The preparation of porous ceramic material from aluminum waste dross

The recycling possibility of aluminum waste dross(AWD) as a ceramic raw material of porous. light-weight material was examined. The aluminum waste dross was washed 4-7 consecutive times and roasted at 900 degrees C for hour as pre-treatments. The properties of the pre-treatment of aluminum, waste dross were also investigated. It was confirmed by XRD result that the spinel crystalline was grown in AWD, after roasting. After the roasted AWD was ground in aqueous state, the sodium hexaphosphate(SHP) as a dispersant which is used for stabilizing the concentrated slurry was added to the AWD slurry. The porous material was prepared by slurry foaming method with surfactant at room temperature. The foamed slurry volumes were 2 and 3 times of the original slurry volume. The properties of porous material with extended volume of 3 times was following: the porosity was about 84%, bulk density was 0.59g/cm(3), the range of pore was from 50 mu m to 500 mu m and mean pore size was about 200 mu m. AWD porous material was sintered at 1150 degrees C - 1250 degrees C. It was concluded that AWD was sintered well at 1200 and 1250 degrees C from material surface observation by SEM.