The anode is made of coarse or semi refined lead, the cathode is made of pure lead, and the electrolyte is composed of silicofluoric acid and lead silicofluoric acid.
Anode: Lead is oxidized into lead ions and enters the solution: Pb-2e=Pb2+;
Cathode: Lead ions in the solution are reduced to metal lead and precipitated: Pb2++2e=Pb.
During the electrolysis process, impurities such as iron, zinc, tin, nickel, diamond, and other metals with a lower standard electrode potential than lead dissolve into the solution together; Metals with standard electrode potentials corrected for lead, such as antimony, arsenic, pound, copper, tin, gold, and silver, do not dissolve and form anode slime, which adheres to the anode surface.
Electrolysis is the process of causing oxidation-reduction reactions on the cathode and anode by passing current through an electrolyte solution or molten electrolyte (also known as electrolyte). Electrochemical cells can undergo electrolysis under an applied DC voltage. The process of chemical changes caused by the passage of an electric current through a substance.