zone melting

zone-melting的词性：
n.（名词）

1. 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.Also called zone refining
区域熔融：结晶物质的一种净化技术，对一条待净化的原料慢慢加热，形成的熔化区域可从原料带走杂质也作 zone refining