zone refining


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zone melting

or zone refining
n.
A purification technique for crystalline substances in which a heating system passes slowly over a bar of the material to be refined, creating a molten region that carries impurities with it across the bar.

zone refining

n
(Chemical Engineering) a technique for producing solids of extreme purity, esp for use in semiconductors. The material, in the form of a bar, is melted in one small region that is passed along the solid. Impurities concentrate in the melt and are moved to the end of the bar
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References in periodicals archive ?
Tenders are invited for induction zone refining system
The American chemist William Gardner Pfann introduced the technique of zone refining in 1952.