중화처리시 산화처리가 광산배수중의 Fe, Al 및 Mn 성분의 선택침전에 미친 영향
Effect of Oxidation on Selective Precipitation of Dissolved Fe, Al and Mn in Acid Mine Drainage during Neutralization
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초록
본 연구는 광산배수로부터 용존금속을 회수하는 선택적 침전공정을 개발하기 위해 수행되었다. 삼마태정 광산배수를 대상으로 중화제 및 산화제를 주입하여 pH 상승에 따른 용존 금속 회수율 및 순도에 미치는 영향을 평가하였다. 중화제만을 첨가했을 때 Al 및 Fe가 pH 4.5 부근에서 동시에 침전됨으로써 침전물의 순도가 낮았다. 과산화수소로 산화한 후 중화처리 한 결과 Fe>Al>Mn순으로 침전되었다. 이때 Fe는 pH 4.5에서 회수율이 99.2∼99.3%, Al의 경우 회수율은 pH 5.5에서 70.4∼82.2% 범위였다. 또한 Mn의 경우 pH가 8.5에서 37.8∼87.5%의 회수율을 보였다. 산화작용이 용존 Fe을 Fe3+로 산화시켜 Fe와 Al의 침전물의 고순도를 가능케 했다.
Abstract
This study was carried out to develop a selective sequential precipitation process for recovering dissolved metals from acid mine drainages (AMD). The AMD of pH 3 with high concentration of Fe, Al and Mn at the Samma-Teajung coal mine was neutralized by adding neutralizing agents and oxidant to evaluate recovery of the metals and purity of their precipitates. In the case of adding only neutralizing agents, both dissolved Al and Mn were concurrently precipitated at pH 4.5 so that caused the purity of each precipitate to be lowered. However, for neutralization preceded by oxidation of AMD, dissolved metals were removed sequentially in the order of Fe, Al and Mn. Recoveries of dissolved Fe, Al and Mn reached 99.2∼99.3% at pH 4.5, 70.4∼82.2% at pH 5.5, and 37.8∼87.5% at pH 8.5, respectively. Oxidation before neutralization increased the recovery of dissolved Fe and Al in AMD with high purity of precipitates.
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