Lead extraction as metallic phase from waste lead oxide-containing glass by redox reaction in hydrothermal treatment

Abstract A new low-energy and eco-friendly method for extracting lead from waste PbO-containing funnel glass is required. Conventional methods use either energy intensive smelting reduction at temperatures higher than 1273 K or involve phase separation of the glass, requiring an acid treatment to extract elemental Pb partitioned in one decomposed phases as 2+ ion. In this study, mechanism a unique phenomenon investigated, involving spontaneous precipitation metallic when subjected hydrothermal water environment stainless-steel container. The roles container materials on were investigated. synthesized was placed made stainless steel pure iron set sealed autoclave with water, which held 613 provide conditions. As result, droplets precipitated surface container, whereas oxide (Fe 3 O 4 ) detected Conversely, no observed heated dry air. above results indicate that necessary because subcritical steam leaches glass. addition, redox reaction suggested between ions transported explain precipitation.