Optimization of Reverse Flotation for Remediation of Soil Contaminated  with Heavy Metals in the Vicinity of Gahak Mine

Sang Hyo Kim; Yong Hyeon An; Choong Hyun Lee; Young Jae Lee; Mi Jeong Park; Sang Hwan Lee; Moon Young Jung

doi:10.12972/ksmer.2015.52.6.549

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2015 Vol.52, Issue 6 Next Page

Research Paper

Optimization of Reverse Flotation for Remediation of Soil Contaminated with Heavy Metals in the Vicinity of Gahak Mine 가학광산 주변 중금속 오염토양의 정화를 위한 역부선 최적화

31 December 2015. pp. 549-558

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Abstract

The contents of heavy metals such as Cu, Pb, Zn in all samples obtained from A sites around Ghahak mine exceed the 1st-area anxiety criteria of Korean soil contamination standard. When the samples were analyzed by Tessier's sequential extraction method to determine the chemical form of heavy metal components, more than of 50% belongs to residual types. First, 3 factors and 3 levels of each factor were identified through reverse flotation on one factor at a time. Based on them, the reverse flotation designed by Box-Behnken method was carried out and optimum flotation conditions were found to be 970 g/ton of MIBC dosage, 1,210 g/ton of oleic acid dosage, and 33°C of slurry temperature. Retests of contaminated soil on the conditions show that floating yield was 22%, and the removal efficiencies of Cu, Pb and Zn were 61.2%, 61.7% and 62.6%, respectively. Consequently, the results indicate that removal efficiencies of heavy metals by reverse flotation almost agree with percent of residual fraction.

Keywords

Soil contamination

Heavy metals

Remediation

Reverse flotation

Box-Behnken

가학광산 주변 A지역 토양의 중금속(Cu, Pb, Zn) 농도는 모두 토양오염공정시험기준의 1지역 우려기준을 초과하고 있다. Tessier의 5단계 연속추출법에 의해 확인한 중금속 원소는 50% 이상이 광물입자 내에 존재하는 잔류성 형태이었다. 먼저 1회 1인자 역부선 실험을 통해 파악한 3요인(올레인산 첨가량, MIBC 첨가량, 슬러리 온도)과 3수준을 근거로 실험계획법인 Box-Behnken법으로 설계한 역부선 토양정화실험을 수행하였다. 이를 통해 도출한 최적의 역부선 조건은 올레인산 첨가량 970 g/ton, MIBC 첨가량 1,210 g/ton, 슬러리 온도 33°C이었다. 이러한 역부선 조건에서 오염토양에 대한 확인실험 결과 부유산출률은 22%, 그리고 중금속제거율은 Cu 61.2%, Pb 61.7%, Zn 62.6%이었다. 따라서 부선으로 제거 가능한 잔류성 중금속형태의 분포율과 역부선에 의한 중금속 제거율이 거의 부합함을 확인하였다.

키워드

오염토양

중금속

토양정화

역부선

박스‒벤켄법

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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 : 52
No :6
Pages :549-558
Received Date : 2015-09-22
Revised Date : 2015-11-18
Accepted Date : 2015-12-17
DOI :https://doi.org/10.12972/ksmer.2015.52.6.549

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

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