廢電子스크랩에서 Thiobacillus ferrooxidans를 이용한 Du, Al, Zn, Ni, Co, Sn 및 Pb의 浸出
Biological Leaching of Cu, Al, Zn, Ni, Co, Sn and Pb from Waste Electronic Scrap using Thiobacillus Ferrooxidans
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초록
폐전자스크랩으로부터 미생물 침출법에 의해 유가금속을 회수하기 위한 기초 연구로 Thiobacillus ferrooxidans를 이용하여 Cu, Zn, Al, Co, Ni, Sn 및 Pb의 침출 거동을 조사하였다. 예비실험으로 각 금속의 침출 거동을 조사하기 위해 먼저 폐전자스크랩 대신 각 금속분말을 이용하여 침출 실험을 실시하였는데, 금속분말의 양이 증가함에 따라 침출율을 감소하는 경향을 보였으며 각각의 금속분말의 농도가 5g/L이하에서 Cu, Co 및 Zn의 경우 85%이상의 침출율을 나타내었다. 한편 폐전자스크랩을 이용한 침출실험 결과 고액농도가 100g/L에서 Cu, Co의 경우는 90%이상의 침출율을 보이고 있으나 Al, Zn 및 Ni의 경우는 40%이하의 침출율을 나타내었다. Pb의 경우는 PbSO4형태로 Sn의 경우는 SnO 형태로 침전되어 침출액중으로는 거의 용출되지 않았다.
Abstract
In order to recover valuable metals from the waste electronic scrap, bioleaching of Cu, Zn, Al, Co, Ni, Sn and Pb was carried out using Thiobacillus ferrooxidans as a leaching microorganism in a shaking flask. In a preliminary study, to obtain the data on the leaching of Cu, Zn, Al, Co and Ni, the metal leaching was accomplished using metal powders instead of electronic scrap. The leaching percentage of Cu, Zn, Co, Al and Ni powders was reduced with the increase of metal powder concentration in solution. Below the metal concentration of 5.0g/L, more than 85% of Cu, Co and Zn powders was leached out. At the electronic scrap concentration of 100g/L, Thiobacillus ferrooxidans were able to leach more than 90% of the available Cu and Co while Al, Zn and Ni were able to leach less than 40%. Pb and Sn were not detected in the leachate. Pb was precipitated as PbSO4, whereas Sn precipitated probably as SnO.
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