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Removal of Inclusions from Molten Aluminum by Supergravity Filtration

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Abstract

A new approach to removing inclusions from aluminum melt by supergravity filtration was investigated. The molten aluminum containing MgAl2O4 spinel and coarse Al3Ti particles was isothermally filtered with different gravity coefficients, different filtering times, and various filtering temperatures under supergravity field. When the gravity coefficient G ≥ 50, the alloy samples were divided automatically into two parts: the upper residue and the lower filtered aluminum. All inclusions (MgAl2O4 and Al3Ti particles) were nearly intercepted in the upper residue by filter felt with average pore size of 44.78 μm. The removal efficiencies of oxide inclusions and Al3Ti particles exceeded 98 and 90 pct, respectively, at G ≥ 50, t = 2 minutes, T = 973 K (700 °C). Besides, the yield of purified aluminum was up to 92.1 pct at G = 600, t = 2 minutes, and T = 973 K (700 °C). The calculations of centrifugal pressure indicated that supergravity filtration could effectively overcome the pressure drop without meeting the rigorous requirement of height of molten metal, especially for using the fine-pore filter medium. Moreover, cake-mode filtration was the major mechanism of supergravity filtration of molten metal in this work.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (Grant Nos. 51234001 and 51274269). The authors are grateful to the State Key Laboratory of Advanced Metallurgy (University of Science and Technology Beijing) for the use of their supergravity apparatus. Sincere gratitude is also due to Professor Zhancheng Guo and Zhenya Zhang for their help and support.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, 100083, Beijing, China

    Gaoyang Song (Ph.D. Candidate), Bo Song (Professor), Zhanbing Yang (Associate Professor), Yuhou Yang (Ph.D. Candidate) & Jing Zhang (Ph.D. Candidate)

  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, 100083, Beijing, China

    Gaoyang Song (Ph.D. Candidate), Bo Song (Professor), Zhanbing Yang (Associate Professor), Yuhou Yang (Ph.D. Candidate) & Jing Zhang (Ph.D. Candidate)

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  1. Gaoyang Song
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  2. Bo Song
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  3. Zhanbing Yang
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  4. Yuhou Yang
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  5. Jing Zhang
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Correspondence to Bo Song.

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Manuscript submitted April 25, 2016.

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Song, G., Song, B., Yang, Z. et al. Removal of Inclusions from Molten Aluminum by Supergravity Filtration. Metall Mater Trans B 47, 3435–3445 (2016). https://doi.org/10.1007/s11663-016-0775-x

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