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http://dx.doi.org/10.7857/JSGE.2021.26.2.028

Feasibility of Chemical Washing and Froth-flotation Separation Processes for the Remediation of Natural Origin Fluorine-enriched Soil  

Cho, Jeonghwan (Department of Environment Safety System Engineering, Semyung University)
Baek, Dong-Jun (Department of Environment Safety System Engineering, Semyung University)
Jung, Moon Young (Department of Biological & Environmental Engineering, Semyung University)
An, Jinsung (Department of Environment Safety System Engineering, Semyung University)
Publication Information
Journal of Soil and Groundwater Environment / v.26, no.2, 2021 , pp. 28-34 More about this Journal
Abstract
This study evaluated the feasibility of chemical washing and froth-flotation separation methods for remediating naturally occurring fluorine (F)-enriched soil due to mica weathering. The F concentration of the target soil was analyzed to be 472 ± 40.4 mg/kg. In the chemical washing experiment performed with HCl concentrations of 1, 2, and 2.5 M to remediate the soil enriched with F, only a maximum removal efficiency of up to less than 1% was achieved. As a result of sequential extraction, the residual fraction of F amounted to 99.6%, indicating that most of the F originating from weathered mica minerals was present in the soil in a chemically stable form. Thus, the chemical washing method was found to be infeasible. The froth-flotation separation was adopted by varying the collector amount, the particle size of the sample, and the pulp concentration. Consequently, a maximum removal efficiency of 62.4% (F concentration after remediation = 248 ± 29 mg/kg) was achieved, satisfying the Korean worrisome level of soil contamination (400 mg/kg). In this study, it was demonstrated that physical separation techniques, such as flotation, can be an effective measure for the active remediation (concentration reduction) of soil with accumulated F originating from F-containing mica weathering.
Keywords
Natural sources; Fluorine-enriched soil; Soil remediation; Froth-flotation separation; Chemical washing;
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