In term of hazardous waste vitrification, its slag utilization has become a pivotal part of achieving cost reduction. This research has demonstrated the potential of preparing foam glass ceramics through sintering vitrification slag (VS) and biochar (C). It was inferred in TG-DSC analysis that the appropriate sintering temperature for preparing the foam glass ceramics from VS and C was estimated to be roughly 1000-1050 degrees C. The phase and structural transformation of the VS/C system during the sintering process showed that the C promoted the formations of aluminum oxide, grossular ferrian, and merwinite phase; however, the glassy phase still took a leading role. Synchronously, the crystalline phase forming may impact the pore construction. An excellent foam glass showing a dense glossy surface, an evenly distributed honeycomb structure inside, and outstanding integrated performance could be attained through sintering the VS with 2 wt.% C as well as 2 wt.% Na3P2O7 at 1050 degrees C for 60 min. The discoveries could offer an emerging way of employing the VS.
