Experimental study of the water binder anhydrite in the solidification/stabilization process of heavy metal sludges

摘要

An experimental study of the use of an industrial byproduct, anhydrite (CaSO_4), as inorganic binder in the solidification/stabilization (S/S) process of heavy metal sludges has been per- formed. The influence of the variables: binder: waste ratio, anhydrite particle size and water amount on the S/S process of a synthetic sludge containing Cd, Cr and Pb has been studied. Leaching of stabilized products using the Toxicity Characterization leaching Procedure was used To evaluate the behaviour of heavy metals after treatment with anhydrite.