Process for reprocessing by-products of the metallurgical industry.

摘要

The process applies to the treatment of metallurgical by-products, these by-products containing at least one compound of a metal from the group formed by Zn, Ni, Cu, Cd, Co, Mn, with a view to recovering said metal . According to this process, an ammoniacal attack of said by-products is carried out to dissolve said compound and complex said metal. The ammoniacal attack is carried out by an ammoniacal buffer solution, then a separation of the undissolved residues and of the solution containing the said complexed metal is carried out, and then the ammonia is desorbed from the solution by sweeping by a flow. air, so as to precipitate said metal in the form of hydroxide. BR/ The invention applies in particular to the treatment of dust from electric steelworks, with or without prior reduction, or electrogalvanizing sludge.