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Recycling of White Aluminium Dross: Production of Potash Alum

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Abstract

Aluminium dross, an industrial by-product generated in large quantities, is fairly rich in aluminium content. Even though there are means of recycling (pyrometallurgical and hydrometallurgical routes), still a large amount of aluminium dross is landfilled. This research article emphasizes on recycling of aluminium dross by the production of potash alum. Powdered aluminium dross is allowed to react with potassium hydroxide, followed in sequence by filtration, slow addition of sulphuric acid coupled with constant stirring of the solution, heating the solution and cooling it in the cold water bath to produce potash alum. The crystals of potash alum are formed in the solution after a few hours. Analysis of the product potash alum, parent liquor and the residual liquor shows that nearly 89.2% of aluminium present in the parent liquor is successfully transferred into the product potash alum crystals. Potash alum finds its applications in wastewater treatment plants, pharmaceutical cosmetic industries and leather tanning units.

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Acknowledgements

The authors express their deep reverence to the Head, Department of Metallurgical Engineering, IIT (BHU), for providing the facilities essential for conducting the experiments. Also, the authors are thankful to Mr. Amitabh Deva, MD, Deva Metal Powders Pvt., Ltd., for providing aluminium dross. Acknowledgement is extended to Dr. Bratindranath Mukherjee, Assistant Professor, IIT (BHU), Mr. Seby Varghese and technical staff of Extractive Metallurgy Division, Department of Metallurgical Engineering, Indian Institute of Technology, Banaras Hindu University.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, National Institute of Technology, Raipur, 492010, India

    Arunabh Meshram

  2. Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, India

    Divyansh Gautam & Kamalesh Kumar Singh

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  1. Arunabh Meshram
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  2. Divyansh Gautam
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Correspondence to Arunabh Meshram.

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Meshram, A., Gautam, D. & Singh, K.K. Recycling of White Aluminium Dross: Production of Potash Alum. Trans Indian Inst Met 73, 1239–1248 (2020). https://doi.org/10.1007/s12666-020-01973-1

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