REMOVAL OF LEAD FROM LEAD GLASS CUT REFUSE

摘要

PURPOSE:To remove lead from the cut refuse of lead glass by melting and separating the cut refuse of lead glass so as not to elute a lead component in order to prevent environmental pollution. CONSTITUTION:An Na2O component is added to the cut refuse of lead glass to adjust the SiO2/Na2O wt. ratio in lead glass to 1.2-3.0 and, further, a carbon source such as coke or charcoal is mixed with the cut refuse as a reducing agent and the resulting mixture is heated and melted at 800 deg.C or higher in a two-phase or three-phase Heroult electric furnace to separate lead in the cut refuse of lead glass. This method is accepted by both of Japanese and American standards of a Pb elution test and effective for avoiding environmental pollution accompanied by the elution of lead.