Explain electro-refining of blister copper:

Explain electro-refining of blister copper: 
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1. It is carried out in the large lead lined tank. 2. Impure Copper is placed into large plates which are suspended into tank at intervals & acts as anode. 3. Cathodes are thin plates of pure copper & each is suspended between two plates of anode. 4. The electrolyte is 15% CuSO4containing 5-10% free H2SO4 solution. 5. By the passage of electric current, Cu from the anode with traces of more active metals like Zn, Fe, Ni present as impurities go into the solution as metallic ions, whereas less active metals like Ag, Au &Pt are not ionized but crumbles down from the anodes & settle below the anode as anode mud. 6. At the applied voltage, Cu++ ions alone are discharged at the cathode & thus pure copper is deposited on the cathodes. 7. Electro – refined copper is about 99.99% pure.

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