폴리머 물질 첨가를 통한 중금속 오염 광미의 고형화 처리

김태풍,민경원,이현철,서의영,이원섭 江原大學校 産業技術硏究所 2010 産業技術硏究 Vol.30 No.A

Polymeric materials in addition to Portland cement and hydrated limes were used to solidify heavy metal contaminated tailings from five abandoned metal mines in Korea. Mine tailings were mixed separately with Portland cement and hydrated lime at a concentration of 20-30 wt% and 6-9 wt%, respectively and Ethylene Vinyl Acetate(EVA) powder was added to each specimen at a ratio of 2.5 and 5.0 wt% to binders. Polymer-added and polymer-free solidified forms were evaluated for their appropriateness in accordance with the suggested test methods. Regardless of addition of polymeric materials, all solidified forms satisfy the uniaxial compressive strength(UCS) requirements(0.35MPa) for land reclamation and show remarkably reduced leaching concentrations of heavy metals such as As, Cd, Cu, Pb and Zn less than the toxicity criteria of Korean standard leaching test(KSLT). The addition of polymeric materials increased the UCS of solidified forms to improve a long-term stability of solidified mine tailings.

폐금속광산 광미의 폴리머 개질 고형화/안정화 처리

김태풍,민경원,이현철 한국자원공학회 2010 한국자원공학회지 Vol.47 No.6

Polymeric materials in addition to Portland cement and hydrated limes were used to solidify and stabilize heavy metal contaminated tailings from five abandoned metal mines in Korea. Mine tailings were mixed separately with Portland cement and hydrated lime at a concentration of 20-30 wt% and 6-9 wt%, respectively and Ethylene Vinyl Acetate (EVA) powder was added to each specimen at a ratio of 2.5 and 5.0 wt% to binders. Polymer-added and polymer-free solidified/stabilized (s/s) forms were evaluated for their appropriateness in accordance with the suggested test methods. Columnar ettringites formed by pozzolanic reaction were observed in the SEM images of all portland cement solidified specimens and some hydrated lime solidified specimens. Regardless of addition of polymeric materials, all s/s forms satisfy the uniaxial compressive strength (UCS) requirements (0.35 MPa) for land reclamation and show remarkably reduced leaching concentrations of heavy metals such as As, Cd, Cu, Pb and Zn less than the toxicity criteria of Korean standard leaching test. Its increased strength and satisfactory heavy metal stabilization suggest polymer modified cement and hydrated lime solidification can be applied to abandoned mine tailings with improvement of a long term stability. 중금속을 함유한 금속광산 폐광미의 고형화 처리를 위하여 5개 폐 금속광산의 광미에 대하여 시멘트와 소석회를 이용한 고형화 처리를 실시하였다. 또한 폴리머(EVA powder) 개질을 통한 고화체의 강도증진 및 중금속 용출 저감정도를 알아보기 위해 각각의 고화체에 2.5%와 5% 비율로 EVA를 혼합하여 고화체를 제작하였다. 제작한 고화체는 양생 후 압축강도 측정, SEM 분석, 중금속 용출실험을 실시하였다. 고화체를 이용하여 SEM 분석을 실시한 결과 시멘트 고화체의 경우 모든 시료, 소석회 고화체의 경우 일부 시료에서만 막대상의 에트린자이트 형상이 관찰되었다. 압축강도 실험결과 EVA를 첨가한 고화체의 경우 첨가하지 않은 고화체보다 대체적으로 높은 강도값을 나타냈으며 모든 고화체에서 미국 EPA 폐기물매립 권고기준인 0.35 MPa를 만족하였다. 중금속 용출실험에서는 모든 시료에서 유해물질 기준 이하의 농도로 검출되었다. 강도증진과 중금속의 안정화 효과를 고려할 때, 폐금속 광미의 처리에 폴리머 개질 시멘트 및 소석회 고형화를 적용하여 장기간 안정화를 기할 수 있을 것으로 예상된다.

新保護貿易主義로 移行된 世界經濟 秩序와 開途國의 對應

金泰豊 국민대학교 1985 北岳論叢 Vol.3 No.1

미세 레이저 가공의 표면코팅 후 전해 에칭

김태풍(Tae Pung Kim),박민수(Min Soo Park) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.6

미세 레이저 가공의 표면코팅 후 전해 에칭

김태풍(T. P. Kim),박민수(M. S. Park) 한국생산제조학회 2013 한국생산제조시스템학회 학술발표대회 논문집 Vol.2013 No.4

무기고화제를 이용한 중금속 오염 광미의 안정화 처리를 위한 기초연구

민경원,김태풍,이현철,서의영 江原大學校 産業技術硏究所 2009 産業技術硏究 Vol.29 No.A

Stabilization treatment is one of processes for wastes and their components to reduce their toxicity and migration rates to surroundings. Inorganic binders such as calcium hydroxide, blast furnace slag and red mud were tested for their potential applicability to in-situ stabilization of heavy metal contaminated tailings in the abandoned metal mines. Columns(150mm dia. x 450mm length) filled with mixtures of inorganic binders and tailing from the Geumjang mine with various mixing ratios of binders to tailings, 5%, 7% and 9% were applied artificial rainfall tests for 28 days. Effluents from columns filled with calcium hydroxide and tailing showed high pH's of ~12.5 and a increasing trend of concentration in Pb and Zn with a significant decrease in permeability in terms of elapsed days. Those with burning slag and tailing showed pH's of ~8.5 and significantly low concentrations in heavy metals with a stable permeability. In case of red mud, effluents showed significantly low concentrations in heavy metals but a decreased permeability with pH's of ~10.5. Conclusively, this basic study suggests burning furnace slag be a potential stabilizer for effective treatment of heavy metal contaminated mine tailings.

소석회를 이용한 금속광산 폐광미의 고형화처리 연구

이현철,민경원,김태풍 한국자원공학회 2009 한국자원공학회지 Vol.46 No.2

중금속을 함유한 금속광산 폐광미의 고형화처리를 위하여 금장광산의 폐광미를 대상으로 소석회를 이용하여 고화시킨 후, 고화체에 대하여 압축강도를 측정하고 토양오염 및 폐기물 공정시험법에 따라 중금속 용출시험을 실시하였다. 예비실험에서 고화체 시료 모두 미국 EPA 폐기물 매립권고기준 3.5 kgf/㎠을 만족하였고, 중금속 용출실험 결과 Cd, Cu, Pb, Zn의 중금속 함량이 광미시료에 비하여 현저히 감소하여 토양오염 우려기준 이하로 나타났다. 소석회를 이용한 고형화처리의 본 실험에서는 포졸란 반응에 의한 고화체의 내구성평가를 위하여 동결융해 반복 과정을 통한 고화체 시료에 대하여 압축강도 측정과 중금속 용출시험을 실시하였다. 압축강도는 동결융해를 실시하지 않은 고화체에 비하여 강도값이 감소하였으나 3.5 kgf/㎠ 이상으로 미국 EPA 매립권고기준을 만족하였으며, 중금속 용출실험에서도 Cd, Cu, Pb, Zn 모두 토양오염 우려기준 이하의 농도를 나타냈다. 고화체에 대한 인공강우 실험에서는 유출수의 pH 범위가 7.4~9.1이고, 중금속 농도는 Cd, Cu, Pb, Zn 모두 0.05 ppm 이하로 나타났다. 결론적으로 소석회가 중금속으로 오염된 폐광미를 환경기준에 적합한 고형화처리에 효율적으로 활용될 수 있는 가능성을 보였다. Hydrated limes were applied to solidify heavy metal contaminated tailings from the Geumjang mine and the solidified tailing specimens were tested for their feasibility in accordance with the suggested test methods. In the preliminary tests for the solidified tailing specimens, all the specimens have higher uniaxial compressive strengths than 3.5 kgf/㎠, the recommended standard level for land reclamation solids by EPA (Environmental Protection Agency). From the leaching test results, concentrations of heavy metals such as Cd, Cu, Pb, and Zn were significantly decreased in the soilidified tailing specimens compared with those in raw tailing samples, and these reduced levels are lower than the environmental warning levels. In the main tests, the solidified mixtures of mine tailings and hydrated lime through pozzolanic reaction were tested for their durability against repeated freezing and thawing processes. After repeated freezing and thawing, the uniaxial compressive strengths of all the specimens decreased in comparison with those before freezing-thawing test but still higher than 3.5 kgf/㎠, and concentrations of heavy metals such as Cd, Cu, Pb, and Zn were below the warning levels. Effluents in the repetitive artificial rain tests show the pH ranges of 7.4 to 9.1 and concentrations of heavy metals such as Cd, Cu, Pb, and Zn of below 0.05 ppm. In conclusion, this study suggests that hydrated lime can be applied efficiently to solidify heavy metal contaminated mine tailings for environmental treatment.

AT 흡상전류 분배비를 활용한 교류철도 분기선로에서의 고장구간 판별기법 평가

정호성(Hosung Jung),신승권(Seungkwon Shin),김형철(Hyungchul Kim),김길동(Gildong Kim),민명환(Myung-Hwan Min),안태풍(Tae-Pung An) 대한전기학회 2020 전기학회논문지 Vol.69 No.10

This paper presents a fault zone discrimination and more accurate fault location estimation technique in the AC railway system with a branch line. For this, we propose fault zone discrimination technique using real time AT absorbing current distribution ratio and fault location estimation technique using all AT absorbing current in the branch line. And, we also consider another line"s AT absorbing current characteristics to calculate fault location. In order to evaluate the performance of the proposed technique, we test low voltage artificial forced short fault between traction line and rail in real operation branch line. As a field test result, we verify that each AT absorbing current distribution ratio index is constant to each fault zone. And, we model the AC traction power supply system with a branch line using power analysis program(PSCAD/EMTDC) to evaluate fault estimation error of the proposed technique. As a simulation result, when comparing the error of the conventional technique and the proposed technique, the conventional technique shows maximum 0.475km(4.39%) in the main line and maximum 1.727km(12.10%) in the branch line. However, the proposed technique shows under 1.0% error in all fault zone, which is satisfied within 2% of the domestic standard.

복복선 교류급전계통에서의 타선흡상전류 현상 분석

정호성(Hosung Jung),김형철(Hyungchul Kim),김주욱(Joouk Kim),김길동(Gildong Kim),안태풍(Taepoong Ahn),민명환(Myunghwan Min) 한국철도학회 2019 한국철도학회 학술발표대회논문집 Vol.2019 No.5