Patent ID: 7651676

Claim:
A process for treating aluminium dross residues comprising: leaching aluminium dross residues with HCl so as to convert a portion of the Al atoms contained in said aluminium dross residues into aluminium chloride solubilized in a liquid and to obtain a mixture comprising a solid and said liquid, and separating said liquid from said solid; leaching said solid with H 2 SO 4 so as to convert a portion of the Al atoms contained in said solid into aluminium sulphates and to obtain a mixture comprising another solid containing aluminium sulphates and another liquid, and separating said another solid from said another liquid; solubilizing in water at least a portion of said aluminium sulphates contained in said another solid so as to obtain a leachate; and hydrochlorinating said liquid and said leachate, thereby forming a precipitate comprising aluminium chloride.