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2021 Vol.26, Issue 2 Preview Page
Feasibility of Chemical Washing and Froth-flotation Separation Processes for the Remediation of Natural Origin Fluorine-enriched Soil

자연기원 불소축적토양 정화를 위한 화학적 세척 및 부유선별 공법의 적용성 평가

Jeonghwan Cho1
,
Dong-Jun Baek1
,
Moon Young Jung2
,
Jinsung An12*
조 정환1
,
백 동준1
,
정 문영2
,
안 진성12*
1Department of Environment Safety System Engineering, Semyung University, 65 Semyung-ro, Jecheon-si 27136, Korea
2Department of Biological & Environmental Engineering, Semyung University, 65 Semyung-ro, Jecheon-si 27136, Korea
1세명대학교 환경안전시스템공학과
2세명대학교 바이오환경공학과
*Corresponding Author
30 April 2021. pp. 28-34
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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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Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 26
  • No :2
  • Pages :28-34
  • Received Date : 2021-04-16
  • Revised Date : 2021-04-16
  • Accepted Date : 2021-04-20
  • DOI :https://doi.org/10.7857/JSGE.2021.26.2.028
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