Zone refining is based on the principle of

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(B) Zone refining is a method used to obtain metals of high purity. It is based on the principle that the impurities are more soluble in the molten st

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fractional crystallisation

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(B) Zone refining is a method used to obtain metals of high purity. It is based on the principle that the impurities are more soluble in the molten state of the metal than in the solid state. As the heater moves,the pure metal crystallizes out of the melt,while the impurities pass into the adjacent molten zone,effectively concentrating them at one end of the rod.

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