Solidification of Waste Glass Powder with Utilizable Functionality by Hydrothermal Hot pressing for recycling

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In the present recycling process of waste glass, the waste glass are triturated to make glass cullet, which are useful as glass bottle raw materials, and then are recycled. Recently, the glass cullet utilization ratio has increased to about 80% because local communities have made positive efforts to fractional recovery. However, there is about 400,000 tons of unused glass cullet a year, and another serious problem is the handling of ultrafine glass powder that are yielded as residual-products by the trituration of the waste glass. For the above reasons, it is necessary to think up other ways to use the glass cullet and the glass powder besides glass bottle raw materials.In this research, we have been studying with a goal of producing artificial rocks, which are available as building materials, from the glass cullet or the glass powder by application of hydrothermal hot pressing. Hydrothermal hot pressing readily produces a sintered material at low temperature (below 300℃), so the methods is possible at reduced cost and environmentally-friendly.We investigated the velocity of hydration and the crystallization behavior in a piece of broken glass that was treated by hydrothermal hot pressing process. The morphology of the affected layer on the surface of the products was analyzed by SEM, XRD, IR, and etc. Then, we had basal knowledge for solidification of the waste glass powder under hydrothermal conditions. Furthermore, the same analysis of the products from the glass powder also gave us another basal knowledge about the reactivity difference between in the glass cullet and in the glass powder. When the sintering technology at low temperature by hydrothermal hot pressing was applied to the waste glass powder, the solidified substances with the very high tensile strength were able to be produced.