日本金属学会誌

J. Japan Inst. Metals, Vol. 21, No. 4 (1957),
pp. 241-245

Purification of Zinc by Zone Refining

Masuji Kyotani


Abstract:

The present paper deals with the experimental results on the zone refining of zinc. Study was made of the room temperature recrystallization characteristics and of the impurity substructure of zone-melted zinc. The results obtained were as follows: Spectrographic analyses were made, and they showed clearly that three of the main four impurities—lead, cadmium, copper and iron— have been reduced in concentration, that is, lead and cadmium were segregated at the finishing end and copper were segregated at the starting end of the ingot. Therefore, a portion of very high purity was found in the midsection of the ingot. The impurity substructure has been observed at the end portion of zone-melted bar, and the length of the portion of the impurity substructure was changed by the number of the passages of molten zones. The recrystallization of 20 pct cold-reduced molten bar was found to be complete in the entire midsection of the ingot in as little as 1/2 hr at room temperature, but in both the end portions, the recrystallization was found to remain imcomplete or did not occur of all at room temperature.


(Received 1956/11/20)

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