Experimental impurity segregation and numerical analysis based on variable solute distribution coefficients during multi-pass zone refining of aluminum

Cheung, Noé; Bertazzoli, Rodnei; Garcia, Amauri

doi:10.1016/j.jcrysgro.2008.01.007

Cited by 28 publications

(17 citation statements)

References 14 publications

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“…Comparing the two model simulations with constant-and variable k for aluminium refinement, it can be concluded that using variable k in the simulation is much closer to the experimental impurity distribution profiles than the taking a constant k into account. The concentration profiles after refinement predicted by them differ from each other by two orders of magnitude in zone refining of Al with eight zone passes, and the efficiency of purification is strongly underestimated when a constant value for k is considered in simulations, which can be easily seen in Figure 11(c) [30].…”

Section: Iterative Modeling With Variable Kmentioning

confidence: 90%

“…However, using the same simulation model, Cheung, et al [30] researched on the effects of variable k instead of constant k on the efficiency of simulations with a combination of theoretical and experimental analysis. The variable k is attained from a phase diagram database containing the variation of liquidus and solidus line slopes built according to the corresponding phase diagram, as shown in Figure 11(a).…”

Section: Iterative Modeling With Variable Kmentioning

confidence: 99%

“…A new numerical simulation model has been proposed by Nakamura, et al [23] on the basis of the Equations ( (10) and (11) [30].…”

Section: Iterative Modeling Considering Diffusion Regionmentioning

confidence: 99%

See 2 more Smart Citations

Production of High Purity Metals: A Review on Zone Refining Process

Zhang¹,

Friedrich²,

Friedrich³

2018

JCPT

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Purification is a primary application of zone melting, in which the improvement of efficiency, production yield and minimum achievable impurity level are always the research focus due to the increasing demand for high purity metals. This paper has systematically outlined the whole development of related research on zone refining of metals including basic theories, variants of zone refining, parametric optimization, numerical models, and high purity analytical methods. The collection of this information could be of good value to improve the refining efficiency and the production of high purity metals by zone refining.

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Section: Iterative Modeling With Variable Kmentioning

confidence: 90%

Section: Iterative Modeling With Variable Kmentioning

confidence: 99%

See 1 more Smart Citation

Production of High Purity Metals: A Review on Zone Refining Process

Zhang¹,

Friedrich²,

Friedrich³

2018

JCPT

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“…Finally, when k is close to 1, quite no purification can be achieved by fractional crystallization [20] [21] [22].…”

Section: Methodologies Of Germanium Purification and Their Principlesmentioning

confidence: 99%

“…A more realistic approach can be evaluated through the effective distribution coefficient (k eff ), shown in Equation (5) and detailed described by Burton, Prim and Slichter in their article regarding the distribution coefficients of solute elements in Germanium [22] [23]…”

Section: Methodologies Of Germanium Purification and Their Principlesmentioning

confidence: 99%

High Purity Germanium, a Review on Principle Theories and Technical Production Methodologies

Curtolo¹,

Friedrich²,

Friedrich³

2017

JCPT

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Since the early 1950's the use of Germanium has been continuously growing as new applications are being developed. Its first commercial usage as the main material, from which the semiconductors were made, was later replaced by Silicon. The applications were then shifted to a key component in fiber optics, infrared night vision devices and space solar cells, as well as a polymerization catalyst for polyethylene terephthalate (PET). With the advance development in new technologies, the attentions have been brought back to Germanium due to its excellent semiconductor properties. New applications on the field of high efficiency solar cells, SiGe based chips, LED technologies, etc., are being developed and show a great potential. According to DERA (Deutsche Rohstoffagentur/German Mineral Resources Agency), the demand for Ge will grow considerably by 2030, pushed mostly by the increase in the fiber optics market and advanced materials sector [1]. Therefore, this paper focuses on an overview of the production chain of Germanium, especially from its concentrate up to the single crystal growth of its valuable ultra-pure metallic form to be used in high technological applications.

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Purification process of phosphoric acid by vertical zone‐melting technique

Ren

Duan

2012

Can J Chem Eng

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The efficiency of vertical zone-melting technique as a function of molten-zone length, number of zone passes, molten-zone velocity and phosphoric acid concentration on the purification process of phosphoric acid is studied. The results showed that adopting a relatively long molten-zone length in the initial passes to effect a rapid movement of impurities and a short molten-zone length in the later passes to obtain greater purification; additional zone-passes cannot be made as impurities redistribution approaches limiting distribution; for stirring mechanism is not adopted in the present study and as diffusion is the only mixing process, slow molten-zone velocity 3-6 mm h −1 is better; the purification efficiency increases with phosphoric acid concentration, and 94-99.8% concentration of phosphoric acid is better.

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Experimental impurity segregation and numerical analysis based on variable solute distribution coefficients during multi-pass zone refining of aluminum

Cited by 28 publications

References 14 publications

Production of High Purity Metals: A Review on Zone Refining Process

Production of High Purity Metals: A Review on Zone Refining Process

High Purity Germanium, a Review on Principle Theories and Technical Production Methodologies

Purification process of phosphoric acid by vertical zone‐melting technique

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