Question

what is meant by refining of metals ? Name four methods used for refining of impure metals.​

Answer 1

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 2

Answer:

The most widely used method for the refining of impure metals obtained by various reduction processes is electrolytic refining method. Electrolytic refining is a process of purification by electrolysis. Several metals like copper, zinc, tin, lead, nickel, chromium, gold and silver are refined by this process.