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Betts electrolytic process
Additional recommended knowledge
Process description for lead
The electrolyte for this process is a mixture of lead fluorosilicate (PbSiF6) and hydrofluorosilicic acid (H2SiF6) heated to 45°C. Cathodes are thin sheets of pure lead and anodes are cast from the impure lead to be purified. A potential of 0.5 volts is applied. At the anode, lead goes into solution, as do metal impurities that are less noble than lead. Impurities that are more noble than lead, such as silver, gold, and bismuth, flake from the anode as it dissolves and settle to the bottom of the vessel as "anode mud." Pure metallic lead plates onto the cathode, with the less noble metals remaining in solution. Because of the high cost of electrolysis, this process is used only when very pure lead is needed. Otherwise the Parkes process followed by the Betterton-Kroll process are used to purify lead.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Betts_electrolytic_process". A list of authors is available in Wikipedia.|