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  Purification of Lead

Purification of Lead:

Lead extracted by the above technique contains impurities like silver, tin, bismuth, copper, gold and iron. It is refined by the processes described below.

a. Liquation:

The contaminated metal is heated on a sloping hearth. Lead melts and flows down the slope. The infusible impurities stay on the hearth.

b. Desilverisation:

Silver is eliminated by either Pattinson’s procedure or Park’s process.

c. Electrolytic refining:

Very pure lead is acquired by this procedure.

Anode – Impure lead
Cathode – Very pure lead
Electrolyte – Lead fluosilicate + Hydrofluosilicic Acid
                        (PbSiF6)                    (H2SiF6)

The metallic impurities that is more electropositive than lead, like iron and tin, and go into the solution as the rest of the impurities are thrown down as anode mud.

 

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