A Novel Process Utilizing Subcritical Water to Remove Lead from Wasted Lead Silicate Glass

Lead was removed from lead silicate glass 7.3Na2O–6.4K2O–3.7MgO–5.4CaO–66.4SiO2–7.8PbO–3Al2O3 (mol %), used in color television CRT funnel, utilizing a subcritical hydrothermal treatment at 628 K and 24 MPa followed by acid leaching at 373 K. This process may be used to prevent disposal of lead containing waste glass wares to landfills, reduce environmental risks in future.