No.8（2005）8.Glass-ceramics for construction materials synthesized from municipal incinerator residue

Minoru TANAKA, Shigeru SUZUKI, Toshitada IMAI and Takumi KANEKO

Increasing the accumulation of municipal incinerator residue (hereafter called MIR) has become a serious social problem in view of environmental loading,and its reuse or recycling as a starting material for ceramics products is urgently required. Since the glass-ceramics of the CaO-Al₂O₃-SiO₂ system have been considered as be promising for use as construction materials,the preparation technique of this glass-ceramics from MIR have been investigated by the bulk crystallization method.

Glass batches were prepared by mixing the various mass ratios in order to get the composition; MIR: SiO: CaCO₃: FeS: Na₂SO₄ = 100: 10-30: 10-30: 3-5: 0-5. Glass samples were produced by melting the batches at 1450℃, and were reheated at 800℃ for 1 h. Further, the glasses were reheated at 1100℃ for 2 h, to transform them into glass-ceramics. The results of video microscope 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 and Wollastonite by the bulk crystallization,accompanied by a small quantity of Gehlenite and/or Nepheline.

Keywords

Glass-ceramics, Municipal incinerator residue, Construction materials, CaO-Al₂O₃-SiO₂, Inorganic waste

Back to Contents