Feasibility of aluminum recovery and MgAl<sub>2</sub>O<sub>4</sub> spinel synthesis from secondary aluminum dross

Yong Zhang; Zhao-hui Guo; Zi-yu Han; Xi-yuan Xiao; Chi Peng

doi:10.1007/s12613-019-1739-3

Volume 26 Issue 3

Mar. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(3): 309-318

Yong Zhang, Zhao-hui Guo, Zi-yu Han, Xi-yuan Xiao, and Chi Peng, Feasibility of aluminum recovery and MgAl₂O₄ spinel synthesis from secondary aluminum dross, Int. J. Miner. Metall. Mater., 26(2019), No. 3, pp. 309-318. https://doi.org/10.1007/s12613-019-1739-3

Cite this article as:

Yong Zhang, Zhao-hui Guo, Zi-yu Han, Xi-yuan Xiao, and Chi Peng, Feasibility of aluminum recovery and MgAl2O4 spinel synthesis from secondary aluminum dross, Int. J. Miner. Metall. Mater., 26(2019), No. 3, pp. 309-318. https://doi.org/10.1007/s12613-019-1739-3

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Research Article

Feasibility of aluminum recovery and MgAl₂O₄ spinel synthesis from secondary aluminum dross

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Corresponding author:
Zhao-hui Guo E-mail: zhguo@csu.edu.cn
Received: 12 June 2018; Revised: 9 October 2018; Accepted: 25 October 2018

Abstract

Abstract

The feasibility of aluminum recovery from secondary aluminum dross by extraction with NaOH solution and the subsequent synthesis of MgAl₂O₄ spinel by sintering the extracted slag were studied. The extraction percentage of soluble aluminum from the dross reached 80% at a temperature of 353 K, liquid-to-solid ratio of 12 mL·g^-1, stirring speed of 300 r·min^-1, and an extraction time of 15 min; the hydrolysis percentage of AlN reached 40% with an extraction time of 30 min. The activation energies of the soluble aluminum and AlN extracted from the dross were 7.15 and 8.98 kJ·mol^-1, respectively, indicating that their kinetics were controlled by outer diffusion without a product layer. The extracted slag was sintered in the temperature range 1373-1773 K; MgAl₂O₄ spinel with a compressive strength as high as 69.4 MPa was produced in the sample sintered at 1673 K for 3 h. This value exceeds the threshold (40 MPa) prescribed by the National Standard for the Magnesia and Magnesia-alumina Refractory Bricks of China (GB/T 2275-2007). These results establish the effectiveness of aluminum recovery from secondary aluminum dross and subsequent MgAl₂O₄ spinel synthesis.
- secondary aluminum dross;
- reuse;
- extraction;
- sintering;
- magnesium aluminate spinel

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