Abstract
The objective of this work is to evaluate the feasibility of using alum sludge, a by-product from potable water plants, as raw material for ceramic production.Thus, 10, 20 and 30 wt% of alum sludge were added to a clay used for the production of building materials. In order to increase the densification of the ceramic bodies, a silicate-based fluxing agent was also added.The clay and alum sludge were characterised by chemical and mineralogical composition and particle size distribution. Porosity, linear shrinkage, mechanical strength and leaching tests according to Brazilian standards were determined on the fired bodies which showed properties comparable to similar commercial products.The results indicated that the ceramic products are inert to leaching according to Brazilian environmental regulations, and present an interesting potential for recycling alum sludge as raw material for ceramic products.
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