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Article

Numerical and Experimental Investigation of Germanium Refining via Fractional Crystallization Based Innovative Rotary Cooling Device

1
IME Institute for Process Metallurgy and Metal Recycling—RWTH Aachen University, Intzestr. 3, 52056 Aachen, Germany
2
VB-tec GmbH, Broicher Str. 227c, 52146 Wuerselen, Germany
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
This author is the Principal Investigator.
Metals 2020, 10(7), 973; https://doi.org/10.3390/met10070973
Received: 17 June 2020 / Revised: 14 July 2020 / Accepted: 16 July 2020 / Published: 18 July 2020
(This article belongs to the Special Issue 10th Anniversary of Metals: Metallurgy and Metal Technology)
This paper focuses on the principle study and application of a fractional crystallization methodology using a rotating and internally gas cooled crystallizer (so called cooled finger, developed at IME/RWTH Aachen) first applied to the refining of germanium. For this purpose, a series of experimental trials were performed using a model metal—Aluminum—to gather the temperature profile needed for the numerical simulation that provides an initial process window used for the purification of germanium in a vacuum resistance furnace. The results of the simulation showed good agreement with the experimental results and the conducted trials based on that process window enabled the single step purification of germanium from an initial purity of 98.8% up to 99.9%. View Full-Text
Keywords: Germanium; cooled finger; fractional crystallization; CrysVUn; modelling; refining; purification; recycling Germanium; cooled finger; fractional crystallization; CrysVUn; modelling; refining; purification; recycling
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MDPI and ACS Style

Curtolo, D.C.; Friedrich, S.; Noack, M.; Friedrich, B. Numerical and Experimental Investigation of Germanium Refining via Fractional Crystallization Based Innovative Rotary Cooling Device. Metals 2020, 10, 973. https://doi.org/10.3390/met10070973

AMA Style

Curtolo DC, Friedrich S, Noack M, Friedrich B. Numerical and Experimental Investigation of Germanium Refining via Fractional Crystallization Based Innovative Rotary Cooling Device. Metals. 2020; 10(7):973. https://doi.org/10.3390/met10070973

Chicago/Turabian Style

Curtolo, Danilo C., Semiramis Friedrich, Michael Noack, and Bernd Friedrich. 2020. "Numerical and Experimental Investigation of Germanium Refining via Fractional Crystallization Based Innovative Rotary Cooling Device" Metals 10, no. 7: 973. https://doi.org/10.3390/met10070973

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