The Properties and Remediation Technologies of Contaminated Soil in the Vicinity of Daebong Mine

Jay Hyun  Park; Ju Hyun  Park; Su Chan  Yang; Jang Nam  Kim; Seung Ho  Yu; Moon Young  Jung

doi:10.12972/ksmer.2017.54.6.637

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2017 Vol.54, Issue 6 Preview Page Next Page

Research Paper

The Properties and Remediation Technologies of Contaminated Soil in the Vicinity of Daebong Mine 대봉광산 주변지역 오염토양의 특성 및 정화기술

31 December 2017. pp. 637-645

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Abstract

As soil particle in the vicinity of Daebong mine became finer, concentration of heavy metals increased, especially arsenic(As) and lead(Pb) excelling worrisome level of 1st area in Korea. As and Pb were concentrated in less than 150 μm of particle size. Among metal compounds found by sequential extraction, the residual phase of As and Pb were about 50% and 20%, respectively. The minerals (lavendulan containing As, lanarkite containing Pb and guitermanite containing As and Pb) were identified though XRD. As a result of (-150 μm) soil purification experiments, the removal efficiency of As and Pb only using soil washing were 23% and 50%, respectively. The removal efficiency of As and Pb only by reverse flotation were 38% and 43%, each. However, when soil washing after reverse flotation, the cumulative removal efficiency of As and Pb were maximum 56% and 75%, respectively. Thus, in the combination of reverse flotation and soil washing, soil contaminated with metals could be remediated to meet the worrisome level of 1st area.

Keywords

Particle size distribution

Heavy metals

Sequential extraction

Soil washing

Reverse flotation

대봉광산 주변 A지역의 토양에 대한 입도분포도 및 중금속 함량분석 결과, 토양입자가 미립일수록 중금속 함량이 증가하여 비소와 납은 1지역 토양오염 우려기준을 초과하고 있다. 특히, 150 μm 이하의 입도군 (무게분율 40%)에 비소와 납이 농집되어 있었다. 연속추출법으로 파악한 비소와 납의 존재형태 가운데, 토양세척으로 추출 제 거하기 어려운 잔류형태는 각각 50%와 20% 정도이었다. XRD분석을 통해 비소가 포함된 라벤듈란(NaCaCu5(AsO4)4 Cl · 5H2O), 납이 포함된 라나카이트(Pb2(SO4)O) 그리고 납과 비소가 포함된 기터마나이트 (Pb3As2S6)의 광물이 확인 되었다. 150 μm 이하 토양(As함량 50 mg/kg, Pb함량 698 mg/kg)에 대한 정화실험 결과, 비소와 납의 제거율은 토양세 척만으로는 각각 23%와 50% 그리고 역부선만으로는 각각 38%와 43%이었다. 그러나 토양세척 후 역부선에 의한 누 적 비소 제거율은 최대 56% 그리고 누적 납 제거율은 최대 75%이었다. 따라서 역부선과 토양세척을 병행하여 수행할 경우 대봉광산 주변지역의 중금속 오염토양을 1지역 우려기준 이하로 정화시킬 수 있었다.

키워드

입도분포도

중금속

연속추출법

토양세척

역부선

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Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 54
No :6
Pages :637-645
Received Date : 2016-11-27
Revised Date : 2016-12-20
Accepted Date : 2017-12-22
DOI :https://doi.org/10.12972/ksmer.2017.54.6.637

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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