Reuse of scrap picture tube glass as secondary raw material for glass fibre or filament prodn.

摘要

In the reprocessing of recycled and sorted picture tube scrap glass from television and computer monitors, the novelty is that scrap screen glass, cone glass and neck glass of the following compsns. are used as secondary raw materials for the prodn. of glass in fibre or filament form by melting. The screen glass has the compsn. 59.85-64.55% SiO2, 6.9-7.7% Na2O, 7.4-9.35% K2O, trace Li2O, 0-0.06% B2O3, 0.3-13.15% BaO, 0.9-4.0% CaO, 0.02-1.4% MgO, 0.5-10.45% SrO, 0-0.003% ZnO, 0.01-2.2% PbO, 2-4% Al2O3, 0.05-0.08% Fe2O3, 0.2-0.71% TiO2, 0-1.35% ZrO2, 0.35-0.45% Sb2O3, 0.0055-0.01% NiO, 0-0.002% CoO, 0% P2O5, 0-0.25% As2O3, 0.037-0.74% F<-> and 0.3% CeO2. The cone glass has the compsn. 51.1-60.15% SiO2, 5.4-6.55% Na2O, 8.7-9.85% K2O, trace to 0.5% Li2O, trace B2O3, 0.75-1.9% BaO, 2.1-5.95% CaO, 2.6-3.0% MgO, 0-0.2% SrO, 0-0.004% ZnO, 9.9-23.5% PbO, 1.55-4.5% Al2O3, 0.0033-0.09% Fe2O3, 0.031-0.074% TiO2, 0.017-0.025% ZrO2, 0.05-0.2% Sb2O3, trace to 0.003% NiO, 0-0.002% CoO, 0.2-0.55% P2O5, 0-0.03% As2O3, 0-0.03% F<-> and 0% CeO2. The neck glass has the compsn. 46.5-54.75% SiO2, 0.5-3.5% Na2O, 8.95-12.55% K2O, trace Li2O, trace B2O3, 0.025-0.09% BaO, 0.025-3.5% CaO, trace MgO, 0-7.2% SrO, trace ZnO, 28.5-34.0% PbO, 0.8-3.65% Al2O3, 0.04-0.08% Fe2O3, 0% TiO2, 0.05-0.065% ZrO2, 0.145-0.5% Sb2O3, 0% to trace NiO, 0% CoO, 0% P2O5, 0.0033-0.04% As2O3, 0.0029-0.01% F<-> and 0% CeO2. Also claimed is a product which contains glass fibres as described above and which is esp. intended for sound, heat and/or cold insulation or for material sepn., opt. in the form of a fibre-contg. combination material.