Answer:
In this method a circular mobile
heater is fixed at one end of a rod of impure metal. The molten zone moves
along with heater which is moved forward. The pure metal crystallizes out of
melt and the impurities passed on into the adjacent molten zone. At the end
impurity zone is cut off.
This method is
based on the principle that impurities are more soluble in the melt than in the
solid state of the metal.
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