The powder mixtures of Talc-Kaolinite-Alumina-Basalt-Quartz were mechanically activated in a planetary ball mill for 1 hour. The structural alterations and thermal behaviour of the powder mixture were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermal analysis (TG-DTA). The results showed that the mechanical activation led to amorphisation and decreased the temperature of cordierite formation.
This work describes the studies to reuse secondary aluminium production waste (SAPW) derived from aluminium casting processes in the fabrication of mullite-based refractory ceramics. SAPW was characterized by using particle size analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF). Secondary aluminium production waste (SAPW), quartz and Grolleg kaolin were mixed stoichiometrically, according to chemical formula of mullite (3Al₂O₃·2SiO₂) by ball milling. Cylindrical samples were consolidated by uniaxial dry pressing and sintered at different temperatures (up to 1350°C). The phase and microstructural evolution, water absorption, bulk density, mechanical properties of sintered samples were investigated and refractory ceramics based on mullite were obtained.
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