Dictionary

zone refining

noun

Definition of ZONE REFINING

:  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
zone–refined adjective

First Known Use of ZONE REFINING

1952

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