都市ゴミ焼却灰を用いた建材用結晶化ガラス

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Increasing accumulation of municipal incinerator residue (hereafter called MIR) have been becoming a serious social problem in view of environmental loading, and its reuse or recycling as starting materials of ceramics products is urgently required. Since the glass-ceramics of the CaO-Al_2O_3-SiO_2 system have been promising as construction materials, we have investigated the preparation technique of this glass-ceramics from MIR by the bulk crystallization method. The structures of glass-ceramics were investigated by means of video microscope (VMS), scanning electron microscope (SEM), powder X-ray diffraction (XRD), and so on. Batches were prepared by mixing the various weight ratios in order to get the composition; MIR:SiO_2:CaCO_3:FeS:Na_2SO_4=100:10-30:10-30:3-5:0-5. Glass samples were produced by melting the batches at 1450℃. From those batch compositions, the homogenous glasses were produced. They were reheated at 800℃ for 1 h to induce nucleation in the glasses. Further, the glasses were reheated at 1100℃ for 2 h, to make them transform into glass-ceramics. The results of VMS photographs, SEM photographs and powder XRD patterns of the obtained glass-ceramics showed the homogeneous precipitations of the prismatic crystals (about 0.5×2μm) of Anorthite (CaO・Al_2O_3・2SiO_2) and Wollastonite (CaO・SiO_2) by the bulk crystallization, accompanied by a small quantity of Gehlenite (2CaO・Al_2O_3・SiO_2) and/or Nepheline (NaO_2・Al_2O_3・2SiO_2).
社団法人日本セラミックス協会の論文
2005-09-01

都市ゴミ焼却灰を用いた建材用結晶化ガラス

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