Electrometallurgy
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
P-375
2025-12-11
32
If a copper anode is used in the last demonstration, the SO4 will unite with it, forming CuSO4, keeping up the strength of the solution and eating away the copper. If a plate of impure copper is used as the anode, the copper deposited on the cathode will be pure, the impurities being left in the solution.
When lead ores are reduced to metallic lead in a furnace, there is usually with the lead a small quantity of silver. In order to obtain pure lead to be used in paints, the pig lead containing the silver is used as the anode, and a lead plate as cathode. When the current is sent through the bath, pure lead is transferred from the anode to the cathode, while the silver is left in the bath as a residue. The silver is afterwards recovered from the solution, and forms an important by-product.
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