Question

What is the principle of zone refining?

Answer 1

It is based on the principle that when an impure metal in a molten state is allowed to cool, only the metal crystallizes while the impurities remain present in the molten state (mass) or melt. The impure metal converted into a rod which is heated at one end with a circular heater. A narrow zone of metal is melted.

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Answer 2

Answer:-

Zone Refining :-

It is based on the principal that impurities are more soluble in the melt than in the solid state of the metal . The impure metal is heated with the help of circular heaters at one end of the rod of impure metal. The molten zone is moved forward along with impurities and reaches the others end and is

discarded . Pure metal crystallises out of the melt.

The process is repeated several times

and heater is moved in the same direction. It is used for purifying semiconductors like B, Ge, Si, Ga and In.

_________OR_________

This is used for refining of elements like Si ,Ge and Te which are used as semiconductors .This process is based upon the principal that the impurities always lower the melting point of a substance . In this method, a zone of the rod of impure metal is melted with the help of circular heater in an atmosphere of inert gas. The molten substance is made to move longitudinally through the Central part of the rod by slowly moving the heater. As the heater moves along , pure metal solidifies while the impurities are carried away to the other end of the rod , which is cut off and pure metal is left.

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