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The Effect of Various Hydroxide and Salt Additives on the Reduction of Fluoride Ion Mobility in Industrial Waste

Author

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  • Tadas Dambrauskas

    (Department of Silicate Technology, Kaunas University of Technology, LT-50270 Kaunas, Lithuania)

  • Kestutis Baltakys

    (Department of Silicate Technology, Kaunas University of Technology, LT-50270 Kaunas, Lithuania)

  • Agne Grineviciene

    (Department of Silicate Technology, Kaunas University of Technology, LT-50270 Kaunas, Lithuania)

  • Valdas Rudelis

    (JSC “Lifosa”, LT-57502 Kedainiai, Lithuania)

Abstract

In this work, the influence of various hydroxide and salt additives on the removal of F − ions from silica gel waste, which is obtained during the production of AlF 3 , was examined. The leaching of the mentioned ions from silica gel waste to the liquid medium was achieved by the application of different techniques: (1) leaching under static conditions; (2) leaching under dynamic conditions by the use of continuous liquid medium flow; and (3) leaching in cycles under dynamic conditions. It was determined that the efficiency of the fluoride removal from this waste depends on the w/s ratio, the leaching conditions, and the additives used. It was proven that it is possible to reduce the concentration of fluorine ions from 10% to <5% by changing the treatment conditions and by adding alkaline compounds. The silica gel obtained after the leaching is a promising silicon dioxide source.

Suggested Citation

  • Tadas Dambrauskas & Kestutis Baltakys & Agne Grineviciene & Valdas Rudelis, 2021. "The Effect of Various Hydroxide and Salt Additives on the Reduction of Fluoride Ion Mobility in Industrial Waste," Sustainability, MDPI, vol. 13(3), pages 1-17, February.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:3:p:1554-:d:491504
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    References listed on IDEAS

    as
    1. Valdas Rudelis & Tadas Dambrauskas & Agne Grineviciene & Kestutis Baltakys, 2019. "The Prospective Approach for the Reduction of Fluoride Ions Mobility in Industrial Waste by Creating Products of Commercial Value," Sustainability, MDPI, vol. 11(3), pages 1-18, January.
    2. Justyna Woźniak & Katarzyna Pactwa, 2018. "Overview of Polish Mining Wastes with Circular Economy Model and Its Comparison with Other Wastes," Sustainability, MDPI, vol. 10(11), pages 1-15, November.
    3. Asiphile Khanyile & Guy C. Caws & S’phumelele L. Nkomo & Ntandoyenkosi M. Mkhize, 2020. "Characterisation Study of Various Disposable Diaper Brands," Sustainability, MDPI, vol. 12(24), pages 1-18, December.
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