wht actually happens in zone refining?

Zone Refining

  • Principle − Impurities are more soluble in the molten state of metal (the melt) than in the solid state.

  • In this process, a circular heater is fixed at one end of a rod of impure metal.

  • As the heater moves, the molten zone of the rod also moves along with it.

  • As a result, pure metal crystallises out of the melt, and the impurities pass to the adjacent molten zone.

  • This process is repeated several times, which leads to the segregation of impurities at one end of the rod. Then, the end with the impurities is cut off.

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