Preparing ultra-thin glass from waste glass containing impurities of household waste by the combined technology of in-situ deposition and vacuum pyrolysis

Abstract

The resource utilization of waste glass is mainly divided into two aspects: adding waste glass as a raw material to the production of new glass, and employing it as building materials. Obviously, the resource utilization of waste glass is still in a low value-added stage, which leads to a low recovery rate of waste glass. Thus, how to achieve high value-added utilization of waste glass is a challenging issue. In this study, a combined technology of in-situ deposition and vacuum pyrolysis was proposed to synchronously realize impurities removal of waste glass with residual sauce and prepare high value-added ultra-thin glass. The impurities on waste glass were decomposed into harmless gas like CO2 (52.99%) and H2O (33.34%). Molecular dynamics results showed that impurities were completely decomposed at 1108°C. Abundant small molecules such as CO, H•, OH•, O• were produced, which were the precursors of forming CO2 and H2O. Meanwhile, ultra-thin glass (0.26 mm) was generated by in-situ deposition of waste glass. The prepared ultra-thin glass had uniform element distribution, smooth surface, and no structural defects. Visible light transmittance, dielectric constant and dielectric loss of the ultra-thin glass were 84.85%, 6.79 (1 MHz) and 0.0001-0.04, respectively. It presented excellent photoelectric properties, which had great application potential in the fields of photovoltaic and panel display. This study blazes a new trail for preparing high value-added ultra-thin glass from waste glass containing impurities.