explain zone refining and electrolytic reining process of purification of metals.
Answers
Answer:
In the process of zone refining, a circular mobile heater is fixed at one end of a rod of impure metal. ... (ii) Electrolytic refining; Electrolytic refining is the process of refining impure metals by using electricity. In this process, impure metal is made the anode and a strip of pure metal is made the cathode.
Zone refining process
Zone refining refers to the method of purifying a crystal wherein a thin region of the crystal undergoes melting. This ‘molten zone’ is now moved across the crystal.
Zone refining is a very useful method to get metals with very high purity such as silicon and germanium. It is also referred to as zone melting, floating zone process, and travelling melting zone.
Electrolytic refining process
Electrolytic refining is a technique that is used for the extraction and purification of metals that are obtained by refining methods. The impure metal is used as an anode and the pure metal is used a cathode. Soluble salt from the same metal is used an electrolyte.
When an electric current is passed, pure metal gets deposited at the cathode and the impure metal gets dissolved from the anode. Impurities from the metal gets collected below the anode and is known as anode mud.