PROCESS FOR IMMOBILISING TOXIC METALS IN SOLID INDUSTRIAL RESIDUES

摘要

The invention pertains to a process for immobilising toxic metals in industrial residues, such as fly ash, bottom ash and filter cake, wherein the residues are contacted with a phosphate and a cement. The cement is added to the solid residues in such an amount that a granular product is obtained. It is preferred that the industrial residues are simultaneously contacted with a phosphate, which has a solubility in water in the range from 0.01 to 5.0 g/100ml. The treated material can be used as an aggregate or can be compressed into a compacted building material.