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Thermodynamic Analysis for the Refining Ability of Salt Flux for Aluminum Recycling

The removability of impurities during the aluminum remelting process by oxidation was previously investigated by our research group. In the present work, alternative impurity removal with chlorination has been evaluated by thermodynamic analysis. For 43 different elements, equilibrium distribution r...

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Autores principales: Hiraki, Takehito, Miki, Takahiro, Nakajima, Kenichi, Matsubae, Kazuyo, Nakamura, Shinichiro, Nagasaka, Tetsuya
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456205/
https://www.ncbi.nlm.nih.gov/pubmed/28788144
http://dx.doi.org/10.3390/ma7085543
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author Hiraki, Takehito
Miki, Takahiro
Nakajima, Kenichi
Matsubae, Kazuyo
Nakamura, Shinichiro
Nagasaka, Tetsuya
author_facet Hiraki, Takehito
Miki, Takahiro
Nakajima, Kenichi
Matsubae, Kazuyo
Nakamura, Shinichiro
Nagasaka, Tetsuya
author_sort Hiraki, Takehito
collection PubMed
description The removability of impurities during the aluminum remelting process by oxidation was previously investigated by our research group. In the present work, alternative impurity removal with chlorination has been evaluated by thermodynamic analysis. For 43 different elements, equilibrium distribution ratios among metal, chloride flux and oxide slag phases in the aluminum remelting process were calculated by assuming the binary systems of aluminum and an impurity element. It was found that the removability of impurities isn’t significantly affected by process parameters such as chloride partial pressure, temperature and flux composition. It was shown that Ho, Dy, Li, La, Mg, Gd, Ce, Yb, Ca and Sr can be potentially eliminated into flux by chlorination from the remelted aluminum. Chlorination and oxidation are not effective to remove other impurities from the melting aluminum, due to the limited parameters which can be controlled during the remelting process. It follows that a proper management of aluminum scrap such as sorting based on the composition of the products is important for sustainable aluminum recycling.
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spelling pubmed-54562052017-07-28 Thermodynamic Analysis for the Refining Ability of Salt Flux for Aluminum Recycling Hiraki, Takehito Miki, Takahiro Nakajima, Kenichi Matsubae, Kazuyo Nakamura, Shinichiro Nagasaka, Tetsuya Materials (Basel) Addendum The removability of impurities during the aluminum remelting process by oxidation was previously investigated by our research group. In the present work, alternative impurity removal with chlorination has been evaluated by thermodynamic analysis. For 43 different elements, equilibrium distribution ratios among metal, chloride flux and oxide slag phases in the aluminum remelting process were calculated by assuming the binary systems of aluminum and an impurity element. It was found that the removability of impurities isn’t significantly affected by process parameters such as chloride partial pressure, temperature and flux composition. It was shown that Ho, Dy, Li, La, Mg, Gd, Ce, Yb, Ca and Sr can be potentially eliminated into flux by chlorination from the remelted aluminum. Chlorination and oxidation are not effective to remove other impurities from the melting aluminum, due to the limited parameters which can be controlled during the remelting process. It follows that a proper management of aluminum scrap such as sorting based on the composition of the products is important for sustainable aluminum recycling. MDPI 2014-07-30 /pmc/articles/PMC5456205/ /pubmed/28788144 http://dx.doi.org/10.3390/ma7085543 Text en © 2014 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Addendum
Hiraki, Takehito
Miki, Takahiro
Nakajima, Kenichi
Matsubae, Kazuyo
Nakamura, Shinichiro
Nagasaka, Tetsuya
Thermodynamic Analysis for the Refining Ability of Salt Flux for Aluminum Recycling
title Thermodynamic Analysis for the Refining Ability of Salt Flux for Aluminum Recycling
title_full Thermodynamic Analysis for the Refining Ability of Salt Flux for Aluminum Recycling
title_fullStr Thermodynamic Analysis for the Refining Ability of Salt Flux for Aluminum Recycling
title_full_unstemmed Thermodynamic Analysis for the Refining Ability of Salt Flux for Aluminum Recycling
title_short Thermodynamic Analysis for the Refining Ability of Salt Flux for Aluminum Recycling
title_sort thermodynamic analysis for the refining ability of salt flux for aluminum recycling
topic Addendum
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456205/
https://www.ncbi.nlm.nih.gov/pubmed/28788144
http://dx.doi.org/10.3390/ma7085543
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