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

The feasibility of aluminum recovery from secondary aluminum dross by extraction with NaOH solution and the subsequent synthesis of MgAl 2 O 4 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, liqu...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2019-03, Vol.26 (3), p.309-318
Main Authors: Zhang, Yong, Guo, Zhao-hui, Han, Zi-yu, Xiao, Xi-yuan, Peng, Chi
Format: Article
Language:English
Subjects:
Aluminum
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Compressive strength
Corrosion and Coatings
Diffusion layers
Dross
Feasibility
Glass
Materials Science
Metallic Materials
Natural Materials
Sintering
Slag
Sodium hydroxide
Spinel
Surfaces and Interfaces
Synthesis
Thin Films
Tribology
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Summary:The feasibility of aluminum recovery from secondary aluminum dross by extraction with NaOH solution and the subsequent synthesis of MgAl 2 O 4 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; MgAl 2 O 4 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 MgAl 2 O 4 spinel synthesis.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-019-1739-3