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2025 Vol.34, Issue 5 Preview Page

Research Paper

Assessment of Long-Term Leaching Characteristics of Mine Backfill Materials

광산용 채움재의 장기간 용출 특성 평가

Junbeum Lee1
,
Kyeongmin Kim2
,
Chaehyeon Lee2
,
Min Kyeong Lee2
,
Junghyun Lim2
,
Eunhyea Chung23*
이 준범1
,
김 경민2
,
이 채현2
,
이 민경2
,
임 정현2
,
정 은혜23*
1BK21 SNU Division of Integrated Graduate Education for Next-Generation Energy, Seoul National University
2Department of Energy Systems Engineering, Seoul National University
3Research Institute of Energy and Resources, Seoul National University
1서울대학교 차세대 에너지 통합형 인력양성 사업단
2서울대학교 에너지시스템공학부
3서울대학교 에너지자원신기술 연구소
*Corresponding Author
31 October 2025. pp. 60-70
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Abstract

This study aims to evaluate the environmental stability of a backfill material composed of fly ash, low-grade limestone, and green cement by conducting short- and long-term leaching assessments. The short-term leaching tests were based on the Korean Standard Leaching Test(KSLT) and the Toxicity Characteristic Leaching Procedure(TCLP) protocols, and all measured parameters satisfied the leaching standards of the Waste Management Regulation. Although the total Cr and As concentrations exceeded the drinking water quality standards in some samples, this does not indicate regulatory non-compliance for ground backfill, which was assessed against the KSLT/TCLP leaching limits that were met under the test conditions. For long-term behavior prediction, geochemical modeling was performed using pH-Redox-Equilibrium in C programming language(PHREEQC). The leaching concentrations of the major heavy metals(Pb, Cd, Cu, and Zn) were predicted to be below 0.010 mg/L, indicating stable concentrations under highly alkaline conditions. This study provides data supporting the long-term application potential of mine backfill materials that utilize industrial byproducts.

Keywords
Mine backfill
Leaching test
Environmental stability
Geochemical modeling
Heavy metal leaching

본 연구는 비산재, 저품위 석회석, 그린시멘트를 혼합한 채움재의 환경 안정성을 단기 및 장기 용출 특성 분석을 통해 평가하였다. 단기 용출시험은 Korean Standard Leaching Test(KSLT) 및 Toxicity Characteristic Leaching Procedure(TCLP) 기준에 따라 수행되었으며, 모든 항목이 폐기물관리법상 용출허용기준을 만족하였다. 일부 시료에서 총 Cr과 As가 먹는물 수질기준을 일시적으로 초과하였으나, 이는 음용수 대상이 아닌 지반 채움재로서의 적용을 고려할 때 위해성이 제한적일 수 있다. 장기 거동 예측을 위해 pH-Redox-Equilibrium in C programming language(PHREEQC) 기반 지화학 모델링을 수행한 결과, 주요 중금속(Pb, Cd, Cu, Zn)의 침출 농도는 모두 0.010 mg/L 미만으로 나타났으며, 고알칼리 조건에서 안정적인 농도 유지가 확인되었다. 본 연구는 산업 부산물을 활용한 광산 채움재의 장기간 적용 가능성을 뒷받침하는 자료로 활용될 수 있다.

키워드
채움재
용출시험
환경 안정성
지화학 모델링
중금속 용출
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Information
  • Publisher :The Korean Institute of Resources Recycling
  • Publisher(Ko) :한국자원리싸이클링학회
  • Journal Title :Resources Recycling
  • Journal Title(Ko) :자원리싸이클링
  • Volume : 34
  • No :5
  • Pages :60-70
  • Received Date : 2025-07-28
  • Revised Date : 2025-08-22
  • Accepted Date : 2025-09-05
  • DOI :https://doi.org/10.7844/kirr.2025.34.5.60
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