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Preparation of Al-Ti Master Alloy by Electrochemical Recovery of Titanium-Reducing Slag in Molten Salts

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Abstract

An electrochemical method for the preparation of an Al-Ti master alloy in Al electrolysis melts of Na3AlF6-Al2O3-LiF at 980°C was investigated. The Ti-reducing slag (5.24 wt.% Ti in the Ti-reducing slag) was obtained from the aluminothermic reduction of Na2TiF6. The cold test (i.e., the aluminothermic reduction process without applying any voltages) result revealed the capability of the Al cathode to reduce the Ti slag, and the recovery rate could reach 45.8% at 980°C over 3.5 h with the addition of 10 wt.% Ti-reducing slag. In contrast, the recovery rate of Ti after electrolysis at 3.0 V could reach 99.2%. Thus, the electrochemical treatment for Ti-reducing slag is a cooperative process involving aluminothermic and electrochemical reduction reactions. Electrochemical analysis indicated that the Ti ions are reduced to metallic Ti according to Ti4+ → Ti3+ → Ti. An Al-Ti alloy layer could be prepared on the external surface of the Mo electrode after electrolysis with the addition of 12 wt.% Ti-reducing slag.

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Acknowledgements

This work was performed under the auspices of the National Natural Science Foundation of China (Grant No. 51304044).

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Authors and Affiliations

  1. Chongqing Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology (EBEAM), Yangtze Normal University, Chongqing, 408100, China

    Kun Zhao

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Kun Zhao, Yaowu Wang & Naixiang Feng

Authors
  1. Kun Zhao
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  2. Yaowu Wang
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  3. Naixiang Feng
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Correspondence to Kun Zhao.

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Zhao, K., Wang, Y. & Feng, N. Preparation of Al-Ti Master Alloy by Electrochemical Recovery of Titanium-Reducing Slag in Molten Salts. JOM 70, 758–763 (2018). https://doi.org/10.1007/s11837-018-2785-4

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  • DOI: https://doi.org/10.1007/s11837-018-2785-4

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