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Materials 2014, 7(8), 5543-5553; doi:10.3390/ma7085543

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

1
Graduate School of Engineering, Tohoku University, Sendai 980-8578, Japan
2
Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan
3
Graduate School of Economics, Waseda University, Tokyo 169-8050, Japan
*
Author to whom correspondence should be addressed.
Received: 15 June 2014 / Revised: 20 July 2014 / Accepted: 21 July 2014 / Published: 30 July 2014
(This article belongs to the Special Issue Recycled Materials)
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Abstract

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. View Full-Text
Keywords: recycling of aluminum; thermodynamic analysis; impurity removal; salt flux; refining ability recycling of aluminum; thermodynamic analysis; impurity removal; salt flux; refining ability
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Hiraki, T.; Miki, T.; Nakajima, K.; Matsubae, K.; Nakamura, S.; Nagasaka, T. Thermodynamic Analysis for the Refining Ability of Salt Flux for Aluminum Recycling. Materials 2014, 7, 5543-5553.

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