define refining of a metal
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Answer:
In metallurgy, refining consists of purifying an impure metal. It is to be distinguished from other processes such as smelting and calcining in that those two involve a chemical change to the raw material, whereas in refining, the final material is usually identical chemically to the original one, only it is purer.
Answer:
Metals like Cu, Zn, Sn, Pb, Ag, Au are refined by electrolysis method. In an electrolytic cell, a block of impure metal is made into the anode, a thin strip of pure metal is made into a cathode and an electrolyte is made out of a suitable metal – salt of the metal to be refined. When an electric current is passed through the cell, ions from the anode enter the electrolyte. The same number of metal ions from the electrolyte gets deposited on the cathode. This is a preferential deposition. Impurities remain in the electrolyte. Some of the impurities may be deposited below the anode.
Explanation:
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