상동중석광산 광미에 함유된 중금속의 수직분포도 조사

The objective of this study is to investigate the vertical variation of heavy metals in tailings from the Sangdong W mine. Tailings samples were taken at 6 drilling sites with 50cm intervals up to 21meters in depth and dried at room temperature. The pH value, loss-on-ignition and water contents were measured. In addition, chemical compositions of the samples were determined by AAS after 0.1N HC1 leaching and ICP-AES after aqua regia leaching. The pH values were in the range of 7.2 to 8.5 due to chemical reactions of carbonate minerals. The ranges of heavy metals (mg/kg) extracted by 0.1N HC1 were from 0.17 to 0.93 for Cd, 0.04 to 4.39 for Cu, 0.03 to 10.9 for Pb and 0.06 to 14.1 for Zn and those extracted by aqua regia were 3.10~10.5, 23.61 ~251, 63.7~337 and 42.6~134 for Cd, Cu, Pb and Zn, respectively. Generally, the metal concentrations in tailings do not change with depth, with they have a tendency to decrease with depth in some case.