Question

explain zone refining process with an example

Answer 1

Answer:

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: a technique for the purification of a crystalline material and especially a metal in which a molten region travels through the material to be refined, picks up impurities at its advancing edge, and then allows the purified part to recrystallize at its opposite edge. — called also zone melting.

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Answer 2

Zone Refining Process-

• The basic principle that is used in the zone refining process is that the impurities present in metal are more soluble in its molten state rather than in its solid state.
• So, in this process a circular-shaped moving induction-coil heater is kept under one end of the impure metal which is placed under a tube filled with a noble gas.
• Then the heater is moved from one end of the rod to another which leads to the movement of the molten part of the metal which carries the soluble impurities along with it.
• This process is repeated numerous times till the impurities gather at one end of the metal rod.
• The impure part of the rod is then cut off and we are left with the pure metal rod.

For example-

This process can be used to purify the rods of metals like silicon and germanium.