Process for avoiding special heavy metal refuse during the decontamination of natural and technical sludges, thermal residues and soils

摘要

The invention relates to a process for the removal of heavy metal contamination from natural and industrial sludges, thermal residues and soils. The dissolved metal salts are precipitated as metal hydroxides in the pH range from 3.5 to 11. Precise control of the pH value permits the isolation of individual metals or metal fractions, which can be used as raw materials in the iron and steel industry.