A new, hydrothermal hot-pressing method for recycling waste glass has been studied. The traditional process for recycling waste glass is by melting and sintering. These processes are undertaken at high temperatures; over 1000 ℃ and 700-900 ℃ respectively, and at high financial cost. On the other hand, hydrothermal hot pressing (HHP) readily produces a sintered material (containing glass powder) at low temperature (e.g. 150-300 ℃; [1-7]). Thus, the production of new crystal material, by the solidification of waste glass powder, is now possible at reduced cost. The HHP technique is characterized by the mechanical compression of powdered material, under hydrothermal conditions. The densification process of glass powder, by HHP techniques, has been investigated [7-15].
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