the acid leaching was about 93%.Therefore, this study provided a new way for the resource utilization of heavy metal glass.

Keyword：cathode ray tube funnel glass;heavy metal;high silica glass;