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Experimental Study on Denitrification of Black Aluminum Dross

  • Recovery, Sorting, and Processing of Secondary Aluminum
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Abstract

A novel process for denitrification of black aluminum dross has been studied. The effects of the baking temperature, reagent addition ratio, and holding time on the denitrification ratio of aluminum dross were studied. X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) with energy-dispersive spectrometry (EDS), x-ray fluorescence (XRF), and nitrogen element analysis were used to evaluate the aluminum dross before and after baking. Aluminum nitride in aluminum dross could be removed effectively by baking a mixture of the aluminum dross with a reagent. A satisfactory denitrification ratio was obtained when applying a baking temperature of 890°C to 920°C, reactant additive dose of 30 wt.% to 40 wt.%, and holding time of 2 h to 3 h, reaching a maximum value of 98.13%. During the baking process, AlN reacted with O2 in air to form Al2O3 and N2, CaCO3 in carbonates reacted with fluorides and changed into CaF2, and Na2CO3 in carbonates reacted with Al2O3 and SiO2 to form Na1.95(Al1.95Si0.05O4), called zeolite, a compound with cellular structure. This denitrification process is environmentally friendly and could accelerate reutilization of aluminum dross.

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Acknowledgements

The authors acknowledge the Department of Material Science and Engineering at Zhengzhou University for supporting this work. This research was supported by Guangxi Branch of Petro China under Grant No. 20200310A and a grant from the National Key Research and Development Plan of China under Grant No. 2016YFB0301001. The authors particularly appreciate Jiang Du for his help to improve this paper.

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Authors and Affiliations

  1. School of Material Science and Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China

    Yange Li & Xiping Chen

  2. National and Local Joint Engineering Research Center for Green Mineral Metallurgy and Processing, Zhengzhou University, Zhengzhou, 450001, Henan, China

    Xiping Chen

  3. Guangxi Tiandong Petrochemical General Factory Co., LTD of CPC, Baise, 531500, Guangxi Zhuang Autonomous Region, China

    Bei Liu

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  1. Yange Li
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  2. Xiping Chen
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Correspondence to Xiping Chen.

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Li, Y., Chen, X. & Liu, B. Experimental Study on Denitrification of Black Aluminum Dross. JOM 73, 2635–2642 (2021). https://doi.org/10.1007/s11837-021-04771-2

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  • DOI: https://doi.org/10.1007/s11837-021-04771-2

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