Abstract
Ceramic materials were obtained from mixtures of aluminium sludge and slate powder (with different Al2O3:SiO2 molar proportions), which were dried, shaped by uniaxial pressing and sintered at temperatures in the range of 950 to 1300 oC, in order both to detoxify the sludge by fixing the metals in a leach-resistant ceramic matrix and to yield a new material from the reactions of the above compounds at high temperature. The most promising material was obtained from the 2:1 mixture sintered at 1300 oC, which was also found to be inert after leaching tests. The average Vickers hardness HV3 (683), bend strength (126 MPa),Young’s modulus (161GPa) and fracture toughness (3.35 MPa.m1/2) are significantly higher than those found for the as sintered slate powders, which is attributed to the increased fraction of a-alumina and reduced content of glassy phase in the microstructure of the material due to the sludge addition.| Only available as a scanned copy |
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