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- W3133600648 abstract "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 of the decomposed phases as Pb 2+ ion. In this study, the mechanism of a unique phenomenon is investigated, involving spontaneous precipitation of metallic lead when PbO-containing glass is subjected to a hydrothermal water environment in a stainless-steel container. The roles of the hydrothermal environment and container materials on the metallic lead precipitation were investigated. The synthesized PbO-containing glass was placed in a container made of stainless steel or pure iron and set in a sealed autoclave with water, which was held at 613 K to provide the hydrothermal conditions. As a result, metallic lead droplets precipitated either on the surface of the glass or the container, whereas an iron oxide (Fe 3 O 4 ) phase was detected on the surface of the container. Conversely, no metallic lead was observed when the glass and stainless-steel container were heated in dry air. The above results indicate that a hydrothermal environment is necessary for metallic lead precipitation because subcritical water or steam leaches Pb 2+ from the glass. In addition, a redox reaction was suggested between the Pb 2+ ions transported to the surface of the container and metallic iron in the container to explain metallic lead droplets precipitation." @default.
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- W3133600648 date "2021-03-04" @default.
- W3133600648 modified "2023-09-27" @default.
- W3133600648 title "Lead extraction as metallic phase from waste lead oxide-containing glass by redox reaction in hydrothermal treatment" @default.
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- W3133600648 doi "https://doi.org/10.1007/s42452-021-04429-3" @default.
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