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Metals 2017, 7(9), 341; doi:10.3390/met7090341

Definition of a First Process Window for Purification of Aluminum via “Cooled Finger” Crystallization Technique

IME Institute of Process Metallurgy and Metal Recycling, RWTH Aachen University, 52056 Aachen, Germany
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Received: 25 July 2017 / Revised: 25 August 2017 / Accepted: 29 August 2017 / Published: 1 September 2017
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Abstract

Aluminum ultra-purification is commonly realized through a combination of three-layer electrolytic refining and fractional crystallization, mostly using zone melting. In order to achieve a purity over 6N with the aid of zone melting, many passes have to be performed, taking several days to be accomplished. This paper focuses on a fractional crystallization methodology using a rotating and internally gas cooled crystallizer (“cooled finger”), based on a Japanese patent from the 1980s, about which no scientific investigation or publication has yet been found. This paper focuses on the impact of process conditions (mainly cooling gas flow and rotation velocity) on the growth rate of the crystallized material as well as on the reduction factor of the impurities Fe, Si, Pb, and Zn in aluminum in relationship to their initial concentration and their interaction in a multi-component system. This technique can be considered as a promising alternative for purification of aluminum as well as other metallic systems. View Full-Text
Keywords: high purity; aluminum; fractional crystallization; cooled finger; purification high purity; aluminum; fractional crystallization; cooled finger; purification
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Curtolo, D.C.; Friedrich, S.; Bellin, D.; Nayak, G.S.; Friedrich, B. Definition of a First Process Window for Purification of Aluminum via “Cooled Finger” Crystallization Technique. Metals 2017, 7, 341.

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