zone melting

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Related to Zone remelting: zone refining

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.
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For economically substantiated solution of the problem of as full as possible recovery of conditioned and off-grade wastes of refractory alloys, rejected, as one of the reasons, because of their chemical composition, the authors propose technology of two-stage remelting of refractory alloys with inclusion into the technological chain of developed at SE <<Zorya-Mashproekt>> jointly with PTIMA of so called method of directed zone remelting [5].
It was shown that significant increase (up to 90 % of the charge mass) of the off-grade waste utilization factor was achieved by development and testing of the technology of zone remelting of the refractory alloy waste in horizontal melting unit PMP-4 with application of original design of a multilevel ceramic mould, which allowed performing primary mechanical refining of the melt due to the inserted ceramic filter.