PROCESS FOR THE DECONTAMINATION OF LANDS POLLUTED BY METALS

摘要

The invention relates to a hydrometallurgical process for decontaminating polluted soil (1) with metallic elements comprising a basic leaching step (I) so as to cause the dissolution of the metallic elements to be eliminated, a cementing step (II) causing precipitation. (6) of said elements in the form of metal, carried out by electrochemical exchange with a zinc powder (5) produced by an electrolysis step (III) of the solution (7) resulting from the cementation step (II). In accordance with the invention, an additional supply of zinc is made, preferably at the end of the leaching stage in the form of a leachate (17) from steel waste, in particular dust (13) from an electrical steelworks ( 15).