Recovery of sodium from alumina-extracted fly ash using concentrated sodium carbonate solution

Wang Z.; Zheng S.; Ma S.; Ding J.; Wang X.

doi:10.2298/JMMB180309010W

Journal of Mining and Metallurgy. Section B: Metallurgy (Jan 2018)

Recovery of sodium from alumina-extracted fly ash using concentrated sodium carbonate solution

Wang Z.,
Zheng S.,
Ma S.,
Ding J.,
Wang X.

Affiliations

Wang Z.: National Engineering Laboratory for Hydrometallurgy Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, PR China + University of Chinese Academy of Science
Zheng S.: Institute of Process Engineering, Chinese Academy of Sciences, Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgy Cleaner Production Technology, Beijing, PR China
Ma S.: Institute of Process Engineering, Chinese Academy of Sciences, Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgy Cleaner Production Technology, Beijing, PR China
Ding J.: Institute of Process Engineering, Chinese Academy of Sciences, Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgy Cleaner Production Technology, Beijing, PR China
Wang X.: Institute of Process Engineering, Chinese Academy of Sciences, Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgy Cleaner Production Technology, Beijing, PR China

DOI: https://doi.org/10.2298/JMMB180309010W
Journal volume & issue: Vol. 54, no. 2
pp. 225 – 232

Abstract

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A novel method for the recovery of sodium from alumina-extracted fly ash (AEFA) using concentrated Na2CO3 solution is presented. Sodium was efficiently extracted from AEFA, which was mainly composed of NaCaHSiO4. The factors influencing the process were systematically investigated, and the optimal conditions were determined to be: reaction temperature = 180°C, Na2CO3 concentration = 170 g/L, liquid-to-solid ratio = 10 mL/g, and reaction time = 2 h. Under optimal conditions, a low Na2O content of 1.02 wt% of the products, with Na2O extraction rate of 93.79% was achieved. The results indicated that this process was more effective than the recovery of sodium from AEFA using a dilute NaOH solution. Furthermore, this process avoided the production of a dilute NaOH solution, therefore lowering the energy consumption during the concentration and recycling of sodium, when compared with the NaOH-based route. Therefore, the recovery of sodium from AEFA using concentrated Na2CO3 solution is more suitable for use in industrial applications.

Published in Journal of Mining and Metallurgy. Section B: Metallurgy

ISSN: 1450-5339 (Print); 2217-7175 (Online)
Publisher: Technical Faculty, Bor
Country of publisher: Serbia
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.doiserbia.nb.rs/journal.aspx?issn=1450-5339

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