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

Tadas Dambrauskas, Kestutis Baltakys, Agne Grineviciene and Valdas Rudelis
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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

Sustainability, 2021, vol. 13, issue 3, 1-17

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.

Keywords: fluorine ions; silica gel waste; leaching; hydroxide additives (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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