Examination of two glass compositions for the vitrification of toxic products from waste incineration

Due to the new Closed Substance Cycle and Waste Management Act the topic of waste incineration has become more important. Thermal treatment of non-rec yclable waste is a substantial part of this waste management. There is a po ssibility that the vitrification of the waste may provide the means by whic h the final product can be safely disposed of The vitrification process beg ins with the combination of glassformers and the residues of the thermal tr eatment. In an earlier work the raw materials vitrification and results of different corrosion tests were presented. The objective of this paper is to describe the formation and growth of surface layers on model glasses in le aching solutions according to MCC-IP leach test method. Varying parameters in the test method are glass composition, temperature, time and leaching so lution. After each leaching period the glass surface and formed leaching la yers of the samples were characterised via Fourier transformed infrared spe ctroscopy (FT-IR; in diffusive reflection), emanation thermal analysis (ETA ), weight loss and examination of the leaching solutions. Statements on the formation conditions, their dependence on the test parameters and influenc e of the transformed layers on the ongoing leaching of the glass are carrie d out.