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Rare Metal Technology 2019 pp 145–159Cite as

Nepheline Syenite—An Alternative Source for Potassium and Aluminium

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Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

An integrated approach has been made to extract potassium and aluminium from a silicate mineral, i.e. nepheline syenite with 5.4% K2O, 19.9% Al2O3, 55.5% SiO2. Chloridising-roasting experiments were carried using CaCl2 at 900 °C for 1 h and water leaching at ambient temperature for 1 h. The leach liquor contains impurities like Ca and Na; hence, selective extraction of potassium was carried out through precipitation using perchloric acid at freezing temperatures. XRD data of the final KCl product obtained after decomposition of KClO4 indicated cubical crystal system and was found to be 99.5% pure. In the second stage, leaching of the residue was carried out with HCl, H2SO4 and H2SiF6. For selective aluminium recovery , sulphuric acid was found to be the better leachant. A 23 full factorial design with time, temperature and acid concentration was used. Finally, aluminium sulphate crystals were produced from the leach liquor after removing iron through pH adjustment.

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Acknowledgements

The authors are thankful to the Director, CSIR-IMMT Bhubaneswar for his kind permission to publish this work. One of the authors (JS) expresses her gratitude to CSIR for providing the fellowship under XII plan period projects. The authors also wish to gratefully acknowledge the assistance rendered by Mr. Pravat K. Behera for XRD studies.

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Authors and Affiliations

  1. Hydro and Electrometallurgy, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, 751013, India

    Jayashree Samantray, Barsha Dash & Malay K. Ghosh

  2. School of Minerals, Metallurgical and Materials Engineering, Indian Institute of Technology Bhubaneswar, Arugul, 752050, India

    Amit Anand

  3. CSST, School of Chemistry, Sambalpur University, Jyoti Vihar, Sambalpur, 768019, India

    Jayashree Samantray & Ajay K. Behera

Authors
  1. Jayashree Samantray
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  2. Amit Anand
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  3. Barsha Dash
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  4. Malay K. Ghosh
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  5. Ajay K. Behera
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Corresponding author

Correspondence to Malay K. Ghosh .

Editor information

Editors and Affiliations

  1. University of Toronto, Toronto, ON, Canada

    Gisele Azimi

  2. The Pennsylvania State University, University Park, PA, USA

    Hojong Kim

  3. University of Saskatchewan, Saskatoon, SK, Canada

    Shafiq Alam

  4. University of Tokyo, Tokyo, Japan

    Takanari Ouchi

  5. IND LLC, South Jordan, UT, USA

    Neale R. Neelameggham

  6. University of Ilorin, Ilorin, Nigeria

    Alafara Abdullahi Baba

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© 2019 The Minerals, Metals & Materials Society

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Samantray, J., Anand, A., Dash, B., Ghosh, M.K., Behera, A.K. (2019). Nepheline Syenite—An Alternative Source for Potassium and Aluminium. In: Azimi, G., Kim, H., Alam, S., Ouchi, T., Neelameggham, N., Baba, A. (eds) Rare Metal Technology 2019. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-05740-4_15

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