광양 폐금광산에서 생성되는 산성광산배수와 황갈색 철수산화물의 지화학적 성분에 대한 계절적 변화 특성 (Seasonal Characteristics Variation of the Geochemical Components of Acid Mine Drainage and Yellow-colored Iron Hydroxide in the Abandoned GwangYang Gold Mine, South Korea)

서지정보

· 발행기관 : 한국자원공학회
· 수록지 정보 : 한국자원공학회지 / 46권 / 2호 / 190 ~ 206페이지
· 저자명 : 박천영, 한오형, 신대윤, 홍영의

초록

광양 폐 금광산에서 형성되는 산성광산배수와 황갈색 철수산화물에 대한 계절적 변화특성을 연구하고자 매월 산성광산배수와 황갈색 철수산화물을 채취하였다. 산성광산배수의 pH 변화는 3.02(7월)에서 3.96(2월)로 변화하였다. 산성광산배수 중에 함유되어 있는 SO4, Fe 및 As 성분들은 강우량이 가장 많은 9월에 가장 높게 나타났다. Eh-pH 관계도에서 Fe 이온 종(species)은 12개월 대부분 Fe+2 이온이 안정한 영역에 도시되고, 역시 침철석과 적철석에 대하여 대부분 과포화로 나타났다. 황갈색 철수산화물은 Fe2O3(평균=59.94 wt%), SiO2(평균=8.65 wt%), S(평균=2.58 wt%) 및 Al2O3(평균=1.67 wt%) 등으로 구성되어 있으며, Fe2O3 함량이 36.7 wt%(가장 낮은 값= 9월)에서 68.64 wt%(가장 높은 값= 12월) 범위로 나타났다. 황갈색 철수산화물에 함유되어 있는 SiO2, Al2O3, MgO, K2O, TiO2, Ba, Cr, Ni, Sc, Sr 및 Zr 등의 함량들은 월평균강우량이 가장 많은 9월에 가장 높게 나오지만 Fe 함량은 9월에 가장 낮게 나오고 있었다. 황갈색 철수산화물에 대한 XRD 분석결과 침철석과 석영이 관찰되었으며, 침철석에 해당되는 XRD peak들이 건기에 잘 발달되어 나타나지만, 우기에는 석영의 peak들이 관찰된다. 황갈색 철수산화물에 대한 IR분석에서 침철석을 판별하는 vOH, (δ-OH) 및 (γ-OH) 등의 흡수밴드들이 잘 관찰되었다. pH가 3.02(7월)인 산성광산배수에서 Thiobacillus 종(species)로 판단되는 미생물체들이 SEM 분석에서 관찰되었다. 이들 미생물체들은 막대 모습이고, 길이가 0.5 μm에서 2.55 μm이고 그리고 Gram 염색에서 음성으로 나타났다.

영어초록

The object of this study was to investigate the seasonal characteristic variations of the geochemical components of acid mine drainage and the yellow-colored iron hydroxide formed in the abandoned GwangYang gold mine. Sampling of the acid mine drainage and the yellow-colored iron hydroxide were carried out over several months in the study area. The pH value of the acid mine drainage from the dump of the waste rock varied from 3.02 (July) to 3.96 (February). In the results of this study components such as SO4, Fe and As in acid mine drainage had the highest value in September when the average amount of rainfall recorded was the highest. In the Eh-pH diagram, most of the Fe ions from 12 samples of measurement had values to plot in the stability area of the ferrous iron, and these were also supersaturated with respect to goethite and hematite. The composition of the yellow-colored iron hydroxide consisted mainly of Fe2O3 (average=59.94 wt%), SiO2 (average=8.65 wt%) and S (average=2.58 wt%). The content of Fe2O3 ranged from 36.7 wt% (the lowest in September) to 68.64 wt% (the highest in December). The contents of SiO2, Al2O3, MgO, K2O, TiO2, Ba, Cr, Ni, Sc, Sr and Zr in the yellow-colored iron hydroxide were measured to have the highest value in September but the content of Fe2O3 was recorded to have the lowest value in the same month. Goethite and quartz were identified in yellow-colored iron hydroxide by x-ray powder diffraction. Goethite peaks of the XRD in the yellow-colored hydroxide were well developed in the dry season, but quartz peaks were mainly found in rainy season. In the IR analysis, the OH-stretching vibration, the γ-OH bending vibration and the δ-OH-bending vibration of diagnostic absorption bands for goethite were well found in the yellow-colored iron hydroxide. In the SEM analysis, Thiobacillus species were identified in acid mine drainage of 3.02 pH value (July), those microbes were rod shaped, and their length ranged from 0.5 μm to 2.55 μm and were a Gram negative strain.

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