Patent ID: 8409421

Claim:
An electrolytic process for producing metallic lead starting from desulfurized lead pastel comprising: a) leaching the desulfurized pastel by putting it in contact with a solution comprising ammonium chloride, with the formation of a first leach liquor and development of gaseous CO 2 ; b) separating a first solid residue and a first clarified leach liquor from the first leach liquor; c) leaching the first solid residue by putting it in contact with a solution comprising ammonium chloride and hydrogen peroxide to obtain a second leach liquor; d) separating a second solid residue and a second clarified leach liquor from the second leach liquor; e) joining the first clarified leach liquor with the second clarified leach liquor and forming a single solution; f) subjecting the single solution to electrolysis in a flow cell, with a current density ranging from 50 to 10,000 A/m 2 , said electrolysis resulting in the formation of a lead sponge.